BAI Ning-feng, SUN Xiao-han. Optimum Design on Compact Photonic Crystal Waveguide Directional Coupler Based on Adiabatic Coupling[J]. Acta Electronica Sinica, 2007, 35(2): 220-223.
BAI Ning-feng, SUN Xiao-han. Optimum Design on Compact Photonic Crystal Waveguide Directional Coupler Based on Adiabatic Coupling[J]. Acta Electronica Sinica, 2007, 35(2): 220-223.DOI:
We present an optimal design of Photonic Crystal Waveguide Directional Coupler (PCW-DC) with adiabatic coupling boundary in this paper.The Planar Wave Expand method (PWE) is employed to analyze the band gap and the proprieties of defect mode in parallel PCW.A 90° bend PCW is designed to couple the PCW-DC and two parallel single mode fibers which connect to PCW-DC at port one and port two
respectively.The transmission proprieties of the PCW-DC with adiabatic coupling boundary are analyzed with finite-difference time-domain (FDTD) method.It is shown that use this PCW-DC can achieve efficient transmission ratio in cross state
bar state and power division state at different coupling length.The simulation results show that the coupling ratio can be higher than 90% in a wide wavelength range when the PCW-DC is designed in bar and cross states.