WAVELENGTH-DIVISION MULTI DEMULTIPLEXER WITH ARRAYED-WAVE-GUIDE GRATING/

Recently, a wavelength division multi/demultiplexing system has been v iewed with keen interest because it is possible to increase the transm ission capacity and system flexibility. An arrayed waveguide grating ( AWG) type of Multi/demultiplexer which is one of the key components to realize such a system has been developed by using Planar Lightwave Ci rcuits (PLCs). Newly designed optical circuits have been incorporated into the AWG to control the center wavelength and to expand the pass b and width. The 3dB pass band width is 1.4 times that of a conventional AWG. It is confirmed that the newly developed AWG has low polarizatio n dependence, low temperature dependence and high reliability.