20 October 2006 Analysis of fiber-based coherent detection employing optical preamplifier and time-domain filter
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Proceedings Volume 6371, Photonic Sensing Technologies; 63710D (2006); doi: 10.1117/12.686208
Event: Optics East 2006, 2006, Boston, Massachusetts, United States
We report on a novel fiber based coherent detection system employing an optical preamplifier, a spectrum bandpass filter, and a time-domain filter. The time-domain filter, a synchronous time gate, reduces the in-band Amplified Spontaneous Emission (ASE ) beat noise, which cannot be achieved by the spectrum bandpass filter alone. In preliminary experiments with a 100 GHz bandpass filter, no degradation is observed from the optically preamplified coherent detection compared to pure coherent detection. With a 10 ns pulse width, 500 kHz repetition rate, and 10 pW input power, 2.78 dB and 1 dB signal-to-noise (SNR) improvement has been achieved, respectively, when 5% and 50% time gating duty cycle is used.
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Youming Chen, William Torruellas, Brian L. Mark, Ralph Burnham, Horacio Verdun, "Analysis of fiber-based coherent detection employing optical preamplifier and time-domain filter", Proc. SPIE 6371, Photonic Sensing Technologies, 63710D (20 October 2006); doi: 10.1117/12.686208; https://doi.org/10.1117/12.686208

Optical filters

Bandpass filters

Signal detection

Signal to noise ratio

Lab on a chip

Optical amplifiers

Interference (communication)

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