CN113534351B - A column vector optical fiber isolator and optical equipment - Google Patents
A column vector optical fiber isolator and optical equipment Download PDFInfo
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- CN113534351B CN113534351B CN202111089965.9A CN202111089965A CN113534351B CN 113534351 B CN113534351 B CN 113534351B CN 202111089965 A CN202111089965 A CN 202111089965A CN 113534351 B CN113534351 B CN 113534351B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 105
- 239000013307 optical fiber Substances 0.000 title claims abstract description 58
- 230000010287 polarization Effects 0.000 claims abstract description 151
- 239000000835 fiber Substances 0.000 claims abstract description 33
- 238000010586 diagram Methods 0.000 description 15
- 238000009826 distribution Methods 0.000 description 5
- 238000002955 isolation Methods 0.000 description 4
- 230000001902 propagating effect Effects 0.000 description 4
- 230000001419 dependent effect Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/27—Optical coupling means with polarisation selective and adjusting means
- G02B6/2706—Optical coupling means with polarisation selective and adjusting means as bulk elements, i.e. free space arrangements external to a light guide, e.g. polarising beam splitters
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/27—Optical coupling means with polarisation selective and adjusting means
- G02B6/2706—Optical coupling means with polarisation selective and adjusting means as bulk elements, i.e. free space arrangements external to a light guide, e.g. polarising beam splitters
- G02B6/2713—Optical coupling means with polarisation selective and adjusting means as bulk elements, i.e. free space arrangements external to a light guide, e.g. polarising beam splitters cascade of polarisation selective or adjusting operations
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/27—Optical coupling means with polarisation selective and adjusting means
- G02B6/2746—Optical coupling means with polarisation selective and adjusting means comprising non-reciprocal devices, e.g. isolators, FRM, circulators, quasi-isolators
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/27—Optical coupling means with polarisation selective and adjusting means
- G02B6/2753—Optical coupling means with polarisation selective and adjusting means characterised by their function or use, i.e. of the complete device
- G02B6/2773—Polarisation splitting or combining
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Abstract
本发明提供一种柱矢量光纤隔离器及光学设备，涉及光学设备领域，柱矢量光纤隔离器包括第一偏振分束器、第二偏振分束器、第一光学部件和第二光学部件，第二偏振分束器与第一偏振分束器间隔设置，第二偏振分束器与所述第一偏振分束器关于设定轴对称。第一光学部件设置于第一偏振分束器与第二偏振分束器之间，第一光学部件适于使穿过第一光学部件的入射光的偏振方向顺时针旋转第一角度。第二光学部件适于使沿正向穿过第二光学部件的入射光的偏振方向逆时针旋转第二角度，并使沿反向穿过第二光学部件的入射光的偏振方向顺时针旋转第三角度。柱矢量光纤隔离器对空间均匀偏振光束与空间非均匀偏振光束均适用，具有结构简单和可靠性高的优点。
The invention provides a cylindrical vector optical fiber isolator and optical equipment, and relates to the field of optical equipment. The cylindrical vector optical fiber isolator includes a first polarization beam splitter, a second polarization beam splitter, a first optical component and a second optical component. The second polarizing beam splitter is spaced apart from the first polarizing beam splitter, and the second polarizing beam splitter and the first polarizing beam splitter are symmetric about the set axis. The first optical component is disposed between the first polarizing beam splitter and the second polarizing beam splitter, and the first optical component is adapted to rotate the polarization direction of the incident light passing through the first optical component clockwise by a first angle. The second optical component is adapted to rotate the polarization direction of incident light passing through the second optical component in the forward direction by a second angle counterclockwise, and rotate the polarization direction of incident light passing through the second optical component in the reverse direction by a second angle Three angles. The cylindrical vector fiber isolator is suitable for both spatially uniformly polarized light beams and spatially non-uniformly polarized light beams, and has the advantages of simple structure and high reliability.
Description
Technical Field
The invention relates to the field of optical equipment, in particular to a column vector optical fiber isolator and optical equipment.
