Fast phase locking method for homodyne laser communication based on direct phase control

Weijie Ren; Jianfeng Sun; Peipei Hou; Ronglei Han; Hongyu He; Haisheng Cong; Chaoyang Li; Longkun Zhang; Yuxin Jiang

doi:10.1117/12.2632040

30 September 2022 Fast phase locking method for homodyne laser communication based on direct phase control

Weijie Ren, Jianfeng Sun, Peipei Hou, Ronglei Han, Hongyu He, Haisheng Cong, Chaoyang Li, Longkun Zhang, Yuxin Jiang

Proceedings Volume 12237, Laser Communication and Propagation through the Atmosphere and Oceans XI; 122370L (2022) https://doi.org/10.1117/12.2632040
Event: SPIE Optical Engineering + Applications, 2022, San Diego, California, United States

Abstract

In the field of space optical communication, coherent communication system has the advantages of high sensitivity, compatibility with a variety of modulation formats and strong anti-interference ability compared with intensity modulation direct detection (IM-DD) system. The typical disadvantage of coherent communication system is the complexity of the receiver, which requires carrier recovery. Space optical communication is also developing from point-to-point communication to optical communication network. In this paper, a fast phase locking method based on direct phase control is proposed. After the auxiliary frequency acquisition is completed, the time to recover the carrier is equal to the loop delay. The realization of this method depends on the direct control of the local oscillator carrier phase. Different from the traditional second-order loop method, this method does not need to consider the laser linewidth. This method can greatly save the time of carrier recovery, so it can be used for fast switching of optical network channels and can improve the utilization of optical networks.

Citation Download Citation

Weijie Ren, Jianfeng Sun, Peipei Hou, Ronglei Han, Hongyu He, Haisheng Cong, Chaoyang Li, Longkun Zhang, and Yuxin Jiang "Fast phase locking method for homodyne laser communication based on direct phase control", Proc. SPIE 12237, Laser Communication and Propagation through the Atmosphere and Oceans XI, 122370L (30 September 2022); https://doi.org/10.1117/12.2632040

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KEYWORDS

Mode locking

Oscillators

Phase shift keying

Homodyne detection

Laser communications

Optical communications

Filtering (signal processing)

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