Title :
InP-based 10-GHz bandwidth polarization diversity heterodyne photoreceiver with electrooptical adjustability
Author :
Ghirardi, F. ; Brandon, J. ; Huet, F. ; Carré, M. ; Thomas, J. ; Bruno, A. ; Carenco, A.
Author_Institution :
Lab. de Bagneux, CNET, Bagneux, France
fDate :
7/1/1994 12:00:00 AM
Abstract :
A polarization diversity optical receiver, integrated with two pairs of balanced photodiodes in the InP/InGaAsP material system, is described. This circuit includes two polarization splitters based on modal birefringence and, for the first time, adjustable 3-dB TE and TM directional couplers (relaxing fabrication tolerances). On-chip losses are below 2.5 dB (TE) and 5.5 dB (TM). Waveguide to PIN coupling efficiency is >95%. Polarization crosstalk is in the 9-10-dB range, 3-dB couplers balance can be recovered, and common mode rejection ratio (CMRR) lower than -30 dB is obtained and remains below -20 dB over 6 GHz. Balanced receiver circuit 3-dB bandwidth is in excess of 10 GHz.<>
Keywords :
III-V semiconductors; birefringence; crosstalk; directional couplers; electro-optical devices; gallium arsenide; gallium compounds; indium compounds; integrated optoelectronics; light polarisation; optical couplers; optical receivers; p-i-n photodiodes; 10 GHz; 2.5 dB; 5.5 dB; 95 percent; InP-InGaAsP; InP-based polarization diversity heterodyne photoreceiver; InP/InGaAsP material system; adjustable transverse electric directional couplers; adjustable transverse magnetic directional couplers; balanced photodiodes; balanced receiver circuit bandwidth; common mode rejection ratio; electrooptical adjustability; modal birefringence; on-chip losses; polarization crosstalk; polarization splitters; waveguide to PIN coupling efficiency; Bandwidth; Birefringence; Circuits; Directional couplers; Indium phosphide; Optical materials; Optical polarization; Optical receivers; Photodiodes; Tellurium;
Journal_Title :
Photonics Technology Letters, IEEE
