Điều chế ttl và ứng dụng trong thông tin quang

BAO CAO TOM TAT D E TAI N C K H CAP DHQG 1-Ten de tai; Dieu che TTL va ung dung thong tin quang Mas6QT-99-05 2- Chu tri de tai: PGS.TS Vu nhu Cuong 3- Cac can bp phoi hap Thac Sy Truofng vu B^ng Giang C\x nhan Chir diic Trinh - NCV Pham thi Tuyet - Mot so sinh vien khoa CN DT-VT 4- Tom tat ket qua nghien curu Tim hieu ve dudng truyen thong tin quang Tim hieu ve dieu che TTL, ling dung phat va thu tin hieu quang da du'Oc dieu che hkng phuong phap dieu che noi Che tao bo phat va thu tin hieu quang 5- Cac ket qua dat dupe Tong quan thong tin quang- Giao trinh TTQ - Thiet ke lap rap mot so phan tii cho he thong truyen dSn tin hieu thong tin quang Xay dung cac bai thuc tap TTQ ve cac van d6 tren Dao tao cii nhan CN DT-VT ve thong tin quang hoc 6- Tinh hinh kinh phi de tai Da dupe chi dung nhu du toan Ha ngi 20 thdng nam 2003 Chii tri de tai PGS.TS Vu nhu Cuong Xac nhan ciia co quan chii irVjk^ 'i ! / LJ '^\ "> GS.ISKH: t^/%^4i€^€^t ^iyncl ^^nwf truan Xac nhan ciia hoa hoc tu nhien ^^ Mu.Suu'^S.MAW O A l H O C O i / ' • • ^ t A HA N O i TRUNG TAM ' ONG TIN THU ViEN \^ ^~'- BAO CAO TONG KET DE TAI CAP DAI HOC QUOC GIA ''Dieu che TTL vd ung dung Thong tin quang K' Giai thieu ve de tai I- Ten de tai: "Dieu che TTL va img dung Thong tin quang" Ma so QT 99-05 II- Chu tri de tai: POSTS Vu nhu Cuang Luc luong tham gia d6 tai: Cac can bo phoi hop - Thac Sy Truong vu Bang Giang Cu nhan Chu due Trinh - NCV Pham thi Tuyet - Mot so sinh vien khoa CN DT-VT III- Thai gian thuc hien: 24 thang 1999-2000 I V - Xuat xii ciia de tai Do nhu cau thong tin doi hoi truyen dung luong cang 16n, toe truyen eang nhanh den muc eae he thong truyen din truyen thong : eap doi xiing , eap dong true, song vi ba, thong tin ve tinh kh6ng the dap ling duae Dam duong nhiem vu ehi eo the la he thong thong tin quang hoc vai song mang tan so Idn 10^-10^ Hz va toe eao c6 the nang dan len tir Mbit/s-Gbit/s va den Tbit/s.Cho den thong tin quang da trai qua bon the he The he thii tu dang duoc thuong mai hoa, duoc dac trung bing cong nghe ghep kenh quang DWDM eo su dung khuyech dai quang sgi pha tap Erbium Toe truyen din eo the dat tai hang tram Gbit/s The he thii nam dang thu nghiem vdi day hua hen The he la the he giai quyet van de tan sic ciia sai quang duae dae trung bing cong nghe truyen din Soliton Co the noi he thong TTQ CO nhung uu viet khong the thay the v6 toe truy6n din, vt dung luong eung nhu chat luong thong tin Thong tin quang nhap vao Viet nam vao dau nhung nam 90 cua the ky 20 Nam 1991 Bo mon Quang va Quang khoa Vat Ly truang DHTH cu la truang DHKHTN bat dau nghien euu ma ehuyen de TTQ.' Nam 1996 Khoa CNDT - VT truang DHKHTN dai , tiep tue nghien euu dao tao cac cir nhan DT - VT \'ai cac khoa luan ve TTQ, xay dung cac thi nghiem, thuc hanh ve TTQ cho SV va hoc vien eao hoc Viee nim bit cong nghe mai, dao tao