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WO2003005086A1 - Dispositif a reseau a guides d'ondes en faisceau (awg) asymetrique - Google Patents

Dispositif a reseau a guides d'ondes en faisceau (awg) asymetrique Download PDF

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Publication number
WO2003005086A1
WO2003005086A1 PCT/CN2001/001158 CN0101158W WO03005086A1 WO 2003005086 A1 WO2003005086 A1 WO 2003005086A1 CN 0101158 W CN0101158 W CN 0101158W WO 03005086 A1 WO03005086 A1 WO 03005086A1
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WIPO (PCT)
Prior art keywords
waveguide
coupler
waveguide grating
input
arrayed
Prior art date
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Ceased
Application number
PCT/CN2001/001158
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English (en)
Chinese (zh)
Inventor
Sailing He
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HANGZHOU COER PHOTONIC INFORMATION TECHNOLOGIES Ltd
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HANGZHOU COER PHOTONIC INFORMATION TECHNOLOGIES Ltd
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Priority to PCT/CN2001/001158 priority Critical patent/WO2003005086A1/fr
Priority to CN01823432.1A priority patent/CN1227548C/zh
Publication of WO2003005086A1 publication Critical patent/WO2003005086A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
    • G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
    • G02B6/12007—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind forming wavelength selective elements, e.g. multiplexer, demultiplexer
    • G02B6/12009—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind forming wavelength selective elements, e.g. multiplexer, demultiplexer comprising arrayed waveguide grating [AWG] devices, i.e. with a phased array of waveguides
    • G02B6/12014—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind forming wavelength selective elements, e.g. multiplexer, demultiplexer comprising arrayed waveguide grating [AWG] devices, i.e. with a phased array of waveguides characterised by the wavefront splitting or combining section, e.g. grooves or optical elements in a slab waveguide

