C_(6v)对称TIR-PCF结构参数对基模零色散点的调节数值研究

Zero Dispersion Point Adjusted by Structural Parameters of TIR-PCF with Six-fold Rotation Symmetry(C_(6v))

用多极方法数值研究构成六重对称全内反射型光子晶体光纤各种结构参数对基模零色散点的调节.数值结果表明,在相对孔径较大时,包层空气孔柱层数不影响零色散点,在其它结构参数相同的条件下,空气孔直径越大,零色散点波长越短,而在其它结构参数相同的条件下,空气孔孔距越大,零色散点波长越长,当空气孔直径与空气孔孔距都很小时,零色散点出现在长波区域,当空气孔直径与空气孔孔距大到一定程度时,色散曲线在零色散线出现振荡特性,并出现多个零色散点,在包层空气柱层数一定的条件下,中央纤芯缺省空气孔层数对零色散点的调节范围大.

Zero dispersion point adjusted by structural parameters of TIR - PCF with six - fold rotation symmetry is studied numerically with a multipole method. It is indicated that the zero dispersion point is hardly influence.d by the number of air holes in cladding with large relative apertures. The wavelength of the zero dispersion point becomes shorter with larger size of air holes and longer with larger distance between air holes. As size and distance are small, zero dispersion point appears in a long wavelength region. As size and distance are large enough, the dispersion curve oscillates near the zero dispersion point and several zero dispersion points appear. With constant number of air holes in cladding, the adjustment for zero dispersion point by the number of absent air hole in center core is large.