Spectral response measurement method and device for coherent optical receiver
A technology of spectrum response and measurement method, which is applied in the field of spectrum response measurement and devices of coherent optical receivers, can solve the problems that it is difficult to obtain the frequency response of coherent optical receivers with a bandwidth greater than 50 GHz, reduce measurement time and cost, and improve measurement Efficiency, the effect of breaking through the limitation of bandwidth
Active Publication Date: 2019-12-03
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology
However, the 3dB analog bandwidth of existing mature commercial coherent optical receivers is more than twice that of optoelectronic modulators
It is difficult for this technology to obtain the frequency response of a coherent optical receiver with a bandwidth greater than 50GHz
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[0031] Aiming at the deficiencies of the prior art, the idea of the present invention is to use the carrier-suppressed optical single-sideband signal and the carrier-suppressed optical double-sideband signal to perform frequency mixing, so as to break through the limitation of the bandwidth of the electro-optic modulator and convert the frequency response of the coherent optical receiver to The measurement range is doubled to improve measurement efficiency and reduce measurement time and cost.
[0032] Spectrum response measurement method that the present invention proposes is specifically as follows:
[0033] Use the angular frequencies Δω and ω e Carrier-suppressed optical single-sideband modulation and carrier-suppressed optical double-sideband modulation are performed on two homologous optical carriers by the two microwave signals, respectively, and the carrier-suppressed optical single-sideband modulation signal and the carrier-suppressed optical double-sideband modulat...
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The invention discloses a spectral response measurement method of a coherent light receiver. The method comprises steps of respectively modulating the two paths of homologous optical carriers by usingtwo paths of microwave signals with angular frequencies of delta omega and omega e to respectively obtain a carrier-suppressed optical single sideband modulation signal and a carrier-suppressed optical double sideband modulation signal, wherein omega e is less than delta omega respectively inputting the carrier-suppressed optical single sideband modulation signal and the carrier-suppressed optical double sideband modulation signal into two input ports of a coherent optical receiver to be measured, and measuring a delta omega+omega e component and a delta omega-omega e component in each path of output signal of the coherent optical receiver to be measured; and calculating the frequency response of each output port of the coherent optical receiver to be measured at the delta omega+omega e and delta omega-omega e angular frequencies according to the measured data. The invention also discloses a frequency spectrum response measuring device of the coherent light receiver. According to theinvention, the limitation of the bandwidth of an electro-optical device can be broken through, the measurement range of the frequency response of the coherent optical receiver is doubled, the measurement efficiency is improved, and the measurement time and the measurement cost are reduced.
Description
technical field [0001] The invention relates to a method and device for measuring the spectral response of a coherent optical receiver, and belongs to the intersecting technical field of photoelectric device measurement and microwave photonics. Background technique [0002] With the rapid development of information technology and the rise of high-speed services such as P2P and high-definition video, people's requirements for data transmission bandwidth, capacity and other indicators are increasing. When the transmission capacity and transmission rate continue to increase, time-division multiplexing in the existing network can no longer meet the demand. Coherent optical communication has the characteristics of long relay distance, large communication capacity, good selectivity, high sensitivity, and multiple modulation methods, and is widely used. [0003] An important component in coherent optical communication is the coherent optical receiver. The task of the coherent opt...
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IPC IPC(8): H04B10/079
CPCH04B10/0795H04B10/07955H04B10/0799
Inventor 薛敏吕明辉潘时龙
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS