Ultra-high-speed spatial coherent optical communication method and system based on optical frequency comb

Abstract

The invention discloses a super speed spatial coherent optical communication method and system based on an optical frequency comb. According to the method, multi-wavelength self-correlation light sources are generated by using an optical frequency comb generator and an optical frequency comb amplification and shaping unit; multi-way high speed communication electric signals are modulated to the light sources, thus forming multi-wavelength self-correlation high speed binary phase shift keying (BPSK) coherent optical signals; the signals are multiplexed into super high speed optical signals by using wavelength division multiplexers; the signals are spatially coupled and transmitted by optical antennas; after inter-satellite and satellite-ground long distance spiral transmission, the signals are received by a receiving unit. According to the method and the system, the problems that carriers are difficult to coordinate and synchronize by taking multiple independent lasers as the light sources, and the stability of wavelengths, line widths and phases of the laser light sources at a receiving end are difficult to control are solved; the structure is simple; and the popularization difficulty is reduced.

Description

technical field [0001] The invention belongs to the field of space laser communication. It relates to the realization method of ultra-high-speed signal generation and coherent reception of space laser communication system. Background technique [0002] Due to the advantages of large communication capacity, good directivity, small size, small volume and low power consumption, space laser communication has become an important research topic in the field of space communication. With the explosive growth of satellite data, for high-speed, long-distance inter-satellite and satellite-ground optical communication systems, the combination of high-order modulation formats and optical multiplexing has become a very effective solution. Most of the existing space laser communication uses intensity modulation and direct detection to communicate. When light waves propagate in space, due to the influence of stray light such as sunlight, moonlight, starlight, atmosphere and seawater scatte...

AI Technical Summary

Problems solved by technology

In the existing solutions, each wavelength channel needs two light sources with the same wavelength to complete the sending and receiving functions, which greatly increases the demand for the number of lasers in the entire system. The receiving end also needs multiple optical 90-degree mixers, Photoelectric balance detectors have disadvantages such as complex system structure and high cost

In addition, the carrier wave of multiple independent lasers as light sources is not easy to coordinate and synchronize. The stability of the wavelength, line width and phase of the laser light source at the receiving end greatly limits its coherent reception performance. technical bottleneck

Images