Current injection tunable monolithically integrated InGaAs-InAlGaAs asymmetric Mach-Zehnder interferometer using quantum-well intermixing

A compact highly efficient wavelength (de)multiplexer with channel spacing of 100 GHz has been realized with a monolithically integrated asymmetric 2 /spl times/ 2 Mach-Zehnder interferometer using a single step sputtered SiO/sub 2/-annealing quantum-well intermixing process. Wavelength tunability and asymmetric loss rebalancing of the device is demonstrated using current injection. Wavelength tuning over 0.8 nm is achieved with only 6 mA of injected current. An extinction ratio of more than 27 dB is obtained.