Mon Mang Truyen Tai Quang

7/22/2019 Mon Mang Truyen Tai Quang

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GII THIU CHUNG V PHN MM OPTISYSTEM1

HC VIN CNG NGH BU CHNH VIN THNG

KHOA VIN THNG 1

B MN THNG TIN QUANG

BI GING THC HNH

MN MNG TRUYN TI QUANG

H O TO : I HC


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Cng vi s bng n v nhu cu thng tin, cc h thng thng tin quang ngy cng tr nn phc tp. phn tich, thit k cc h thng ny bt buc phi s dng cc cng c m phng

OptiSystem l phn mm m phng h thng thng tin quang. Phn mm ny c kh nng thit k, o kim trav thc hin ti u ha rt nhiu loi tuyn thng tin quang, da trn kh nng m hnh ha cc h thngthng tin quang trong thc t. Bn cnh , phn mm ny cng c th d dng m rng do ngi s dng c

th a thm cc phn t t nh ngha vo.Phn mm c giao din thn thin, kh nng hin th trc quan.

1. CC NG DNG CA OPTISYSTEM

Optisystem cho php thit k t ng hu ht cc loi tuyn thng tin quang lp vt l, t h thng ngtrc cho n cc mng LAN, MAN quang. Cc ng dng c th bao gm:

- Thit k h thng thng tin quang t mc phn t n mc h thng lp vt l

- Thit k mng TDM/WDM v CATV

- Thit k mng FTTx da trn mng quang th ng (PON)- Thit k h thng ROF (radio over fiber)

- Thit k b thu, b pht, b khuch i quang

- Thit k s tn sc

- nh gi BER v penalty ca h thng vi cc m hnh b thu khc nhau

- Tnh ton BER v qu cng sut tuyn ca cc h thng c sng dng khuch i quang.

- ..

2. CC C IM CHNH CA OPTISYSTEM

2.1 Th vin cc phn t (Component Library)

Optisystem c mt th vin cc phn t phong ph vi hng trm phn t c m hnh ha c png ging nh cc thit b trong thc t. C th bao gm:

- Th vin ngun quang

- Th vin cc b thu quang

- Th vin si quang

- Th vin cc b khuch i (quang, in)

- Th vin cc b MUX, DEMUX

- Th vin cc b lc (quang, in)

- Th vin cc phn t FSO

- Th vin cc phn t truy nhp

- Th vin cc phn t th ng (quang, in)

- Th vin cc phn t x l tn hiu (quang, in)

- Th vin cc phn t mng quang

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- Th vin cc thit b o quang, o in

Ngoi cc phn t c nh ngha sn, Optisystem cn c:

- Cc phn t Measured components. Vi cc phn t ny, Optisystem cho php nhp cc tham sc o t cc thit b thc ca cc nh cung cp khc nhau.

- Cc phn t do ngi s dng t nh ngha (User-defined Components)

2.2 Kh nng kt hp vi cc cng c phn mm khc ca Optiwave

Optisystem cho php ngi dng s dng kt hp vi cc cng c phn mm khc ca Optiwave nhOptiAmplifier, OptiBPM, OptiGrating, WDM_Phasar v OptiFiber thit k mc phn t.

2.3 Cc cng c hin th

Optisystem c y cc thit b o quang, o in. Cho php hin th tham s, dng, cht lng tn hiuti mi im trn h thng.

Thit b o quang:

- Phn tch ph (Spectrum Analyzer)

- Thit b o cng sut (Optical Power Meter)

- Thit b o min thi gian quang (Optical Time Domain Visualizer)

- Thit b phn tch WDM (WDM Analyzer)

- Thit b phn tch phn cc (Polarization Analyzer)

- Thit b o phn cc (Polarization Meter)...

Thit b o in:

- Oscilloscope- Thit b phn tch ph RF (RF Spectrum Analyzer)

- Thit b phn tch biu hnh mt (Eye Diagram Analyzer)

- Thit b phn tch li bit (BER Analyzer)

- Thit b o cng sut (Electrical Power Meter)

- Thit b phn tch sng mang in (Electrical Carrier Analyzer)...

2.4 M phng phn cp vi cc h thng con (subsystem)

vic m phng c thc hin mt cch linh hot v hiu qu, Optisystem cung cp m hnh m phngti cc mc khc nhau, bao gm mc h thng, mc h thng con v mc phn t.

2.5 Ngn ng Scipt mnh

Ngi s dng c th nhp cc biu din s hc ca tham s v to ra cc tham s ton cc. Cc tham ston cc ny s c dng chung cho tt c cc phn t v h thng con ca h thng nh s dngchung ngn ng VB Script.

