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Resonant Modulation of Semiconductor Lasers beyond 60 GHz Using Strong Optical Feedback |
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PP: 5-10 |
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Author(s) |
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Fumio Koyama,
Moustafa F. Ahmed,
Ahmed H. Bakry,
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Abstract |
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| We report on the use of strong external optical feedback to enhance the modulation response of semiconductor lasers over
a frequency passband around modulation frequencies higher than 60 GHz. We show that this modulation enhancement is a type of
photon-photon resonance (PPR) of oscillating modes in the external cavity formed between the laser and the external reflector. The
study is based on a time-delay rate equation model that takes into account both the strong feedback and multiple reflections in the
external cavity. We examine the harmonic and intermodulation distortions associated with single and two-tone modulations in the mmwave
band of the resonant modulation. We show that compared with solitary lasers modulated around the carrier-photon resonance
frequency, the present mm-wave modulated signal has lower distortions. |
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