Experimental investigation of optical frequency combs performance through gain switched DFB laser with narrow pulse modulation signal

Kebin Tong; Zhenhui Du; Liming Yuan; Jinyi Li

doi:10.1117/12.2612034

26 July 2022 Experimental investigation of optical frequency combs performance through gain switched DFB laser with narrow pulse modulation signal

Kebin Tong, Zhenhui Du, Liming Yuan, Jinyi Li

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Proceedings Volume 12279, 2021 International Conference on Optical Instruments and Technology: Optical Sensors and Applications; 122790G (2022) https://doi.org/10.1117/12.2612034
Event: 2021 International Conference on Optical Instruments and Technology, 2022, Online Only

Abstract

It is small footprint, simplicity, and inexpensive that the direct modulation of a semiconductor laser to generate optical frequency combs (OFCs). However, their OFCs spectral characteristics are heavily dependent on the modulation signal waveform and the current parameters of the laser. It is essential that the research of more useful modulation signal and driving conditions to optimize the OFC performance. We evaluated the performance of the OFCs under gain-switched distributed feedback (DFB) lasers with several common modulation waveforms. It is showed that the relaxation oscillation frequency (ROF) was a restricted condition on the coherence of the OFC under the gain-switching (GS) mode when modulation frequency lower than ROF. We demonstrated that OFCs can be realized in a gain-switched DFB laser with a narrow pulse-width modulation signal under a lower modulation frequency than the ROF of the laser. The OFCs was realized with a comb spacing of 100 MHz, spectral width of 2 GHz, and carrier-to-noise ratio of 29.01 dB by a narrow pulse modulation signal with modulation frequency of 50 MHz at I_ON = 38.72 mA, I_OFF = 0.12 mA, pulse width of 1 ns. The performance of the OFCs under the narrow pulse and sinc modulation signals with different modulation frequency parameters and current driving conditions is further evaluated. This method of tuning the pulse modulation signals to achieve optimization of OFC performance has the advantages of simple operation, flexible settings, and inexpensive. This will have greater application value in high-resolution spectroscopy detection, especially a dual comb spectrum technology.

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Kebin Tong, Zhenhui Du, Liming Yuan, and Jinyi Li "Experimental investigation of optical frequency combs performance through gain switched DFB laser with narrow pulse modulation signal", Proc. SPIE 12279, 2021 International Conference on Optical Instruments and Technology: Optical Sensors and Applications, 122790G (26 July 2022); https://doi.org/10.1117/12.2612034

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KEYWORDS

Modulation

Pulsed laser operation

Radio over Fiber

Continuous wave operation

Semiconductor lasers

Frequency combs

Spectrum analysis

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