Background
The electric vector plays a dominant role in the interaction of light with matter, and thus the direction of the electric vector is usually referred to as the polarization direction of the light beam. As one of the important features of light, polarization and the interaction of light with matter are the basis of the design of many optical devices and fiber amplifiers. Most of the past studies on light have been around a spatially uniform light beam, such as linearly polarized light, circularly polarized light, elliptically polarized light, etc., which has a uniform polarization direction at any position in the cross section of the propagation direction, i.e., the polarization state of the light beam is uniformly distributed in the transverse section of the light beam. Unlike the above-mentioned uniformly polarized light, the Cylindrical Vector Beam (CVB) has a non-uniform distribution of the polarization directions in a cross section perpendicular to the propagation direction and a central symmetrical form with respect to the center of the spot, and a polarization singular point exists at the center of the Cylindrical Vector Beam unlike the gaussian-type intensity distribution of the conventional Beam.
The optical fiber isolator is a passive optical device which only allows unidirectional light to pass through, and the working principle of the optical fiber isolator is based on the non-reciprocity of Faraday rotation, and the forward transmission light loss and the reverse transmission light loss are finally caused by operations such as polarization, polarization detection and the like. It is widely used in the fields of laser technology and optical communication. When the optical fiber isolator is used, the polarization direction of the light beam can be rotated no matter the polarization-dependent isolator or the polarization-independent isolator, the rotation has no influence on the traditional spatially uniformly polarized light beam, and for spatially non-uniformly polarized light beams such as cylindrical vector light (including radial polarized light and angular polarized light), when the cylindrical vector light passes through the traditional polarization-dependent optical fiber isolator, the cylindrical vector light can be changed into linearly polarized light due to the existence of the polarizer; when the column vector light passes through the conventional polarization-independent fiber isolator, the horizontal polarized light component of the column vector light is rotated into the vertical polarized light component, and the vertical polarized light component is rotated into the horizontal polarized light component. Therefore, the polarization state of the cylindrical vector light can be damaged in both the polarization-dependent fiber isolator and the polarization-independent fiber isolator. Therefore, the transmitted fiber isolator is not suitable for the polarized light beam which is not uniformly distributed in space.
In the optical fiber amplifier, an optical fiber isolator is an indispensable device, however, in the column vector optical fiber amplifier, the traditional optical fiber isolator is not applicable, so that a space device is often introduced into the column vector optical fiber amplifier, and due to the insertion of the space device, the system reliability is poor, and the popularization of the column vector optical fiber amplifier in practical application is seriously limited.
Disclosure of Invention
The invention provides a column vector optical fiber isolator which is used for solving the problem that the existing optical fiber isolator cannot be suitable for column vector light and is poor in reliability.
The embodiment of the invention provides a column vector optical fiber isolator, which comprises:
a first polarizing beam splitter;
the second polarization beam splitter is arranged at an interval with the first polarization beam splitter and is symmetrical to the first polarization beam splitter about a set axis;
a first optical member disposed between the first and second polarization beam splitters, the first optical member being adapted to rotate a polarization direction of incident light passing through the first optical member clockwise by a first angle;
a second optical member disposed between the first optical member and the second polarization beam splitter, the second optical member being adapted to rotate a polarization direction of incident light passing through the second optical member in a forward direction by a second angle counterclockwise and to rotate a polarization direction of incident light passing through the second optical member in a reverse direction by a third angle clockwise.
According to the column vector optical fiber isolator provided by the embodiment of the invention, the column vector optical fiber isolator further comprises a first light guide part and a second light guide part, wherein the first light guide part is connected with the first light inlet side of the first polarization beam splitter, and the second light guide part is connected with the first light inlet side of the second polarization beam splitter.
According to the column vector optical fiber isolator provided by the embodiment of the invention, the first light guide part and the second light guide part are both optical fibers.
According to the column vector optical fiber isolator provided by the embodiment of the invention, the first optical component comprises a faraday rotator, and gaps are respectively formed between the faraday rotator and the first polarization beam splitter and between the faraday rotator and the second optical component.
According to an embodiment of the present invention, there is provided a column vector optical fiber isolator, wherein the second optical component includes a half-wave plate, and a gap is formed between the half-wave plate and the second polarization beam splitter.
