Method for monitoring degradation of LD on line

Abstract

The invention discloses a method for monitoring degradation of an LD (Laser Diode) on line, and aims at providing a method capable of judging whether the LD degrades or not and judging the concrete degradation mode of the LD. The technical scheme of the method is characterized by constructing an LD degradation monitoring system consisting of a monitoring module and a diagnosis module, wherein themonitoring module is used for monitoring operating parameters of the LD, i.e., bias current, emitting light power and modulation current; the diagnosis module consists of a data collection sub-module,a parameter calculation sub-module and a diagnosis evaluation sub-module, and is used for calculating characterization parameters which can be used for judging the degradation mode of the LD and consist of a threshold current I and a slop efficiency k according to the operating parameters of the LD, and diagnosing the degradation mode of the LD based on the threshold current I and the slop efficiency k of the LD. Through adoption of the method of the invention, whether the LD degrades or not can be judged, and the concrete degradation mode of the LD also can be judged, in addition, the LD degradation monitoring system adopted in the method is simple in structure and easy in realization.

Description

technical field [0001] The invention relates to a method for monitoring degradation of semiconductor lasers, in particular to a method for on-line monitoring degradation of semiconductor lasers. Background technique [0002] Semiconductor lasers (Laser Diode, LD) are an important class of lasers, widely used in many development fields that affect national economy and national defense construction, such as optical fiber communication, optical disk storage, laser ranging, laser guidance, laser gyroscope, etc. As the core device of many optoelectronic devices, LD will have a huge impact on the operation of the entire device once it degrades or fails. Therefore, on-line monitoring of LD degradation is a key technology in LD applications. [0003] There is a small packaged optical module for optical fiber communication (hereinafter referred to as an intelligent optical module) that has an online degradation monitoring function. The intelligent optical module is composed of an op...

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Problems solved by technology

But the problem is that these two parameters are currently mainly monitored offline and cannot be monitored online, and the existing methods do not provide a method for diagnosing the degradation mode of LD

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