Method for generating tunable ultra-wideband microwave frequency comb based on semiconductor laser

Abstract

The invention discloses a method for generating a tunable ultra-wideband (UWB) microwave frequency comb based on a semiconductor laser. The method comprises steps of: using a semiconductor laser to produce the tunable UWB microwave frequency comb, wherein the temperature and the current of the semiconductor laser are controlled by a current temperature control source; using an external signal source to modulate the driving current of the semiconductor laser, causing the semiconductor laser to output a seed source of the microwave frequency comb by adjusting the modulation frequency fm and the modulation power Pm of an signal source output signal; injecting continuous light output by an adjustable laser source into the current-modulated semiconductor laser, using a bandwidth enhancement effect caused by light injection to cause the semiconductor laser (SL) to produce the high-quality tunable UWB microwave frequency comb. The method can produce the microwave frequency combs with a continuously variable comb distance from 0.5GHz to 10GHz. The high-quality microwave frequency comb obtained in two adjustable comb distance ranges from 1.1GHz to 1.2GHz and from 3.3GHz to 8.0GHz can achieve a bandwidth up to 59GHz (within 10dB flatness amplitude).

Description

technical field [0001] The invention belongs to the field of microwave photon technology, and in particular relates to a method for generating a tunable ultra-broadband microwave frequency comb based on a semiconductor laser. Background technique [0002] Microwave frequency comb refers to a group of frequency components that are equally spaced like a comb in the frequency domain. It can provide both single-frequency microwave signals and multi-frequency microwave signals. Therefore, it can be used in frequency and distance measurement, broadband wireless communication, Satellite communication, anti-jamming test and other fields have broad application prospects. [0003] At present, the existing microwave frequency comb generation methods mainly include electrical and optical methods. The traditional electrical method is to use the nonlinear effects of electronic devices such as varactor diodes and transistors to generate microwave frequency combs. Although microwave frequ...

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Problems solved by technology

However, limited by the electronic bandwidth of the optoelectronic feedback loop, it is difficult to obtain a microwave frequency comb with a bandwidth up to 40 GHz using this scheme.

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