Photoelectric phase demodulation phase locking device based on Mach-zehnder modulator

Abstract

The invention relates to a photoelectric phase demodulation phase locking device based on a Mach-zehnder modulator. The device comprises a light clock oscillating source, an electric clock oscillating source, the Mach-zehnder modulator, a photoelectric detector, a loop filter, a signal gatherer and a signal feedback link. According to the device, the Mach-zehnder modulator is taken as a photoelectric phase demodulation unit to load an electric clock signal to a light clock signal, and a phase error of the two clock signals is detected through a photoelectric conversion unit, on the other hand, the detected phase error signal is fed back through the loop filer to a light clock signal source or an electric clock signal source to realize locking of the two clock signals. The device is advantaged in that the device has crucial significance to improve performance of microwave photonics systems requiring high coherence signal sources, such as microwave photon radars and coherence communication systems.

Description

technical field [0001] The invention relates to optical information processing, in particular to a photoelectric phase detection and locking device based on a Mach-Zehnder modulator. Background technique [0002] Photoelectric locking technology has important applications in the generation of high-stable signal sources, the realization of high-resolution measurement equipment, the processing and transmission of optical signals, and the synchronization of large-scale scientific equipment. Similar to traditional radio frequency phase-locking technology, photoelectric locking systems The controlled signal and the reference signal can be frequency and phase locked such that their frequency and phase remain in a fixed relationship. According to the different mechanisms of the phase detector in the photoelectric locking system, the controlled signal and the reference signal can be either optical signals or electrical signals. Through the photoelectric locking system, the controll...

AI Technical Summary

Problems solved by technology

The disadvantage of this phase detector is that the structure is relatively complex, the adjustment and maintenance costs of the system are high, and it is difficult to integrate

[0008] However, there are constraints among the existing photoelectric phase-detection and phase-locking technology system structure, cost, performance and integration, so it is necessary to propose a new type of photoelectric phase-detection and phase-locking device

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