Tunable ultra-wideband microwave signal generator based on microwave photonic technology

Abstract

The invention discloses a tunable ultra-wideband microwave signal generator based on a microwave photonic technology. The tunable ultra-wideband microwave signal generator comprises a tunable spectrum structure unit 109, an optical Fourier transform unit 107 and a photoelectric conversion unit 108, wherein the tunable spectrum structure unit 109 comprises an optical pulse generator 101, a circulator102, a specific fiber Bragg grating 103, an optical attenuator 104, a tunable comb filter 105 and an optical coupler 106. According to the tunable ultra-wideband microwave signal generator, six spectrums with different orders, different polarities and an ultra-wideband pulse signal shape can be formed in a single module in a tuning manner; the six spectrums can be converted into six corresponding ultra-wideband pulse signals; better tenability is obtained; and according to a given spectrum construction method, the ultra-wideband microwave signals with one, two and three orders and positive and negative polarities can be generated, and thus the flexibility of the ultra-wideband microwave signal generator is greatly improved.

Description

technical field [0001] The invention relates to the field of optical communication, in particular to the technology of generating ultra-broadband microwave signals by photon method. It is suitable for tunable generation of first-order, second-order and third-order positive and negative polarity ultra-wideband microwave signals. Background technique [0002] Ultra-wideband signals, also known as UWB signals, have the advantages of low power consumption, low spectral density, and anti-multipath fading, and are suitable for short-distance high-speed indoor wireless communications or sensor networks. In 2002, the American Communications Association approved the free use right of the ultra-wideband signal spectrum segment (3.1-10.6GHz) whose optical power spectral density is lower than -42.3dBm / MHz. Therefore, the partial bandwidth of the UWB signal should be greater than 20% or the spectral bandwidth of 10dB should be greater than 500MHz. [0003] In recent years, an ultra-wid...

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Problems solved by technology

[0005] The above four schemes all use microwave photonic technology to realize the generation of tunable ultra-wideband microwave signals, but few schemes can tunably generate first-, second-, and third-order positive and negative polarity ultra-wideband microwave signals, which restricts Further development of technologies such as modulation of ultra-wideband signals

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