2.6 Thit k nhiu lp (multiple layout)

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Trong mt file d n, Optisystem cho php to ra nhiu thit k, nh ngi s dng c th to ra vsa i cc thit k mt cch nhanh chng v hiu qu. Mi file d n thit k ca Optisystem c th chanhiu phin bn thit k. Mi phin bn c tnh ton v thay i mt cch c lp nhng kt qu tnhton ca cc phin bn khc nhau c th c kt hp li, cho php so snh cc phin bn thit k mtcch d dng.

2.7 Trang bo co (report page)Trang bo co ca Optisystem cho php hin th tt c hoc mt phn cc tham s cng nh cc kt qutnh ton c ca thit k ty theo yu cu ca ngi s dng. Cc bo co to ra c t chc didng text, dng bng tinh, th 2D v 3D. Cng c th kt xut bo co di dng file HTML hoc didng cc file template c nh dng trc

2.7 Qut tham s v ti u ha (parameter sweeps and optimizations)

Qu trnh m phng c th thc hin lp li mt cch t ng vi cc gi tr khc nhau ca tham s ara cc phng n khc nhau ca thit k. Ngi s dng cng c th s dng phn ti uu ha caOptisystem thay i gi tr ca mt tham s no t c kt qu tt nht, xu nht hoc mt gimc tiu no ca thit k

3. GIAO DIN NGI S DNG (GUI)

Cc phn chnh ca GUI bao gm (xem hnh 1) :

- Project layout: l ni m ngi s dng th hin thit k

- Dockers, bao gm:

o Th vin cc phn t (Component Library): ngi s dng truy nhp vo y ly cc phn t

to ra thit k h thng

o Project Browser: s dng project browser cho php truy nhp n cc tham s v kt qu ca

thit k mt cch thun tin.

o Description: ni s dng c th a cc thng tin mt t tm tt v thit k

- Menu bar(xem hnh 2): cha cc menu c trong Optisystem

Hnh 1. Giao din ngi s dng ca Optisystem

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Hnh 2. Menu bar ca Optisystem

- Toolbars

Standard

Cha tt c cc nt thc hin cc hot ng thng thng ca window nh:to file, m file, lu, in n, copy, .. v chc nng tnh ton ca h thng.

Layout

Thc hin cc chc nng nh xa, sao chp layout trong d n. Thit lp sln qut tham s v ti u ha thit k.

Docker

Thc hin chc nng cho php hoc loi b docker trong main layout.

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Layout Tools

Thc hin cc chc nng nh di chuyn, kt ni, thay i cc phn t, vcc cng vo v ra ca phn t.

Draw Objects

V cc hnh ch nht, hnh trn, ng thng, a thm text hoc bitmapvo layout.

LayoutOperations

Thc hin phng to, thu nh thit k hoc ca s thit k. Cho php hocloi b chc nng t ng kt ni, iu khin s hin th ca layout.

Script

Chy, to ra, lu gi hoc ti cc file script

4. TM TT HNG DN S DNG MT S CHC NNG C BN CA OPTISYSTEM

4.1 M mt d n c sn:

- Vo File menu, la chn Open

- La chn ng dn trong File name ly c file mong mun

4.2 To mt d n mi

- Vo File menu, la chn New, ca s Project layout xut hin (hnh 3)

Hnh 3. Ca s Project layout

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- Vo Component Library, dng chut ko phn t cn s dng v th vo Main Layout (xem hnh 4)

Hnh 4. t phn t vo Main layout

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- Vic kt ni gia cc phn t trong thit k c th c thc hin mt cch t ng hoc bng taynh vic s dng cc nt chc nng trong Layout Operations (xem hnh 5, 6).

Hnh 5 . Kch hot kt ni t ng

Hnh 6. Hy b ch kt ni t ng

4.3 Thit lp cc tham s ton cc (global parameters) ca d n

Khi to mt thit k mi trn Optisystem, phi thit lp cc tham s ton cc. Cc tham s ny s linquan n tc , chnh xc v yu cu v b nh cho vic thc hin m phng thit k. Cc tham s

ny c gi l tham s ton cc v n nh hng n tt c cc thnh phn trong thit k c s dngcc tham s ny. Trong Optisystem, cc tham s ny bao gm:

- Tc bit (bit rate)

- Chiu di chui bit (Bit sequence length)

- S mu trn mt bit (Number of samples per bit).

