WO2022174656A1 - 一种相干检测方法、装置及系统 - Google Patents
一种相干检测方法、装置及系统 Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/613—Coherent receivers including phase diversity, e.g., having in-phase and quadrature branches, as in QPSK coherent receivers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
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- H—ELECTRICITY
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- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/54—Intensity modulation
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- H—ELECTRICITY
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- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/548—Phase or frequency modulation
- H04B10/556—Digital modulation, e.g. differential phase shift keying [DPSK] or frequency shift keying [FSK]
- H04B10/5561—Digital phase modulation
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- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/614—Coherent receivers comprising one or more polarization beam splitters, e.g. polarization multiplexed [PolMux] X-PSK coherent receivers, polarization diversity heterodyne coherent receivers
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- H04B10/615—Arrangements affecting the optical part of the receiver
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- H—ELECTRICITY
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- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/615—Arrangements affecting the optical part of the receiver
- H04B10/6151—Arrangements affecting the optical part of the receiver comprising a polarization controller at the receiver's input stage
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- H04B10/60—Receivers
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Definitions
- the present application relates to the field of optical fiber communication, and in particular, to a coherent detection method, device and system.
- the homodyne detection system requires that the frequency of the signal light and the laser source of the local oscillator be the same.
- the advantage is that the bandwidth requirement of the device is low, but it needs to use two pairs of balanced detectors at the receiving end to recover the baseband signal, which greatly increases the equipment. cost.
- the signal light and the local oscillator light are divided into two paths after passing through a 90° mixer and sent to two pairs of balanced detectors respectively. In-phase component and quadrature component.
- 1 is a schematic diagram of a phase diversity homodyne receiving system
- 5b is a second schematic block diagram of a coherent detection system provided by an embodiment of the present application.
- FIG. 6 is a signal mapping constellation diagram of a four-level pulse amplitude modulation signal (PAM4) provided by an embodiment of the present application;
- PAM4 pulse amplitude modulation signal
- FIG. 7 is a schematic diagram of a local oscillator optical phase modulation method and a signal IQ component receiving method provided by an embodiment of the present application;
- FIG. 8 is a schematic diagram of a suboptimal local oscillator optical phase modulation method provided by an embodiment of the present application.
- the step S101 may further include: before adjusting the polarization state, adjusting the received optical power of the intensity-modulated optical signal transmitted by the transmitting end.
- two polarization beam splitters can also be used to perform polarization diversity on the intensity-modulated optical signal and the phase-modulated local oscillator optical signal respectively, so that the same
- the intensity-modulated optical signal of the polarization state and the phase-modulated local oscillator optical signal are detected coherently. That is, both the polarization controller and the first and second polarization beam splitters are used to keep the polarization states of the intensity-adjusted optical signal and the phase-modulated local oscillator optical signal consistent.
- the signal recovery module includes a set of devices, namely an optical coupler, a balanced detector, Analog-to-digital converters and digital signal receivers.
- the method and device for coherent detection provided by the above embodiments of the present invention are applied to the receiving end.
- phase modulating the local oscillator optical signal By phase modulating the local oscillator optical signal, the homodyne detection of phase diversity is avoided, and the signal can be obtained only by a pair of balanced detectors.
- the IQ component reduces the cost of system equipment.
- the intensity modulated optical signal is used to avoid the subsequent carrier recovery algorithm and reduce the system complexity.
- an embodiment of the present invention also provides a coherent detection system for the above-mentioned coherent detection method, the system includes a transmitter and a receiver, wherein: the transmitter is configured to perform intensity modulation on the original signal to obtain Intensity modulated optical signal; the receiving end includes the aforementioned coherent detection device, which will not be repeated here.
- the coherent detection method and system avoid the use of phase diversity by modulating the local oscillator signal by phase, and only need a pair of balanced detectors to obtain the I component and the Q component of the signal, reducing the The cost of system equipment is reduced, and the intensity modulated optical signal is used to avoid the subsequent carrier recovery algorithm and reduce the system complexity.
- Fig. 5a is a first schematic block diagram of a coherent detection system provided by an embodiment of the present application.
