A Phase-Stable System for Signal Long-distance Transmission Based on Injection-Locked Photoelectric Oscillator

Abstract

The present invention is a long-distance signal transmission phase stabilization system based on an injection-locked photoelectric oscillator. Based on the principle of passive compensation and the injection-locked photoelectric oscillator OEO microwave signal generation technology, a high frequency stability and low phase noise system is proposed. Implementation scheme for long-distance phase-stable transmission of local oscillator microwave signals. On the one hand, compared with the phase-stable transmission technology using the active compensation method, this scheme can be applied to microwave signal transmission with higher frequency band, larger bandwidth and better phase noise level. The traditional active compensation scheme has the disadvantage of limiting the frequency band bandwidth of electrical devices and introducing electrothermal noise. On the other hand, the general passive passive compensation scheme has problems such as high phase noise level, which limits the short-term stability of the signal transmitted to the far end. The invention can make the phase-stable transmission of the microwave signal more widely used, and make up for the defect of the traditional scheme on the phase noise.

Description

Technical field: [0001] The invention provides a long-distance signal transmission phase stabilization system based on an injection-locked photoelectric oscillator, and relates to the research field of microwave photonics microwave signal phase stabilization transmission. Background technique: [0002] Today, high-stability LO signal transmission over optical fibers is of great importance for a variety of applications, such as remote clock synchronization and comparison, radio astronomy, distributed coherent aperture radar, and more. However, the transmission delay of the optical fiber is affected by the environmental temperature disturbance and pressure change, resulting in that the phase stability of the transmitted LO microwave signal will be significantly reduced at the remote site. With the increasing frequency and stability requirements of users for signal transmission, the phase noise level and frequency of traditional transmission structures can no longer meet the re...

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Problems solved by technology

However, as the transmission distance (optical fiber length) increases, the frequency drift caused by the slow change of the optical fiber during transmission may be accumulated and cannot be compensated in time, and it is difficult to suppress the phase noise in the process of local oscillator signal generation, which is further superimposed on the remote On the phase noise spectrum of the terminal signal, the short-term stability of the system is affected during the mixing compensation

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