Temp. compensated long period optical fiber grating filter

A technology of long-period gratings and optical fiber gratings, which is applied to clad optical fibers, diffraction gratings, optical waveguides, and light guides, and can solve the problems of undisclosed coating of the outer layer of optical fibers

Inactive Publication Date: 2002-04-03
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, patent 5,757,540 to Judkins et al. does not disclose coatin...

Method used

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  • Temp. compensated long period optical fiber grating filter
  • Temp. compensated long period optical fiber grating filter
  • Temp. compensated long period optical fiber grating filter

Examples

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Embodiment Construction

[0024] Figure 1A is a cross-sectional view showing a long period fiber grating filter. Such as Figure 1A As shown, the LPFG filter includes a core 102 forming an LPFG 100 , an outer layer 104 surrounding the core 102 along the LPFG 100 , and a coating surrounding the outer layer 104 .

[0025] The long-period grating 100 is formed by partially removing the coating 106 of an optical fiber sensitive to ultraviolet light, and then irradiating ultraviolet laser light onto the optical fiber while utilizing an amplitude mask (amplitudemask) (not shown) adapted to transmit the ultraviolet laser light at certain periodic intervals. out), so that a periodic refractive index change occurs within the core 102.

[0026] Figure 1B shown in Figure 1A The operation of coupling the core mode to the outer layer mode in the long-period fiber grating filter of . A fundamental guided mode 110 propagating within the core 102 is scattered while passing through the refractive index change regi...

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PUM

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Abstract

Disclosed is a temperature compensated long period optical fiber grating filter. The long period optical fiber grating filter includes a core formed with a long period grating, a cladding surrounding the core, a coating coated over a portion of the cladding not surrounding the long period grating, and a re-coating coated over a portion of the cladding surrounding the long period and made of a material exhibiting an increase in refractive index in accordance with an increase in temperature, the recoating serving to allow a coupling wavelength shift caused by the increase in refractive index to be carried out in a direction opposite to that of a coupling wavelength shift caused by a refractive index difference between the core and the cladding. In accordance with this long period optical fiber grating filter, a temperature compensation can be more easily achieved without any inconvenience caused by an adjustment of refractive index in the filter or an addition of a material for avoiding a variation in refractive index depending on temperature.

Description

[0001] FIELD OF THE INVENTION The present invention relates to a temperature compensated long period fiber grating filter. Background technique [0002] In general, a long period optical fiber grating is a device for coupling a mode propagating in the core of an optical fiber with a mode propagating in the outer layer of the fiber. This long-period fiber grating filter has an advantage in gain flatness of an erbium-doped fiber amplifier (EDFA) in that it is a mode coupling type different from a reflection mode coupling type. Such long-period fiber gratings are fabricated to exhibit periodic variations in the refractive index of their core. This periodic variation of the refractive index is obtained by periodically exposing the fiber core in the fiber grating to ultraviolet light during the manufacture of the fiber grating, wherein the fiber is sensitive to ultraviolet light. That is, an increase in refractive index is exhibited at the core porti...

Claims

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Application Information

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IPC IPC(8): G02B5/18G02B6/00G02B6/02G02B6/14G02B6/34
CPCG02B6/0219G02B6/02095G02B6/00
Inventor 章絑宁
Owner SAMSUNG ELECTRONICS CO LTD
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