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Device and method for monitoring performance of semiconductor laser device of electric pump

A technology of lasers and semiconductors, applied in the field of optoelectronics, which can solve problems such as performance degradation, impact, failure, etc.

Inactive Publication Date: 2013-04-10
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the above-mentioned processes, if there is a problem with the laser itself, such as performance degradation or failure, it may have an impact on those monitoring methods

Method used

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  • Device and method for monitoring performance of semiconductor laser device of electric pump
  • Device and method for monitoring performance of semiconductor laser device of electric pump

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Experimental program
Comparison scheme
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Embodiment Construction

[0019] The device and method of the present invention will be described in detail below on the basis of the accompanying drawings. The driving circuit (1) is used to drive the semiconductor laser (2) to work, and the sampling circuit (5) measures the current or voltage output by the driving circuit (1). Take a sample and send the sampled value to the controller (8). The semiconductor laser (2) emits laser light under the drive of the drive circuit (1), and the emitted laser light passes through the beam splitter (6) and then enters separately To the first photodetector (3) and the second photodetector (4) with the same performance, the first and second photodetectors respectively convert the received incident light into current or voltage, and both will change The current or voltage is sent to the comparison calculation circuit (7). The comparison calculation circuit (7) first calculates whether the ratio of the current or voltage sent by the first and second photodetectors is e...

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Abstract

The invention relates to a device and a method for monitoring the performance of a semiconductor laser device of an electric pump. When the performance of the semiconductor laser device of the electric pump is not changed, a relation between input driving current and output light intensity of the semiconductor laser device substantially keeps constant; for example, when the value of the input driving current is a certain value, the value of the output light intensity is required to be substantially a fixed value; if the performance of the laser device is changed, for example, the laser deviceis failed, the substantially constant relation is changed; therefore, the change of the performance of the semiconductor laser device can be judged by monitoring the change of the relation.

Description

Technical field [0001] The invention relates to a semiconductor laser performance monitoring device and method, belonging to the field of optoelectronic technology. Background technique [0002] Semiconductor lasers and laser diodes belong to a kind of very commonly used optical devices. Many of them are electrically pumped. For electrically pumped semiconductor lasers, in order to obtain a stable output, or to achieve protection for the laser, people have come up with various For example, when a large current flows through the laser, a detection device is used for monitoring, and a cut-off or switching device is used to cut off or switch the driving current to achieve the protection of the laser; there are also some to achieve For the stable output of the laser, a photodetector is used to monitor the light output of the laser. When the light output is weakened, the drive current of the laser is increased accordingly to maintain a constant current. In the above-mentioned process...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/26
Inventor 李松涛任芝
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)