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Low-loss monolithic integration of balanced twin-photodetectors with a 3 dB waveguide coupler for coherent lightwave receivers

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8 Author(s)
R. J. Deri ; Bellcore, Red Bank, NJ, USA ; T. Sanada ; N. Yasuoka ; M. Makiuchi
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Low-loss monolithic integration of a 3-dB waveguide coupler with twin photodetectors using large-mode size guides, mirror coupling, and low-capacitance lateral detectors is demonstrated. Waveguide-mirror integration introduces only approximately=1 dB optical insertion loss at 1.54 mu m wavelength, compared to top-illuminated detectors. Full balanced operation of the monolithic circuit with 33-dB local oscillator intensity noise suppression is demonstrated.<>

Published in:

IEEE Photonics Technology Letters  (Volume:2 ,  Issue: 8 )