CN119675781A - Reconfigurable microwave photonic link with adaptive bandwidth and dynamic range and implementation method - Google Patents
Reconfigurable microwave photonic link with adaptive bandwidth and dynamic range and implementation method Download PDFInfo
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Abstract
本发明公开了一种适应带宽及动态范围可重构的微波光子链路及实现方法，其中实现方法包括：通过激光器产生光载波并注入双平行马赫‑曾德尔调制器中，在双平行马赫‑曾德尔调制器的输入端分为比例可调的两束，分别注入至双平行马赫‑曾德尔调制器的上路子调制器和下路子调制器；将射频信号施加在上路子调制器上，对注入的光载波进行调制；下路子调制器仅进行载波相位控制；通过偏置控制单元对双平行马赫‑曾德尔调制器进行直流偏置，并输出调制光信号。本发明通过对上路子调制器的直流偏置点进行调控及光功率分配比的优化，可分别实现三阶交调失真及二次谐波失真的抑制，实现微波光子链路窄带大动态、超宽带两种工作模式，且两种模式可灵活重构。
The present invention discloses a microwave photon link and implementation method that is adaptable to reconfigurable bandwidth and dynamic range, wherein the implementation method includes: generating an optical carrier through a laser and injecting it into a dual parallel Mach-Zehnder modulator, dividing it into two beams with adjustable ratios at the input end of the dual parallel Mach-Zehnder modulator, and injecting them into the upper sub-modulator and the lower sub-modulator of the dual parallel Mach-Zehnder modulator respectively; applying a radio frequency signal to the upper sub-modulator to modulate the injected optical carrier; the lower sub-modulator only performs carrier phase control; and direct current biasing the dual parallel Mach-Zehnder modulator through a bias control unit, and outputting a modulated optical signal. The present invention can respectively suppress third-order intermodulation distortion and second harmonic distortion by regulating the direct current bias point of the upper sub-modulator and optimizing the optical power distribution ratio, and realizes two working modes of the microwave photon link: narrowband large dynamic and ultra-wideband, and the two modes can be flexibly reconstructed.
Description
Technical Field
The invention relates to the technical field of microwave photons, in particular to a microwave photon link with reconfigurable adaptive bandwidth and dynamic range and an implementation method.
Background
The microwave photon technology is a novel cross subject combining the microwave technology and the photon technology, and performs generation, transmission, processing and the like of microwave signals in an optical domain. The microwave photon link based on external modulation has the advantages of large bandwidth, large dynamic range, high reliability and the like, and has good application prospect. However, for an electro-optic externally modulated microwave photon link, nonlinear distortion is usually easy to generate due to nonlinear effects of an electro-optic modulator, so that the spurious-free dynamic range of the microwave photon link is limited. The spurious-free dynamic range is a signal input power range in which the signal output power is greater than the system output noise floor power and the intermodulation distortion power is less than the system output noise floor power. Intermodulation distortion suppression is one of the most flexible and effective ways to improve spurious-free dynamic range.
At present, a plurality of reported microwave photon links use an electrical device for distortion elimination, and the frequency correlation characteristic of the electrical device enables the microwave photon links to realize the suppression of third-order intermodulation distortion only in a limited frequency range. In addition, the reported microwave photon links for performing third-order intermodulation distortion suppression in the optical domain, such as performing phase regulation on the optical carrier band by adopting a liquid crystal on silicon optical processor, and realizing nonlinear distortion cancellation by adopting a polarization phase modulator, a double parallel modulator and the like, are generally complicated in regulation. The limitation of the second-order spurious-free range caused by the second-order intermodulation distortion is less of a concern, but the problem needs to be solved urgently for a broadband radio frequency system. The microwave photon link which adapts to the working bandwidth and has no stray dynamic range flexible reconstruction according to the application scene can better promote the flexibility of the system, save the cost and have less related researches.
Disclosure of Invention
The invention provides a microwave photon link with reconfigurable adaptive bandwidth and dynamic range and an implementation method thereof, wherein by constructing mutually offset distortion signals, the dynamic range expansion under different bandwidths is realized, the control is simple and flexible, the requirements of different bandwidths and different dynamic ranges can be met, and two working modes of narrow-band large dynamic and ultra-wide band can be flexibly reconfigured. The invention can be applied to radar, communication and other systems, and is suitable for various radio frequency systems with reconstruction requirements for adaptive bandwidth and dynamic range.
