Silicon-on-insulator (SOI) delay-line interferometer with low polarization-dependent frequency shift for 40 Gbit/s DPSK demodulation

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Abstract
A 40 Gbit/s SOI rib-waveguide delay-&-add interferometer is presented. Across the C-band we demonstrate high uniformity, low loss, PDL, and PDFS (< 1 GHz). RZ & NRZ DPSK balanced-detection measurements at 40 Gbit/s are included. (2 pages)