cac ehuyen gia ve llnh vue la mot doi hoi cap thiet Do chinh la ly hinh rhanh de tai vao nam 1998 V- Muc tieu ciia de tai bao gom: Tim hieu viee ung dung dieu che TTL TTQ vi he thong truyen din TTQ la he truyen din so 2 Thifi't ke lip rap cac mach thu phat tin hieu quang dieu che TTL Xay dung mot so bai thuc tap vi TTQ Dao tao cac cu nhSn DT-VT lam khoa luan ve TTQ B Cac Mt qua daf dirge 1- T6ng quan th6ng tin quang- Giao trinh TTQ Phu luc 2- Thifi't ke lip rap mot so phin tu cho ht ihong truyen din tin hieu th6ng tin quang, Va xSy dung cac bai thuc tap TTQ ve cac van de trSn Phu luc He th6'ng thong tin sgi quang TTL/EFO la mot cong cu tuyet hao de de phat tin hieu so TTL dieu che cuong anh sang phai tu nguong quang( la died phat quang LED hoac diod laser LD ) Sa 66 khoi cua he thong phat va thu tin hieu TTL dugc m6 ta or hinh sau Hinh Sa 66 khoi cua he thong thu phat so quang TTL lOMbit/s Nguon quang dugc gin vao diu noi FC de ghep noi vai sgi quang Ve phia diu thu sgi quang dugc noi vai dau quang thong qua diu n6i FC Diu quang chira m6t Ph6 to di 6t PIN ( hoac APD ) Dong dien cua diu quang dugc khuye'ch dai bing mot bg khuyecli dai ehuyen ticp cung cap m6t dien ap a loi Sau la m6t b6 khuye'ch dai dai rgng va mot mach nguon TTL tuang thich Di thuc hidn kiem tra tren cac mach, khoi mach ehira eon chtJa mot may phat xungthay doi duae tin s6 Hinh HelhuctapTTQl oc uo OMbit/s SV Q C5 iOOOuF R9 Ik RIO C4 T -±r T hi P.7 -±r UlA 150 TPl Rb £20 R8 Ik • • ^ U2B T ^ > •^ne UiC r T U6 UIB 100 " I " lOO R4 lOuF CI us 74HC1'1 (U2A,U2B RZ ^ U2A 100 -N b^ 74HCO0 R3 10 Cuii^uiB.tric; Hinh Sado nguyen ly may phat xung quang 10Mbps L May phat: So 66 nguyen ly cua may phat xung quang duoc trinh bay tren hinh May phat (transmitter) bao gom may phat xung TIL va bo dit^u che dong bom cho laser diode a May phat xung TTL tan so bien doi: May phat xung TTL (TTL Generator) tan so bien doi c6 dai tan so c6 the thay d6i tir 500kHz den 5MHz hoac tu IMHz den lOMHz Trong ca dai tan so, ti Ic giua d6 rong va r5ng xung ia 1:1 va khong thay d6i vdi bien 5V May phat xung dira tren ca so* vi mach 74HC14 May phat xung eo nhiem vu tao tin hieu so mSu cho qua trinh truyen din qua cap sgfi quang, truang hgp c6 tin hieu thong tin so thuc cau noi (jumper) U4-U6 dugc tach va tin hieu thong tin dugc dua thang vao bo dieu che laser vh dugc kiem tra tai didm TPl I-Rnh cho thay dang tin hieu loi ciia may phat xung TTL (a) va dang tin hieu thu dugc sau qua he truyen dfm quang (b) tai toe 5Mbps (tin hieu dugc qua day suy hao 10 Ian) b Bo dieu che dong bom cho laser diode: Bp dieu che dong bo'ni olio laser diode sir dung vi mach 74HC00 cung cap dong bam cho laser diode LD gom dong tin hieu ac tren nen mot chicu dc c6 the thay doi bien bing bien tra R2 • Dong bam cho laser diode dugc kiem ua tai diem TF^2 th6n« qua sut the tren dien tra tai laser R^ (10 Q) Hinh lh6 hicn