Tunable time delays in photonic-crystal waveguides

Abstract

We study tunable time-delay devices in which the time delay is tuned by changing the group velocity of the propagating signal. The device is designed to place the operating frequency near a photonic band edge. This enhances the change in delay for a given tuning range of the device refractive index. Here we provide an extended explanation of mode symmetry, nomenclature, and the complete band structure of a sample, integrated device to aid the understanding of our previously published work.

On-chip optical true time delay lines featuring one-dimensional fishbone photonic crystal waveguide

“…6 These photonic solutions consist of discrete or low dispersion optical components and therefore are bulky in size and have stringent alignment requirements. Recently, various on-chip OTTDL structures have been investigated to realize ultra-compact and robust true time delay (TTD) lines such as photonic crystal waveguides (PCWs), [7][8][9][10] polymer waveguides, 11 and graphene based waveguides. 12 Among these structures, due to the strong optical confinement 13 and slow-light effect, 14 silicon PCW TTD lines can significantly reduce the footprint and power consumption.…”