According to the column vector optical fiber isolator provided by the embodiment of the invention, a fourth angle is formed between the optical axis of the half-wave plate and the polarization direction of incident light.
According to the column vector optical fiber isolator provided by the embodiment of the invention, the second angle is equal to the third angle, and the second angle is twice as large as the fourth angle.
According to the column vector optical fiber isolator provided by the embodiment of the invention, the first angle is equal to the second angle.
An embodiment of the present invention further provides an optical device, where the optical device includes any one of the column vector optical fiber isolators described above.
According to an embodiment of the present invention, there is provided an optical apparatus, which is an optical fiber amplifier.
According to the column vector optical fiber isolator provided by the embodiment of the invention, the polarization direction of light is rotated through the first optical component and the second optical component; when the cylindrical vector light passes through the first optical component and the second optical component in the forward direction, the horizontally polarized light is also horizontally polarized light after passing through the first optical component and the second optical component; the vertically polarized light is also vertically polarized after passing through the first optical component and the second optical component, so that the polarization direction of the light is maintained, the polarization state in nonuniform polarization distribution in space cannot be damaged, and the vertically polarized light can be combined into a beam of light through the second polarization beam splitter, so that the loss is very low when the column vector light passes through in the forward direction. When the column vector light reversely passes through, the vertically polarized light is horizontally polarized after passing through the first optical component and the second optical component, the horizontally polarized light is vertically polarized after passing through the first optical component and the second optical component, and finally the horizontally polarized light is upwardly deflected and output through the first polarization beam splitter and is directly transmitted and output, so that the polarization state of the polarization distribution of the column vector light is destroyed, and the horizontally polarized light and the vertically polarized light cannot be combined into one beam, so that the column vector light cannot be coupled into the optical fiber for output, a large reverse loss is caused, and the isolation of the column vector light is realized. The column vector optical fiber isolator provided by the embodiment of the invention is suitable for both space uniform polarization beams and space non-uniform polarization beams, and has the advantages of simple structure and high reliability.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a column vector fiber isolator according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a half-wave plate according to an embodiment of the present invention;
FIG. 3 is a second schematic diagram illustrating the operation of a half-wave plate according to an embodiment of the present invention;
fig. 4 is a third schematic diagram of the working principle of the half-wave plate according to the embodiment of the present invention;
FIG. 5 is one of the schematic diagrams of the working principle of the column vector fiber isolator according to the embodiment of the present invention;
FIG. 6 is a second schematic diagram illustrating the working principle of the column vector fiber isolator according to the embodiment of the present invention;
FIG. 7 is a third schematic diagram illustrating the operation of a column vector fiber isolator according to an embodiment of the present invention;
fig. 8 is a fourth schematic diagram illustrating the working principle of the column vector optical fiber isolator according to the embodiment of the present invention.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. Specific meanings of the above terms in the embodiments of the present invention can be understood in specific cases by those of ordinary skill in the art.
In embodiments of the invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
The following describes a cylindrical vector optical fiber isolator and an optical apparatus according to an embodiment of the present invention with reference to fig. 1 to 8.
Fig. 1 illustrates a schematic structural diagram of a column vector fiber isolator provided in an embodiment of the present invention, and as shown in fig. 1, the column vector fiber isolator includes a first polarization beam splitter 3, a second polarization beam splitter 12, a first optical component, and a second optical component, where the second polarization beam splitter 12 is disposed at a distance from the first polarization beam splitter 3, and the second polarization beam splitter 12 is symmetric to the first polarization beam splitter 3 about a setting axis. A first optical component is arranged between the first polarizing beam splitter 3 and the second polarizing beam splitter 12, the first optical component being adapted to rotate the polarization direction of incident light passing through the first optical component clockwise by a first angle. The second optical member is disposed between the first optical member and the second polarization beam splitter 12, and is adapted to rotate the polarization direction of incident light passing through the second optical member in the forward direction by a second angle counterclockwise and rotate the polarization direction of incident light passing through the second optical member in the reverse direction by a third angle clockwise. The first polarizing beam splitter 3, the second polarizing beam splitter 12, the first optical component and the second optical component are in the same line to reduce the loss of light passing through the device.
