Sinh vin thc hin: Nguyn Trung Dng MSSV: 20101286 T-VT 06 K55
M lp th nghim: 630713 Tun: 8, 13
H Ni, 11/2014
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Kt qu thc hnh
I. Tm hiu phn mm, v s h thng
1. Cha b tn sc
Hnh 1. S h thng WDM khi cha c si b tn sc DCF
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K t qu m ph ng Power1 = 0 dBm. BER analyzer
Trn Oscilloscope: Knh 1
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Trn Oscilloscope: Knh 1
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3. K thut b sau
Hnh 3. S h thng WDM khi c si b tn sc DCF (k thut b sau)
K t qu m ph ng Power1 = 0 dBm. BER analyzer
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Trn Oscilloscope: Knh 1
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II. Nhn xt
Cc phng php b tn sc chnh: B trc. B sau. B cch t Bragg. S dng b
lc quang.
Khi cha b tn sc th t l li bt rt ln n 1 khi truyn trn ng truyn
di, n chth truyn trn qung ng khng qu 50-60 km do s suy hao v tn
sc.
khc phc iu ta dng mt trong cc phng php tn b tn sc, ta d thy
rngtrm lp c mt trm khuch i v b tn sc nn t l li bt BER cng gim xung
ngiu ny cng ph thuc vo cng sut ca tn hiu pht. Cng sut pht cng ln th
t l l
cng nh, tuy nhin chng ta thng iu chnh chn c cng sut hp l c t l
li bit t yu cu (thng l 10-12).
