All-optical broadband micro-wave frequency comb generator

Abstract

The invention discloses an all-optical broadband micro-wave frequency comb generator and relates to the technical field of coupling device of optical waveguide and a photoelectric element. The generator comprises a frequency comb seed resource generating module, an adjusting control module and a frequency spectrum expanding module. The frequency comb seed resource generating module comprises a first semiconductor laser, a first aspherical lens, a first beam splitter, a second beam splitter, a first Faraday rotator, a second Faraday rotator, a first plane mirror and a second plane mirror. The adjusting control module comprises a computer and a piezoceramics. The frequency spectrum expanding module comprises an adjustable attenuator, an opto-isolator, a second aspherical lens and a second semiconductor laser. The all-optical broadband micro-wave frequency comb generator has the advantages that electronic bottleneck is broken, comb distance adjustment is flexible, wide-broadband microwave frequency comb signal is further acquired, and comb lines are balanced in a certain degree.

Description

technical field [0001] The invention relates to the technical field of coupling devices for optical waveguides and photoelectric elements, in particular to an all-optical broadband microwave frequency comb generator. Background technique [0002] Microwave frequency combs are widely used and have shown great application prospects in related fields such as radar detection, electromagnetic compatibility (EMC) testing, and broadband wireless communication. [0003] Generally, existing microwave frequency comb acquisition schemes can be divided into two types: electrical and optical. The electrical scheme is a traditional microwave frequency comb generation scheme based on a nonlinear circuit of capacitance or resistance. Although the microwave frequency comb generated by electrical means has a bandwidth of several GHz or even more than ten GHz, its application is greatly limited because the comb distance cannot be adjusted flexibly. In addition, with the further increase in t...

AI Technical Summary

Problems solved by technology

Since the physical mechanism of this acquisition method is to use all the comb lines in the optical frequency comb to beat in the PD to obtain the microwave frequency comb, it is difficult to guarantee the obtained microwave frequency even if the power-balanced optical frequency comb is converted by PD. The power balance can be achieved between the comb lines

In order to obtain a microwave frequency comb with balanced power, it is usually necessary to introduce complex spectral dispersion management, which makes the system for obtaining a microwave frequency comb based on an optical frequency comb more complex and expensive.

In addition, the microwave frequency comb can also be generated based on the nonlinear effect in the optical fiber, and the central wavelength of the microwave frequency comb obtained by this scheme and the comb line spacing can be adjusted, but the comb line power drops sharply from the center of the frequency comb to the outside, resulting in The bandwidth of the frequency comb is small

It can be seen that based on the above-mentioned schemes, it is still difficult to obtain ultra-wideband microwave frequency combs with adjustable comb distance, fine and sharp comb lines, and balanced power. Therefore, it is necessary to explore some new technologies for obtaining high-quality microwave frequency combs.

Images