- the coherent detection system based on phase-modulated local oscillator light includes: an electro-absorption light modulated laser (or called electro-absorption optical modulator, intensity modulator, Electroabsorption Modulated distributed feedback Laser, EML), a distributed feedback laser (Distributed Feedback Laser, DFB), pulse signal generator, balanced detector (or called balanced receiver, Blanced Photodiode, BPD), polarization controller (Polarization Controller, PC), phase modulator (Phase Modulator, PM), adjustable electrical delay line ( ⁇ ), analog-to-digital converter (ADC), digital signal receiving module (equivalent to In the aforementioned digital signal receiver), single mode fiber (Single Mode Optical Fiber, SSMF), adjustable optical attenuator (or called optical attenuator, Variable Optical Attenuator, VOA), optical coupler (Optical Coupler, OC
- the pulse signal generator At the transmitting end, the pulse signal generator generates a four-level pulse amplitude modulation (4Pulse Amplitude Modulation, PAM4) pulse signal, which drives the electro-absorption optical modulator for intensity modulation, and the output light wave signal after intensity modulation is transmitted by a single-mode fiber Or back to back (B2B) transmission.
- PAM4 Pulse Amplitude Modulation
- the following uses the optical communication simulation software to verify the homodyne detection system of the phase-modulated local oscillator light using the PAM4 modulation format in this embodiment.
- the center wavelength of the electro-absorption optical modulation laser used in the simulation is 1550nm and the line width is 1MHz.
- the center wavelength of the distributed feedback laser used is 1550nm and the line width is 1MHz.
- the center wavelength of the electro-absorption optical modulator can be tuned to simulate the frequency shift between the signal light and the local oscillator light.
- the local oscillator light is obtained by phase modulation after the light wave signal is generated by the distributed feedback laser, and the phase modulator is driven by a binary pulse signal with a frequency of 25 GHz, so that the two levels of the pulse signal correspond to 0° phase modulation respectively. and 90° phase modulation.
- the modulation phase of the LO is 90°
- the balanced detector corresponds to the in-phase component of the output signal
- the modulation phase is 0°
- the balanced detector corresponds to the quadrature component of the output signal.
- the specific phase modulation method of the local oscillator light by the receiving end can be as shown in FIG. 7 , that is, ideally, the modulation frequency of the phase modulation of the local oscillator light is the same as the symbol rate of the signal, and it presents the same appearance as the received symbol.
- the interleaved form specifically, changes the modulation phase of the local oscillator light at the middle moment of each symbol period.
- the balanced detector will output the in-phase component and quadrature component of each symbol in the order of IQQI in the figure, and receive the signal in this order to recover the complete symbol.
- the use of the adjustable electrical delay line is to ensure that the phase modulation of the local oscillator is exactly half a symbol period staggered from the received symbol.
- the 90° phase modulation period of the LO corresponds to the first half cycle of the first and third symbols and the second half cycle of the second symbol
- the 0° phase modulation period corresponds to the second half cycle of the first and third symbols and the first half cycle of the second symbol. Therefore, the in-phase and quadrature components of the three symbols should be extracted in the order of IQQIIQ.
- the final output signal is in the form of IQQI recurring, and the two components of each symbol are extracted in this order.
- the specific phase modulation manner of the local oscillator light by the receiving end may be as shown in FIG. 8 , and the same effect as the foregoing embodiment can also be achieved.
- this method requires that the modulation phase of the local oscillator light be changed twice per symbol period, that is, the frequency of the local oscillator light phase modulation is twice the signal symbol rate (the rates of the two are the same in the foregoing embodiments), which is 50 GHz .
- the balanced detector will output the in-phase component of the symbol, and in the second half period, the balanced detector will output the quadrature component.
- the in-phase and quadrature components must be extracted in the order of IQIQ during subsequent digital reception.
- a polarization beam splitter PBS
- PBS polarization beam splitter
- additional polarization demultiplexing is required to recover the single-polarization state signal, and the remaining algorithms are consistent with the single-polarization state reception, which can achieve the same effect as the embodiment in FIG. 5a.
- the embodiment of the present application is a low-cost coherent detection technology in a passive access network scenario, which performs coherent detection based on phase-modulated local oscillator light. Still in the category of homodyne detection, compared with the traditional local oscillator light form, the embodiment of the present application replaces the phase diversity by performing phase modulation on the local oscillator light. Compared with the traditional phase diversity homodyne detection system, the embodiment of the present application only A pair of balanced detectors is required to demodulate the signal, and no 90° optical mixer is required, which greatly reduces the cost on the device.
- I n Acos( ⁇ +2 ⁇ 2n ⁇ fT)
- R represents the responsivity of the photodiode
- P s represents the signal power
- P LO represents the local oscillator optical power
- ⁇ s represents the modulation phase of the signal itself
- ⁇ n represents the phase noise.
- Phase noise is mainly caused by the frequency deviation and line width of the laser source at the transceiver end, and it is unavoidable, which will cause the constellation diagram of the received signal to rotate.