It should be noted here that the forward direction and the reverse direction are only relative concepts, and may refer to different directions in different scenarios. For example, in fig. 1, the forward direction refers to a direction from left to right, and the reverse direction refers to a direction from right to left. The first polarization beam splitter 3 is placed in the forward direction, that is, the first light inlet side of the first polarization beam splitter 3 is located on the side of the first polarization beam splitter 3 departing from the first optical component, and the second light inlet side of the first polarization beam splitter 3 is located on the side of the first polarization beam splitter 3 facing the first optical component. When the cylindrical vector light passes through the first polarization beam splitter 3 from the forward direction (i.e. the cylindrical vector light enters the first polarization beam splitter 3 from the first light inlet side of the first polarization beam splitter 3), the cylindrical vector light is divided into two beams under the effect of the birefringence effect, namely, vertically polarized light and horizontally polarized light, wherein the vertically polarized light is directly transmitted and output from the second light inlet side of the first polarization beam splitter 3, and the horizontally polarized light is deflected downward. When the cylindrical vector light passes through the first polarization beam splitter 3 from the reverse direction (i.e. the cylindrical vector light enters the first polarization beam splitter 3 from the second light-entering side of the first polarization beam splitter 3), the horizontally polarized light is deflected upwards, and the vertically polarized light is directly transmitted and output. The setting axis is a virtual axis, is perpendicular to a connection line between the second polarization beam splitter 12 and the first polarization beam splitter 3, and is located at a central position between the second polarization beam splitter 12 and the first polarization beam splitter 3.
The second polarization beam splitter 12 and the first polarization beam splitter 3 are symmetrically disposed, that is, the first light entering side of the second polarization beam splitter 12 is located on the side of the second polarization beam splitter 12 departing from the second optical component, and the second light entering side of the second polarization beam splitter 12 is located on the side of the second polarization beam splitter 12 facing the second optical component. When the cylindrical vector light passes through the second polarization beam splitter 12 from the forward direction, the vertically polarized light is directly transmitted and output, and the horizontally polarized light is deflected upward. When the cylindrical vector light passes through the second polarization beam splitter 12 from the reverse direction, the vertically polarized light is directly transmitted and output, and the horizontally polarized light is deflected downward.
According to the column vector optical fiber isolator provided by the embodiment of the invention, the polarization direction of light is rotated through the first optical component and the second optical component; when the cylindrical vector light passes through the first optical component and the second optical component in the forward direction, the horizontally polarized light is also horizontally polarized light after passing through the first optical component and the second optical component; the vertically polarized light is also vertically polarized after passing through the first optical component and the second optical component, so that the polarization direction of the light is maintained, the polarization state which is in non-uniform polarization distribution in space is not damaged, and the vertically polarized light can be combined into a beam of light through the second polarization beam splitter 12, so that the loss is very low when the column vector light passes through in the forward direction. When the column vector light reversely passes through, the vertically polarized light is horizontally polarized after passing through the first optical component and the second optical component, the horizontally polarized light is vertically polarized after passing through the first optical component and the second optical component, and finally the horizontally polarized light is upwardly deflected and output through the first polarization beam splitter 3 and is directly transmitted and output, so that the polarization state of the polarization distribution of the column vector light is destroyed, and the horizontally polarized light and the vertically polarized light cannot be combined into one beam, so that the column vector light cannot be coupled into the optical fiber for output, a large reverse loss is caused, and the isolation of the column vector light is realized. The column vector optical fiber isolator provided by the embodiment of the invention is suitable for both the space uniform polarization light beam and the space non-uniform polarization light beam, has the advantages of simple structure and high reliability, is mature in manufacturing process, and is convenient for large-scale mass production. The column vector optical fiber isolator provided by the embodiment of the invention is suitable for working conditions under high power.
