Bidirectional homologous coherent microwave optical fiber stable-phase transmission method

Abstract

The invention discloses a bidirectional homologous coherent microwave optical fiber stable-phase transmission method. A bidirectional homologous coherent microwave optical fiber stable-phase transmission system using the method comprises front-end equipment and rear-end equipment; the front-end equipment and the rear-end equipment are connected through a double-core optical fiber and are used forrespectively transmitting uplink and downlink optical signals; a stationary phase reference source is arranged in the front-end equipment and generates a stationary phase reference electric signal, the stationary phase reference electric signal is modulated into a stationary phase reference optical signal, the stationary phase reference optical signal is transmitted to the rear-end equipment through a double-core optical fiber between the front-end equipment and the rear-end equipment, and returns the stationary phase reference optical signal into uplink and downlink phase shift information optical signals through an original path of the double-core optical fiber; and the uplink and downlink phase-shift information optical signals are demodulated into uplink and downlink phase-shift information electric signals, a phase difference generated by phase comparison between the uplink and downlink phase-shift information electric signals and a stationary phase reference electric signal are converted into uplink and downlink phase-shift control signals, and stationary phase control is performed on the uplink and downlink optical signals transmitted in the double-core optical fiber, thereby realizing stationary phase transmission of the bidirectional homologous coherent microwave optical fiber.

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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