- the signal in the intensity modulation format is received coherently, its intensity and phase will be detected, and the signal can be expressed as the following formula:
- the phase of the received signal only has a phase offset caused by frequency offset and phase noise.
- the signal has value only on the in-phase component.
- the phase of the signal will rotate, that is, the signal has values on the in-phase component I and the quadrature component Q, and the final manifestation is the rotation of the signal constellation.
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Abstract
Description
Claims (16)
- 一种相干检测方法,包括:接收发射端传输的强度调制光信号,其中,所述强度调制光信号是所述发射端对原始信号进行强度调制而得到的;对本振光信号进行相位调制,得到相位调制本振光信号;将所述强度调制光信号和所述相位调制本振光信号进行混合后依次进行光电探测、模数转换和数字信号接收处理,以恢复出原始信号。
- 根据权利要求1所述的方法,其中,所述对本振光信号进行相位调制,得到相位调制本振光信号包括:在每个符号周期内对所述本振光信号进行相位调制,得到相位调制本振光信号,其中,所述相位调制本振光信号的调制频率与所述强度调制光信号的符号速率一致;或在每个符号周期内对所述本振光信号分别进行两次相位调制,依次得到两个相位不同的相位调制本振光信号,其中,所述相位调制本振光信号的调制频率是所述强度调制光信号的符号速率的二倍。
- 根据权利要求2所述的方法,其中,所述接收发射端传输的强度调制光信号包括:利用偏振控制器,对所述发射端传输的所述强度调制光信号的偏振态进行调节,使所述强度调制光信号的偏振态与所述相位调制本振光信号的偏振态一致。
- 根据权利要求2所述方法,其中,所述方法还包括:利用第一偏振分束器,将所述相位调制本振光信号分为两个偏振态正交的相位调制本振光信号;相应地,所述接收发射端传输的强度调制光信号包括:利用第二偏振分束器,将所述发射端传输的所述强度调制光信号分为两个偏振态正交的强度调制光信号,以得到两组偏振态一致的强度调制光信号和相位调制本振光信号。
- 根据权利要求3或4所述的方法,其中,所述将所述强度调制光信号和所述相位调制本振光信号进行混合后依次进行光电探测、模数转换和数字信号接收处理,以恢复出原始信号包括:将偏振态一致的所述强度调制光信号和所述相位调制本振光信号进行混合;对混合后的光信号进行光电探测,得到包含每个符号的同相分量和正交分量的电信号;对所述包含每个符号的同相分量和正交分量的电信号进行模数转换;对模数转换后的包含每个符号的同相分量和正交分量的数字信号进行判决解调,以恢复出原始信号。
- 根据权利要求5所述的方法,其中,所述对模数转换后的包含每个符号的同相分量和正交分量的数字信号进行判决解调,以恢复出原始信号包括:提取每个符号的同相分量和正交分量;对每个符号的同相分量和正交分量进行取模判决,恢复出原始信号。
- 根据权利要求6所述的方法,其中,所述方法还包括:在对每个符号的同相分量和正交分量进行取模判决前,对已提取的所述每个符号的同相分量和正交分量进行正交化处理,以便对正交化处理后的每个符号的同相分量和正交分量进 行取模判决。
- 一种相干检测方法,包括:发射端对原始信号进行强度调制,得到强度调制光信号;接收端对本振光信号进行相位调制,得到相位调制本振光信号,并将所述相位调制本振光信号与所述发射端传输的所述强度调制光信号进行混合后依次进行光电探测、模数转换和数字信号接收处理,以恢复出原始信号。
- 一种相干检测装置,包括:信号接收模块,被设置成接收发射端传输的强度调制光信号,其中,所述强度调制光信号是所述发射端对原始信号进行强度调制而得到的;相位调制模块,被设置成对本振光信号进行相位调制,得到相位调制本振光信号;信号恢复模块,被设置成将所述强度调制光信号和所述相位调制本振光信号进行混合后依次进行光电探测、模数转换和数字信号接收处理,以恢复出原始信号。
- 根据权利要求8所述的装置,其中,所述相位调制模块包括:可调电延时线,被设置成对所述本振光信号的相位调制进行控制;相位调制器,被设置成在可调电延时线的控制下,在每个符号周期内对所述本振光信号进行相位调制,得到相位调制本振光信号,其中,所述相位调制本振光信号的调制频率与所述强度调制光信号的符号速率一致;或在每个符号周期内对所述本振光信号分别进行两次相位调制,依次得到两个相位不同的相位调制本振光信号,其中,所述相位调制本振光信号的调制频率是所述强度调制光信号的符号速率的二倍。
- 根据权利要求10所述的装置,其中,所述信号接收模块包括:偏振控制器,被设置成对所述发射端传输的所述强度调制光信号的偏振态进行调节,使所述强度调制光信号的偏振态与所述相位调制本振光信号的偏振态一致。
- 根据权利要求10所述的装置,其中,所述装置还包括:第一偏振分束器,被设置成将所述相位调制本振光信号分为两个偏振态正交的相位调制本振光信号;相应地,所述信号接收模块包括:第二偏振分束器,将所述发射端传输的所述强度调制光信号分为两个偏振态正交的强度调制光信号,以得到两组偏振态一致的强度调制光信号和相位调制本振光信号。
