WO2018176518A1 - 相参光子模数转换装置 - Google Patents

相参光子模数转换装置 Download PDF

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WO2018176518A1
WO2018176518A1 PCT/CN2017/080975 CN2017080975W WO2018176518A1 WO 2018176518 A1 WO2018176518 A1 WO 2018176518A1 CN 2017080975 W CN2017080975 W CN 2017080975W WO 2018176518 A1 WO2018176518 A1 WO 2018176518A1
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photon
sampling
source
module
digital conversion
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PCT/CN2017/080975
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French (fr)
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邹卫文
杨光
于磊
钱娜
陈建平
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上海交通大学
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Priority to US16/513,346 priority Critical patent/US10649308B2/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F7/00—Optical analogue/digital converters
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
    • H01S3/1068—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using an acousto-optical device
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/0075—Arrangements for synchronising receiver with transmitter with photonic or optical means
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/02—Speed or phase control by the received code signals, the signals containing no special synchronisation information
    • H04L7/033—Speed or phase control by the received code signals, the signals containing no special synchronisation information using the transitions of the received signal to control the phase of the synchronising-signal-generating means, e.g. using a phase-locked loop
    • H04L7/0331—Speed or phase control by the received code signals, the signals containing no special synchronisation information using the transitions of the received signal to control the phase of the synchronising-signal-generating means, e.g. using a phase-locked loop with a digital phase-locked loop [PLL] processing binary samples, e.g. add/subtract logic for correction of receiver clock
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/145—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue
    • A61B5/1455—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue using optical sensors, e.g. spectral photometrical oximeters
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/145—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue
    • A61B5/1455—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue using optical sensors, e.g. spectral photometrical oximeters
    • A61B5/14551—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue using optical sensors, e.g. spectral photometrical oximeters for measuring blood gases
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/35—Non-linear optics
    • G02F1/3526—Non-linear optics using two-photon emission or absorption processes
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/10—Calibration or testing
    • H03M1/1071—Measuring or testing
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/12—Analogue/digital converters