According to an embodiment of the present invention, as shown in fig. 1, the column vector fiber isolator further includes a first light guide member and a second light guide member, the first light guide member is connected to the first light incoming side of the first polarization beam splitter 3, and the second light guide member is connected to the first light incoming side of the second polarization beam splitter 12. The first light guide part and the second light guide part are both optical fibers, and the optical fibers can be any one of photonic crystal fibers, microstructure fibers, single-mode fibers, multi-mode fibers, few-mode fibers, polymer fibers, polarization maintaining fibers, multi-core fibers, circular fibers or elliptical fibers.
According to an embodiment of the present invention, as shown in fig. 1, the first optical member includes a faraday rotator 6, and gaps are formed between the faraday rotator 6 and the first polarization beam splitter 3 and the second optical member, respectively. The size of the gap between the faraday rotator 6 and the first polarization beam splitter 3 is specifically determined according to actual needs, the size of the gap between the faraday rotator 6 and the second optical component is specifically determined according to actual needs, and the faraday rotator 6 in this embodiment is used to rotate the polarization direction of light by 45 ° clockwise.
According to an embodiment of the invention, the second optical component comprises a half-wave plate 9, as shown in fig. 1, with a gap formed between the half-wave plate 9 and the second polarizing beam splitter 12. The size of the gap between the half-wave plate 9 and the second polarization beam splitter 12 is specifically determined according to actual needs.
According to an embodiment of the invention, the optical axis of the half-wave plate 9 makes a fourth angle with the polarization direction of the incident light.
According to an embodiment of the invention, the second angle is equal to the third angle, the second angle is twice the fourth angle, and the first angle is equal to the second angle. Fig. 2 illustrates one of the working principle diagrams of the half-wave plate 9 provided by the embodiment of the present invention, as shown in fig. 2, the optical axis of the half-wave plate 9 in the embodiment is rotated clockwise by 67.5 ° (viewed from left to right) compared with the optical axis of the conventional half-wave plate 9, the half-wave plate 9 is used for rotating the polarization direction of the light propagating in the forward direction by 45 ° counterclockwise and rotating the polarization direction of the light propagating in the reverse direction by 45 ° clockwise, i.e. the second angle and the third angle are both 45 °.
Fig. 3 illustrates a second schematic diagram of the working principle of the half-wave plate provided by the embodiment of the present invention, as shown in fig. 3, the optical axis direction of the half-wave plate in this embodiment forms an angle of 157.5 ° with the polarization direction of the incident polarized light.
Fig. 4 illustrates a third schematic diagram of the working principle of the half-wave plate according to the embodiment of the present invention, and as shown in fig. 4, the optical axis direction of the half-wave plate 9 in this embodiment forms an angle of 247.5 ° with the polarization direction of the incident polarized light. As is known from the principle of phase retardation, when the polarization direction of the incident light is at θ ° (i.e., the fourth angle is θ °) to the optical axis of the half-wave plate 9, the polarization direction of the incident light may be rotated by 2 θ °. By rotating the optical axis direction of the half-wave plate 9, the polarization direction of the light propagating through the forward direction is rotated counterclockwise by 45 °, and the polarization direction of the light propagating through the reverse direction is rotated clockwise by 45 °.
According to the embodiment of the present invention, as shown in fig. 1, the column vector fiber isolator includes a first polarization beam splitter 3, a second polarization beam splitter 12, a faraday rotator 6, a half-wave plate 9, a first light guide and a second light guide, the second polarization beam splitter 12 is disposed at a distance from the first polarization beam splitter 3, and the second polarization beam splitter 12 is symmetrical to the first polarization beam splitter 3 about a setting axis. The faraday rotator 6 is disposed between the first polarization beam splitter 3 and the second polarization beam splitter 12, the faraday rotator 6 is adapted to rotate the polarization direction of the incident light passing through the faraday rotator 6 clockwise by a first angle, which may be 45 °, and gaps are formed between the faraday rotator 6 and the first polarization beam splitter 3 and the half-wave plate 9, respectively.