The technical scheme adopted by the invention is as follows:
a method for realizing a microwave photon link with reconfigurable adaptive bandwidth and dynamic range comprises the following steps:
Generating an optical carrier wave through a laser and injecting the optical carrier wave into a double-parallel Mach-Zehnder modulator, dividing the input end of the double-parallel Mach-Zehnder modulator into two beams with adjustable proportion, and respectively injecting the two beams into an upper sub-modulator and a lower sub-modulator of the double-parallel Mach-Zehnder modulator, wherein the upper sub-modulator and the lower sub-modulator are connected in parallel and work in a push-pull state;
Applying a radio frequency signal to the upper sub-modulator to modulate the injected optical carrier;
The bias control unit applies direct-current bias voltage V 1 to the upper sub-modulator, the bias angle is And applying a DC bias voltage V 2 to the lower sub-modulator, wherein the DC bias voltage V 2 is related to the upper sub-modulator, and the bias angle isAnd is also provided withThe invention adopts a bias control mode which is related to each other, can avoid the simultaneous fine control of a plurality of direct current bias voltages, and greatly simplifies the difficulty of bias control;
A fixed direct current bias voltage V 3 is applied to a main modulator of the double parallel Mach-Zehnder modulator through a bias control unit, so that 180-degree phase difference is generated between the field intensities of the optical signals of the upper path and the lower path, and a modulated optical signal is output.
Further, after the modulated optical signals output by the double parallel Mach-Zehnder modulators are transmitted, square rate detection and photoelectric conversion can be performed through the photoelectric detector, and an emergent frequency signal can be recovered.
Further, the expression of the modulated optical signal output by the dual parallel mach-zehnder modulator includes:
Wherein, Is an optical carrier electric field, P is optical carrier optical power, omega c is optical carrier angular frequency, alpha is optical carrier optical power distribution ratio of an upper path, m=pi V RF/Vπ is a modulation coefficient, V RF is radio frequency signal amplitude, V π is half-wave voltage of an upper sub-modulator, and a bias angle is providedOffset angleOmega 1 and omega 2 are the angular frequencies of the radio frequency signal, which is a two-tone signal.
Further, after the modulated optical signal is input to the photodetector, the expression of the photocurrent I IMD3 of the third-order intermodulation distortion generated by the optical carrier, the sideband auto-beat frequency and the mutual beat frequency includes:
Wherein J n (m) is a Bessel function of a first type, photocurrents generated by the optical carrier and the sideband self-beat frequency of the upper sub-modulator are I 1,I2,I3 respectively, and photocurrents generated by the mutual beat frequency of the sideband of the upper sub-modulator and the carrier of the lower sub-modulator are I 4.
Further, the Bessel function of the first class is expanded, and the sum of the third-order intermodulation distortions is made to be zero, so that the conditions for eliminating the third-order intermodulation distortion are as follows:
There is an optimum offset angle And the optical power distribution ratio alpha meets the optimization conditions of complete suppression of third-order intermodulation distortion and third-order spurious-free dynamic range.
Further, by optimizing the optical power distribution ratio α and the offset angleThe sum of the photocurrents I 4 and I 1,I2,I3 is equal in amplitude and opposite in phase, so that the third-order intermodulation distortion suppression and the optimization of the third-order spurious-free dynamic range are realized, and the configuration of the narrow-band large-dynamic-range working mode of the microwave photon link is completed.
Further, after the modulated optical signal is input to the photodetector, a photocurrent expression for generating second harmonic distortion by the optical carrier, the sideband self-beat frequency and the mutual beat frequency includes:
Wherein J n (m) is Bessel function of the first kind, photocurrents generated by the carrier wave of the upper sub-modulator and the self-beat frequency of the sideband are I ' 1 and I ' 2 respectively, photocurrents generated by the mutual beat frequency of the sideband of the upper sub-modulator and the carrier wave of the lower sub-modulator are I ' 3, and bias angles on the lower sub-modulator are applied
Further, the Bessel functions of the first class are expanded, the sum of the second harmonic distortion products is zero, and the conditions for restraining the second harmonic distortion are as follows:
Since the conditions for generation and suppression of second order intermodulation distortion and second harmonic distortion in the link are equivalent, only second harmonic distortion suppression is used for analysis according to the link broadband characteristic requirement. There is an optimum offset angle And an optical power distribution ratio alpha' which satisfies the optimization conditions of complete suppression of second-order intermodulation distortion/second-order spurious-free dynamic range.
