Tuning performance and spectral selectivity of widely tunable vertical Mach-Zehnder lasers

The filtering mechanism, spectral selectivity, and tuning performance of th e vertical Mach-Zehnder (VMZ) laser diode are studied. Wavelength selection in this device is due to the interference of two modes with different and electronically controllable optical path lengths in analogy to a common Mac h-Zehnder interferometer, Different design approaches for the VMZ laser are investigated. The calculations presented show that tuning ranges between 5 0 nm and 100 nm with side-mode suppression ratios (SSR's) of more than 20 d B are feasible. Designs with tuning ranges of about 35 nm show SSR values o f over 30 dB at the 1.55-mu m wavelength enabling the realization of widely tunable laser diodes with full wavelength access within the tuning range, suitable for applications in optical communication systems.