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

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 ...

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