Further, by optimizing the optical power distribution ratio α' and the offset angleThe sum of the photocurrents I '1 and I' 2、I'3 is equal in amplitude and opposite in phase, so that the optimization of second-order intermodulation distortion/second-order harmonic distortion and second-order spurious-free dynamic range is realized, and the configuration of the ultra-wideband working mode of the microwave photon link is completed.
According to the invention, complex regulation and control of a plurality of bias points are not needed, and flexible reconstruction of two working modes of microwave photon link narrow-band large dynamic and ultra-wideband can be realized only by applying optimal configuration of bias angles and optical power distribution ratios to sub-modulators on the double parallel Mach-Zehnder modulators.
The microwave photon link comprises a laser, a double parallel Mach-Zehnder modulator, a bias control unit and a photoelectric detector, wherein the double parallel Mach-Zehnder modulator comprises an upper sub-modulator, a lower sub-modulator and a main modulator, the upper sub-modulator and the lower sub-modulator are connected in parallel and work in a push-pull state, and the upper sub-modulator and the lower sub-modulator are respectively positioned on the upper arm and the lower arm of the main modulator;
the laser generates an optical carrier wave and is injected into a double parallel Mach-Zehnder modulator, the input end of the double parallel Mach-Zehnder modulator is divided into two beams with adjustable proportion, and the two beams are respectively injected into an upper sub-modulator and a lower sub-modulator;
The bias control unit is configured to apply a DC bias voltage V 1 to the upper sub-modulator, the bias angle is And applying a DC bias voltage V 2 to the lower sub-modulator, wherein the DC bias voltage V 2 is related to the upper sub-modulator, and the bias angle isAnd is also provided withApplying a fixed direct-current bias voltage V 3 to the main modulator to enable the field intensity of the optical signals of the upper path and the lower path to generate a 180-degree phase difference, and outputting a modulated optical signal;
The photodetector is configured to perform square rate detection, realize beating between the optical carrier and sidebands thereof, and recover the outgoing frequency signal.
The invention has the beneficial effects that:
1. The invention constructs the mutually offset distortion signals by controlling the single bias point and the optical power distribution ratio of the double parallel Mach-Zehnder modulator, so that the microwave photon link can adapt to the application scene of ultra-wideband and narrow-band large dynamics and can flexibly reconstruct two working modes. In the invention, the upper sub-modulator and the lower sub-modulator of the double parallel Mach-Zehnder modulator adopt the bias voltages which are related to each other, the main modulator adopts the fixed direct current bias voltage, and the ultra-wideband and narrow-band large dynamic working modes can be respectively realized only by regulating and controlling a single bias point and regulating and controlling the optical power distribution ratio, so that the reconstruction of the two modes is flexible, and the regulating and controlling difficulty of the system is greatly simplified.
2. The invention has the advantages of no need of complex hardware constitution, simple structure, great reduction of the volume and weight of the microwave photon link, and further reduction of the hardware scale and meeting of the compact installation environment requirement by carrying out multi-channel integration on the microwave photon link.
In summary, compared with the existing microwave photon link, the invention has the characteristics of simple structure and easy regulation, and can realize the inhibition of third-order intermodulation distortion/second harmonic distortion by regulating and controlling the optical power distribution ratio and one bias control point of the double-parallel Mach-Zehnder modulator, so that the microwave photon link has two working modes of narrow-band large dynamic and ultra-wide band, and the two working modes can be quickly reconstructed, thereby meeting the requirements of different application scenes.
Drawings
Fig. 1 is a schematic diagram of a bandwidth-adaptive and dynamic range-reconfigurable microwave photonic link apparatus according to embodiment 1 of the present invention.
