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Laser noise reduction device and method for noise reduction by using same

A laser, laser technology, applied in lasers, laser parts, semiconductor lasers, etc., can solve problems such as noise, and achieve the effects of reducing noise, easy to carry and use, and simple design

Active Publication Date: 2015-09-23
INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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Problems solved by technology

[0005] The present invention aims to provide a laser noise reduction method to solve the noise problem caused by the fluctuation of the driving current source of the semiconductor laser, and promote the laser output of the laser to be more stable

Method used

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  • Laser noise reduction device and method for noise reduction by using same
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  • Laser noise reduction device and method for noise reduction by using same

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Embodiment Construction

[0036] see figure 1 As shown, the present invention provides a laser noise reduction method, which includes: a laser, two couplers, a wavelength division multiplexer, a plurality of optical fibers, an optical fiber delay line, and a detection PD, a high-pass filter, a low-pass filter, a detector, an analog-to-digital conversion chip (ADC), a main control chip (MCU), and a digital-to-analog conversion chip (DAC). Among them: the laser signal at the output end of the laser should be coupled and sampled, and then the sampling signal should be connected to the coupler; two laser beams are output at the output end of the coupler, one laser beam is directly connected to the input end of the wavelength division multiplexer, and the other laser beam Through the fiber optic delay line, it is connected to the other end of the input of the wavelength division multiplexer, so that two asynchronous signals are formed, one is a normal signal and the other is a delayed signal, in order to ac...

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Abstract

The invention relates to a laser noise reduction device and a method for noise reduction by using the same. The device comprises a laser, two couplers, a wavelength division multiplex (WDM), a plurality of optical fibers, an optical fiber delay line, a photoelectric detector (PD), a high-pass filter, a low-pass filter, a detector, an analog-to-digital conversion chip (ADC), a main control unit (MCU) and a digital-to-analog conversion chip (DAC). By the method, the noise problem of the laser caused by unstable current is effectively prohibited, laser stability is enhanced, the high-pass filter, the low-pass filter, the detector, the ADC, the DAC and the MCU all can be integrated onto a circuit board, the laser noise reduction device is compact and convenient, the integration of all components needed by the method on the laser is promoted, convenience and stability are achieved, and particular working environment is not needed. The laser noise reduction method is applicable for all noise problems caused by unstable current.

Description

technical field [0001] The invention belongs to the field of high-speed lasers, in particular to a laser noise reduction device and a noise reduction method using the device. Background technique [0002] With the expansion of the application field of semiconductor lasers, the research and development of semiconductor lasers are developing at a rapid pace. At present, semiconductor lasers have been widely used in optical fiber communications, optical discs, laser printing, information storage, medical treatment, measurement, pumping solid-state lasers, integrated optics and other fields, playing an increasingly important role in high-tech fields. Therefore, low noise is particularly important for lasers, especially in high-tech aspects. Semiconductor laser noise includes optical noise and electrical noise, where optical noise includes phase noise and intensity noise, and electrical noise includes thermal noise, shot noise, 1 / f noise, and g-r noise. The noise caused by the ...

Claims

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Application Information

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IPC IPC(8): H01S5/042H01S5/068
Inventor 谭俊陈伟王孙龙刘建国祝宁华
Owner INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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