Device and method for reducing coherent noise of optical time domain reflectometer light source

Abstract

The invention relates to the field of optical modules, in particular to a device and method for reducing coherent noise of a light source of an optical time domain reflectometer. The device comprisesa laser device with a refrigerator, a main control unit, a logic unit used for controlling the pulse width of the laser device, a driving unit used for receiving a pulse signal of the logic unit and controlling the driving current of the laser device, and a temperature modulation unit used for modulating the target temperature of the refrigerator, wherein the temperature modulation unit modulatesthe target temperature of the refrigerator and enables the output wavelength of the laser to jitter so as to suppress coherent noise. According to the invention, the temperature modulation on the laser refrigerator is introduced, the output wavelength of the laser generates tiny jitter, coherent noise is reduced, the signal-to-noise ratio is increased, then the curve quality of the optical time domain reflectometer is improved, the scheme is achieved only through the main control unit, no extra cost increase is brought, and the scheme is simple and feasible, the adjustment range is small, andno extra risk is introduced while the signal-to-noise ratio of the optical time domain reflectometer is improved.

Description

technical field [0001] The invention relates to the field of optical modules, in particular to a device and method for reducing coherent noise of a light source of an optical time domain reflectometer. Background technique [0002] The optical time domain reflectometer is a basic tool for the installation and maintenance of optical fiber links. It is mainly used for the measurement, monitoring and fault location of optical fiber communication networks. It is used for real-time monitoring and management of optical fiber links in the link, so as to reduce the labor cost of optical fiber link maintenance and improve the timeliness of maintenance. [0003] At present, there are mainly two schemes for the laser light source of the optical time domain reflectometer. One is to use a wide-spectrum FP laser, which has low coherent noise, but it can only use bands other than the C+L communication band, such as 1625+ / -10nm band, in this band, due to the increase of optical fiber loss...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a device and method for reducing the coherent noise of the optical time domain reflectometer light source in view of the above-mentioned defects of the prior art, which overcomes the narrow line width of the optical time domain reflectometer in the prior art. For DFB lasers, the defects of large coherent noise and low signal-to-noise ratio

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