Optoelectronic oscillator with tunable broadband frequency

Abstract

The invention discloses an optoelectronic oscillator with tunable broadband frequency, which is characterized in that a photon microwave filter is composed of an optical modulator, a high-fineness Fabry-Perot etalon and two fiber couplers and is applied to the optoelectronic oscillator. By tuning wavelength of laser light sources, the filtering peak of the photon microwave filter can be tuned; meanwhile, a microwave phase shifter is used cooperatively, thus continuous large-scale tuning of the optoelectronic oscillator can be realized finally.

Description

technical field [0001] The invention relates to the technical field of photoelectric oscillators, in particular to a broadband frequency tunable photoelectric oscillator. Background technique [0002] In applications such as wireless communication, radar, and optical-borne microwave communication, microwave signals with high signal quality and adjustable frequency are often required. The so-called signal quality mainly refers to the short-term frequency stability of the microwave signal, that is, phase noise, and the long-term stability, that is, frequency drift. At present, the mainstream solution for generating high-quality microwave signals on the market is a quartz oscillator, which can be used to obtain a stable crystal oscillator with a high quality factor (Q value). However, the quartz oscillator only has several high-Q oscillation modes at low frequencies. To obtain high-frequency microwave signals, it is necessary to add a frequency multiplication unit after the qu...

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Problems solved by technology

For example, Shumakher et al. used the slow light effect in a semiconductor optical amplifier (SOA) to cascade the SOA and an optical filter to form a photonic microwave phase shifter to realize the tuning of an optoelectronic oscillator. However, the tuning range of this method is still very small. Narrow; Yao Jianping and others connected two optical phase modulators in series and used the dispersion effect in the chirped fiber grating to form a broadband tunable optoelectronic oscillator. This method can achieve broadband tuning, but the supermode noise is large

In 2010, Ozdur et al. used a high-precision FP etalon as a photonic microwave filter in an optoelectronic oscillator to generate high-quality microwave signals. However, the oscillation frequency of this optoelectronic oscillator is equal to the free spectral range of the FP etalon , the microwave frequency cannot be tuned

[0005] Traditional optoelectronic oscillators use electric filters as mode selection devices, and the tuning range of electric filters is very limited, so it is difficult for traditional optoelectronic oscillators to achieve broadband tuning

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