To realize wavelength division multiplexing for high-capacity optical communications, we theoretically investigate the properties of a photonic crystal waveguide structure in which a row of air holes is displaced by a/2 (a is the lattice constant). We calculate transmission loss and coupling efficiency to circular defect cavities of this waveguide structure, which we call an orthogonal lattice waveguide (OLW). The communication bandwidth of the OLW is estimated to be about 20 nm, which is twice that of the conventional line-defect (W1) waveguide. This result indicates that improvements in characteristics of the wavelength division multiplexing are expected by using the OLW instead of W1.

为了实现用于大容量光通信的波分复用，我们在理论上研究了其中一排气孔错开a / 2（a是晶格常数）的光子晶体波导结构的特性。我们计算该波导结构的圆形缺陷腔的传输损耗和耦合效率，我们将其称为正交晶格波导（OLW）。OLW的通信带宽估计约为20 nm，是常规线缺陷（W1）波导的两倍。该结果表明，期望通过使用OLW代替W1来改善波分复用的特性。