Fig. 2 is a schematic diagram of the spectrum and the electricity spectrum in the narrow-band large dynamic mode in the embodiment 2 of the present invention.
FIG. 3 is a schematic diagram of the spectrum and the electric spectrum in the ultra wideband mode in the embodiment 3 of the present invention.
FIG. 4 is a comparison of the third order spurious free dynamic range in the narrow band large dynamic mode of example 2 of the present invention with the third order spurious free dynamic range of the prior MZM-based microwave photon link.
Fig. 5 shows the second order spurious free dynamic range and the third order spurious free dynamic range of the link in ultra wideband mode in embodiment 3 of the present invention.
Reference numerals are MZM is a Mach-Zehnder modulator, DPMZM is a double-parallel Mach-Zehnder modulator, MZM1 is an upper sub-modulator, MZM2 is a lower sub-modulator, MZM3 is a main modulator, bias1, bias2 and bias3 are bias voltage control points applied to the MZM1, the MZM2 and the MZM respectively, IMD2 is second-order intermodulation distortion, IMD3 is third-order intermodulation distortion, SFRD2 is second-order spurious-free dynamic range and SFRD is third-order spurious-free dynamic range.
Detailed Description
Specific embodiments of the present invention will now be described in order to provide a clearer understanding of the technical features, objects and effects of the present invention. It should be understood that the particular embodiments described herein are illustrative only and are not intended to limit the invention, i.e., the embodiments described are merely some, but not all, of the embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present invention.
Example 1
As shown in fig. 1, the present embodiment provides a bandwidth-adaptive and dynamic range-reconfigurable microwave photon link, which includes a laser, a dual parallel mach-zehnder modulator, a bias control unit, and a photodetector. The dual parallel Mach-Zehnder modulator comprises an upper sub-modulator, a lower sub-modulator and a main modulator, wherein the upper sub-modulator and the lower sub-modulator are connected in parallel and work in a push-pull state, the upper sub-modulator and the lower sub-modulator are respectively positioned on two arms of the main modulator, the bias control unit applies direct current voltage to the upper sub-modulator, the lower sub-modulator and the main modulator and controls the direct current voltage to work on a target working point, and the photoelectric detector is configured to perform square rate detection, realize beat between the optical carrier and sidebands thereof and recover an emergent frequency signal.
Correspondingly, the embodiment also provides a method for realizing the microwave photon link with reconfigurable adaptive bandwidth and dynamic range, which comprises the following steps:
generating an optical carrier wave through a laser and injecting the optical carrier wave into a double-parallel Mach-Zehnder modulator, dividing the input end of the double-parallel Mach-Zehnder modulator into two beams with adjustable proportion, and respectively injecting the two beams into an upper sub-modulator and a lower sub-modulator of the double-parallel Mach-Zehnder modulator, wherein the upper sub-modulator and the lower sub-modulator are connected in parallel and work in a push-pull state;
Applying a radio frequency signal to the upper sub-modulator to modulate the injected optical carrier;
The bias control unit applies direct-current bias voltage V 1 to the upper sub-modulator, the bias angle is And applying a DC bias voltage V 2 to the lower sub-modulator, wherein the DC bias voltage V 2 is related to the upper sub-modulator, and the bias angle isAnd is also provided withThe embodiment adopts a bias control mode which is related to each other, so that the simultaneous fine control of a plurality of direct current bias voltages can be avoided, and the difficulty of bias control is greatly simplified;
The bias control unit applies a fixed direct-current bias voltage V 3 to the main modulator to enable the field intensity of the optical signals of the upper path and the lower path to generate a 180-degree phase difference, and the modulated optical signals are output.
After the modulated optical signals output by the double parallel Mach-Zehnder modulators are transmitted, square rate detection and photoelectric conversion can be performed through the photoelectric detector, and the emergent frequency signals can be recovered. The recovered radio frequency signal and various distortions thereof are essentially generated by mutually beating frequencies among the optical carrier, the optical sidebands and superposing photocurrents. In the present embodiment, in the lower sub-modulator of the dual parallel mach-zehnder modulator, an additional phase shift is introduced to the optical carrier and coherently synthesized with the upper modulated optical signal, so that the optical detection signal includes both the photocurrent generated by the optical sideband of the upper sub-modulator and the optical carrier self-timer frequency and the photocurrent generated by the mutual timer frequency between the optical sideband of the upper sub-modulator and the optical carrier of the lower sub-modulator. The bias voltage applied to the upper sub-modulator is regulated, so that a plurality of distortion components generated by self-timer frequency and mutual timer frequency can be mutually offset, the microwave photon link can work in a narrow-band large-dynamic ultra-wideband working mode, and the flexible switching of the two working modes can be realized through the regulation and control of the bias voltage.
