Small diameter polarization maintaining photonic crystal fiber

Abstract

The invention provides a small diameter polarization maintaining photonic crystal fiber which comprises a quartz crystal substrate which is distributed with a plurality of air holes arranged according to a certain rule to form a fiber core and a cladding. The hole diameter size of the air holes is in a wavelength magnitude. The air holes are divided into large air holes and small air holes and are divided into three layers. The air holes of each layer is arranged to form a regular pentagon. The first layer comprises five air holes, each air hole occupies each one of five vertices of the pentagon, and the five air holes comprise three large air holes and two small air holes. The second layer is formed by ten small air holes, five air holes occupy five vertices of the pentagon respectively, and a middle point of each of five sides of the pentagon are provided with an air hole respectively. The third layer is formed by ten air holes, air holes at five vertices of the pentagon are missed, and fives sides are uniformly distributed with two small holes respectively. The small diameter polarization maintaining photonic crystal fiber is a polarization maintaining photonic crystal fiber with small diameter, high birefringence and simple preparation and is specially used for winding a fiber optic gyroscope sensitive ring.

Description

technical field [0001] The invention relates to a photonic crystal fiber, in particular to a small-diameter, polarization-maintaining photonic crystal fiber with good polarization-maintaining properties. Background technique [0002] Photonic crystal fiber is a new type of fiber developed on the basis of photonic bandgap theory. Due to the flexibility of structural design and unique optical characteristics, it has been widely concerned since it came out at the end of the last century. A typical photonic crystal fiber is composed of pure silica crystal and a certain number of air holes distributed in it. These air holes are distributed along the fiber axis and run through the whole fiber, so photonic crystal fiber is also called microstructure fiber or holey fiber. . The structure design of photonic crystal fiber is flexible. By adjusting the size of air holes in the cladding, the size of the hole gap, the size of the central entity, and the refractive index of the central e...

AI Technical Summary

Problems solved by technology

[0010] Although some photonic crystal fibers suitable for the sensitive ring of fiber optic gyroscopes have appeared on the market, these fibers are large in size and complicated to prepare, which cannot well meet the needs of the development trend of high precision and miniaturization of fiber optic gyroscopes.

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