Reduction of phase-difference deviation in 90° optical hybrid over wide wavelength range

Yohei Sakamaki; Yusuke Nasu; Toshikazu Hashimoto; Kuninori Hattori; Takashi Saida; Hiroshi Takahashi

doi:10.1587/elex.7.216

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Reduction of phase-difference deviation in 90° optical hybrid over wide wavelength range

Yohei Sakamaki, Yusuke Nasu, Toshikazu Hashimoto, Kuninori Hattori, Takashi Saida, Hiroshi Takahashi

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Keywords: 90° optical hybrid, planar lightwave circuit

JOURNAL FREE ACCESS

2010 Volume 7 Issue 3 Pages 216-221

DOI https://doi.org/10.1587/elex.7.216

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Abstract

We describe a technique for reducing the wavelength-dependent phase-difference deviation between in-phase and quadrature components in an 90° optical hybrid consisting of four 3-dB couplers and a phase shifter. We fabricated the 90° hybrid with our proposed technique, which uses silica-based planar lightwave circuit technology. The fabricated 90° hybrid exhibits a low phase-difference deviation from 90° of less than 0.7° over the C- and L-bands, and will be useful in a digital coherent receiver for transmission systems operating at 100Gbit/s or more.

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