O-band surface-grating-coupled Si wavelength demultiplexing filter using cascaded directional couplers with 30-nm passband linewidth, 6-dB insertion loss and 23.4-dB polarization extinction is demonstrated for 64-Gbit/s NRZ-OOK with WDM channel extinction enhanced from 8.9-dB@1330nm to 14.6-dB@1325 nm.
We design a waveguide crossing with composite subwavelength (SW) structures, i.e., bridged SW grating (BSWG) waveguide structures and diagonally periodic holes (DPHs), on a partial parabolic single layer crossing (PPSLC) to improve its transmission. The BSWG is located before/after the input/output regions of the PPSLC and the DPHs are in the crossing region of the PPSLC. This waveguide crossing occupies a footprint of 6.2 μm × 6.2 μm upon a silicon-on-insulator wafer with 220-nm silicon device layer on 2-μm buried oxide. We successfully gain simulated results of the transmission up to 98.72% (−0.056 dB) and the crosstalk as low as −65 dB at an input wavelength of 1.55 μm.
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