3.1折射率导模型光子晶体保偏光纤等效椭圆芯光子晶体保偏光纤椭圆孔光子晶体保偏光纤空气孔大小不一致的光子晶体保偏光纤双折射可调的非对称大气孔光子晶体保偏光纤椭圆孔正方形或矩形点阵的光子晶体保偏光纤正交方向气孔间距不一致的光子晶体保偏光纤3.2光子带隙型光子晶体保偏光纤空芯光子带隙型保偏光纤（HC-PBG-PM-PCF）基于高双折射光子晶体保偏光纤的许多优点,在未来的相干光通信系统、新型超宽激光偏振光源、新型光纤器件,例如光纤传感器、光纤偏振器、光波分复用器、光调制器和水听器等相干检测器以及光纤陀螺方面将发挥很大的作用。部分PMPCF英文文献参考资料A. Ortigosa-Blanch, J. C. Knight, W. J. Wadsworth, J. Arriaga, B. J. Mangan, T. A. Birks, and P. S. J.Russell, Highly birefringent photonic crystal fibers, Opt. Lett. 25, 1325-1327 (2000).K. Suzuki, H. Kubota, S. Kawanishi, M. Tanaka, and M. Fujita, Optical properties of a low-losspolarization-maintaining photonic crystal fiber, Opt. Express 9, 676-680 (2001),http:/www.opticsinfobase.org/oe/abstract.cfm?URI=oe-9-13-676.T. P. Hansen, J. Broeng, S. E. B. Libori, E. Knudsen, A. Bjarklev, J. R. Jensen, and H. Simonsen, Highlybirefringent index-guiding photonic crystal fibers, IEEE Photon. Technol. Lett. 13, 588-590 (2001).J. R. Folkenberg, M. D. Nielsen, N. A. Mortensen, C. Jakobsen and H. R. Simonsen, Polarizationmaintaining large mode area photonic crystal fiber, Opt. Express 12, 956-960 (2004).A. Ortigosa-Blanch, A. Diez, M. Delgado-Pinar, J. L. Cruz, and M. V. Andres, Ultrahigh birefringentnonlinear microstructured fiber, IEEE Photon. Technol. Lett. 16, 1667-1669 (2004).W. Belardi, G. Bouwmans, L. Provino, and M. Douay, “Form-induced birefringence in elliptical hollowphotonic crystal fiber with large mode area,” IEEE J. Quantum Electron. 41, 1558-1564 (2005).J. R. Folkenberg, M. D. Nielsen and C. Jakobsen, Broadband single-polarization photonic crystal fiber,