Definitions

  • the invention relates to an optical information processing technology, in particular to a coherent photon analog-to-digital conversion device, which realizes high-precision acquisition of a radio frequency signal or an optical signal.
  • Photon sampling technology has important applications in high-speed signal processing and conversion, high-resolution measurement equipment, and optical signal quality detection.
  • high-performance photon sampling technology is in the stage of rapid development.
  • the two main development directions are ultra-high sampling rate and ultra-high precision.
  • the wavelength division multiplexing/time division multiplexing scheme of the optical clock of the mode-locked laser can achieve double sampling rate and high sampling rate, and has strong stability, low clock jitter, and low quantization rate of electrical processing.
  • Features are therefore considered the best solution for optical analog to digital conversion.
  • a passive mode-locked laser is generally selected as the seed source.
  • the passive mode-locked laser has a lower re-frequency, and the high-rate optical sampling clock requires more multiplexing channels, which tends to result in a larger structure and more stringent requirements for channel matching accuracy.
  • the noise characteristics of active mode-locked lasers have been able to reach a low level.
  • Low-jitter active mode-locked lasers are used as the light source, which can be improved by a small number of complex high-frequency characteristics.
  • a high-quality ultra-high-speed optical sampling clock is obtained by using a channel, which is of great significance for improving the performance index of the optical analog-to-digital conversion system and optimizing the system scheme.
  • phase-locking technology is an effective means to achieve coherent. By locking the frequency and phase of the controlled signal and the reference signal, their frequency and phase remain fixed, which reduces the clock jitter and improves the stability of the system.
  • the phase-locking technology mainly includes the following:
  • a photon phase detector composed of a crystal having a frequency doubling effect can measure the phase shift between the signals at the transmitting and receiving ends and perform feedback, and the photon phase detector and the photoelectric locking system based on the harmonic crystal ( J.Kim, JACox, Chen J, FX Drift-free femtosecond timing synchronization of remote optical and microwave sources. Nature Photonics, 2008, 2: 733-736.)
  • the all-fiber structure is adopted, the stability of the system is high, and the phase detector adopts a balanced structure, which effectively eliminates Noise introduced by channel imbalance.
  • the phase-locking technology based on nonlinear crystal has obvious shortcomings.
  • the system structure is complex and difficult to integrate. At the same time, the performance and stability of the nonlinear crystal are greatly affected by the environment, which limits the applicable environment of the system.
  • Another photoelectric phase-locked phase-based technology based on microwave photonic devices the most direct method of this technology is to convert the optical signal into an electrical signal, and then use the phase-locked loop for phase-locking, that is, only in the RF mixing
  • the front stage of the device plus PD is an optical phase detector based on a radio frequency mixer.
  • the technology is suitable for locking optical signals and electrical signals and locking between optical signals, and has the advantages of simple principle and low implementation cost.
  • due to the bandwidth limitation of the RF mixer it cannot be applied to high-frequency, high-bandwidth systems, and the system noise is large.
  • the object of the present invention is to provide a phase-coupled photon analog-to-digital conversion device in view of the deficiencies of the prior art.
  • the device adjusts the optical clock oscillation source or the sampled signal source to make it highly correlated, thereby reducing clock jitter and greatly improving sampling accuracy.
  • a phase-coupled photon analog-to-digital conversion device comprising: an optical clock oscillation source, a photon sampling gate, a sampled signal source, a photoelectric detection module, an electrical sampling module, a phase detection module, a loop filter, and a first signal feedback Link and second signal feedback link:
  • the first output end of the optical clock oscillation source is connected to the first input end of the photon sampling gate, An output end of the sampled signal source is connected to a second input end of the photon sampling gate, and an output end of the photon sampling gate is connected to an input end of the photodetecting module, and the photodetection
  • the output end of the module is divided into two: one is connected to the electric sampling module, the other is connected to the first input end of the phase detecting module, and the second output end of the optical clock oscillation source is a second input end of the phase detecting module is connected, an output end of the phase detecting module is connected to an input end of the loop filter, and an output end of the loop filter is subjected to a first signal feedback link
  • locking the optical clock oscillation source is realized, and the output end of the loop filter is input through the second signal feedback link and the sampled signal source When the terminals are connected, the locking of the sampled signal source is realized.
  • the optical clock oscillation source is a passive mode-locked laser, an active mode-locked laser or a modulation frequency comb.
  • the sampled signal source is a voltage controlled oscillator, a frequency multiplex source, a passive mode-locked laser, an active mode-locked laser or a modulated frequency comb.
  • the photon sampling gate is a lithium niobate electro-optic modulator, a polymer electro-optic modulator, a silicon-based integrated electro-optic modulator, a spatial light modulator, a photonic crystal fiber or a highly nonlinear fiber.
  • the photodetection module is a PIN tube or an APD tube.
  • the electrical sampling module is an oscilloscope or an information processing board.
  • the phase detection module is a radio frequency mixer for generating a desired mixing signal.
  • the loop filter is an RF low pass filter.
  • the first signal feedback link and the second signal feedback link are power amplifiers or PID servers.
  • the present invention has the following advantages:
  • electro-optic photon sampling gate or all-optical photon sampling gate to realize coherent photon analog-to-digital conversion and complete signal sampling and coherent locking, which can complete the coherent locking of electro-optic oscillation source and optical oscillation source, thus realizing electric signal and Acquisition of optical signals.
  • FIG. 1 is a block diagram of an embodiment of a coherent photon analog-to-digital conversion device of the present invention
  • Figure 3 is a comparison of conventional sampling and coherent sampling spectrum of the present invention.
  • Figure 4 shows the relationship between the effective bit number and the analog input bandwidth of the present invention.
  • the phase-coupled photon analog-to-digital conversion device of the present invention comprises an optical clock oscillation source 1, a photon sampling gate 3, and a sampled signal source 4
  • the first output end of the optical clock oscillation source 1 is connected to the first input end of the photon sampling gate 3, and the output end of the sampled signal source 4 and the second end of the photon sampling gate 3
  • the output end of the photon sampling module 3 is connected to the input end of the photodetecting module 5, and the output end of the photodetecting module 5 is divided into two: one way and the electric sampling module 7 is connected, the other is connected to the first input end of the phase detecting module 9, and the second output end of the optical clock oscillation source 1 is connected to the second input end of the phase detecting module 9
  • the output end of the phase detecting module 9 is connected to the input end of the loop filter 10, and the output end of the loop filter 10 passes through the first signal feedback link 11 and the optical clock oscillation source 1 When the input ends are connected, locking of the optical clock oscillation source is realized, and the output end of the loop filter 10 is connected to the input end of the sampled signal source 4 via the second signal feedback link 12 Lock on the sampled source.
  • the optical clock oscillation source 1 is used to generate the optical sampling clock signal 2, and the photon sampling gate 3 loads the electrical signal or optical signal to be sampled by the sampling signal source 4 to the optical clock signal 2, and the obtained result is converted by the photoelectric detecting module 5.
  • the converted electrical signal is divided into two paths, one through the electrical sampling module 7 to achieve the acquisition of the sampled signal; on the other hand, the optical clock oscillation source 1 can generate a synchronous reference output signal 8 through photoelectric conversion,
  • the reference output signal 8 and the other signal of the electrical signal 6 are phase-detected by the phase detecting module 9, and the obtained mixed signal is filtered by the loop filter 10 to filter out high-frequency components, and the optical signal is realized by the first signal feedback link 11.
  • the phase-locking of the oscillating source 1 or the phase-locking of the sampled signal source 4 is effected by the second signal feedback link 12, thereby achieving phase-parametric sampling.
  • the photon sampling gate 3 can be used to realize the sampling of the optical signal by the optical clock.
  • the current optical clock samples the electrical signal.
  • FIG. 2 is a result of clock jitter test before and after phase locking of the system of the present invention
  • FIG. 3 is a comparison between conventional sampling and the coherent sampling spectrum of the present invention
  • FIG. 4 shows the effective bit number of the present invention.
  • the phased locking device locks the sampled optical clock signal source and the signal source to achieve phase-parametric sampling, thereby reducing clock jitter and improving sampling accuracy. This plays a key role in improving the performance of microwave photonic systems that require high time accuracy and high sampling accuracy, such as microwave photonic radar and optical communication systems.

