A microwave optical fiber phase-stable transmission method to eliminate local oscillator leakage in passive phase correction

Abstract

The invention discloses a microwave optical fiber phase-stable transmission method for eliminating local oscillator leakage in passive phase correction. The central station modulates the target microwave signal onto the optical signal and transmits it to the remote node. The remote node splits the received microwave signal into two channels, one for triple frequency, and the other for transmission back to the central station. At the central station, the received optical signal is converted to a third light source with a different wavelength, and then transmitted to the remote node through a wavelength division multiplexer for photoelectric detection and band-pass filtering. The output microwave signal is first It is mixed with the base frequency signal component, and the band-pass filtered sum frequency signal is mixed with the triple frequency signal component, and the band-pass filtered difference frequency signal is mixed with the base frequency signal component again, and the output microwave signal The sum-frequency signal after band-pass filtering is divided by a frequency divider to obtain a phase-stable target microwave signal. In the invention, the time required for microwave phase stabilization is short and the quality is high, and the local oscillator leakage signal introduced by frequency mixing in the traditional passive phase correction method is eliminated.

Description

technical field [0001] The invention relates to a microwave signal transmission method, in particular to a microwave optical fiber phase-stable transmission method for eliminating local oscillator leakage in passive phase correction, and belongs to the fields of microwave photonics technology and microwave engineering technology. Background technique [0002] In applications such as radio astronomy, deep space networks, distributed synthetic aperture radar systems, high-precision clock standard distribution, and particle accelerators, the receiver uses carrier phase for positioning, so it is required to use the reference microwave signal or local oscillator signal with the minimum phase Changes are transmitted to another site. Microwave photonic technology has the characteristics of small transmission loss, large bandwidth, anti-electromagnetic interference, lightness and flexibility, but the use of optical fiber transmission technology is affected by uncontrollable environm...

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Problems solved by technology

[0004] In view of the above deficiencies in the prior art, the present invention aims to provide a microwave optical fiber phase-stable transmission method that eliminates local oscillator leakage in passive phase correction, so as to overcome the disadvantage of slow phase correction speed in the traditional active phase correction phase stabilization method and Solve the defect of LO leakage in the passive phase correction method

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