Fabrication, polarisation and wavelength insensitive optical switch∕attenuator based on adiabatic mode multiplexer

Experimental results of an adiabatic mode multiplexer (AMM) based novel 2/spl times/2 optical switch/variable optical attenuator that consists of a symmetric Y-branch interferometer (mode converter) and adiabatic mode multiplexer/demultiplexer pair are presented. It is shown that both normally cross and bar designs have identical optical performance. Extinction ratio without thermal activation is ...