Title :
Low-loss monolithic integration of balanced twin-photodetectors with a 3 dB waveguide coupler for coherent lightwave receivers
Author :
Deri, R.J. ; Sanada, T. ; Yasuoka, N. ; Makiuchi, M. ; Kuramata, A. ; Hamaguchi, H. ; Wada, O. ; Yamakoshi, S.
Author_Institution :
Bellcore, Red Bank, NJ, USA
Abstract :
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.<>
Keywords :
integrated optics; optical couplers; optical losses; optical waveguides; photodetectors; receivers; 1.54 micron; balanced operation; balanced twin-photodetectors; coherent lightwave receivers; large-mode size guides; local oscillator intensity noise suppression; low-capacitance lateral detectors; mirror coupling; monolithic circuit; monolithic integration; optical insertion loss; top-illuminated detectors; waveguide coupler; Coupling circuits; Detectors; Insertion loss; Integrated optics; Mirrors; Monolithic integrated circuits; Optical losses; Optical noise; Optical waveguides; Photodetectors;
Journal_Title :
Photonics Technology Letters, IEEE
