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A Vertical Germanium Thermooptic Modulator For Optical Interconnects

2009; Institute of Electrical and Electronics Engineers; Volume: 21; Issue: 4 Linguagem: Inglês

10.1109/lpt.2008.2010530

1941-0174

Yu‐Hsuan Kuo, Ying-An Huang, Tsang-Long Chen,

Optical Network Technologies

We proposed and demonstrated a novel vertical thermooptic modulator. A Ge-on-insulator device with bottom metal reflector utilizes a self-heating structure to change the temperature-dependent absorption coefficient and refractive index near the absorption edge, thus modulating the light intensity through its asymmetric Fabry-Perot cavity. The peak contrast ratio is 6.1 dB (and 8.7 dB) at 1561.8 nm (and 1563 nm) under 0.8-V (and 1.2-V) bias with 1.6-mW (and 3.6-mW) power consumption. This approach provides efficient vertical thermooptic modulators requiring smaller temperature change and lower operation voltage for optical interconnects.