Abstract
We proposed a novel design of photonic crystal fiber with the characteristics of high birefringence and zero dispersion. The structure of the photonic crystal fiber is composed of the rectangular lattice with double-cladding and there is an elliptical air hole in the core of the photonic crystal fiber which has the same size with the holes of inner ring. Simulation results show that the elliptical air hole in the core can enhance the performance of mode birefringence and control the properties of chromatic dispersion at the same time. We obtain the high birefringence B = 2.1 × 10−3 and B = 2.9 × 10−3 at the wavelength of 1.31 and 1.55 μm respectively and the zero dispersion point at the wavelength of 1.31 μm. The proposed photonic crystal fiber with high birefringence and zero dispersion will be important in the applications of polarization maintaining transmission systems.
Highlights
Photonic crystal fibers (PCFs) present a wavelength-scale periodic microstructure running along their length
We proposed a novel design of photonic crystal fiber with the characteristics of high birefringence and zero dispersion
We have proposed a birefringent photonic crystal fiber with elliptical air holes with rectangular-lattice and analyzed the effects of structure parameters on the mode birefringence and the chromatic dispersion
Summary
Photonic crystal fibers (PCFs) present a wavelength-scale periodic microstructure running along their length. The theory of PCFs has developed in a variety of directions It has a number of novel features such as low optical losses, high optical nonlinearity, ultranegative dispersion and polarization effects compared with conventional optical fibers. Chen et al proposed a kind of rectangular lattice photonic crystal fiber with the circular air holes whose width and length ratio of the fiber are different They have achieved a high birefringence in order of 1.0 9 10-3 at the wavelength of 1.55 lm which is lower than ours (Chen and Yu 2006). The properties of birefringence and chromatic dispersion is investigated by numerical simulation This is novel idea that adding an air hole in the core in a double-cladding rectangular lattice PCF with elliptical air holes. This fiber will play a very important role in the fields of polarization maintaining transmission system and zero dispersion devices
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