Therefore, the reconstruction between the narrow-band large-dynamic working mode and the ultra-wideband working mode in the microwave photon link can be realized by regulating and controlling the optical power distribution ratio and the bias angle applied to the upper sub-modulator, and the control is simple.
It should be noted that, the bandwidth of the microwave photon link is affected by the inherent bandwidth of the device and the cross octave distortion signal, in recent years, the device capability is improved faster, the broadband device is available with strong availability, and the bandwidth improvement of the device is not the key point of the invention. The ultra-wideband refers to that the bandwidth of a link is not limited by a cross-octave distortion signal.
Example 2
This example is based on example 1:
The embodiment provides a method for realizing a microwave photon link with reconfigurable adaptive bandwidth and dynamic range, which is used for realizing a narrow-band large-dynamic working mode.
When the dual-tone signals with the angular frequencies of omega 1 and omega 2 are loaded to the upper sub-modulator, the output spectrum of the dual-parallel Mach-Zehnder modulator is subjected to three-order intermodulation distortion suppression after photoelectric conversion as shown in figure 2. Wherein, the third-order intermodulation distortion with the angular frequency of 2 omega 1-ω2(2ω2-ω1) can be generated by the optical carrier wave and the sideband generated by the upper sub-modulator at the photoelectric detection self-timer frequency, and the generated photocurrent is I 1,I2,I3 respectively, or can be generated by the optical sideband generated by the upper sub-modulator and the optical carrier wave cross-timer frequency generated by the lower sub-modulator, and the generated photocurrent is I 4.
Assume that the bias voltage is applied to the sub-modulator to generate a bias angle ofAnd the bias angle of the lower sub-modulator is set asIs arranged to be connected withInterrelated andAnd simultaneously, the main modulator is biased at the minimum point, so that 180-degree phase difference is generated between the field strengths of the optical signals of the upper path and the lower path. By optimizingThe sum of the I 4 and the I 1,I2,I3 can be equal in amplitude and opposite in phase, so that the third-order intermodulation distortion suppression is realized, the spurious-free dynamic range is improved, and the narrow-band large-dynamic working mode configuration is realized.
Specifically, the implementation method of the microwave photon link in this embodiment may be implemented by the following steps:
(1) The continuous light generated by the laser is injected into the double parallel Mach-Zehnder modulators and divided into two beams with adjustable proportion, and the two beams are respectively input into an upper sub-modulator and a lower sub-modulator.
(2) The radio frequency double-tone signals with angular frequencies of omega 1 and omega 2 are applied to an upper sub-modulator of an upper path to modulate the injected optical carrier, and a lower sub-modulator has no radio frequency input.
(3) The Bias control unit applies Bias voltages to Bias voltage control points Bias1, bias2, bias3 of the dual parallel mach-zehnder modulator, respectively. Applying a DC bias to the upper sub-modulator by a bias control unit, the bias angle of the DC biasA dc bias is applied to the lower sub-modulator in relation to the upper sub-modulator,Wherein, the upper sub-modulator and the lower sub-modulator are both in push-pull working mode.
(4) The main modulator is biased at the minimum point, so that 180-degree phase difference is generated between the field strengths of the optical signals of the upper path and the lower path. The output optical signal may be expressed as:
Wherein, Is an optical carrier electric field, P is optical carrier optical power, omega c is optical carrier angular frequency, alpha is optical carrier optical power distribution ratio of an upper path, m=pi V RF/Vπ is a modulation coefficient, V RF is radio frequency signal amplitude, V π is half-wave voltage of an upper sub-modulator, and a bias angle is providedOffset angle
From the above, the output optical field includes both the optical carrier from the upper sub-modulator, each subharmonic, intermodulation distortion, and the phase-modulated optical carrier from the lower sub-modulator.
