We report on the design and fabrication of GexSi1−x Mach–Zehnder interferometers based on the thermo-optic effect. The modulators exhibit 8 dB of extinction with a π-phase-shift power requirement, Pπ, of 245 mW. The 3-dB bandwidth of these thermo-optic devices is 88 kHz. Finally, we present calculations indicating the effect of various parameters on the modulation of the Mach–Zehnder interferometer.
© 1992 Optical Society of America
Original Manuscript: July 6, 1992
Published: December 15, 1992
Robert A. Mayer, K. H. Jung, W. D. Lee, Dim-Lee Kwong, and Joe C. Campbell, "Thin-film thermo-optic GexSi1−x Mach–Zehnder interferometer," Opt. Lett. 17, 1812-1814 (1992)