Experimental Investigations on Generation of Tunable Microwave Frequency Combs by Cascading Lasers

doi:10.12068/j.issn.1005-3026.2025.20240012

Abstract

Abstract:

In order to obtain high-performance microwave frequency combs， an all-optical scheme for generating a tunable microwave frequency comb using three lasers in cascading injection is proposed. This scheme does not require external modulation from a microwave signal source， making it a fully optical generation device. The experimental setup and working principle are introduced. The impacts of various factors， namely the pump current， injected optical power， feedback optical power， and central frequency detuning between two lasers， on the number of comb lines， bandwidth， peak maximum power， and frequency spacing of the generated microwave frequency comb signals are analyzed by experiments. The results indicate that when the power attenuation values of VOA1， VOA2， and VOA3 are 13， 13 and 21.5 dB， respectively， the pump current of SL is 56.1 mA， and the frequency detuning between ML and IL is 70.625 GHz， a microwave frequency comb signal with a bandwidth of 11.87 GHz can be obtained.

Key words: microwave frequency comb （MFC）, optically generated microwave, laser, optical injection, optical feedback

CLC Number:

TN 248.4

Yong-chao YANG, Qing-chun ZHAO, Tian-yi ZHU, Bin WU. Experimental Investigations on Generation of Tunable Microwave Frequency Combs by Cascading Lasers[J]. Journal of Northeastern University(Natural Science), 2025, 46(6): 26-31.

Figures/Tables 6

Fig.1 Experimental diagram of the generation of the microwave frequency comb based on the cascading injection utilizing three lasers

Fig.2 MFC obtained when VOA1 power attenuation value is set to 10 dB

Fig.3 Influence of SL pump current on the generated MFC signals

Fig.4 Influence of the different power attenuation values of VOA1 and VOA2 on the generated MFC signals

Fig.5 Influence of different power attenuation values of VOA3 on the generated MFC signals

Fig.6 Influence of frequency detuning on the generated MFC signals

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