Method and device for manufacturing fiber bragg grating (FBG) with random reflection wavelength overlength

Abstract

The invention discloses a method and a device for manufacturing fiber bragg gratings (FBG) with a random reflection wavelength overlength. The method includes: using two bundles of holographic interference lasers to be incident into light fibers at a certain included angle from one side of the light fibers to generate holographic interference; and meanwhile, through an electronic control translation platform controlled by a computer, enabling the two bundles of holographic interference lasers to translate along the length direction of the light fibers, and through a computer-controlled electronic control rotating platform or a computer-controlled electronic control plane mirror frame, adjusting the included angle of the two bundles of holographic interference lasers. Writing of the FBG with random reflection wavelength overlength can be achieved, and the FBGs include narrow reflector tape gratings, chirp gratings, apodization gratings and the like.

Description

technical field [0001] The invention belongs to the field of optoelectronic technology and optical fiber communication technology, and specifically relates to a method and a device for manufacturing an optical fiber grating, in particular to a general method and device for manufacturing an ultra-long optical fiber grating with any reflection wavelength. Background technique [0002] As early as 1978, K.O.Hill et al. used the standing wave method to write fiber Bragg gratings successfully in Ge-doped silica fiber for the first time, which aroused great interest of researchers in the fabrication and application of fiber gratings. So far, fiber gratings have been widely used in the fields of optical fiber sensing, optical fiber communication and fiber laser due to their small size, light weight, high sensitivity, anti-electromagnetic interference and many other advantages. The grating obtained by the standing wave method can only work near the laser wavelength for making the gr...

AI Technical Summary

Problems solved by technology

Although this method is highly flexible and can form gratings, chirped gratings, phase-shifting gratings, etc. for each reflection wavelength by precisely controlling the distance that the optical fiber moves, there are many practical limitations.

First, the production of point-by-point gratings is time-consuming and can only be used to make short gratings; second, the precise movement control of optical fibers is very demanding, and the cumulative effect of movement errors makes it difficult to make longer gratings; 3. Since it is technically difficult to achieve focusing the light spot into a light spot within the grating period, it is difficult to make a fiber grating with a reflection wavelength of less than 1 micron

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