Cch t Bragg si quang

Thng tin quang

ti: Cch t Bragg si quang (FBG).GVHD: Th.s V Ngc Chm.

Nhm 6:Nguyn Khc Lun.Ng Vit Dng.Khc Tun Anh.Nguyn Qu Thng.Bi nh Hng. Cch t Bragg si quang Cu to. Nguyn l hot ng. ng dng. Cch ch to. Kt lun.

Cu to

Ken Hill (1978), Gerald Meltz (1989)Cch t Bragg (FBG) quang thc cht l s xo trn cu trc ch s chit sut theo dng chu k dc theo hng truyn sng ca si quang.Mt s cu trc ph bin: Cu to

Nguyn l hot ng

S thay i tun hon ca ch s khc x.Sng n c phn x t mi chu k cch t.Cc s phn x ny c cng pha khi chiu di ng i ca sng B mi chu k bng mt na bc sng n B in kin Bragg.iu kin Bragg: B = 2.neff.B : l bc sng Bragg phn x.neff : l ch s khc x nh hng. : l chu k cch t.

Nguyn l hot ng Nguyn l hot ngBng thng ca sng phn x:

no : s thay i chit sut khc x. : phn nh nng lng trong li.B : l bc sng phn x.

Nguyn l hot ng ng dngMt s u im chnh ca FBG:FBG thuc loi b lc phn x (tch vi chnh xc cao +-0,05nm).n nh trong qu trnh s dng v c hiu sut cao (phn x gn nh 100% as ti).C kch thc nh, d s dng v g b khi cn thit.Khng chu nh hng ca nhiu in t trng.D thch hp trong cc si quang d s dng trong mng vin thng.D ch to v gi thnh khng cao.

ng dngng dng trong cc h thng cm bin:Cm bin nhit , sc cng, p sut.ng dng trong laser quang:Laser cch t quang bn dn.Khuych i kch thch Erbium cho laser.ng dng trong truyn dn quang:B tn sc.Cc h thng ghp knh phn chia theo bc sng WDM.B lc cn bng cho khuych i Erbium.B phn x nhiu.Khuych i Raman.

B tn sc:

ng dngB tn sc: ng dng

ng dng ca FBG trong b tch ghp knh OADM. ng dng

ng dng trong cc h thng cm bin

ng dngChiu chm UV c bc sng 248nm vo si quang c li l SiO2 pha tp GeO2 l vt liu nhy quang (14% n 20%) nu pha tp thp s khng to c FBG.

Chiu x tia cc tm im-im.Phng php mt l bin tia UV.Phng php ch to FBG qua mt n pha( Phase Mask).Phng php ch to FBG bng h giao thoa k. Cch ch toChiu x tia cc tm im-im.

Cch ch to

Phng php mt l bin tia UV.

Cch ch to

Phng php ch to FBG qua mt n pha( Phase Mask).

Cch ch to

Phng php ch to FBG bng h giao thoa k.

Cch ch to

Nm bt c tng quan v cc tnh cht quang ca cch t Bragg trong si (FBG).Tm hiu ch to FBG bng nhiu phng php s dng chm UV.Mt s ng dng quan trng ca FBG.

Trong tng lai, cch t Bragg si quang (FBG) s cn c nhiu ng dng quan trng cn c nghin cu s dng ht tim nng.

Kt lunTHE END