A Zn-DIFFUSED MACH-ZEHNDER MODULATOR ON LITHIUM NIOBATE AT 1.55-μM WAVELENGTH

摘要

Zn-diffused Mach-Zehnder intensity modulators operating at 1.55-μm wavelength are demonstrated on a z-cut and a y-cut LiNbO{sub}3 substrate for the first time, The switching voltages are measured and the corresponding values of switching voltage-length product are 9.6 V-cm and 13.5 V-cm for the z-cut and y-cut modulators, respectively. Both the modulated extinction ratios are about 20 dB, The results show that the Zn-diffused modulators not only have electro-optic tunability as great as that of the Ti-diffused ones, but also have more flexibility for device fabrication.