ii'n hieu bom vao laser gom dong dc va ac Laser diode a day la module laser don mot phat a buoc song 1310nm c6 ddu noi connector FC Module phat dugc noi vdi module thu photodiodc c6 dau noi connector FC thong qua adaptor quang va day nhay sgi quang (Fiber) May rhu : Sa nguyen ly cua may thu (Receiver) xung quang trinh buy tren hinh Module tliu su dung a day c6 tien khuech dai ehuyen tra khang gdn ben (in-situ) boat dong vdi bang thong tdi da 150MHz, nhay thu -37dBm Tin hieu tliu Hinh 4: Tin hieu loi ciia may phat xung TTL (a) va tin hieu thu dugc sau qua he truyen ddn quang (b) vdi toe 5Mbps Hinh 5: Tin hieu bo"m vao laser: I^^=40mA, I,,-20mA , ' dugc tu PIN photodiode sau qua bo tien khuech dai (c6 the kiem ira lai diem 'IIM ) di vao mach sua dang xung tren ca sd IC MC 10116 Dang tin hieu bi meo tren dirdng truyen dugc phue hoi dan sau di qua cac tiing ciia IC sua dang Tin hieu c6 the kiem ira d diem kiem tra TP4 Sau do, tin hieu dugc di qua phan khuech dai cong suat (buffer) tren ca sd transistor 2N2905 va cudi cluing duae sua dang lai Ian nun bdi IC 74HC14 Cac tfn hieu TTL loi cd pha trung va ngugc pha vdi tin hieu loi vao dugc dua qua cong PI va P2 Hinh bieu dien cac tin hieu loi d tdc 10Mbps • V SV ioo s ;oo X T?6 - v ^ ^ V ni 41) Qr 'J^ P.? 56 Lk f i/3:ci 1/3IC1 H> ^ n t H I ? > IL' izo ^ i i?o -j'"' IPS 1/3IC1 ICl 01, 02: 2^1905 Hinh 6: Sa nguyen ly cua may thu xung quang Z)l 1-iH-Zi-i T Nlid CO b6 tien khuech dai nhay eao va khuech dai 16*n cung nhu cac bg phan sira dang tin hieu dan dfin nen t^n sd tin hieu Idi vao may phat cd the thay doi mdt dai rdng (500kHz -^ 5MHz) ma ti le rgng va rdng xung viln dugc dam bao a loi may thu Hinh la dang tin hieu TIL d dau may phat xung va tin hieu thu dugc d dau cua may thu quang vdi tan sd 500kHz He thdng thu phat quang cung cd the hoat dong d tiin sd thap ( dai KHz) Hinh 7: Tin hieu d hai loi ciia may thu 4dc 10Mbps .Vlay cong suat quang: May cong suat quang loi ciia LED laser diode cho phep cong sua't anh sang d budc song i300nm vdi hai dai 0->lm\V va 1-rlOmVV (do chmh xac ±5%) May sir dung ddu PLN photodiode InGAsP cd connector quang FC va adaptor quang ihuan tien cho viec cong suat loi ciia module phat quang hoc, Ket qua dirge hien thi tren man tinh ihi Idng May cong suat quang dugc nudi b^ng nguon pin 9V thuan tien cho viec dac km dong Bg suy hao quang: Bg suy hao quang su dung sgi quang dan mode 9/125um cd gan connector quang FC va adaptor quang thuan lien cho viec su dung mang thong tin quang Do suy hao cd dinh hi lOdB cho budc song 1300nm (cd the thay ddi suy hao c&n tliiet) Cac ung dung dao tao vc thong tin quang ciia he thi nghiem he thdng tin quang sgi sd hoa 10Mbps: a) Giiip hoc vien nhan biei cac linh kien , thiet bi ca ban he thdng thong tin quang ( may phai quang (E/0), may thu quang (0/E) module ihu phai quang, may cong suat quang, bg suy hao quang, ) b) Do