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  • Engineering & Computer Science (AREA)
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Abstract

一种相参光子模数转换装置，包括光时钟振荡源（1）、被采样信号源（4）、光子采样门（3）、光电探测模块（5）、电采样模块（7）、相位检测模块（9）、环路滤波器（10）和信号反馈链路（11，12）。通过调整光时钟振荡源（1）或者被采样信号源（4），使之高度相参，进而降低时钟抖动，大大提高了采样精度。这对于提升微波光子雷达和光通信系统等需要高时间精度、高采样精度的微波光子系统的性能，具有十分关键的作用。

Description

相参光子模数转换装置 技术领域
本发明涉及光信息处理技术，特别是一种相参光子模数转换装置，实现对射频信号或光学信号的高精度采集。
背景技术
光子采样技术在高速的信号的处理与转换、高分辨率测量设备以及光信号质量检测等领域有着重要的应用。当前，高性能光子采样技术正处在飞速发展的阶段，两个主要发展方向分别是超高采样率与超高精度。从高采样率方面考虑，通过锁模激光器光时钟的波分复用/时分复用方案可以实现采样率倍增，提高采样率，同时具有稳定性强，时钟抖动低，电处理量化速率较低的特点，因此被视为光模数转换的最佳方案。在当前报道研究中，出于低噪特性的考虑，一般选取被动锁模激光器作为种子光源。然而，被动锁模激光器重频较低，得到高速率光采样时钟需要较多复用通道数，往往会导致结构比较庞大，同时对通道匹配的精度提出了更严苛的要求。随着主动锁模激光器技术的发展，目前主动锁模激光器的噪声特性已经能够达到较低水平，采用低抖动主动锁模激光器作为光源，可以在其高重频特点的优势上，仅通过少量复用通道就获得高质量超高速光采样时钟，这对提高光模数转换系统性能指标，优化系统方案具有重大意义。
然而，时钟抖动是制约光子采样精度的重大因素，因此如何降低光采样时钟与被采样信号源之间的时钟抖动是提升光子采样系统性能面临的问题。为了消除光采样时钟的和待采样信号之间的相对时钟抖动，需要提高两者之间的相参性。其中一类技术是基于同一高稳定光源来同时产生相参的信号和采样时钟，此时的PADC分辨率极限将取决于该光源本身的时钟抖动。然而，在实际应用中，更广泛的情况是待采样信号与采样时钟均从不同信号源中产生。因此，我们需要实现不同电子、光子信号源之间的高性能相参。锁相技术是实现相参的有效手段，通过将受控信号与参考信号的频率与相位锁定，使得它们的频率与相位保持固定的关系，进而降低时钟抖动提高系统的稳定性。
相参锁相技术主要包括以下几种：
一种是基于光学非线性效应的光电鉴相锁相技术(J.Kim,J.A.Cox,Chen J,F.X.
Figure PCTCN2017080975-appb-000001
Drift-free femtosecond timing synchronization of remote optical and microwave sources.Nature Photonics,2008,2:733-736.)，目前已经研制出多种非线性光学晶体，其中具有倍频效应(SHG)与和频效应的晶体在光学相位检测中有很大的应用前景。在长距离光纤传输系统中，使用具有倍频效应的晶体构成的光子鉴相器，能够测量收发端信号间的相位偏移并进行反馈，基于和频晶体的光子鉴相器与光电锁定系统(J.Kim,J.A.Cox,Chen J,F.X.
Figure PCTCN2017080975-appb-000002
Drift-free femtosecond timing synchronization of remote optical and microwave sources.Nature Photonics,2008,2:733-736.)采用了全光纤结构，系统的稳定性高，并且该鉴相器采用了平衡结构，有效消除了通道失衡引入的噪声。但是基于非线性晶体的锁相技术有明显的缺点，系统结构复杂，难以集成化，同时，非线性晶体的性能和稳定性受环境影响大，使系统的适用环境受到限制。
另一种基于微波光子器件的光电鉴相锁相技术，这种技术最直接的方法就是将光信号转换为电信号，然后使用电锁相环进行鉴相锁相，即只需在射频混频器的前级加上PD，就是一种基于射频混频器的光电鉴相器。该技术适用于光信号与电信号的锁定以及光信号之间的锁定，其原理简单，实现成本低。但是受射频混频器的带宽限制，无法应用在高频、高带宽的系统中，且系统噪声较大。
然而，现存的光子采样技术和相参锁定技术虽然被广泛研究，而结合两者的采样方法还没有被研究，因此我们提出了一种相参光子模数转换方法。
发明内容
本发明的目的在于针对现有技术的不足，提出一种相参光子模数转换装置。该装置通过调整光时钟振荡源或者被采样信号源，使之高度相参，进而降低时钟抖动，大大提高了采样精度。
本发明的技术解决方案如下：
一种相参光子模数转换装置，其特点在于，包括光时钟振荡源、光子采样门、被采样信号源、光电探测模块、电采样模块、相位检测模块、环路滤波器、第一信号反馈链路和第二信号反馈链路：
所述的光时钟振荡源的第一输出端与所述的光子采样门的第一输入端相连， 所述的被采样信号源的输出端与所述的光子采样门的第二输入端相连，所述的光子采样门的输出端与所述的光电探测模块的输入端相连，所述的光电探测模块的输出端一分为二：一路与所述的电采样模块相连，另一路与所述的相位检测模块的第一输入端相连，所述的光时钟振荡源的第二输出端与所述的相位检测模块的第二输入端相连，所述的相位检测模块的输出端与所述的环路滤波器的输入端相连，所述的环路滤波器的输出端经第一信号反馈链路与所述的光时钟振荡源的输入端相连时，实现对光时钟振荡源的锁定，所述的环路滤波器的输出端经第二信号反馈链路与所述的被采样信号源的输入端相连时，实现对被采样信号源的锁定。
所述的光时钟振荡源为被动锁模激光器、主动锁模激光器或调制频率梳。
所述的被采样信号源为压控振荡器、频综源、被动锁模激光器、主动锁模激光器或调制频率梳。
所述的光子采样门为铌酸锂电光调制器、聚合物电光调制器、硅基集成电光调制器、空间光调制器、光子晶体光纤或高非线性光纤。
所述的光电探测模块为PIN管或APD管。
所述的电采样模块为示波器或信息处理板卡。
所述的相位检测模块为射频混频器，用于产生所需的混频信号。
所述的环路滤波器为射频低通滤波器。
所述的第一信号反馈链路、第二信号反馈链路为功率放大器或PID伺服器。
基于以上技术特点，本发明具有以下优点：
1、采用电光光子采样门或者全光光子采样门，实现相参光子模数转换同时完成信号采样与相参锁定，能完成电光振荡源和光光振荡源的相参锁定，从而实现对电信号和光学信号的采集。
2、将采样后信号与采样时钟源参考输出的相位误差信息反馈至光时钟振荡源或被采样信号源，提升光采样时钟与被采样信号源之间的相参性，可以突破时钟抖动理论极限，提高系统采样精度。
附图说明
图1为本发明相参光子模数转换装置的一个实施例的框图
图2为本发明系统相参锁定前后的时钟抖动测试结果
图3为传统采样与本发明相参采样频谱对比
图4给出了本发明有效比特位数与模拟输入带宽关系曲线
具体实施方式
下面结合附图和实施例对本发明作详细说明，但本发明的保护范围不限于下述的实施例。
图1是本发明相参光子模数转换装置的一个实施例的框图，由图可见，本发明相参光子模数转换装置，包括光时钟振荡源1、光子采样门3、被采样信号源4、光电探测模块5、电采样模块7、相位检测模块9、环路滤波器10、第一信号反馈链路11和第二信号反馈链路12：
所述的光时钟振荡源1的第一输出端与所述的光子采样门3的第一输入端相连，所述的被采样信号源4的输出端与所述的光子采样门3的第二输入端相连，所述的光子采样门3的输出端与所述的光电探测模块5的输入端相连，所述的光电探测模块5的输出端一分为二：一路与所述的电采样模块7相连，另一路与所述的相位检测模块9的第一输入端相连，所述的光时钟振荡源1的第二输出端与所述的相位检测模块9的第二输入端相连，所述的相位检测模块9的输出端与所述的环路滤波器10的输入端相连，所述的环路滤波器10的输出端经第一信号反馈链路11与所述的光时钟振荡源1的输入端相连时，实现对光时钟振荡源的锁定，所述的环路滤波器10的输出端经第二信号反馈链路12与所述的被采样信号源4的输入端相连时，实现对被采样信号源的锁定。
光时钟振荡源1用于产生光采样时钟信号2，光子采样门3将被采样信号源4产生的待采样的电信号或者光信号加载至光时钟信号2，得到的结果经过光电探测模块5转换为电信号6，转换的电信号分为两路，一路经过电采样模块7实现对被采样信号的采集；另一方面，光时钟振荡源1可以通过光电转换产生同步的参考输出信号8，该参考输出信号8与电信号6的另一路信号通过相位检测模块9进行相位检测，得到的混频信号通过环路滤波器10滤除高频分量，通过第一信号反馈链路11实现与光时钟振荡源1的相参锁定，或者通过第二信号反馈链路12实现与被采样信号源4的相参锁定，从而实现相参采样。
上述过程中利用光子采样门3既可以实现光时钟对光信号的采样也可以实 现光时钟对电信号的采样。请参见图2、3、4，图2为本发明系统相参锁定前后的时钟抖动测试结果，图3为传统采样与本发明相参采样频谱对比，图4给出了本发明有效比特位数与模拟输入带宽关系曲线，此外，上述过程中通过相位锁定装置将采样光时钟信号源与被采信号源锁定，实现相参采样进而减小了时钟抖动，提高了采样精度。这对于提升微波光子雷达和光通信系统等需要高时间精度、高采样精度的微波光子系统的性能，具有十分关键的作用。

