Eight-channel integrated device for electro-optic modulation and dense wavelength division multiplexing based on photonic crystals

Abstract

We propose an eight-channel integrated device for electro-optic modulation and dense wavelength division multiplexing based on photonic crystals. The device consists of eight photonic crystal AAH cavities and eight reflection cavity filters to contribute a modulation module and a dense wavelength division multiplexing module, respectively. First, the physical model of the eight-channel integrated device is established, and then modeling and analyzing the transmission performance of the single channel modulator according to the coupled mode theory. The parameters of the proposed device are calculated by two dimensional finite-difference time-domain method for verification. The numerical results shows that the minimum insertion loss, channel crosstalk in the “on” state are 0.24 dB and −17.8 dB, respectively, and the extinction ratio in the “off” state is higher than 19.3 dB. The designed eight-channel integrated device has the advantages of low loss, small size (114.81×16×0.22)μm3 and easy cascading structure, which can realized “on” and “off” modulation with channel space of 0.8 nm, dense wavelength division multiplexing function in the operating wavelength range of 1552.8 nm–1558.4 nm and applied in data center and highly integrated optical communication system.