Up-conversion device of vector signals based on photoelectric oscillator

Abstract

The invention discloses an up-conversion device of vector signals based on a photoelectric oscillator The device comprises a laser device, a first photoelectric modulator, a first optical fiber coupler, a first optical fiber, a first filter, a first photoelectric detector, a second filter, an optical crossover wavelength division multiplexer, a second photoelectric modulator, a second optical fiber coupler, a second optical fiber and a second photoelectric detector. In comparison with a traditional microwave photon up-conversion system, the device has the advantages that baseband signals do not need to be modulated onto microwave signals and frequency-conversion modulation of the baseband signals are directly conducted on optical carrier waves, so operations are more convenient; and positive and negative first-order sideband beat frequencies of the same channel of optical signals can be used to conduct up-conversion of two folds of a local frequency, most noise disturbance is offset, and a signal to noise ratio is increased.

Description

technical field [0001] The invention relates to the field of microwave photon frequency conversion, in particular to a vector signal up-conversion device based on a photoelectric oscillator. Background technique [0002] Microwave technology is currently used in many fields such as wireless communication, electronic countermeasures, radar detection, satellite communication and navigation. In fact, the frequency band resources in the low frequency band are almost exhausted. In order to obtain a larger working bandwidth, researchers have turned their attention to higher frequency bands, especially the millimeter wave band of 30-300GHz. The multi-state conversion of traditional electrical mixers limits the dynamic range of frequency conversion, and at the same time the modulation range and bandwidth are limited, while microwave photonic frequency conversion technology has the advantages of low loss, high bandwidth, anti-electromagnetic interference, simplicity and portability, ...

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Problems solved by technology

In "Afull-band RF photonic receiver based on the integrated ultra-high Qbandpass filter" by Hongchen Yu et al. (Optical Fiber Communications Conference and Exhibition 2015, pages 1-3), a cascade of two Mach-Zehnder modulators is proposed The concept of down-conversion is realized. In this scheme, a Mach-Zehnder modulator is used to modulate the local oscillator signal onto the optical carrier, and an optical cross-wavelength division multiplexer is used to separate the positive and negative first-order sidebands of the modulated optical signal. A phase modulator modulates the radio frequency signal to be processed to the positive first-order sideband optical signal, and then uses a photodetector to beat it with the negative first-order sideband to obtain a down-converted electrical signal, ensuring a large noise-free However, it is necessary to modulate the baseband signal to the RF signal and then convert the frequency. At the same time, when a large range of frequency conversion is required, a high-cost RF signal source is still required as a local oscillator.

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