Digital carrier regeneration system and method based on coherent detection and digital signal processing

Abstract

The invention discloses a digital carrier regeneration system and method based on coherent detection and digital signal processing, and relates to the field of coherent light communication. The system comprises a transmitting end and a receiving end, wherein the transmitting end is used for modulating a baseband signal with a carrier suppression intensity modulation way and generating a carrier suppression light intensity modulation signal to lower the energy proportion of light carriers in the whole modulation signal and to increase the transmission efficiency of a practical effective signal; and the receiving end is used for recovering the carrier suppression light intensity modulation signal with a digital carrier regeneration way combining the coherent detection with a digital signal processing technology. Through adoption of the digital carrier regeneration system and method, the transmission efficiency and power budge of the light intensity modulation signal can be increased, and the transmission distance is prolonged.

Description

technical field [0001] The invention relates to the field of coherent optical communication, in particular to a digital carrier regeneration system and method based on coherent detection and digital signal processing. Background technique [0002] The traditional light intensity modulation signal usually uses direct detection, which has the advantages of simple structure and easy implementation. The light intensity modulation adopts direct detection and will not be affected by the line width of the laser. Therefore, a lower-cost DFB (Distributed Feed Back, distributed feedback laser) or VCSEL (Vertical Cavity Surface Emitting Laser, vertical cavity surface emitting laser) can be used as the light source. . However, light intensity modulation adopts direct detection, which is usually limited by factors such as chromatic dispersion and photodetector sensitivity, so it is difficult to apply to occasions with high power budget and long transmission distance. In addition, the t...

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Problems solved by technology

However, light intensity modulation uses direct detection, which is usually limited by factors such as chromatic dispersion and photodetector sensitivity, so it is difficult to apply to occasions with high power budget and long transmission distance

In addition, the traditional optical intensity modulation signal contains high optical carrier power, which seriously affects the transmission efficiency of the optical intensity modulation signal

Although the carrier-suppressed intensity modulation has been used at the transmitting end of the traditional system, the receiving end of the traditional system cannot recover the carrier-suppressed intensity-modulated signal

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