Double-layer graphite rod tunable optical fibre raster form and its preparation

Abstract

This invention refers to a kind of adjustable fiber grating module, which can be used in optical fiber communication. The existing technology has very large limitation, with bad adjusting ability and bad period adjusting ability. Also the period uniformity is hard to realize. Then intention of the invention is to realize the period continuous, adjustable and homogeneous on the base of all the merits of the existing module (mainly about the character of the transferring spectral line). It is also intended to adjust flexibly the character of long period fiber and raster transferring spectral line. The new double-layer graphite rods can adjust the fiber grating module. It includes the smooth board, on which are arranged parallel double-layer graphite rods, the base on the bottom and the action layer on the top. This module has homogeneous period which can change its own number and is continuous. This invention costs little and has large source of material, so it is easy to realize industrial production and reconstruct. Besides, the quality comparing to the price is satisfying, and it has potential big value in the fields of gaining and smoothening of the erbium-doped optical fiber amplifier and the wave filter making.

Description

technical field [0001] The invention relates to a tunable optical fiber grating template, which is used in the fields of transmission filters, optical fiber grating sensors, mode converters and the like in optical fiber communication. Background technique [0002] At present, the templates used to make stress long-period fiber gratings (LPFG) at home and abroad mainly include the following: a. flat plates with parallel grooves (S.Savin, M.J.F.Digonnet, G.S.Kino and H.J.Shaw, Tunable mechanically induced long-period fiber gratings, Opt.Lett, 2000, 25(10), 710-711), or fluted cylinders (G.Rego, J.R.A Femandes, J.L.Santos, H.M.Salgado, P.V.S.Marques, New Technique to Mechanically Induce Long-Period Fiber Gratings, Optics Communications, 220(2003), 111-118); b. Monolayer tiled and densely packed graphite rod arrays (Ik-Bu Sohn, Jang-Gi Back, Nam-Kwon Lee, Hyung-Woo Kwaon and Jae- WonSong, Gain Flattened and Improved EDFA Using Microbending Long-Period Fiber Gratings, Electron.L...

AI Technical Summary

Problems solved by technology

[0003] Among them, method a has high requirements on the processing technology, it is difficult to achieve the uniformity of the cycle, and the cycle cannot be adjusted, the number of cycles cannot be adjusted flexibly, and the material cannot be reused.

Although method b can ensure the uniformity of the period, the period depends on the diameter of the graphite rod, so it is greatly limited, and the tuning of the shape of the LPFG resonance peak is poor

Although the periods of the latter two methods c and d are not limited by the diameters of graphite rods and metal wires, the uniformity of the period is difficult to achieve and the period adjustability is poor.

The uniformity of the method e cycle and the adjustability of the cycle are difficult to achieve

There are certain defects in these methods, and it is difficult to meet the practical requirements.

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