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A novel design of large bandwidth, fabrication tolerant, CMOS-compatiblecompact tapers (15 um) have been proposed and experimentally demonstrated insilicon-on-insulator. The proposed taper along with linear grating couplers forspot-size conversion exhibits no degradation in the coupling efficiencycompared to a standard focusing grating in 1550 nm band. A single taper designhas a broadband operation over 600 nm that can be used in O, C and L-band. Theproposed compact taper is highly tolerant to fabrication variations; 80 nmchange in the taper width and 200 nm in end waveguide width varies the tapertransmission by <0.4 dB. The footprint of the device i.e. taper along with thelinear gratings is ~ 250 {\mu}m2; this is 20X smaller than the adiabatic taperand 2X smaller than the focusing grating coupler.

Ultra-compact low-loss broadband waveguide taper in silicon-on-insulator