Method and device for controlling output light power and optical communication system

Abstract

The invention discloses a method for controlling output light power, comprising the following steps: receiving a first laser signal, wherein the first laser signal comprises red shift signals and blue shift signals; filtering the first laser signal, filtering and outputting the blue shift signals and a first red shift signal, and reflecting a second red shift signal when the frequency spectrum of the blue shift signal is in a passband and the frequency spectrum of the red shift signal is in a transition zone; receiving the reflected second red shift signal, and carrying out deferred processing on the second red shift signal, so that the phase difference of the second red shift signal and the first red shift signal is odd times of pi; and combining the second red shift signal which is subjected to the deferred processing with the blue shift signals and the first red shift signal so as to output a second laser signal. According to the embodiment, the spectrum width of output signals can be decreased, the extinction ratio of the output signals is increased, the implementation difficulty of a filter can be reduced, and the implementation cost is reduced.

Description

technical field [0001] The invention relates to the field of laser technology, in particular to a method, device and optical communication system for controlling output optical power. Background technique [0002] In fiber optic communication systems, important characteristics include distortion-free transmission distance and receiver sensitivity. The difference between the sensitivity tested at the optical transmitter and the sensitivity tested at the optical receiver after optical fiber transmission is called dispersion penalty. If you need to increase the transmission distance without distortion, you can increase the output optical power of the optical transmitter, reduce the dispersion penalty, and increase the extinction ratio. When the existing directly modulated laser emits "1" and "0" bits, the carrier concentration of the laser is different, resulting in a change in the refractive index. When emitting a "1" bit, the wavelength becomes smaller and the frequency incr...

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Problems solved by technology

[0004] In the process of researching the existing technology, the inventor found that the existing method of controlling the output optical power requires the filter to have a strong out-of-band suppression, and also needs to pass the high-frequency blue-shift signal, which makes the realization of the filter more difficult , high cost to implement

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