Passive Components Based on Two-dimensional Photonic Crystals

Possibilities of the use and the results of modeling of two-dimensional photonic crystal (PhC) spectral demultiplexer were proposed and investigated. Several spectral demultiplexers/multiplexers are designed: to separate the channels with wavelengths of 1490 and 1550 nm (Passive optical network, PON); 1270 and 1310 nm (IEEE 802.3 40GBASE-LR4); 1270 and 1290 nm (IEEE 802.3 40GBASE-LR4). Proposed two-channel demultiplexers based on PhC are designed to separate the channels with wavelengths which widely used in telecommunications. These demultiplexers consist of circular silicon rods in rectangular lattice surrounded by air with radius of circular is 0.2a (a - lattice constant). These devices are based on wavelength channel splitters by using different filters. One filter with three defective rods inside it and another filter with tapered region are placed at the T-junction. Selection of model geometric parameters is based on the analysis of photonic band gap maps. The computations were carried out using the Optiwave's OptiFDTD 8 software.