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Proceedings Paper

Polarization diversity circuit based on a double-core structure consisting of silicon photonic wire and silicon-oxinitride waveguide
Author(s): Koji Yamada; Hiroshi Fukuda; Tai Tsuchizawa; Toshifumi Watanabe; Hiroyuki Shinojima; Hidetaka Nishi; Sei-ichi Itabashi
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Paper 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.

Paper Details

Date Published: 18 February 2009
PDF: 7 pages
Proc. SPIE 7220, Silicon Photonics IV, 722002 (18 February 2009); doi: 10.1117/12.808066
Show Author Affiliations
Koji Yamada, NTT Corp. (Japan)
Hiroshi Fukuda, NTT Corp. (Japan)
Tai Tsuchizawa, NTT Corp. (Japan)
Toshifumi Watanabe, NTT Corp. (Japan)
Hiroyuki Shinojima, NTT Corp. (Japan)
Hidetaka Nishi, NTT Corp. (Japan)
Sei-ichi Itabashi, NTT Corp. (Japan)


Published in SPIE Proceedings Vol. 7220:
Silicon Photonics IV
Joel A. Kubby; Graham T. Reed, Editor(s)

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