A Bidirectional Homologous Coherent Microwave Optical Fiber Phase Stable Transmission Method

Abstract

A bidirectional homologous coherent microwave optical fiber phase-stabilized transmission method, the bidirectional homologous coherent microwave optical fiber phase-stabilized transmission system using the method includes a front-end device and a back-end device; the front-end device and the back-end device are connected by a dual-core optical fiber , to transmit uplink and downlink optical signals respectively; a phase-stable reference reference source is set in the front-end equipment, and the phase-stable reference reference source generates a phase-stable reference reference electrical signal, and the phase-stable reference reference electrical signal is modulated into a phase-stable reference reference optical signal, which is passed through the front-end The dual-core optical fiber between the equipment and the back-end equipment is transmitted to the back-end equipment, and then returns through the original path of the dual-core optical fiber to become the uplink and downlink phase-shifted information optical signals; the uplink and downlink phase-shifted information optical signals are demodulated into uplink and downlink The phase difference generated by the phase comparison between the phase-shifting information electrical signal and the phase-stable reference electrical signal is converted into an uplink and downlink phase-shifting control signal, and the phase-stabilization control is performed on the uplink and downlink optical signals transmitted in the dual-core optical fiber, thereby realizing bidirectional synchronization. Phase-stable transmission of source coherent microwave fibers.

Description

technical field

[0001] The invention relates to the technical field of microwave optical transmission, in particular to a bidirectional homologous coherent microwave optical fiber phase-stable transmission method. Background technique

[0002] In the current microwave optical transmission system, after the signal is transmitted through the optical fiber, especially the long-distance optical fiber transmission, the propagation of the microwave optical signal in the optical fiber is affected by the external temperature. The phase of the microwave signal after the back-end photoelectric modulation changes greatly, especially when the optical fiber is affected. The external temperature changes, and its phase changes greatly, which cannot meet the long-distance phase stability requirements of microwave signals, thus restricting the application of microwave photonic technology in transmission systems such as radar. In order to avoid this problem of phase change caused by the influ...

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