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Chirped high-contrast-grating hollow-core waveguide demonstrates a >10× loss reduction. Simulation shows that a propagation loss as low as 0.04 dB/cm can be achieved with a nonlinear coefficient on the order of 10−5 /W/m.
Nondegenerate mirrorless four-wave mixing oscillation with frequency tunability is proposed in silicon nonlinear waveguide by using higher spatial mode. As low as ∼2W threshold power is obtained in several centimeters long waveguide.
We numerically analyze chromatic dispersion in tightly curved strip and slot waveguides with high index contrast. Zero-dispersion-wavelength may have a shift over 220 nm when bending radius is reduced to a few microns.
Vertically-slotted waveguides are used to achieve low nonlinearity. Compared with strip waveguide, it demonstrates a >25× reduction in the nonlinear coefficient for a 100-nm wavelength range.
Dual slot waveguides incorporate a sub-core in the slot, so that the guided beam is confined two-dimensionally. The modification enlarges the room for tailoring dispersive properties and birefringence. Both zero-dispersion and constant-dispersion points are demonstrated.
We propose a dispersion-flattened silicon waveguide that exhibits a flat and near-zero dispersion within ±16 ps/nm/km over a 550-nm wavelength range. Averaged dispersion can be shifted from negative to positive with almost the same flatness.
A silicon slotted ring resonator with flattened dispersion in the cavity is proposed to produce uniform spectral lines in on-chip frequency comb generations. Standard deviation of the free spectral range is improved by 250 times as compared to a strip waveguide in the same size.
We propose a compact silicon microring-based analog modulator for generation of 10-GHz sub-octave analog signals, which exhibit high optical modulation-index of up to 46% and carrier-to-noise ratio (CNR) of 57 dB. In fiber transmission, the CNR can be improved further by 10 dB with chromatic dispersion.
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