A method and device for measuring parameters of a coherent optical receiver based on frequency mixing

Abstract

The invention discloses a coherent optical receiver parameter measurement method based on frequency mixing. A optical carrier is divided into two paths, frequency shifting operation is performed on one path to acquire a frequency shifting optical carrier signal, a first microwave signal is used for modulating electro-optical intensity on the other path of optical carrier to acquire a carrier suppressed optical double-sideband signal, and the frequency shifting optical carrier signal and the carrier suppressed optical double-sideband signal are separately input into two input port of the coherent optical receiver; each output signal of the coherent optical receiver is mixed with a second microwave signal of which the frequency is the same as the frequency shifting amount of the frequency shifting operation, then amplitude and phase information of the mixed signal are extracted, and at last, an amplitude response and a phase response of each output channel of the coherent optical receiver under the wavelength of the optical carrier are acquired. The invention also discloses a coherent optical receiver parameter measurement device based on frequency mixing. According to the method anddevice provided by the invention, the measurement range can be greatly expanded, and the measurement accuracy and measurement efficiency can be improved.

Description

technical field [0001] The invention relates to a method for measuring parameters of a coherent optical receiver, in particular to a method and device for measuring parameters of a coherent optical receiver based on frequency mixing, and belongs to the technical field of photoelectric device measurement. 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...

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Problems solved by technology

[0005] In the prior art mentioned above, the limitation of "A Test Method and System for Delay and Phase Difference of Optical Coherent Receiver" is that it can only test the delay and phase difference of the optical coherent receiver to be tested, and simultaneously measure the time delay and phase difference of the optical coherent receiver. The frequency range is limited by the bandwidth of the sampling oscilloscope; the limitations of "Optical Single Sideband Modulation Method, Modulator and Optical Device Measurement Device, Measurement Method" require calibration measurement first, and the measurement efficiency is low

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