- 根据权利要求11或12所述的装置,其中,所述信号恢复模块包括:光耦合器,被设置成将偏振态一致的所述强度调制光信号和所述相位调制本振光信号进行混合;平衡探测器,被设置成对混合后的光信号进行光电探测,得到包含每个符号的同相分量和正交分量的电信号;模数转换器,被设置成对所述包含每个符号的同相分量和正交分量的电信号进行模数转换;数字信号接收器,被设置成对模数转换后的包含每个符号的同相分量和正交分量的数字信号进行判决解调,以恢复出原始信号。
- 根据权利要求13所述的装置,其中,所述数字信号接收器,被设置成提取每个符号的同相分量和正交分量,并对每个符号的同相分量和正交分量进行取模判决,恢复出原始信 号。
- 根据权利要求14所述的装置,其中,所述数字信号接收器,还被设置成在对每个符号的同相分量和正交分量进行取模判决前,对已提取的所述每个符号的同相分量和正交分量进行正交化处理,以便对正交化处理后的每个符号的同相分量和正交分量进行取模判决。
- 一种相干检测系统,包括发射端和接收端,其中:所述发射端,被设置成对原始信号进行强度调制,得到强度调制光信号;所述接收端,包括权利要求9-15任意一项所述的相干检测装置。
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EP21926370.4A EP4297297A1 (en) | 2021-02-18 | 2021-12-08 | Coherent detection method, apparatus, and system |
US18/546,886 US20240187106A1 (en) | 2021-02-18 | 2021-12-08 | Coherent detection method, apparatus, and system |
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Citations (3)
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JPS6451734A (en) * | 1987-08-21 | 1989-02-28 | Fujitsu Ltd | Bidirectional coherent light communication system |
CN105530054A (zh) * | 2015-12-14 | 2016-04-27 | 武汉邮电科学研究院 | 基于ask和dbpsk的强度调制相干检测系统及方法 |
US20170250776A1 (en) * | 2014-09-19 | 2017-08-31 | Telefonaktiebolaget Lm Ericsson (Publ) | Optical Transmitters and Receivers Using Polarization Multiplexing |
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2021
- 2021-02-18 CN CN202110187937.4A patent/CN114978340A/zh active Pending
- 2021-12-08 US US18/546,886 patent/US20240187106A1/en active Pending
- 2021-12-08 WO PCT/CN2021/136544 patent/WO2022174656A1/zh active Application Filing
- 2021-12-08 EP EP21926370.4A patent/EP4297297A1/en active Pending
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JPS6451734A (en) * | 1987-08-21 | 1989-02-28 | Fujitsu Ltd | Bidirectional coherent light communication system |
US20170250776A1 (en) * | 2014-09-19 | 2017-08-31 | Telefonaktiebolaget Lm Ericsson (Publ) | Optical Transmitters and Receivers Using Polarization Multiplexing |
CN105530054A (zh) * | 2015-12-14 | 2016-04-27 | 武汉邮电科学研究院 | 基于ask和dbpsk的强度调制相干检测系统及方法 |
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Title |
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LI YUN, LI ZHENGXUAN; HUANG XINGANG; YANG BO; ZHONG YIMING; MA ZHUANG; SONG YINGXIONG: "Coherent Detection System Based on Phase-Modulated Local Oscillator", ACTA OPTICA SINICA, SHANGHAI KEXUE JISHU CHUBANSHE , SHANGHAI, CN, vol. 41, no. 20, 1 October 2021 (2021-10-01), CN , pages 15 (200601 - 23 (200601-9), XP055960579, ISSN: 0253-2239, DOI: 10.3788/AOS202141.2006001 * |
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US20240187106A1 (en) | 2024-06-06 |
CN114978340A (zh) | 2022-08-30 |
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