Output spectral characteristics of laser diodes under low-frequency modulation

Zhongsheng Luo; Meidun Zhang

doi:10.1117/12.347948

28 April 1999 Output spectral characteristics of laser diodes under low-frequency modulation

Zhongsheng Luo, Meidun Zhang

Proceedings Volume 3666, International Conference on Fiber Optics and Photonics: Selected Papers from Photonics India '98; (1999) https://doi.org/10.1117/12.347948
Event: International Conference on Fiber Optics and Photonics: Selected Papers from Photonics India '98, 1998, New Delhi, India

Abstract

It is important to know the spectral characteristics of light sources for optical coherence systems. From experimental view, this paper systematically investigates the spectral characteristics of two kinds of laser diodes whose structures are buried heterostructure (BH) and transverse junction stripe (TJS), and they are modulated directly by low-frequency sinusoidal current signal. The modulation frequency is less than 100 kHz. From our experiment results, we find that, under the low frequency modulation, when the modulation depth is over some values, the spectra of these laser diodes which originally are single longitudinal mode will become multi- longitudinal modes. This results are different from the general idea. Besides, we find that, under the same operating conditions, for those laser diodes which have greater sidemode suppression ratio, or when the modulation frequency is increased, it must increase the modulation depth for getting multi-longitudinal modes. Moreover, we find that TJS laser diodes are easier to appear sidemodes than BH laser diodes. To the authors' knowledge, these phenomena have not yet been reported.

Citation Download Citation

Zhongsheng Luo and Meidun Zhang "Output spectral characteristics of laser diodes under low-frequency modulation", Proc. SPIE 3666, International Conference on Fiber Optics and Photonics: Selected Papers from Photonics India '98, (28 April 1999); https://doi.org/10.1117/12.347948

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