The Theoretical Design Of High Birefringent Photonic Crystal Fiber

In recent years, with the came out of photonic crystal fiber, a new class of opticalfiber which is totally different with traditional fiber was created. Because of highlyadjustable structure design, photonic crystal fiber has incomparable advantage of therealization of such as birefringence, dispersion flat, the dispersion compensation zerodispersion point can be adjusted, high non-linear and other optical properties, which madeit become a hot research field.First, the paper mainly introduces the theoretical basis of the finite element method.And how to use the theoretical basis of the vector finite element method simulated thecharacteristics of mode field distribution, birefringence, dispersion, confine loss, effectivemode field area and non-linear wash gargle.Secondly, with the aid of putting an asymmetric structure into the core of photoniccrystal fibers to realize highly birefringence, in fiber core added two elliptic air holesstructure, through adjusting the size of air holes, structure and other parameters to realizethe different duty ratio, equivalent refractive index, which was used to study influences onmode field distribution and birefringence.And then, adding high refractive index elliptic cylinders into the core to increase thecore refractive index. The paper studies the characteristics of birefringence and mode fieldwith highly birefringence photonic crystal fibers by changing size, refractive indexparameters. The results showed that photonic crystal fiber birefringence raise.Finally, the paper studies the characteristic of the new structure photonic crystal fiber,which was introduced a row high refractive index cylinder in photonic crystal array.Research found that it is possible that photonic crystal fiber with a hybrid light-guidingmechanism which orthogonal directions are respectively refractive index guide effect andband gap effect realize high birefringence. And also found its unique zero-dispersionwavelength adjustability. All of this has put forward a new train which can be used in thedesign of highly birefringence photonic crystal fibers.