Ultra-compact variable optical attenuator based on slow light photonic crystal waveguide

Abstract

An ultra-compact variable optical attenuator based on slow light photonic crystal waveguide with thermooptic effect is demonstrated. Along with power consumption of as low as 30.7 mW, a variable attenuation range of 10 dB is experimentally achieved by shifting the transmission spectrum at about 4.6 nm. The length of the proposed device is only 20 µm.

Ultra-wideband optical diode based on photonic crystal 90° bend and directional coupler

“…An all-optical diode is a one-way device that can control unidirectional flows of optical signals, which will greatly benefit the development of the all-optical signal processing. In order to realize the on-chip integration of the optical devices, photonic crystals (PCs) have been put forward to pave the way, where the propagation of light resembles the movement of electron in semiconductors [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] . The unidirectional non-reciprocal PCs waveguides have attracted much interest of many researchers [3,4] .…”