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Compact and Low-Loss Coherent Mixer Based on High Δ ZrO2-SiO2 PLC

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5 Author(s)
Takahashi, M. ; Dept. of Fitel Photonics Lab., Furukawa Electr., Ichihara, Japan ; Uchida, Y. ; Yamasaki, S. ; Hasegawa, J.
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In this paper, we report design and characteristics of a compact coherent mixer based on high Δ planar lightwave circuit (PLC) which consists of ZrO2-doped silica glass. The PLC with 5% or more Δ is realized by employing ZrO2 as a dopant. Propagation loss of the fabricated 5.5%-Δ ZrO2-SiO2 PLC is reduced to 0.02 dB/cm by an optimized fabrication process. A coherent mixer is designed and fabricated by using ZrO2-SiO2 PLC and size of the mixer chip is reduced to 4 mm × 2 mm. Coupling loss between standard single-mode fiber and ZrO2-SiO2 PLC is reduced to less than 0.31 dB/facet by an optimized spot-size converter.

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Lightwave Technology, Journal of  (Volume:32 ,  Issue: 17 )