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Effective Noise Reduction by Electric Positive and Negative Feedback in Semiconductor Lasers

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4 Author(s)
Minoru Yamada ; Sch. of Electr. & Comput. Eng., Kanazawa Univ., Kanazawa, Japan ; Maruyam Huda ; Eiji Teraoka ; Yuji Kuwamura

Semiconductor lasers tend to generate excess intensity noise called the optical feedback noise in addition to the quantum noise. A noise reduction method using an electric positive and negative feedback loop between an optical detector and a semiconductor laser was demonstrated in this paper. The electric positive feedback was set in a high-frequency region, reducing the optical feedback noise, while the electric negative feedback was set in a frequency range lower than the positive-feedback frequency, resulting in the suppression of the quantum noise (optical shot noise). Noise reduction over 100-MHz frequency region and a reduction ability superior to that obtained by the superposition of high-frequency current were confirmed.

Published in:

IEEE Journal of Quantum Electronics  (Volume:45 ,  Issue: 10 )