(5) The modulated optical signal is input to a photodetector, and the photocurrent I IMD3 generated by the optical carrier and the secondary side band self-beat frequency and the mutual beat frequency and the third-order intermodulation distortion can be expressed as:
Wherein J n (m) is a Bessel function of the first type. The photocurrent generated by the carrier wave of the upper sub-modulator and the beat frequency of the sideband is I 1,I2,I3 respectively, and the photocurrent generated by the beat frequency of the sideband of the upper sub-modulator and the carrier wave of the lower sub-modulator is I 4.
(6) Expanding the Bessel function of the first class, and making the sum of the third-order intermodulation distortions in the above formula be zero, it can be known that the conditions for eliminating the third-order intermodulation distortion are as follows:
There is an optimum offset angle And alpha (0 < alpha < 1), satisfying the optimization conditions of complete suppression of third-order intermodulation distortion and third-order spurious-free dynamic range. There is an optimum α, when α≡0.55, the output signal amplitude is maximum, and the third order spurious free dynamic range is maximum. The third order spurious free dynamic range of the microwave photon link is improved by about 19dB compared with the third order spurious free dynamic range pair of the existing MZM-based microwave photon link, such as shown in figure 4.
Example 3
This example is based on example 1:
The embodiment provides a method for realizing a microwave photon link with reconfigurable adaptive bandwidth and dynamic range, which is used for realizing an ultra-wideband working mode.
When the output spectrum of the double parallel Mach-Zehnder modulator and the second harmonic distortion suppression after photoelectric conversion are applied to the double-tone signals with the upper sub-modulator angular frequencies of omega 1 and omega 2 respectively are shown in figure 3. Wherein, the second harmonic distortion with the angular frequency of 2 omega 1(2ω2) can be generated by the optical carrier wave and the sideband generated by the upper sub-modulator at the photoelectric detection self-timer frequency, and the two main contributors are shared, the generated photocurrent is I '1,I'2 respectively, and the generated photocurrent is I' 3 also can be generated by the optical sideband generated by the upper sub-modulator and the optical carrier wave generated by the lower sub-modulator at the mutual timer frequency. The bias voltage is applied in the same manner as in the above-described large dynamic mode by optimizing the optical power distribution ratio α' andThe sum of the I '1 and the I' 2、I'3 can be equal in amplitude and opposite in phase, so that the second harmonic distortion suppression is completed, and the configuration of the ultra-wideband working mode of the microwave photon link is realized.
Specifically, the implementation method of the microwave photon link in this embodiment may be implemented by the following steps:
(1) The continuous light generated by the laser is injected into the double parallel Mach-Zehnder modulators and divided into two beams with adjustable proportion, and the two beams are respectively input into an upper sub-modulator and a lower sub-modulator.
(2) The radio frequency double-tone signals with angular frequencies of omega 1 and omega 2 are applied to an upper sub-modulator of an upper path to modulate the injected optical carrier, and a lower sub-modulator has no radio frequency input.
(3) The Bias control unit applies Bias voltages to Bias voltage control points Bias1, bias2, bias3 of the dual parallel mach-zehnder modulator, respectively. Applying a DC bias to the upper sub-modulator by a bias control unit, the bias angle of the DC biasA dc bias is applied to the lower sub-modulator in relation to the upper sub-modulator,Wherein, the upper sub-modulator and the lower sub-modulator are both in push-pull working mode.
(4) The main modulator is biased at the minimum point, so that 180-degree phase difference is generated between the field strengths of the optical signals of the upper path and the lower path. The output optical signal may be expressed as:
Wherein, Is an optical carrier electric field, P is optical carrier optical power, omega c is optical carrier angular frequency, alpha is optical carrier optical power distribution ratio of an upper path, m=pi V RF/Vπ is a modulation coefficient, V RF is radio frequency signal amplitude, V π is half-wave voltage of an upper sub-modulator, and a bias angle is providedOffset angle
From the above, the output optical field includes the optical carrier wave from the upper sub-modulator, each subharmonic, intermodulation distortion, and the optical carrier wave from the lower sub-modulator after phase adjustment.
