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Elimination of polarization sensitivity in silica-based wavelength division multiplexer using a polyimide half waveplate

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6 Author(s)
Inoue, Y. ; NTT Opto-Electron. Labs., Ibaraki, Japan ; Takahashi, H. ; Ando, Shinji ; Sawada, T.
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This paper proposes a low-loss technique for eliminating polarization sensitivity in a silica-based planar lightwave circuit (PLC) which uses a polarization mode converter formed at the center of the circuit. This converter consists of a waveguide gap housing a polyimide half waveplate. The excess loss of the converter was drastically reduced to 0.26 dB with a Δ=0.75% waveguide by employing an 18 μm-wide waveguide gap and a 14.5 μm-thick polyimide half waveplate. A polarization mode conversion crosstalk of -37 dB was achieved at 1.55 μm. Using this converter, we successfully eliminated the polarization sensitivity in some silica-based PLC-type wavelength division multiplexers. The converter is also insensitive to temperature and offers long term stability

Published in:

Lightwave Technology, Journal of  (Volume:15 ,  Issue: 10 )

Date of Publication:

Oct 1997

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