Performance analysis on cascaded asymmetric photonic crystal Mach-Zehnder tunable filter.

A cascaded asymmetric photonic crystal Mach-Zehnder filter structure is proposed to improve the quality factor ( Q value) and the sensitivity of the tunable optical filter. The mathematical relationship between the output wavelength of M-Z filter and the voltage applied on the multilayer PZT is established. The simulation results show that the full width at half maximum can be decreased from 17 nm to 9 nm, in addition, the transmission peak wavelength varies by adjusting the applied voltage and the sensitivity can attain to 0.7 nm/V by using the multilayer PZT, which can achieve tunable filtering effectively. [ABSTRACT FROM AUTHOR]