(5) The modulated optical signal is input to a photoelectric detector, and photocurrent generated by optical carrier and sideband auto-beat frequency and mutual beat frequency and second harmonic distortion can be expressed as:
the photocurrent generated by the carrier wave of the upper sub-modulator and the beat frequency of the sideband of the lower sub-modulator is I '1,I'2, and the photocurrent generated by the beat frequency of the sideband of the upper sub-modulator and the carrier wave of the lower sub-modulator is I' 3. Bias angle applied on the lower sub-modulator
(6) Expanding the Bessel function of the first type, and enabling the sum of second harmonic distortion products in the above formula to be zero, wherein the condition for eliminating the second harmonic distortion is as follows:
There is an optimum offset angle And an optical power distribution ratio alpha '(0 < alpha' < 1), satisfying the conditions of complete suppression of second harmonic distortion and optimization of second order spurious-free dynamic range. When a' =1,K=0, ±1,..when the system is used, the second harmonic distortion suppression is strongest, and the ratio of the power of the detection output signal to the third-order intermodulation distortion signal is the largest, namely, the second-order spurious-free dynamic range and the third-order spurious-free dynamic range of the microwave photon link are optimized in an ultra-wideband working mode. At this time, the second-order spurious-free dynamic range and the third-order spurious-free dynamic range of the ultra-wideband microwave photon link are shown in fig. 5.
It should be noted that, for the sake of simplicity of description, the foregoing method embodiments are expressed as a series of combinations of actions, but it should be understood by those skilled in the art that the present application is not limited by the order of actions described, as some steps may be performed in other order or simultaneously according to the present application. Further, those skilled in the art will also appreciate that the embodiments described in the specification are all preferred embodiments, and that the acts and modules referred to are not necessarily required for the present application.
Claims (10)
1. The method for realizing the microwave photon link with the reconfigurable adaptive bandwidth and dynamic range is characterized by comprising the following steps of:
Generating an optical carrier wave through a laser and injecting the optical carrier wave into a double-parallel Mach-Zehnder modulator, dividing the input end of the double-parallel Mach-Zehnder modulator into two beams with adjustable proportion, and respectively injecting the two beams into an upper sub-modulator and a lower sub-modulator of the double-parallel Mach-Zehnder modulator, wherein the upper sub-modulator and the lower sub-modulator are connected in parallel and work in a push-pull state;
Applying a radio frequency signal to the upper sub-modulator to modulate the injected optical carrier;
The bias control unit applies direct-current bias voltage V 1 to the upper sub-modulator, the bias angle is And applying a DC bias voltage V 2 to the lower sub-modulator, wherein the DC bias voltage V 2 is related to the upper sub-modulator, and the bias angle isAnd is also provided with
A fixed direct current bias voltage V 3 is applied to a main modulator of the double parallel Mach-Zehnder modulator through a bias control unit, so that 180-degree phase difference is generated between the field intensities of the optical signals of the upper path and the lower path, and a modulated optical signal is output.
2. The method for implementing a microwave photon link capable of being reconfigured in adaptive bandwidth and dynamic range according to claim 1, wherein after the modulated optical signals output by the double parallel mach-zehnder modulators are transmitted, square rate detection and photoelectric conversion can be performed by a photoelectric detector, so as to recover an outgoing frequency signal.
3. The method for implementing a microwave photonic link with reconfigurable adaptive bandwidth and dynamic range according to claim 1, wherein the expression of the modulated optical signal output by the dual parallel mach-zehnder modulator comprises:
Wherein, Is an optical carrier electric field, P is optical carrier optical power, omega c is optical carrier angular frequency, alpha is optical carrier optical power distribution ratio of an upper path, m=pi V RF/Vπ is a modulation coefficient, V RF is radio frequency signal amplitude, V π is half-wave voltage of an upper sub-modulator, and a bias angle is providedOffset angleOmega 1 and omega 2 are the angular frequencies of the radio frequency signal, which is a two-tone signal.