Definitions

  • the present invention relates to an asymmetric arrayed waveguide grating (AWG) device, and more particularly, to an asymmetric arrayed waveguide grating device having an optimal spectral passband response and minimum loss.
  • AVG asymmetric arrayed waveguide grating
  • Wavelength division multiplexing (demultiplexing) devices and routers are key components in optical communication networks.
  • arrayed waveguide grating (AWG) devices have been widely used in wavelength division multiplexing (WDM) systems.
  • a problem with the traditional type of AWG wavelength division multiplexing device is that its frequency band has a sharp peak shape, that is, it has the maximum transmission rate at the center wavelength, and when the wavelength is offset from this center wavelength, it passes The rate will drop rapidly. In this way, the wavelengths of all optical signals in the optical network must be very accurate to avoid degradation of system performance. This has led to stringent requirements for the design and operation of the entire optical network and its components.
  • multiplexers multiplexers
  • demultiplexers demultiplexers
  • An AWG can serve as both a multiplexer and a demultiplexer. The only difference is that the direction of light passing through the device is opposite. For convenience, only the demultiplexer is described below.
  • the present invention is also applicable to multiplexers.
  • an AWG device When an AWG device is used as a demultiplexer, it consists of an input waveguide, a first star coupler (input coupler), an array waveguide with an optical path difference between adjacent waveguides, and a second star coupler (output coupler). And multiple output waveguides; each output waveguide receives light of a different wavelength, the first star coupler couples the input composite light into the array waveguide, and the dispersion function of the array waveguide grating for different wavelengths makes the first waveguide After the two-star coupler, different wavelengths of light are focused on different output waveguides.
  • the input and output waveguides of AWG devices are single-mode.
  • the lateral optical field distribution of the input and output waveguides can usually be approximated by a Gaussian function.
  • the input field distribution is imaged on the output waveguide by AWG. If the center of the image field distribution and the mode field distribution of the output waveguide are aligned, then we can get the maximum coupling efficiency.
  • the center of the image field distribution and the mode field distribution of the output waveguide will also shift, so that the coupling efficiency will decrease accordingly.
  • the overlapping integration of the two mode field distributions determines the channel's spectral response. This response is approximately a Gaussian function.
  • the ideal shape of the spectrum response is a rectangular function.
  • both sides of the spectrum curve It should be as steep as possible to reduce crosstalk between two adjacent channels.
  • US Patent No. 5412744 discloses one: "Frequency routing device having a wide and substantially flat passband.”
  • the patent provides a method for flattening the spectral response. In this method, the light received by two adjacent output waveguides is recombined by using a Y-shaped connector. In this method, To maintain the required level of crosstalk, there must be extra space between adjacent pairs of output waveguides. The number of channels and channel bandwidth that this device can obtain is severely limited.
  • U.S. Patent No. 6141152 discloses a "Multiplexer / Demultiplexer with flattened spectral response" patent, which uses multiple-grating-circle in the AWG ) Design, so that multiple input mode field distribution images are projected onto the output waveguide. In this way, the comprehensive spectral response can be flattened and the passband widened, but the two edge portions of the spectral response curve cannot be obtained. Improvement, and insertion loss will also increase significantly.
  • Figure 1 shows a conventional arrayed waveguide grating.
  • Each of the waveguides in the arrayed waveguide 30 has a different length, and a corresponding optical path difference is generated between adjacent waveguides, thereby achieving a similar function to a grating.
  • This device can be used as a complex
  • a composite optical signal containing multiple wavelengths is coupled to one of the input waveguides, and each wavelength channel is separated and focused by the array waveguide grating.
  • Each output waveguide is coupled to one of the input waveguides, and each wavelength channel is separated and focused by the array waveguide grating.
  • the channel wavelength of the output waveguide can be changed. If used as a wavelength router (such as NX N), multiple inputs and outputs are used simultaneously. Therefore, similar to the star coupler on the output side, the free transmission area in the star coupler on the input side and the array waveguide at the interface of the array waveguide grating must be arranged on an arc at equal intervals. Therefore, even if the input waveguide is different from the output waveguide in terms of width, pitch, number, etc. in some designs, the arrayed waveguide grating 30 itself is substantially symmetrical.
