A self-switching mechanism in Mach-Zehnder Interferometers is described. The input light signal is distributed unequally over the branches where Semiconductor Optical Amplifiers are placed as non-linear phase shifters. Unequal intensities yield a non-linear phase shift. The signals from the two branches are then recombined in an output coupler. If Pi/2-phase shift is reached, the signals are in phase. This effect can be used in the low-loss optical combiner circuit. In this device the transmission can be improved by more then 2 dB with respect to a passive 3-dB splitter. Fabrication, characterization and performance of the combiners are presented in this paper.
|Title of host publication||Proceedings 2004 ninth annual symposium of the IEEE/LEOS Benelux Chapter : December 2-3, 2004, Ghent, Belgium|
|Place of Publication||Gent|
|Publisher||Institute of Electrical and Electronics Engineers|
|Publication status||Published - 2004|