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 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 traditi...

Examples

Embodiment Construction

[0036] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0037] An embodiment of the present invention provides a digital carrier regeneration system based on coherent detection and digital signal processing, including a sending end and a receiving end. The sending end adopts a carrier-suppressed intensity modulation method to modulate a baseband signal to generate a carrier-suppressed light intensity Modulate the signal to reduce the energy ratio of the optical carrier in the entire modulated signal and increase the transmission efficiency of the actual effective signal; to recover.

[0038] The sending end can include MZM (Mach-Zhender Modulator, Mach-Zehnder modulator), the receiving end includes coherent receiver, ADC (Analog-Digital Converter, analog-to-digital converter), digital signal processing chip, and the coherent receiver includes 90-degree Optical mixers and balanced detector...

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 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 traditi...

Examples

Embodiment Construction

[0036] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0037] An embodiment of the present invention provides a digital carrier regeneration system based on coherent detection and digital signal processing, including a sending end and a receiving end. The sending end adopts a carrier-suppressed intensity modulation method to modulate a baseband signal to generate a carrier-suppressed light intensity Modulate the signal to reduce the energy ratio of the optical carrier in the entire modulated signal and increase the transmission efficiency of the actual effective signal; to recover.

[0038] The sending end can include MZM (Mach-Zhender Modulator, Mach-Zehnder modulator), the receiving end includes coherent receiver, ADC (Analog-Digital Converter, analog-to-digital converter), digital signal processing chip, and the coherent receiver includes 90-degree Optical mixers and balanced detector...

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