  • the first star coupler is equivalent to a 1 X N beam splitter. Therefore, at the interface between the free transmission area of the first star coupler and the arrayed waveguide grating, the arrayed waveguide does not need to be arranged at equal intervals, nor does it need to be on an arc. With these additional degrees of freedom, other properties of the star coupler can be further optimized, such as generating a certain field distribution at the array waveguide and obtaining the maximum total coupling efficiency at the same time. In addition, by combining with the phase adjustment in the array waveguide, You can get a desired spectral response with minimal loss. Disclosure of invention
  • the main purpose of the present invention is to provide an asymmetric arrayed waveguide grating device.
  • an asymmetric AWG device By designing an asymmetric AWG device, the frequency spectrum can be flattened accordingly, the passband can be widened, and the insertion loss and crosstalk of the device can be reduced.
  • an asymmetric array waveguide grating device To achieve the purpose of the present invention, we propose an asymmetric array waveguide grating device.
  • the design of the output coupler is similar to the traditional AWG design (that is, the tail ends of the AWG are evenly arranged along the circumference), and the input coupler and its The design of the waveguide tail is different, so devices designed in this way are generally asymmetric.
  • At least one input waveguide which transmits multiple composite signals of different wavelengths
  • An input beam splitting coupler connected to the input waveguide and receiving a composite signal from the input waveguide;
  • An array waveguide grating which is composed of a plurality of waveguides of different lengths, and is connected with the input Beam splitter connection;
  • a star-shaped focusing coupler connected to the arrayed waveguide grating, which converts the role dispersion of signals of different wavelengths into a spatial displacement dispersion with a focus line;
  • a plurality of output waveguides coupled with the star-shaped focusing coupler, and the tail ends of the output waveguides are arranged on the focusing lines of the star-shaped focusing coupler and respectively transmit optical signals of different wavelengths;
  • the input beam splitting coupler connects the arrayed waveguide grating and the input waveguide.
  • the tail ends of the waveguides of the arrayed waveguide grating are not arranged at equal intervals along the circumference.
  • the coupling coefficient is a predetermined distribution function.
  • the junction between the arrayed waveguide and the input beam splitting coupler at the input end has a different distance between the position of the tail end of each waveguide and the tail end of the input waveguide.
  • a connection end of each waveguide and an input beam splitter coupler has a different entrance width.
  • the asymmetric arrayed waveguide grating device wherein in the arrayed waveguide grating, there is a different waveguide center to waveguide center distance between each waveguide and the connection end of the input beam splitting coupler, so that the total coupling Maximum efficiency.
  • a connection end of each waveguide is located on a circular arc centered at an end of an input waveguide, but has different entrance widths and different waveguides.
  • the center distance so that the energy of each waveguide coupled to the arrayed waveguide grating has a predetermined distribution function, while maximizing the total coupling efficiency.
  • the input beam splitting coupler is a multi-stage 1 ⁇ 2 Y-waveguide input beam splitting coupler.
  • the asymmetric arrayed waveguide grating device wherein the multi-stage input beam splitter coupler is an asymmetrical Y-waveguide coupler with an unbalanced coupling coefficient, so that each of the arrayed waveguide gratings coupled to the arrayed waveguide grating is coupled.
  • the energy of the waveguide has a predetermined distribution function.
  • the amplitude coupling coefficient between the input waveguide and each waveguide of the array waveguide grating is adjusted so that the field distribution at the connection between the output coupler and the array waveguide has a predetermined
  • the distribution function is such that the top of the spectral response curve of each channel is flat enough and the edges are sharp enough.
  • the predetermined distribution function is a sine function divided by a Gaussian function, and the sine function is basically consistent with a desired inverse Fourier transform of a spectral response function, and the The Gaussian function is basically the same as the inverse Fourier transform of the mode field distribution function of the output waveguide, which corresponds to the optical properties of the focused star coupler.
  • the asymmetric arrayed waveguide grating device wherein the length of each waveguide of the arrayed waveguide grating is to be adjusted, except that an adjacent phase difference between an integer multiple of 2 ⁇ of a given channel wavelength is generated between adjacent waveguides.
  • the phase difference introduced by the above-mentioned coupler must be compensated, and in these waveguides, the ⁇ phase shift required when the field distribution function at the connection between the predetermined output coupler and the array waveguide is negative is generated.
  • Another asymmetric arrayed waveguide grating device includes:
