Search

Grating fiber-chip coupler (GC) is a versatile scheme to couple light into submicron waveguides, particularly in SOI platform [1]. Typical GC is defined within a footprint of 10 × 10 μm to match the fiber mode field. The 10 μm wide waveguide is then adiabatically tapered (length ∼ 500 μm) down to a 400/500 nm single-mode waveguide. To reduce the taper length, focusing type grating was introduced and widely used [2]. One of the major issues with the focusing GC is the alignment tolerance and bandwidth limitation compared to linear GC. In this paper, we propose and demonstrate an ultra-compact taper structure with coupling efficiency of ∼92% for 1550 nm and 89% for 1310 nm and broad band operation.

We propose using a hydrogenated amorphous silicon waveguide for ultra-high-speed serial data waveform sampling. 320 Gbit/s serial optical data sampling is experimentally demonstrated with +12 dB intrinsic four wave mixing conversion efficiency.

Silicon-on-Insulator nanowires provide an excellent platform for nonlinear optical functions in spite of the two-photon absorption at telecom wavelengths. Work on both crystalline and amorphous silicon nanowires is reviewed, in the wavelength range of 1.5 to 2.5 μm.

We report on the development of low-loss photonic components fabricated in SiN for the development of a biophotonics platform. We discuss experimental demonstration of strip waveguides, MMI and evanescent couplers, fractal trees, AWGs and waveguide-integrated resonators.