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A hybrid multiplexer (HMUX) for wavelength/mode-division (WDM/MDM) is proposed, based on photonic crystals (PCs) and consisting of two asymmetrical parallel waveguides (APWs). It can realize TE0 and TE1 modes multiplexing at wavelengths of 1310nm and 1550nm, based on the coupled mode theory. The finite-difference time-domain method is used for simulation. The simulation results show that the performance...
A model of cascaded narrow bandpass filter is proposed. The structure of the filter with a resonator and two reflectors is used as the cascaded unit. The parameters of the cascaded filter are analyzed theoretically by coupled mode theory and transfer matrix method. The studies illustrate that the bandwidth of the filter with two reflectors could be controlled by adjusting the phase parameters of which...
A multiplexer and demultiplexer (MUX/DEMUX) based on 2-D photonic crystals (PhCs) for a dense wavelength division multiplexing (DWDM) system is presented. The designed MUX/DEMUX consists of narrow bandpass filters and magneto-optical circulators based on 2-D PhCs with triangular lattice of air holes, the parameters of which are analyzed by a finite element method. The simulation results show that...
Terahertz (THz) communication has important applications in high-speed and ultra-broadband wireless access networks. THz filter is one of the key device of WDM communications. THz filter based on ring cavity photonic crystal (TFRCPC) has many advantages such as simple structure, high integration and high flexibility. According to the coupling characteristics of waveguide and ring cavity, a novel structure...
A novel hybrid lattice photonic crystal fiber (PCF) with high birefringence is proposed, which is composed of circular and rectangular air holes. Based on the finite element method, the mode field distribution and birefringence properties of the hybrid lattice PCF can be numerically analyzed by COMSOL software. The influence of the geometric parameters on the birefringence and beat-length characteristics...
Inverted index is a key component in a search engine. Due to the high update frequency of web pages, incremental inverted index is commonly used in modern web-based search engine. In order to improve the performance of search engine, an efficient data block and control block DB&CB structure for incremental inverted index is proposed. Theoretical analysis and experiment results show that the average...
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