A system and method for monitoring the ld optical power of a multi-channel laser with a single channel pd
A laser and multi-channel technology, applied in the direction of photometry, instruments, scientific instruments, etc., can solve the problems of increasing the difficulty of optical path design and increasing the difficulty of product implementation process, so as to save design space, reduce occupied space, and distribute structure compact effect
Active Publication Date: 2018-12-25
成都光创联科技有限公司
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Problems solved by technology
When the multi-channel laser LD works in the form of multiplexing (WDM), the highly dense devices are very particular about the installation space. The one-to-one monitoring method not only increases the difficulty of optical path design, but also increases the difficulty of product implementation process, resulting in product yield and reliability. sexual problems
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[0018] In order to facilitate those skilled in the art to understand the technical content of the present invention, the content of the present invention will be further explained below in conjunction with the accompanying drawings.
[0019] Such as figure 1 Shown, a kind of single-channel PD monitoring system of multi-channel laser LD optical power of the present invention comprises: multi-channel laser LD, wavelength division multiplexer WDM MUX (wavelength division multiplex multiplexer), ratio beam splitter, detector PD , amplifier AC-OPA (Operational Amplifier, operational amplifier), analog-to-digital converter ADC (Analog-to-Digital Converter) and micro control unit MCU (Microcontroller Unit); each channel of the multi-channel laser corresponds to a laser driver, each The laser driver controls the laser to send out optical signals; the wavelength division multiplexing combiner combines the optical signals sent by the multi-channel lasers, and the ratio beam splitter is ...
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The invention discloses a method and system for adopting a single-channel PD to monitor optical power of multi-channel lasers LD, and belongs to the field of a photoelectric device. A micro control unit adds low-frequency signals in different frequency to laser drivers corresponding to channels respectively so as to distinguish detected channels; a ratio spectroscope is arranged on an emitting end optical path of a wavelength division multiplexing combiner at an appropriate included angle to enable reflected light to be obtained by a photodetector PD; then, the low-frequency signals are amplified and separated through an amplification circuit of an operation amplifier, and the low-frequency signals are converted into digital signals through an analog-digital converter for the micro control unit to carry out analysis to obtain magnitude and frequency of each low-frequency signal, different frequencies representing lasers corresponding to different channels; and emission optical power of lasers corresponding to corresponding channels can be obtained according to the magnitude of the low-frequency signals, and luminous optical power of each channel of laser can be obtained.
Description
technical field [0001] The invention belongs to the field of photoelectric devices, in particular to a method for monitoring the optical power of a multi-channel high-speed multi-channel laser LD. Background technique [0002] Due to its unique properties, laser has been widely used in the fields of laser communication, laser ranging, laser guidance and laser radar. Compared with ordinary radio communication, laser communication has the main advantages of high communication rate and good confidentiality. It is an important supplementary method of radio communication under strong interference, and can ensure smooth communication when radio is silent. In recent years, the technology related to high-power semiconductor multi-channel laser LD (Laser diode, laser diode) has developed rapidly, the output power has been continuously improved, and the output wavelength has also been extended from 440nm to 1600nm. [0003] With advanced manufacturing technologies such as micro-fine ...
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IPC IPC(8): G01J1/42
CPCG01J1/4257
Inventor 许远忠贺明寿张强李惠敏
Owner 成都光创联科技有限公司