Parallel tunable laser module and method for achieving frequency fine tuning compensation of each channel

Abstract

The invention relates to the technical field of optical communication, and in particular discloses a parallel tunable laser module and a method for achieving frequency fine tuning compensation of each channel. According to the method, an instruction for frequency fine tuning is received by a firmware in a central processor of the parallel tunable laser module, a target frequency is adjusted by a biased current open loop of a DFB array laser chip, meanwhile, a current control circuit controls power and frequency of the parallel tunable laser module according to the instruction of the central processor, a temperature control circuit adjusts according to the instruction of the central processor, so that the DFB array laser chip reaches a required working temperature. By means of the characteristic of biased current fine tuning frequency of a DFB laser and thermal crosstalk characteristic between the channels of the parallel tunable laser module, the target frequency is slightly tuned by the open loop, the frequency fine tuning compensation between the laser module channels is increased, thus, the thermal crosstalk between the laser module channels is reduced, and finally, the purposes of reducing material cost, simplifying the production process and reducing the laser module size are achieved.

Description

technical field [0001] The invention relates to the technical field of optical communication, in particular to frequency fine-tuning compensation technology in a coherent communication system. Background technique [0002] The 100Gbps coherent communication system has become a technical solution widely used in long-distance optical fiber networks around the world. Because the coherent detection technology has the advantages of high sensitivity and long relay distance, and the digital signal processing at the back end of the receiver can perform electrical compensation for the channel impairments of the system, such as dispersion and polarization mode dispersion, etc., making the coherent technology become the current DWDM wavelength division technology. The key to increasing the capacity of multiplexing systems. [0003] The tunable laser module is one of the key devices in the coherent communication system, and the parallel tunable laser module can realize the multi-channe...

AI Technical Summary

Problems solved by technology

However, the existing solution not only has a high cost and a large laser module size, but also has the problem of thermal crosstalk between parallel light sources, that is, when one light source is adjusted, the power and frequency of other light sources are affected, which in turn affects the system performance. application

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