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△ [15p-A502-8] Reduction of Optical Loss of Non-volatile Phase Change Phase Shifter Based on Ge2Sb2Te3S2 Operating at Mid-infrared Wavelength
Keywords:Si photonics, phase change material, optical phase shifter
We propose a record low-loss non-volatile phase PCM phase shifter operating at mid-infrared wavelengths based on Ge2Sb2Te3S2 (GSTS), which is a new Se-free widegap PCM. By using GSTS in the MIR range, the optical absorption of a PCM phase shifter can be considerably reduced. We achieved an optical loss of 0.29 dB for a π phase shift, which is the lowest loss ever reported for a PCM phase shifter integrated with a Si waveguide.