Frequency-adjustable triangular wave generating device based on optoelectronic oscillator

Abstract

A frequency-adjustable triangular wave generating device based on an optoelectronic oscillator comprises a light source, a polarization modulator, an optical coupler, a first polarization controller, a polarizer, a monomode optical fiber, a first photoelectric detector, a tunable narrow-band filter, a power amplifier, a second polarization controller, a polarization beam splitter, a tunable optical delay line, a polarization beam combiner and a second photoelectric detector, and the polarization modulator, the optical coupler, the first polarization controller, the polarizer, the monomode optical fiber, the first photoelectric detector, the tunable narrow-band filter, the power amplifier, the second polarization controller, the polarization beam splitter, the tunable optical delay line, the polarization beam combiner and the second photoelectric detector are connected with the light source in sequence. The input end of the tunable narrow-band filter is connected with the output end of the first photoelectric detector, and the input end of the tunable optical delay line is connected with an output port (2) of the polarization beam splitter. The cost of the frequency-adjustable triangular wave generating device is greatly reduced, microwave signals generated by the optoelectronic oscillator are good in quality and low in phase noise, and generated triangular waves are tunable in frequency.

Description

technical field [0001] The invention relates to a triangular wave generating device, in particular to a frequency-adjustable triangular wave generating device based on a photoelectric oscillator, which belongs to the technical field of microwave photonics. Background technique [0002] In modern radar, microwave signal processing, wireless communication and other fields, millimeter-wave signals with arbitrary waveforms are widely used. Among them, the microwave triangular wave signal plays an indispensable and important role in pulse compression, photon frequency conversion, and signal replication. There are two main methods for generating microwave triangular wave signals: one is the electrical method, and the other is the optical method. Limited by the bottleneck of electronics, the method of generating triangular wave signal by circuit has small bandwidth and low carrier frequency. Due to the wide bandwidth, low loss and anti-electromagnetic interference of optical devi...

AI Technical Summary

Problems solved by technology

So far, all methods of optically generating triangular waves have a common deficiency, that is, at least one external microwave signal source is required, which greatly increases the cost

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