4. The method for implementing a microwave photon link with reconfigurable adaptive bandwidth and dynamic range according to claim 3, wherein the expression of the photocurrent I IMD3 of the third-order intermodulation distortion generated by the optical carrier, the sideband auto-beat frequency and the cross-beat frequency after the modulated optical signal is input to the photodetector comprises:
Wherein J n (m) is a Bessel function of a first type, photocurrents generated by the optical carrier and the sideband self-beat frequency of the upper sub-modulator are I 1,I2,I3 respectively, and photocurrents generated by the mutual beat frequency of the sideband of the upper sub-modulator and the carrier of the lower sub-modulator are I 4.
5. The method for implementing a microwave photon link capable of being reconfigured in adaptive bandwidth and dynamic range according to claim 4, wherein the conditions for expanding the first Bessel function and enabling the sum of the third-order intermodulation distortions to be zero and eliminating the third-order intermodulation distortion are as follows:
There is an optimum offset angle And the optical power distribution ratio alpha meets the optimization conditions of complete suppression of third-order intermodulation distortion and third-order spurious-free dynamic range.
6. The method for realizing the microwave photon link capable of being reconfigured by adapting bandwidth and dynamic range according to claim 5, wherein the optical power distribution ratio alpha and the offset angle are optimizedThe amplitudes of the sum of the photocurrents I 4 and I 1,I2,I3 are equal and the phases are opposite, and the configuration of the narrow-band large-dynamic-range working mode of the microwave photon link is completed by realizing the optimization of the third-order intermodulation distortion suppression and the third-order spurious-free dynamic range.
7. The method for implementing a microwave photon link capable of reconstructing adaptive bandwidth and dynamic range according to claim 3, wherein generating a photocurrent expression of second harmonic distortion by optical carrier, sideband auto-beat frequency and mutual beat frequency after the modulated optical signal is input to a photodetector comprises:
Wherein J n (m) is Bessel function of the first kind, photocurrents generated by the carrier wave of the upper sub-modulator and the self-beat frequency of the sideband are I ' 1 and I ' 2 respectively, photocurrents generated by the mutual beat frequency of the sideband of the upper sub-modulator and the carrier wave of the lower sub-modulator are I ' 3, and bias angles on the lower sub-modulator are applied
8. The method for implementing a microwave photon link capable of reconstructing adaptive bandwidth and dynamic range according to claim 7, wherein expanding a first Bessel function and making the sum of second harmonic distortion products be zero, and obtaining the condition for eliminating the second harmonic distortion is as follows:
There is an optimum offset angle And an optical power distribution ratio alpha', and satisfies the optimization conditions of complete suppression of second harmonic distortion and second-order spurious-free dynamic range.
9. The method for realizing the microwave photon link capable of being reconfigured by adapting bandwidth and dynamic range according to claim 8, wherein the optical power distribution ratio alpha' and the offset angle are optimizedThe sum of the photocurrents I 1 ' and I ' 2、I3 ' has the same amplitude and opposite phases, so that the second harmonic distortion suppression and the optimization of the second-order spurious-free dynamic range are realized, and the configuration of the ultra-wideband working mode of the microwave photon link is completed.
10. The microwave photon link is characterized by comprising a laser, a double parallel Mach-Zehnder modulator, a bias control unit and a photoelectric detector, wherein the double parallel Mach-Zehnder modulator comprises an upper sub-modulator, a lower sub-modulator and a main modulator, the upper sub-modulator and the lower sub-modulator are connected in parallel and work in a push-pull state, and the upper sub-modulator and the lower sub-modulator are respectively positioned on the upper arm and the lower arm of the main modulator;
the laser generates an optical carrier wave and is injected into a double parallel Mach-Zehnder modulator, the input end of the double parallel Mach-Zehnder modulator is divided into two beams with adjustable proportion, and the two beams are respectively injected into an upper sub-modulator and a lower sub-modulator;
The bias control unit is configured to apply a DC bias voltage V 1 to the upper sub-modulator, the bias angle is And applying a DC bias voltage V 2 to the lower sub-modulator, wherein the DC bias voltage V 2 is related to the upper sub-modulator, and the bias angle isAnd is also provided withApplying a fixed direct-current bias voltage V 3 to the main modulator to enable the field intensity of the optical signals of the upper path and the lower path to generate a 180-degree phase difference, and outputting a modulated optical signal;
The photodetector is configured to perform square rate detection, realize beating between the optical carrier and sidebands thereof, and recover the outgoing frequency signal.
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