title: Compact slanted grating couplers.
abstract: We present a compact and efficient design for slanted grating couplers (SLGC's) to vertically connect fibers and planar waveguides without intermediate optics. The proposed SLGC employs a strong index modulated slanted grating. With the help of a genetic algorithm-based rigorous design tool, a 20microm-long SLGC with 80.1% input coupling efficiency has been optimized. A rigorous mode analysis reveals that the phase-matching condition and Bragg condition are satisfied simultaneously with respect to the fundamental leaky mode supported by the optimized SLGC.
authors.forename: Bin
authors.initials: B
authors.lastname: Wang
authors.forename: Jianhua
authors.initials: J
authors.lastname: Jiang
authors.forename: Gregory
authors.initials: G
authors.lastname: Nordin