Quantum model of light transmission in array waveguide gratings

Slow-Light in Nonuniform Quantum Dot Waveguide

We analyzed a new variable all-optical buffer using semiconductor quantum dots (QD). We show that an Ids-InGaAs-GaAs QD waveguide with 20meV inhomogeneous linewidth can achieve substantial buffering with a novel unbalanced multi-wavelength pumping scheme. Introduction: The advancement of 111-V semiconductor quantum dots (QD) has made many interesting applications, such as ultra-low threshold di...

Nonreciprocal waveguide Bragg gratings.

The use of a complex short-period (Bragg) grating which combines matched periodic modulations of refractive index and loss/gain allows asymmetrical mode coupling within a contra-directional waveguide coupler. Such a complex Bragg grating exhibits a different behavior (e.g. in terms of the reflection and transmission spectra) when probed from opposite ends. More specifically, the grating has a s...

4 Arrayed Waveguide Gratings

Thermal Behavior of Waveguide Gratings

We investigate the design of binary grating structures, e.g. resonance waveguide filters (RWFs), with subwavelength feature sizes, taking the temperature dependence of different material parameters into account. Our final goal is to demonstrate devices with athermal operation. We design the binary grating structures to be made in polymer substrates, such as polycarbonate (PC), due to their pote...

Apodized photonic crystal waveguide gratings.

Apodized photonic crystal (PC) waveguide gratings are proposed to suppress sidelobes which appear in reflection spectra of usual PC waveguide gratings. By using specific functions (Gauss and Gauss-cosine functions) for the longitudinal refractive index distribution, it is possible to suppress sidelobes in the reflection spectra of PC waveguide gratings efficiently. The apodization is realized b...