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thong tin quang
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I HC QUC GIA TP.HCM
TRNG I HC BCH KHOA
Khoa in in t
..0O0..
Mn: THNG TIN SI QUANG
Bi tp: 1, 2 v 3
Ging vin: TS. Phm Quang Thi
Nhm: Nguyn Xu Lin v L Quang Tn
Lp: Cao hc Vin thng 2013
TP. H Ch Minh, 10 - 2014
Bi tp 1: LED system, change bit rate from 100 Mbps to 300 Mbps. Maximum allowed BER 10-9. Find the
maximum bit rate.
S mch:
- Bit rate at 100 Mbps:
- Bit rate at 140.49Mbps:
- Bit rate at 300 Mbps:
Kt lun: Sau khi thay i tc bit vi cc gi tr khc nhau nm trong khong t 100 Mbps n 300
Mbps, kt qu t c l khi truyn vi t l bit l 140.49 Mbps cho tc li bit (BER) gn thp nht
l 0.999857 x 10-9 sp x vi BER cho php ti a l 1 x 10-9. Ngoi ra cng cho thy rng khi truyn tc
bit cng cao th BER cng tng.
Bi tp 2: LD system, change bit rate from 1 Gbps to 20 Gbps. Maximum allowed BER 10-9. Find the
maximum bit rate.
S mch:
- Bit rate at 1Gps:
- Bit rate at 5.753Gbps
- Bit rate at 20 Gbps:
Kt lun: Sau khi thay i tc bit vi cc gi tr khc nhau nm trong khong t 1 Gbps n 20 Gbps,
kt qu t c l khi truyn vi tc bit l 5.753Gbps cho t l li bit (BER) gn thp nht l
0.996257 x 10-9 sp x vi BER cho php ti a l 1 x 10-9. Ngoi ra cng cho thy rng khi truyn tc
bit cng cao th BER cng tng.
Bi tp 3: For the LD system. Set:
- Bit rate: 1Gbps - Bit sequence length: 16 bit - Laser bias current to 20 mA
Obeserve the received signal. Explain the results.
S mch:
Kt qu m phng:
Nhn xt: khi cho di chui bit l 16 bit/s, ph tn hiu dnh chm nhau, t l li bit t cao nht.
Nhn xt: khi dng bias (20mA) thp hn dng ngng 33.457 mA, Laser khng pht sng. Tn hiu pha
thu hu nh l khng c tn hiu. Ph tn hiu b ko dn ra.