Dual-channel microwave frequency comb generator based on optoelectronic feedback VCSEL

Abstract

The invention discloses a dual-channel microwave frequency comb generator which comprises a signal generator module, an optoelectronic feedback module and a control module. The signal generator module comprises a 850nm vertical cavity surface emitting laser VCSEL, a temperature controller, a current controller, an aspheric lens, an isolator, a half-wave piece and a polarization beam splitter. The optoelectronic feedback module comprises a photodetector, a power amplifier, a power attenuator and a radio frequency bias. The control module comprises a data acquisition card which is connected with the signal generator module and the optoelectronic feedback module and a computer, and is used for adjusting external parameters of a laser system and acquiring data. The microwave frequency comb generator uses the VCSEL as a core device, has the advantages of small whole system volume, easy integration and low cost, and can acquire dual-channel microwave frequency comb signals.

Description

technical field [0001] The invention relates to a dual-path microwave frequency comb generator based on a photoelectric feedback VCSEL, which belongs to the field of information technology. Background technique [0002] Microwave frequency comb refers to a series of comb-shaped microwave signals with equal frequency intervals. At present, microwave frequency comb generators have been widely used in national production and life. For example, microwave frequency comb signals are often used as harmonic signal sources in phase-locked loops or for measurement in electromagnetic interference and calibration of spectrum analyzers; microwave frequency comb signals can be used for electromagnetic compatibility (EMC) testing; in addition, microwave frequency Comb signals are also widely used in military fields such as electronic radar countermeasures, millimeter wave communications, and military reconnaissance. [0003] Traditional microwave frequency generation technologies are bas...

AI Technical Summary

Problems solved by technology

Although the microwave frequency comb generated by electrical means has a bandwidth of several GHz or even more than a dozen GHz, its application is greatly limited because the comb distance cannot be adjusted flexibly.

In terms of using optical solutions to generate microwave frequency combs, the current main method is to use optical frequency combs to convert photodetectors to obtain microwave frequency comb signals. However, this kind of frequency comb usually needs to introduce complex spectral dispersion management, which leads to The system for obtaining microwave frequency combs from frequency combs is relatively complicated, and the system cost is also relatively expensive

In addition, microwave frequency comb signals with harmonics up to GHz level can also be experimentally obtained by using optical nonlinear effects, but the obtained microwave frequency combs still have problems such as unbalanced comb line power and many non-harmonic burrs

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