Photonic Crystal Waveguide Power Splitter With A Ring Resonator Add-drop Filter

In this dissertation, We have investigated the propagation efficiency of TM wave in the photonic crystal waveguide,photonic crystal power splitter,photonic crystal add-drop filter which are designed in the square lattice photonic crystal structure by using finite-difference time-domain method. Compared with the normal L-shape photonic crystal waveguides and the normal T-shaped 1×2 photonic crystal power splitters, the L-shape photonic crystal waveguides based on photonic crystal ring resonators (PPRRs)and the 1×2 and1×4 photonic crystal power splitters based on PPRRs have more stable performances,and they have characteristics of low loss,compact sizes and so on, and have high transmission efficiency and perfect power splitting performance in the third communication window(1550nm wavelength). The structures of 1×2 and 1×3 add-drop filter have a better drop efficiency in single modes optical fibers'S waveband (1450~1520nm),or C waveband (1530~1565nm),or L waveband (1570~1620nm), and the signals which are dropped by the structures can be propagated along four directions, upward, downward, forward, backward, and they are important parts of optical add-drop multiplexers,photonic integrated circuits,optical switches etc.