Claims (9)

  1. 一种相参光子模数转换装置，其特征在于，包括光时钟振荡源(1)、光子采样门(3)、被采样信号源(4)、光电探测模块(5)、电采样模块(7)、相位检测模块(9)、环路滤波器(10)、第一信号反馈链路(11)和第二信号反馈链路(12)：
    所述的光时钟振荡源(1)的第一输出端与所述的光子采样门(3)的第一输入端相连，所述的被采样信号源(4)的输出端与所述的光子采样门(3)的第二输入端相连，所述的光子采样门(3)的输出端与所述的光电探测模块(5)的输入端相连，所述的光电探测模块(5)的输出端一分为二：一路与所述的电采样模块(7)相连，另一路与所述的相位检测模块(9)的第一输入端相连，所述的光时钟振荡源(1)的第二输出端与所述的相位检测模块(9)的第二输入端相连，所述的相位检测模块(9)的输出端与所述的环路滤波器(10)的输入端相连，所述的环路滤波器(10)的输出端经第一信号反馈链路(11)与所述的光时钟振荡源(1)的输入端相连时，实现对光时钟振荡源的锁定，所述的环路滤波器(10)的输出端经第二信号反馈链路(12)与所述的被采样信号源(4)的输入端相连时，实现对被采样信号源的锁定。
  2. 根据权利要求1所述的相参光子模数转换装置，其特征在于，所述的光时钟振荡源(1)为被动锁模激光器、主动锁模激光器或调制频率梳。
  3. 根据权利要求1所述的相参光子模数转换装置，其特征在于，所述的被采样信号源(4)为压控振荡器、频综源、被动锁模激光器、主动锁模激光器或调制频率梳。
  4. 根据权利要求1所述的相参光子模数转换装置，其特征在于，所述的光子采样门(3)为铌酸锂电光调制器、聚合物电光调制器、硅基集成电光调制器、空间光调制器、光子晶体光纤或高非线性光纤。
  5. 根据权利要求1所述的相参光子模数转换装置，其特征在于，所述的光电探测模块为PIN管或APD管。
  6. 根据权利要求1所述的相参光子模数转换装置，其特征在于，所述的电采样模块(7)为示波器或信息处理板卡。
  7. 根据权利要求1所述的相参光子模数转换装置，其特征在于，所述的相位检测模块(10)为射频混频器，用于产生所需的混频信号。
  8. 根据权利要求1所述的相参光子模数转换装置，其特征在于，所述的环路滤波器(10)为射频低通滤波器。
  9. 根据权利要求1所述的相参光子模数转换装置，其特征在于，所述的第一信号反馈链路、第二信号反馈链路为功率放大器或PID伺服器。
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