Optical carrier suppression-based optical fiber distribution system and method of photo-produced microwave signals

Abstract

The present invention provides an optical carrier suppression-based optical fiber distribution system and method of photo-produced microwave signals. The optical carrier suppression-based optical fiber distribution system of the photo-produced microwave signals includes a photo-produced microwave signal module, a phase detection module, a phase compensation module and a system output module; the photo-produced microwave signal module generates signal light which is required to be transmitted to a remote end and local light which serves as reference; the phase detection module detects phase jitter caused by optical fiber link jitter and obtains corresponding phase information; the phase compensation module controls the output of a voltage-controlled oscillator according to the phase information, and performs single-sideband modulation on the microwave signals outputted by a microwave signal generator through the output signals of the voltage-controlled oscillator, and then generates compensation signals; and the system output module outputs signals light which has been subjected to phase compensation. With the system and method of the invention adopted, phase detection sensitivity is increased to a magnitude order of light wavelength; technical difficulty in live operation-based high-frequency microwave mixing can be eliminated; a phase-locked loop is adopted to carry out feedback control on obtained phase error signals; and a phase compensation mechanism is fast and accurate, and is not limited in compensation scope.

Description

technical field [0001] The present invention relates to the technical field of optically generated microwave signal distribution, in particular to an optical fiber distribution system and method for optically generated microwave signals based on optical carrier suppression. Background technique [0002] The local oscillator reference signal distribution technology is a kind of transmission of highly stable local reference signals to remote users through optical fiber links. The reference signals recovered by remote users need to be highly coherent with the local reference signals. The core technology is how to eliminate Additional noise due to fiber link jitter. [0003] Phase error compensation caused by optical fiber link jitter is mainly divided into optical compensation method and electrical compensation method. The optical compensation method mainly relies on the optical delay line. Although it is not limited by the transmission frequency, its compensation range is lim...

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Problems solved by technology

The optical compensation method mainly relies on the optical delay line. Although it is not limited by the transmission frequency, its compensation range is limited by the length of the optical fiber in the delay module, and the response speed is relatively slow.

The methods of electrical compensation mainly include the method of electric delay line and frequency mixing. The electric delay line method is also limited by the compensation range. Although the frequency mixing method can avoid the design of the circuit, it needs to increase the number of microwave sources and lasers to generate Auxiliary signal

[0004] It is also a relatively common method to compensate the phase error by using a voltage-controlled oscillator. However, when performing high-frequency transmission, an oscillator with a high tuning coefficient will increase the circuit noise introduced by the phase-locked loop. Therefore, how to realize high-frequency microwave signal It is becoming more and more important to distribute the fiber link while reducing the additional noise caused by the feedback circuit

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