The half-wave plate 9 is disposed between the faraday rotator 6 and the second polarization beam splitter 12, an optical axis of the half-wave plate 9 is rotated clockwise by 67.5 ° compared to an optical axis of a conventional half-wave plate, and a fourth angle is formed between the optical axis of the half-wave plate 9 and a polarization direction of incident light, the fourth angle being 22.5 °. The half-wave plate 9 is adapted to rotate the polarization direction of the incident light passing through the half-wave plate 9 in the forward direction by a second angle counterclockwise and to rotate the polarization direction of the incident light passing through the half-wave plate 9 in the reverse direction by a third angle clockwise, in this embodiment both the second angle and the third angle being 45 °. The first polarization beam splitter 3, the second polarization beam splitter 12, the faraday rotator 6 and the half-wave plate 9 are in the same straight line.
The first light guide is connected to the first light inlet side of the first polarization beam splitter 3, and the first light guide is a first optical fiber 1. The second light guide is connected to the first light-entering side of the second polarization beam splitter 12, and the second light guide is a second optical fiber 14.
The working principle of the column vector optical fiber isolator is as follows:
as shown in fig. 5 to 8, the arrows on the circles indicate the polarization directions of light, and the arrows from left to right are positive directions and the arrows from right to left are negative directions.
Fig. 5 illustrates one of the working principle diagrams of the cylindrical vector optical fiber isolator according to the embodiment of the present invention, as shown in fig. 5, the first radial polarized light 2 is input from the first optical fiber 1 in the forward direction, first, the first radial polarized light 2 is divided into the first vertical polarized light 4 and the first horizontal polarized light 5 by the first polarization beam splitter 3, and the first vertical polarized light 4 is directly transmitted and output, and the first horizontal polarized light 5 is output in a downward deflection manner. Then, the polarization directions of the first vertically polarized light 4 and the first horizontally polarized light 5 are rotated clockwise by 45 ° by the faraday rotator 6, and the first vertically polarized light 4 is changed into the first polarized light 7 and the first horizontally polarized light 5 is changed into the second polarized light 8. The first and second polarized light 7, 8 then pass through a half-wave plate 9, and the polarization directions of the first and second polarized light 7, 8 are rotated 45 ° counterclockwise, so that the first polarized light 7 becomes the second vertically polarized light 10 and the second polarized light 8 becomes the second horizontally polarized light 11. And finally, the second vertical polarized light 10 is directly transmitted and output through the second polarization beam splitter 12, and the second horizontal polarized light 11 is output in an upward deflection mode, so that the second vertical polarized light 10 and the second horizontal polarized light 11 are synthesized into second radial polarized light 13 and then coupled into the second optical fiber 14 for output, and basically no loss exists.
Fig. 6 illustrates a second schematic working principle of the cylindrical vector fiber isolator according to the embodiment of the present invention, as shown in fig. 6, the second radial polarized light 13 is input from the optical fiber 14 in the opposite direction, first, the second polarization beam splitter 12 splits the second radial polarized light 13 into the third vertical polarized light 15 and the third horizontal polarized light 16, and the third vertical polarized light 15 is directly transmitted and output, and the third horizontal polarized light 16 is output in a downward deflection manner. Next, the third vertically polarized light 15 and the third horizontally polarized light 16 pass through the half-wave plate 9, and the polarization directions of the third vertically polarized light 15 and the third horizontally polarized light 16 are rotated clockwise by 45 ° to become the third polarized light 17 and the fourth polarized light 18. The third polarized light 17 and the fourth polarized light 18 then pass through the faraday rotator 6, and the polarization directions of the third polarized light 17 and the fourth polarized light 18 are rotated clockwise by 45 °, so that the third polarized light 17 becomes the fourth horizontal polarized light 19, and the fourth polarized light 18 becomes the fourth vertical polarized light 20. Finally, the fourth horizontal polarized light 19 is deflected upwards through the first polarization beam splitter 3 and is output, and the fourth vertical polarized light 20 is directly transmitted and output, so that radial polarized light cannot be synthesized, the fifth horizontal polarized light 21 and the fifth vertical polarized light 22 cannot be coupled into the first optical fiber 1, large reverse loss is caused, and isolation of reverse light is achieved.