  • At least one input waveguide which transmits multiple composite signals of different wavelengths
  • An array waveguide grating which is composed of a plurality of waveguides of different lengths, and is connected to the input beam splitting coupler;
  • a star-shaped focusing coupler connected to the arrayed waveguide grating, which converts the role dispersion of signals of different wavelengths into a spatial displacement dispersion with a focus line;
  • a plurality of output waveguides coupled with the star-shaped focusing coupler, and the tail ends of the output waveguides are arranged on the focusing lines of the star-shaped focusing coupler and respectively transmit optical signals of different wavelengths;
  • It also includes an optical attenuator or amplifier, which is used in at least a part of the waveguides of the arrayed waveguide grating, which are in combination with the input waveguide and the waveguide of the arrayed waveguide grating.
  • the combination of the coupling coefficients results in a certain light intensity distribution function at the interface between the arrayed waveguide grating and the focusing star coupler at the output end.
  • This light intensity distribution function is equal to a sinc_function divided by a Gaussian function, thereby obtaining a Steep channel spectral response curve on both flat sides.
  • the sine function is obtained by performing an inverse Fourier transform on a desired spectral response
  • the Gaussian function is an inverse Fourier transform of a mode field distribution of a single-pass chirped output waveguide. Obtained, and the Fourier transform corresponds to the optical properties of the focusing star coupler.
  • the asymmetric arrayed waveguide grating device wherein the length of each waveguide of the arrayed waveguide grating is to be adjusted, except that an adjacent phase difference between an integer multiple of 2 ⁇ of a given channel wavelength is generated between adjacent waveguides.
  • the phase difference introduced by the input beam splitting coupler must be compensated, and in some waveguides, the field distribution function at the connection between the predetermined output coupler and the array waveguide is negative (required at all times) ⁇ phase shift.
  • FIG. 1 is a schematic diagram of a conventional AWG wavelength division multiplexing device corresponding to the prior art
  • FIG. 2 (a) is a schematic diagram of an asymmetric AWG wavelength division multiplexing device according to an embodiment of the present invention
  • FIG. 2 (b) is a diagram Enlarged drawing of the star coupler at the input in 2a;
  • FIG. 3 is an enlarged view of an input star coupler according to another embodiment of the present invention
  • FIG. 4 is an enlarged view of an input multistage separator of another embodiment of the present invention
  • FIG. 5 is a conventional AWG in a coupler free Field distribution at the junction of the transmission region and the AWG
  • Figure 6 (a) is an amplitude distribution diagram of the junction between the free transmission region in the coupler and the AWG of the AWG device according to a specific embodiment of the present invention
  • FIG. 6 (b) is a phase distribution of an AWG device in a specific embodiment of the present invention at the connection between the free transmission area in the coupler and the AWG.
  • the phase term is excluding the conventional phase difference 2im ⁇ .
  • FIG. 7 is FIG. 6
  • the simulation results of the spectral response of the AWG device are compared with those of the traditional AWG. The best way to implement the invention
  • FIG. 2 (a) is a schematic diagram of an asymmetric AWG device according to the first embodiment of the present invention.
  • the design of the output coupler is similar to the traditional AWG design (that is, the tail ends of the AWG have the same width and are arranged uniformly along the circumference)
  • the design of the input coupler is very different.
  • Figure 2 (b) is an enlarged view of the input star coupler in Figure 2 (a).
  • the free transmission area in the input coupler and the contact line of the array waveguide are an optimized curve (such as a sine function) instead of a circular arc.
  • the distance from the input waveguide to the array waveguide entrance, as well as the waveguide entrance width, varies, so that the light energy received by each waveguide in the AWG varies according to a predetermined function.
  • the spacing between the waveguides is also adjusted and changed to maximize the total coupling efficiency.
  • the length of the AWG's waveguide is also adjusted so that the distribution of the complex field (including amplitude and phase) at the connection between the free transmission area in the output coupler and the AWG is consistent with the predetermined one, so that the desired output channel can be obtained The obtained spectral response.
  • FIG. 3 is an enlarged view of an input-side star coupler in a second embodiment of the present invention; the connection point between the free transmission area in the input coupler and the AWG is on the circumference centered on the tail of the input waveguide. It is similar to the traditional AWG. However, the waveguide entrance width of the input star coupler and the waveguide center distance (at the point where the free transmission area in the input coupler and the array waveguide contact) are adjusted and changed to enable the expected total coupling efficiency Amplitude distribution. Compared with the input star coupler designed by Okamoto and H. Yamada in the article (Optics Lett.