dac trung cong sual quang Idi phu ihugc dong kicli ciia module phat quang d che kich b;ing dong xung Do cong suai quang Idi ciia module phat d bucic song 1300nm c) Tim hie'u ve may phat xung TTL mot dai tan sd rgng (500kHz tdi lOMHz) lim hieu ve nguyen ly dieu bieii theo cudng cho laser diode d) Tim hiCu ve qua trinh thu tin hieu sd TTL qua sgi quang: khuech dai iin hieu, sua dang tin hieu khuech dai cong suat, de khoi phuc dang tin hieu e) 'nuc hanh thiet ke dudng truydn sgi quang dan gian, tinh toan suy hao ciia dudng truyen du trff cong suat, Tliuc hanh truyen din qua cap sgi quang cac loai tin hieu sd lieu, tin hieu thoai duae ma hoa PCM, Manchester, Bg bien dieu PCM va thuc hanh ma hoa Manchester: B6 bien dieu PCM va thuc hanh ma hoa Manchester ket hgp vdi thiet bi thi nghidm thdng tin quang sgi sd hoa tdc 10Mbps (lam thiet bi dau cudi quang) dtrgc trinh bay trSn hinh 12 Hlah 12: Bg bien dieu PCM va thuc hanh ma hoa Manchester ket hgp vdi thiet bi thi nghiem thdng tin quang sgi sd hoa tdc 10Mbps a) He thdng di^u che PCM: Ky thuat didu che PCMjhuc hien qua trinh ehuyen doi tin hieu thoai tuong tu luong PCM sd tdc 64 Kb/s la mot ky thuat dugc su dung kha bien Iinh vue truyen thong hien Trong he thdng dieu che PCM, chiing tdi da su dung vi mach MC 3057 Day la chip codec dugc su dung rong rai cong nghiep thdng tin lien lac He thdng cd the' chia cac khoi chinh nhu tren hinh 13 *"'^$^?*' i °'^'^*'' "'^"'"*'^^™** SYSTEM '••• " " " " ã ã ! 1 coupôNotr> ãCD IM i i ã ) pôj-ai > ã i ! I ! • •ACAHU' »o o ~ WatHi t: , o i =: _- MAXOttiTf K O*C0C»'lC i TMCtKmC \ l) ft -J •X • V ' • ] 1• • : • • • • DT/EFO O May c6ng suat quang r DD DD 71 \ 800/1 SOOnm • Cac nguon quang cr ciia DD DD s6 thii nhat va thii hai DD DD 850nm • ^ •• SOOnm ^?r^ Cac vong day thu 200/230 50/125- 10/125 = 200/220|am = 50/125 urn = 10/125 ^m • Cac sgi quang 100/130 50/125 - 10/125 A / \ ^ / / A A / \ B6 connector ST-ST \\\\\\\vm\ .mwxk A A Miliampe kg", v6n M, dao d6ng ki 100 MHz / / ^—- / ^ ^\_J 0 BAI THUC TAP SO a • CAC NGUON QUANG 2.1- Cac diro^g dac trimg • Bat ngu6n cho khdi • Thao cau n6'i Jl • Thao cau n6'i J2, noi miliampe ke vao vi tri ciia no • Noi vCn ke qua LED ( giiia J2 va diem ) • Noi LED vao may c6ng suat bing cac vong day 200/230 • Thay doi bien trcf ''thien ap" - Do dong If qua LED, dien ap Vp tren no va cOng suat quang d 161 P^,,! ta thu duae cac gia tri gio'ng nhu cac gia tri bang Hinh 2.1 • Ve thi dong va cac gia tri c5ng suat se thu dugc dudng cong cong suat nguon LED theo ham ciia dong ( Hinh 2.2 ) • Ghi cac gia tri dong va ap len thi, ta nhan dugc dudng bieu di6n ddng pilot theo ham cua ddng thien ap mot chieu ( Hinh 2.3 ) • Thay vdng sgi quang 200/230 blng vdng 50/125 hoac 10/125, se thay cong suat dugc giam xudng Vp IpmA mV p ^ Olll dBm 58 1900 -5 50 1850 -5.5 40 1780 -6.5 30 1700 -7.9 20 1610 -10.2 12 1530 -12.1 " Pout(d&m) Vp(mV)