Tunable asymmetric mode conversion using the dark-mode of three-mode waveguide system

Demonstration of mode conversion using anti-symmetric waveguide Bragg gratings.

We experimentally demonstrate a novel grating which only produces reflection with mode conversion in a two-mode waveguide. That characteristic can improve the performance of optical devices that currently use tilted Bragg gratings to provide the mode conversion. Tilted Bragg gratings produce also reflections without mode conversion which increases noise and crosstalk of the optical device.

Title Tunable single-mode slot waveguide quantum cascade lasers

Demonstration of mode conversion in an irregular waveguide.

Communications wavelength waveguide mode conversion is demonstrated in an irregular metal-walled structure that was designed by using multiresolution optimization. Strong scatter and a large number of degrees of freedom allowed high-efficiency conversion in a device having a length of just a few wavelengths. The fabrication approach draws on standard semiconductor processing. Mode-selective ref...

Circuit model for mode conversion in coplanar waveguide asymmetric shunt impedances - Electronics Letters

Eve is active, we need to determine the upper bound on the probability of the event that Alice and Bob do not both reject although secret-key agreement has not been successful. There are two cases in which this can occur: one is where Eve successfully guesses a = &(S) to impersonate Bob and makes Alice accept. The other case is where, after Eve saw&(S), she successfully guesses c = f,(S) to imp...

Exceptional points and asymmetric mode conversion in quasi-guided dual-mode optical waveguides

Non-Hermitian systems host unconventional physical effects that be used to design new optical devices. We study a non-Hermitian system consisting of 1D planar optical waveguides with suitable amount of simultaneous gain and loss. The parameter space contains an exceptional point, which can be accessed by varying the transverse gain and loss profile. When light propagates through the waveguide s...