  • the center-to-center spacing between adjacent waveguides at the junction of the free transmission area and AWG is no longer constant It is adjusted together with the waveguide entrance width. If the device is operated in the opposite direction, the wavelength dispersion characteristics of the AWG will be lost. However, when the device operates in the designed light propagation direction, this degree of freedom allows the coupling efficiency to be maximized while the waveguide entrance width is changed.
  • Figure 4 shows a third embodiment of the present invention; in order to obtain the expected amplitude distribution with maximum coupling efficiency, the star coupler is replaced with a multi-stage beam splitter (such as a 1 X 2 Y beam splitter ).
  • the beam splitting ratio of the coupler is designed according to the intensity distribution required by the array waveguide. In principle, a high coupling efficiency can be obtained because there is no loss other than the loss caused by manufacturing defects.
  • the coupler / beam splitter in the present invention introduces phase differences for different paths. These optical path differences must be compensated by adjusting the waveguide length in the AWG. Coupler The combination of the / beamsplitter and AWG must produce a predetermined intensity and phase distribution at the interface of the second (ie, output) star coupler's AWG and planar slab waveguide.
  • the field distribution at the connection between the free transmission area in the second star coupler and the AWG should be basically one
  • the sine function is divided by a Gaussian function.
  • This sine function is basically the same as the inverse Fourier transform of the desired spectral response function, and this Gaussian function is basically the same as the inverse Fourier transform of the mode field distribution function of the output waveguide.
  • the Fourier transform is produced by the optical properties of a focused star coupler.
  • the field distribution at the AWG interface should be the inverse Fourier transform of A (x), that is, ux
  • n is the effective refractive index of the planar waveguide and is the length of the output star coupler
  • X is the coordinate at the interface between the AWG grating and the output star coupler.
  • a g (u) is a sine function, ie
  • the spectral response function corresponds to the convolution of the field distribution on the output waveguide plane and the mode field distribution function of the output waveguide, in order to obtain a spectral response close to a rectangular function, the field distribution on the output waveguide plane A
  • G (x) is the normalized mode field distribution function of the output waveguide, which can generally be approximated as a Gaussian function.
  • G (X) can be expressed as
  • w Q is the beam waist width of the Gaussian mode field distribution.
  • G g (u) is the inverse Fourier transform of G (x), ie
  • the intensity and phase distribution of the AWG is adjusted according to a sine function distribution.
  • the field distribution on the output waveguide plane is basically similar to a rectangular function.
  • the shape of its spectral response curve is basically equal to the convolution of this field distribution and mode field distribution (basically Gaussian). This results in slow slope changes on both sides of the spectral response curve, although the bandwidth is broadened and flattened.
  • the channel photophonic response (rather than the field distribution of the output plane) basically becomes a rectangular function. So this result is much better than the previous method.
  • Waveguide effective refractive index nwg l.465,
  • the center wavelength is 1.55um
  • the center distance between the receiving waveguides is 24.305 um
  • Figure 5 shows the Gaussian intensity distribution of the conventional AWG at the interface between the AWG of the output star coupler and the planar slab waveguide.
  • Fig. 6a is an example of the intensity distribution at the interface between the AWG of the output star coupler and the planar slab waveguide according to an important embodiment of the present invention.
  • Fig. 6b is the corresponding phase distribution.
  • Figure 7 is the simulated spectral response (solid line) of the AWG example we designed in Figure 6, and the traditional AWG spectral effect (dashed line) is added for comparison.
  • the top of the spectral response curve is widened and flattened, while the edges on both sides become steeper.
  • a Gaussian function ie, formula (1 1)
  • the coupling coefficient distribution at the input of the AWG should be the formula (1 1) divided by a Gaussian function Gl (x), where Gl (x) Field distribution at the entrance of the array waveguide when the fundamental mode is input from the center input waveguide.
  • the asymmetric arrayed waveguide grating device we have proposed optimizes the input beam splitter coupler according to different functions so that it becomes an asymmetrical arrayed waveguide grating.
  • the asymmetrical arrayed waveguide grating has a flat spectral response and a passband. It is wider, and the insertion loss and crosstalk of the device are reduced.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Integrated Circuits (AREA)

