Method and device for detecting phase noise of laser of coherent optical module

Abstract

The invention discloses a coherent optical module laser phase noise detection method and device, and relates to the technical field of optical communication equipment, and the method comprises the following steps: calculating an effective optical fiber length required by a to-be-detected coherent optical module based on a modulation code pattern and a signal baud rate of the to-be-detected coherent optical module; adjusting the optical fiber length to an effective optical fiber length by using an adjustable optical fiber length controller so as to carry out short fiber testing, extracting data detected by an ADC (Analog to Digital Converter) at a receiving end of a DSP (Digital Signal Processor) of the to-be-tested coherent optical module, and calculating equivalent error vector amplitude; and when the difference between the equivalent error vector amplitude and the error vector amplitude threshold is within a preset range, determining that the coherent optical module laser phase noise is qualified. According to the invention, no additional hardware circuit design is needed, and the laser whose phase noise does not meet application requirements can be rapidly screened out.

Description

technical field [0001] The invention relates to the technical field of optical communication equipment, in particular to a method and device for detecting phase noise of a coherent optical module laser. Background technique [0002] Driven by services such as mobile Internet, Internet of Things, cloud computing, and big data, optical transmission networks as various service bearer structures need to adapt to this new technical requirement. [0003] Based on the coherent optical system combined with coherent detection and high-speed digital signal processing (DSP), with its excellent advantages of electrical dispersion compensation, nonlinear compensation and carrier synchronization, super 100Gbp / s coherent optical communication is not only widely used in operator transmission networks , In the emerging DCI data center interconnection (Data Center Inter-connect), there is also a coherent sinking demand. Correspondingly, the requirements for the optical devices used inside th...

AI Technical Summary

Problems solved by technology

When the phase noise of the laser is abnormal, it cannot be effectively detected in the conventional back-to-back or short fiber test (such as the short fiber is less than 1 meter), but after passing through the transmission system line, there will be abnormal business or the fiber connection with the opposite optical module will not work. Difficult to troubleshoot

The conventional phase noise detection method detects low-frequency signals and performs amplification and filtering processing. Additional hardware circuits are required, and the scope of use is limited. It is not suitable for the flexible application requirements of various code patterns of coherent optical modules.

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