Polarization diversity circuit based on a double-core structure consisting of silicon photonic wire and silicon-oxinitride waveguide

Koji Yamada; Hiroshi Fukuda; Tai Tsuchizawa; Toshifumi Watanabe; Hiroyuki Shinojima; Hidetaka Nishi; Sei-ichi Itabashi

doi:10.1117/12.808066

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17 February 2009 Polarization diversity circuit based on a double-core structure consisting of silicon photonic wire and silicon-oxinitride waveguide

Koji Yamada, Hiroshi Fukuda, Tai Tsuchizawa, Toshifumi Watanabe, Hiroyuki Shinojima, Hidetaka Nishi, Sei-ichi Itabashi

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Proceedings Volume 7220, Silicon Photonics IV; 722002 (2009) https://doi.org/10.1117/12.808066
Event: SPIE OPTO: Integrated Optoelectronic Devices, 2009, San Jose, California, United States

Abstract

We devised a silicon photonic circuit with polarization diversity. The circuit consists of polarization splitters and rotators. The splitter is based on simple 10-micrometer-long directional couplers. The polarization extinction ratio is 23 dB and excess loss is less than 0.5 dB. The rotator consists of a silicon waveguide embedded in an off-axis siliconoxynitride waveguide. A 35-micrometer-long rotator gives a rotation angle of more than 72 degrees and excess loss of about 1 dB. Both devices can be made by using planar fabrication technology and do not require a complex structure such as three-dimensional forming. Using these devices, we developed a polarization diversity circuit for a ringresonator wavelength filter. The polarization dependent loss of the filter with polarization diversity is about 1 dB. A 10- Gbps data transmission with scrambled polarization is demonstrated.

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Koji Yamada, Hiroshi Fukuda, Tai Tsuchizawa, Toshifumi Watanabe, Hiroyuki Shinojima, Hidetaka Nishi, and Sei-ichi Itabashi "Polarization diversity circuit based on a double-core structure consisting of silicon photonic wire and silicon-oxinitride waveguide", Proc. SPIE 7220, Silicon Photonics IV, 722002 (17 February 2009); https://doi.org/10.1117/12.808066

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