3 August 2004 Injection-locked passively mode-locked semiconductor laser for optical heterodyne detection using a single axial mode
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Abstract
The optical heterodyne detection for an extremely densely channelized coherent communication systems using phase coherent optical combs is demonstrated by using a passively modelocked semiconductor laser injection locked to a master laser oscillator. The single sideband noise of the heterodyne beat tone at 13.160 GHz was reduced to -123 dBc/Hz at 100 kHz offset from the carrier by exploiting the excellent noise rejection performance of a commercially available microwave bandpass filter. A signal-to-noise ratio of over 65 dB/Hz has been achieved in a single channel filtered from two analog RF signals detuned by only 200 MHz. These results show improved signal-to-noise ratio and superior crosstalk reduction between densely packed neighboring channels via electrical manipulation of the optical heterodyne detection signal.
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Wangkuen Lee, Michael M. Mielke, Shahab Etemad, Peter J. Delfyett, "Injection-locked passively mode-locked semiconductor laser for optical heterodyne detection using a single axial mode", Proc. SPIE 5435, Enabling Photonic Technologies for Aerospace Applications VI, (3 August 2004); doi: 10.1117/12.541692; https://doi.org/10.1117/12.541692
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