thiet bi phat quang
TRANSCRIPT
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8/7/2019 thiet bi phat quang
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B GIO DC V O TOTRNG CAO NG CNG NGH THNH
KHOA IN T-VIN THNG= = = = o0o = = = =
H THNG THNG TIN QUANG
TI: B PHT QUANG
BI TP LN
Gio vin hng dn: L Vn ThnSinh vin thc hin: Nguyn Vn Cng
Nguyn Th Lan
V Linh QuyLp : C in T 1_K3
H Ni 10 - 2008
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Ngun Pht quangNgun Pht quangCC VNG NNG LNG
Qu trnh c bn xy ra gia trng thi nng lng nguyn t
a, Hp Th b, Bc x t pht c, Bc x kch thch
hv
hv
hv
hv
E1 v E2: trng thi t v trng thi kch thch ca ccnguyn t ca mi trng hp th . nh sng ti c tn sv,nng lng photon hv
Nguyn t c kch thch quay v trng thi t v pht ranh sng. Thng qua 2 qu trnh l bc x t pht v bc xkch thch
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Ngun pht quangNgun pht quangTip gip P-N:Hnh thnh t 2 loi bn dn loi n v bn dn loi p:Khi cha t in p phn cc => Cc ht ti asKhuych tn qua lp tip gip => Hnh thnhhng ro thTrng thi cn bng thit lp => Vng ngho(khng c ht ti linh ng)
Vng ngho
P
P
NN
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Ngun pht quangNgun pht quangTip gip P-N: Phn cc ng-c: Vng ngho m rng ra, cc in t
v cc l trng kh gp nhau ti hp pht ra nh
sng.S dng trong photodiode.
Dng ht mang thiu s Bng ho tr
Truyn dn
Pha n Pha p
Vng ngho m rng
Ngun ngoi
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Ngun pht quangNgun pht quangTip gip P-N:
Phn cc thun: Vng ngho hp li hay hng ro ththp xung cc in t v cc l trng -c bm vovng ngho d dng ti hp pht ra nh sng.
Quan h gia dng chy qua tip gip v th t vo
Vng ngho hp li
Ngun ngoi
Pha pPha n
P N
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Ngun pht quangNgun pht quangTip gip P-N:
Cu trc ng th: cc ht ti khng b giam hm hiu sutpht x km.
Cu trc d th kp: gm 3 lpc bn
Lp bn dn mng gia c Eg nh(lp tch cc)
Hai lp bn dn p v n hai bn c Egln hn (cc lp hn ch)
u im:- Giam hm ht ti
- Giam hm photon
Loi n Loi p
bng
truyn dn
bngho tr
Mtnghing
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Ngun pht quangNgun pht quangCu trc LED:
Cu trc d th kp
Da trn c ch pht x tpht
nh sng pht ra l nh sngkhng kt hp c rngph ln (30 - 60 nm)
rng chm sng pht xln Hiu sut ghp nh
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Ngun pht quangNgun pht quangCu trc LED:LED pht mt:
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Ngun pht quangNgun pht quangCu trc LED:LED pht cnh:
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8/7/2019 thiet bi phat quang
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Ngun pht quangNgun pht quangCu trc LED:
p ng ca LED:
-ng c tnh P-I t l theo I
bo ho dng bm cao.
Nhit tng p nggim.
c tnh P-I ca LED:
Dng iu khin(mA)Dng iu khin(mA)
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Ngun pht quangNgun pht quangCu trc LED:
c tnh ph ca LED:Ph ca LED lin quan n ph pht x t pht.
rngph:
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Ngun pht quangNgun pht quangCu trc LASER:Laser: B cng h-ng trong mt mi tr-ng tch cc(khuych i)
Laser bn dn hay LD: cu trc d th kp
Di thanh ngang
Li bn
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Ngun pht quangNgun pht quangCu trc LASER:Qu trnh hi tip quang: thc hin trong mt hp cngh-ng hnh thnh bi 2 g-ng phn x.
phn x:
Ng-ng laser: cc photon sinh rat pht x kch thch b xung cho
cc photon b mt i do suy hao
khuych i quang phi ln
b suy hao hp cng h-ng Hot
ng laser ch xy ra khi dng
bm > dng ng-ng. Tng trung bnh
Gng
Mt tch
Phng x
Phun dng
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Ngun pht quangNgun pht quangCu trc LASER:
. Giam hm dng bm: Dng bm ch chy qua vngtch cc.
. Mt s ph-ng php -c s dng:
- in cc di hp
- Tng in tr sut bng bn ph proton
- To ro cn bng mt lp tip gip p-n phn cc ng-c
- Knh dn bng khuych tn cht pha tp
- iu bin dy lp bn dn
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Ngun pht quangNgun pht quangCu trc LASER:
Mt s v d c th:
Cu trc LD dn sng khuych i:
a,di oxide
b,di tip gip
Cht in mi Khuych tn nh sng
C
ht nnC
ht nn
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Ngun pht quangNgun pht quangCu trc LASER:
Cu trc LD dn sng chit sut
a,dn sng chit sut yu
b,dn sng chit sut mnh
Tip xc Tip xc
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Ngun pht quangNgun pht quangCu trc LASER:Laser phn b hi tip (DFB): Qu trnh hi tip -cthc hin bi nhiu x Bragg ghp cp cc sng lantruyn theo chiu thun ng-c.
Ghp cp ch xy ra i vi mode tho mn iu kinBragg:
Li st
Phng x
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Ngun pht quangNgun pht quangCu trc LASER:c tnh P-I
nh h-ng ca nhit :
cng sut pht x theo nhit:
Dng iu khin(mA)
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THE END !