Ultracompact variable optical attenuator based on photonic crystal waveguide

Qiang Zhao; Kaiyu Cui; Yidong Huang

doi:10.1117/12.904382

28 November 2011 Ultracompact variable optical attenuator based on photonic crystal waveguide

Qiang Zhao, Kaiyu Cui, Yidong Huang

Proceedings Volume 8308, Optoelectronic Materials and Devices VI; 83080B (2011) https://doi.org/10.1117/12.904382
Event: SPIE/OSA/IEEE Asia Communications and Photonics, 2011, Shanghai, China

Abstract

We demonstrated and fabricated a 20μm-long ultra-compact variable optical attenuator based on thermo-optical effect with slow light photonic crystal waveguide (PCWG). In simulation, we optimize the line-defect width and radius/period ratio (r/a) of the PCWG for deep photonic band gap and large slope photonic band edge. An r/a=140nm/410nm W1 PCWG is selected for its -60dB depth and 36dB variable attenuation range when the tunable refractive index change is 0.01. We also study different shapes of micro-heaters for low power consumption and high heat transfer efficiency. A 24.6mW and 75.9% heat transfer efficiency are achieved in a 2μm-wide right-angle-shaped micro-heater. In experiment, A 4.6nm red shift at the cutoff wavelength of the fundamental mode and a 10dB tunable attenuation range are achieved through tuning the temperature of the W1 PCWG by an 4.7μm-wide aluminum micro-heater with a maximum power consumption as low as 30.7mW.

Citation Download Citation

Qiang Zhao, Kaiyu Cui, and Yidong Huang "Ultracompact variable optical attenuator based on photonic crystal waveguide", Proc. SPIE 8308, Optoelectronic Materials and Devices VI, 83080B (28 November 2011); https://doi.org/10.1117/12.904382

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