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We report our advances in development of subwavelength engineered metamaterial structures in silicon waveguides, specifically high-efficiency fiber-chip couplers, ultra-broadband surface grating couplers and nanophotonic beam splitters, evanescent field waveguide sensors and on-chip Fourier-transform spectrometers.
Grating based fiber-chip couplers are an excellent scheme to couple between a sub-micron waveguide and an optical fiber. However, the operation bandwidth of the grating couplers is restricted to a particular wavelength band though high-coupler efficiency is achievable. An application such as Passive Optical Networks that use both O and C-band, it becomes essential to that grating couplers can be operated...
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...
In optical telecommunication technology the capacity of the transmission bandwidth will soon be achieved [1]. In addition to the wavelength, polarization and phase of the light, one can increase the spatial dimension of the optical fiber core as a fourth degree of freedom to enhance the transmission capacity. This can be done by increasing the diameter of the fiber core itself and, hence, applying...
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