A new low crosstalk InP digital optical switch based on carrier-induced effects for 1.55-µm applications
Résumé
This letter demonstrates an original carrier-induced effects InP digital optical switch (DOS) designed to achieve a low optical crosstalk for 1.55-μm wavelength applications. It is based on a widened multimode Y-junction combined with a sinusoidal shape waveguide to increase the optical contrast ratio between the two output branches. The entire InP-InGaAsP-InP DOS was designed using a semi-vectorial three-dimensional beam propagation method. The fabricated InP DOS with λg = 1.3 μm heterostructure exhibits an optical crosstalk as low as -38.5 dB for a 33-mA switching current at 1.55-μm wavelength for a favourable polarized input light.