Title :
A mode-evolution-type integrated-optical beam combiner for coherent receivers
Author :
Smith, D.A. ; Baran, J.E. ; Jackel, J.L. ; Wagner, R.E. ; Welter, R.
Author_Institution :
Bellcore, Red Bank, NJ, USA
fDate :
4/1/1991 12:00:00 AM
Abstract :
An integrated-optic sum-and-difference optical beam combiner for coherent receivers based on adiabatic mode evolution in an asymmetric waveguide junction is described. The device was packaged as a 2*2 fiber-compatible LiNbO/sub 3/ chip, and operated as a 180 degrees optical hybrid for combining arbitrary input polarization, exhibiting excellent balance and moderate loss. The advantage of this component over previously studied directional coupler beam combiners is the absence of a strict interaction length requirement for obtaining balanced separation. Integration of this component with a passive mode-evolution-type polarization splitter will result in polarization-diversity receivers with broad constraints on processing, design, and wavelength of operation.<>
Keywords :
integrated optics; lithium compounds; optical communication equipment; optical couplers; receivers; 180 degrees optical hybrid; LiNbO/sub 3/; adiabatic mode evolution; asymmetric waveguide junction; balance; balanced separation; coherent receivers; fiber-compatible LiNbO/sub 3/ chip; integrated-optical beam combiner; loss; passive mode-evolution-type polarization splitter; polarization-diversity receivers; Optical beams; Optical devices; Optical fiber couplers; Optical fiber devices; Optical fiber losses; Optical fiber polarization; Optical receivers; Optical waveguides; Packaging; Waveguide junctions;
Journal_Title :
Photonics Technology Letters, IEEE
