IEICE Electronics Express
Online ISSN : 1349-2543
LETTER
Reduction of phase-difference deviation in 90° optical hybrid over wide wavelength range
Yohei SakamakiYusuke NasuToshikazu HashimotoKuninori HattoriTakashi SaidaHiroshi Takahashi
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JOURNALS FREE ACCESS

2010 Volume 7 Issue 3 Pages 216-221

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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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© 2010 by The Institute of Electronics, Information and Communication Engineers
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