Journal
OPTICS EXPRESS
Volume 25, Issue 9, Pages 10196-10203Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.25.010196
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Funding
- Defense Research and Development Organization, Government of India [ERIP/ER/1401134/M/01/1864/D(RD)/1581]
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A novel design of large bandwidth, fabrication tolerant, CMOS-compatible compact tapers (15 mu m) have been proposed and experimentally demonstrated in silicon-oninsulator. The proposed taper along with linear grating couplers for spot-size conversion exhibits no degradation in the coupling efficiency compared to a standard focusing grating in 1550 nm band. A single taper design has a broadband operation over 600 nm that can be used in O, C and L-band. The proposed compact taper is highly tolerant to fabrication variations; +/- 80 nm change in the taper width and +/- 200 nm in end waveguide width varies the taper transmission by <0.4 dB. The footprint of the device i.e. taper along with the linear gratings is similar to 250 mu m(2); this is 20X smaller than the adiabatic taper and 2X smaller than the focusing grating coupler. (C) 2017 Optical Society of America
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