Fig. 7 illustrates a third schematic diagram of the working principle of the column vector fiber isolator according to the embodiment of the present invention, as shown in fig. 7, the first angular polarized light 23 is input from the first optical fiber 1 in the forward direction, first, the first polarization beam splitter 3 splits the first angular polarized light 23 into sixth vertical polarized light 24 and sixth horizontal polarized light 25, and the sixth vertical polarized light 24 is directly transmitted and output, and the sixth horizontal polarized light 25 is output in a downward deflection manner. Then, the polarization directions of the sixth vertically polarized light 24 and the sixth horizontally polarized light 25 are rotated clockwise by 45 ° by the faraday rotator 6, and the sixth vertically polarized light 24 is changed into the fifth polarized light 26, and the sixth horizontally polarized light 25 is changed into the sixth polarized light 27. The fifth 26 and sixth 27 polarized light then passes through the half-wave plate 9, and the polarization directions of the fifth 26 and sixth 27 polarized light are rotated 45 ° counterclockwise, so that the fifth 26 polarized light becomes seventh vertically polarized light 28 and the sixth 27 polarized light becomes seventh horizontally polarized light 29. And finally, the seventh vertically polarized light 28 is directly transmitted and output through the second polarization beam splitter 12, and the seventh horizontally polarized light 29 is output in an upward deflection manner, so that the seventh vertically polarized light 28 and the seventh horizontally polarized light 29 are synthesized into second angularly polarized light 30, and then the second angularly polarized light is coupled into the second optical fiber 14 for output without loss basically.
Fig. 8 illustrates a fourth schematic diagram of the working principle of the cylindrical vector optical fiber isolator according to the embodiment of the present invention, as shown in fig. 8, the second angularly polarized light 30 is input from the second optical fiber 14 in the reverse direction, first, the second polarization beam splitter 12 splits the second angularly polarized light 30 into an eighth vertically polarized light 31 and an eighth horizontally polarized light 32, and the eighth vertically polarized light 31 is directly transmitted and output, and the eighth horizontally polarized light 32 is output in a downward deflection manner. The eighth vertically polarized light 31 and the eighth horizontally polarized light 32 then pass through the half-wave plate 9, and the polarization directions of the eighth vertically polarized light 31 and the eighth horizontally polarized light 32 are both rotated by 45 ° clockwise, becoming seventh polarized light 33 and eighth polarized light 34. The seventh polarized light 33 and the eighth polarized light 34 then pass through the faraday rotator 6, and the polarization directions of the seventh polarized light 33 and the eighth polarized light 34 are rotated clockwise by 45 °, so that the seventh polarized light 33 becomes the ninth horizontally polarized light 35, and the eighth polarized light 34 becomes the ninth vertically polarized light 36. Finally, the ninth horizontal polarized light 35 is deflected upwards through the first polarization beam splitter 3 and is output, and the ninth vertical polarized light 36 is directly transmitted and output, so that the angular polarized light cannot be synthesized, the tenth horizontal polarized light 37 and the tenth vertical polarized light 38 cannot be coupled into the first optical fiber 1, a large reverse loss is caused, and isolation of the reverse light is realized.
An embodiment of the present invention further provides an optical device, where the optical device includes the column vector optical fiber isolator described in any one of the above embodiments.
According to the embodiment of the present invention, the optical device is an optical fiber amplifier, but the optical device is not limited to the optical fiber amplifier and may be a laser.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. A column vector fiber isolator, comprising:
a first polarizing beam splitter;
the second polarization beam splitter is arranged at an interval with the first polarization beam splitter and is symmetrical to the first polarization beam splitter about a set axis;
a first optical member disposed between the first and second polarization beam splitters, the first optical member being adapted to rotate a polarization direction of incident light passing through the first optical member clockwise by a first angle;
a second optical member disposed between the first optical member and the second polarization beam splitter, the second optical member being adapted to rotate a polarization direction of incident light passing through the second optical member in a forward direction by a second angle counterclockwise and to rotate a polarization direction of incident light passing through the second optical member in a reverse direction by a third angle clockwise;
the first angle is equal to the second angle, which is equal to the third angle.