Abstract

L'invention concerne un dispositif à réseau à guides d'ondes en faisceau (AWG) asymétrique qui comprend principalement un coupleur, situé côté entrée, des guides d'ondes en faisceau et un coupleur situé côté sortie, dans lequel un bord d'arc non circulaire entre une région d'espace libre du coupleur côté entrée et les guides d'ondes en faisceau est optimisé. La distance séparant un guide d'ondes d'entrée des ports de guides d'ondes en faisceau, les largeurs et les intervalles de ces ports varient de telle sorte que l'intensité de lumière reçue par chaque guide d'ondes du réseau AWG présente une certaine distribution permettant d'atteindre une efficacité de couplage générale la plus élevée, et les longueurs des guides d'ondes en faisceau sont réglées,et la distribution de champ au niveau de la connexion de la région d'espace libre et des guides d'ondes en faisceau dans le coupleur côté sortie sont conformes à une fonction sinc divisée par une fonction gaussienne, c'est-à-dire que la réponse spectrale de la fréquence de canal présente un sommet plat et un bord fortement incliné.
PCT/CN2001/001158 2001-07-06 2001-07-06 Dispositif a reseau a guides d'ondes en faisceau (awg) asymetrique Ceased WO2003005086A1 (fr)

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Application Number Priority Date Filing Date Title
PCT/CN2001/001158 WO2003005086A1 (fr) 2001-07-06 2001-07-06 Dispositif a reseau a guides d'ondes en faisceau (awg) asymetrique
CN01823432.1A CN1227548C (zh) 2001-07-06 2001-07-06 非对称阵列波导光栅器件

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PCT/CN2001/001158 WO2003005086A1 (fr) 2001-07-06 2001-07-06 Dispositif a reseau a guides d'ondes en faisceau (awg) asymetrique

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7065273B2 (en) * 2003-06-20 2006-06-20 Intel Corporation Wideband arrayed waveguide grating
US8208191B2 (en) 2008-10-30 2012-06-26 Leigh University Ultra-wide band slow light structure using plasmonic graded grating structures
WO2022148327A1 (fr) * 2021-01-08 2022-07-14 华为技术有限公司 Réseau de guides d'ondes en réseau et son procédé de fabrication, émetteur-récepteur et système de communication optique
CN116295029A (zh) * 2023-02-16 2023-06-23 哈尔滨工业大学 倾斜耦合式光纤光谱共焦位移测量方法及装置
CN117170032A (zh) * 2023-09-05 2023-12-05 上海铭锟半导体有限公司 一种降低awg串扰的方法及其波分复用器件

Families Citing this family (3)

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Publication number Priority date Publication date Assignee Title
CN100383582C (zh) * 2005-11-30 2008-04-23 中国科学院半导体研究所 3dB耦合波导实现阵列波导光栅输出平坦化的方法
JP4456065B2 (ja) * 2005-12-21 2010-04-28 日本電信電話株式会社 アレイ導波路格子回路
US12429701B2 (en) 2021-12-13 2025-09-30 Samsung Electronics Co., Ltd. Augmented reality device based on curved waveguide, method therefor, augmented reality glasses based on said device

Citations (4)

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Publication number Priority date Publication date Assignee Title
US5841919A (en) * 1996-08-02 1998-11-24 Hitachi Cable, Ltd. Optical wavelength multiplexer/demultiplexer
GB2334594A (en) * 1998-02-20 1999-08-25 Fujitsu Telecommunications Eur Arrayed waveguide grating device
US5982960A (en) * 1997-01-22 1999-11-09 Hitachi Cable, Ltd. Optical wavelength multiplexer/demultiplexer
JPH11352343A (ja) * 1998-06-10 1999-12-24 Nec Corp アレイ導波路格子

Patent Citations (4)

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Publication number Priority date Publication date Assignee Title
US5841919A (en) * 1996-08-02 1998-11-24 Hitachi Cable, Ltd. Optical wavelength multiplexer/demultiplexer
US5982960A (en) * 1997-01-22 1999-11-09 Hitachi Cable, Ltd. Optical wavelength multiplexer/demultiplexer
GB2334594A (en) * 1998-02-20 1999-08-25 Fujitsu Telecommunications Eur Arrayed waveguide grating device
JPH11352343A (ja) * 1998-06-10 1999-12-24 Nec Corp アレイ導波路格子

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7065273B2 (en) * 2003-06-20 2006-06-20 Intel Corporation Wideband arrayed waveguide grating
US8208191B2 (en) 2008-10-30 2012-06-26 Leigh University Ultra-wide band slow light structure using plasmonic graded grating structures
WO2022148327A1 (fr) * 2021-01-08 2022-07-14 华为技术有限公司 Réseau de guides d'ondes en réseau et son procédé de fabrication, émetteur-récepteur et système de communication optique
CN116295029A (zh) * 2023-02-16 2023-06-23 哈尔滨工业大学 倾斜耦合式光纤光谱共焦位移测量方法及装置
CN117170032A (zh) * 2023-09-05 2023-12-05 上海铭锟半导体有限公司 一种降低awg串扰的方法及其波分复用器件

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CN1227548C (zh) 2005-11-16

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