Microwave photon phase identification method and device and microwave photon phase locking method and device

Abstract

The invention discloses a microwave photon phase identification method used for detecting the phase difference between a microwave signal and an optical pulse signal. The method comprises the steps that a polarization modulator is used to modulate the microwave signal onto the optical pulse signal to generate a polarization modulation signal composed of two optical pulse sequence components with polarization states perpendicular to each other; the phase difference between two optical pulse sequence components in the polarization modulation signal is adjusted to 90 degrees; the polarization modulation signal is split into two paths by a polarization beam splitter, wherein the angles between the principal axis direction of the polarization beam splitter and the polarization direction of twooptical pulse sequence components are both 45 degrees; and finally balance photodetection is carried out on two signals to acquire an electrical signal, wherein the voltage of the signal and the phasedifference to be detected is proportional. The invention further discloses a microwave photon phase identification device and a microwave photon phase locking method and device. Compared with the prior art, the methods and devices have the advantages of simple and compact structure, high detection accuracy, low implementation cost and the like.

Description

technical field [0001] The invention relates to a microwave photon phase detection method, which is used for detecting the phase difference between a microwave signal and an optical pulse signal. Background technique [0002] Ultra-low phase noise microwave signal sources play an important role in many scientific research and engineering applications such as time-frequency measurement and standards, large-scale scientific equipment (such as free electron laser) synchronization, radar, networking, communication and signal measurement instruments. Various types of microwave sources have emerged in the past 30 years, among which sapphire oscillators and photoelectric oscillators have superior performance and are world-leading microwave sources. In recent years, with the development of solid-state and fiber-optic mode-locked lasers, the time jitter of optical pulses can reach the order of sub-hundred as, and the generation of microwave signals with ultra-low phase noise based on...

AI Technical Summary

Problems solved by technology

The first balanced microwave photon phase detector requires multiple narrow-band electric filters, frequency dividers, phase shifters, amplifiers and other microwave devices, and the system is complex; in the Sagnac ring, it is necessary to realize the microwave signal with half the optical pulse repetition frequency. The optical pulse transmitted to the direction realizes the opposite phase modulation in the phase modulator, so there are strict requirements on the position of the phase modulator in the Sagnac ring, and the operation is cumbersome

Another fiber ring microwave photon phase detector needs to add a π / 2 bias unit in the Sagnac ring to introduce a fixed π / 2 phase difference between the forward and reverse optical pulses in the ring, which also makes the system Complex and expensive

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