2. The column vector fiber isolator of claim 1, further comprising a first light guide connected to the first light input side of the first polarization beam splitter and a second light guide connected to the first light input side of the second polarization beam splitter.
3. The column vector fiber isolator of claim 2, wherein the first light guide and the second light guide are both optical fibers.
4. The column vector fiber isolator of any one of claims 1 to 3, wherein the first optical component comprises a Faraday rotator that is separated from the first polarization beam splitter and the second optical component by a gap.
5. The column vector fiber isolator of any one of claims 1 to 3, wherein the second optical component comprises a half-wave plate, the half-wave plate having a gap formed with the second polarizing beam splitter.
6. The column vector fiber isolator of claim 5, wherein the optical axis of the half-wave plate makes a fourth angle with the polarization direction of the incident light.
7. The column vector fiber isolator of claim 6, wherein the second angle is twice the fourth angle.
8. An optical device comprising the column vector optical fiber isolator of any one of claims 1 to 7.
9. The optical device of claim 8, wherein the optical device is a fiber amplifier.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111089965.9A CN113534351B (en) | 2021-09-17 | 2021-09-17 | A column vector optical fiber isolator and optical equipment |
| PCT/CN2022/117821 WO2023040746A1 (en) | 2021-09-17 | 2022-09-08 | Cylindrical vector fiber optic isolator and optical device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111089965.9A CN113534351B (en) | 2021-09-17 | 2021-09-17 | A column vector optical fiber isolator and optical equipment |
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| CN113534351A CN113534351A (en) | 2021-10-22 |
| CN113534351B true CN113534351B (en) | 2022-02-11 |
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| CN202111089965.9A Active CN113534351B (en) | 2021-09-17 | 2021-09-17 | A column vector optical fiber isolator and optical equipment |
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| WO (1) | WO2023040746A1 (en) |
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| CN113534351B (en) * | 2021-09-17 | 2022-02-11 | 北京工业大学 | A column vector optical fiber isolator and optical equipment |
| CN119509403A (en) * | 2024-08-30 | 2025-02-25 | 深圳市华汉伟业科技有限公司 | A structured light imaging device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2775547B2 (en) * | 1992-02-17 | 1998-07-16 | 秩父小野田株式会社 | Optical isolator |
| US6101026A (en) * | 1998-01-27 | 2000-08-08 | Agilent Technologies, Inc. | Reversible amplifier for optical networks |
| JP4714811B2 (en) * | 2004-02-26 | 2011-06-29 | 並木精密宝石株式会社 | Optical isolator and optical device |
| US20070115551A1 (en) * | 2005-04-01 | 2007-05-24 | Alexis Spilman | Space-variant waveplate for polarization conversion, methods and applications |
| CN101581837A (en) * | 2009-03-26 | 2009-11-18 | 南京大学 | Method for arranging bidirectional optical isolator |
| CN202794598U (en) * | 2012-09-29 | 2013-03-13 | 福州高意通讯有限公司 | Optical isolator and optical circulator |
| CN204143105U (en) * | 2014-10-13 | 2015-02-04 | 武汉锐科光纤激光器技术有限责任公司 | A kind of high power optical isolator of small size |
| CN107238952B (en) * | 2017-06-30 | 2018-10-19 | 深圳市创鑫激光股份有限公司 | Adjust method, fibre optic isolater and the optical fiber laser of isolation |
| CN109164605A (en) * | 2018-11-07 | 2019-01-08 | 福建福晶科技股份有限公司 | It is a kind of to polarize unrelated free space type isolator |
| CN213240586U (en) * | 2020-10-23 | 2021-05-18 | 吕成江 | Micro-structure reflection-type optical isolator |
| CN213276022U (en) * | 2020-11-10 | 2021-05-25 | 福建福晶科技股份有限公司 | Polarization-independent optical circulator |
| CN113534351B (en) * | 2021-09-17 | 2022-02-11 | 北京工业大学 | A column vector optical fiber isolator and optical equipment |
-
2021
- 2021-09-17 CN CN202111089965.9A patent/CN113534351B/en active Active
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| CN113534351A (en) | 2021-10-22 |
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