Cc tham s ny c s dng tnh ton Time window (ca s thi gian), Sample rate (tc lymu) v Number of samples (s lng mu) nh sau:

- Time window = Sequence length * 1/Bit rate

- Number of samples = Sequence length * Samples per bit

- Sample rate = Number of samples / Time window

Optisystem dng chung tham s Time window cho tt c cc thnh phn trong thit k, tc l tt c ccthnh phn u c Time window ging nhau nhng c th c Sample rates hoc Number of samples lkhc nhau.

thit lp tham s ton cc ca d n, thc hin cc bc sau

- Kch p chut vo ca s Project layout

- Hoc La chn Layout > Parameters t thanh cng c MenuHp thoiLayout parametersxut hin (xem hnh 7).

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Hnh 7. Hp thoi Layout parameters

4.4 Hin th v thay i tham s ca cc phn t trong d n

- Kch p chut vo phn t cn thay i tham s

Hp thoi v cc tham s ca phn t xut hin

- Di chuyn con tr n cc gi tr tham s cn thay i

- Nhp gi tr tham s mong mun

Lu : C 3 ch ca tham s l Norman, Script v Sweep:

- Ch Script c s dng khi tham s ny l tham s ton cc, c nh hng n tt c cc phn

t khc ca h thng.- Ch Sweep c s dng khi thc hin qut tham s

Hnh 8. Hp thoi v cc tham s ca Laser Measured

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4.5 Chy m phng

- T File menu, la chn Calculate. Hp thoiOptisystem Calculations xut hin (hnh 9)

Hnh 9. File menu

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- Trong hp thoi Optisystem Calculations (hnh 10), kch chut vo nt Run

Hnh 10. Hp thoi Optisystem Calculations

4.6 Hin th kt qu m phng

- Kch p chut vo cc phn t hin th trong thit k hin th th v cc kt qu m qu trnhm phng to ra.

Hnh 11. Kt qu hin th trn thit b phn tch ph (v d)

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4.7 Thc hin qut tham s (Parameter Sweep)

Trong mi bn thit k s c mt s cc tham s nht nh c th a vo ch qut (sweep mode).Ngi thit k c th nh ngha s ln qut c thc hin trn mi tham s. Gi tr ca tham s s thayi qua mi ln qut. Qu trnh ny s cho cc kt qu thit k khc nhau ty theo s thay i gi tr catham s.

thc hin qut tham s, tin hnh cc bc nh sau:

a. Thit lp s ln qut:

- Bc 1: Kch chut vo nt Set Total Sweep Iterarions trn Layout tool bar

Hp thoiTotal Parameter Sweep Iterationxut hin gi tr hin ti (v d nh trn hnh 12)

- Bc 2: Nhp vo s ln qut

- Bc 3: Kch chut vo nt OK

Hnh 12. Hp thoi Total Parameter Iteration

Hoc:

- Bc 1: La chn Layout > Set Total Sweeps Iterations trn Menu toolbar (xem hnh 13)

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Hp thoiTotal Parameter Sweep Iterationxut hin gi tr hin ti (v d nh trn hnh 12)

- Bc 2: Nhp vo s ln qut


Hnh 13. Truy nhp qua Layout - Set Total Sweep Iterations

b. Thay i s ln qut

Sau khi tnh ton, d thay i s ln qut hin th trn bn thit k (layout), thc hin cc bc sau:

- Bc 1: La chn Layout > Set Current Sweep Interation trn Menu toolbar

Hp thoiSet Current Sweep Iterarion xut hin nh trn hnh 14

- Bc 2: Nhp vo s ln qut mun hin th trn bn thit k


Hnh 14 . Hp thoi Current Sweep Iteration

S dng nt Previous Sweep Iterarion hoc Next Sweep Iteration trn Layout toolbar chuyn giacc ln qut.

Hoc: La chn ln qut trn Set Current Iteration drop-down box nh trn hnh 15 di y

Hnh 15 . Set Current Iteration drop-down box

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c. Thay i gi tr tham s qut:

Sau khi la chn s ln qut tham s, phi thc hin nhp cc gi tr cn qut ca tham s. Trc khinhp, tham s cn qut phi c chuyn sang ch Sweep Mode.

La chn Sweep mode

chuyn sang Sweep mode cho tham s cn qut, thc hin cc bc sau:

o Bc 1: La chn Layout > Parameter Sweep trn Menu toolbar.

Hp thoi v cc tham s ca phn t xut hin nh trn hnh 17o trong ct Mode, la chn ch Sweep mode (xem hnh 16)

Hnh 16. Sweep mode

Hnh 17. Tham s ca phn t - Tham s ch Sweep mode

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o Kch chut vo nt Parameter Sweep trong ct Value ca tham s cn qut ( Sweep

Mode) (nh minh ha trn hnh l tham s Power). Hp thoi Parameter Sweeps xut hinnh trn hnh 18 di y.

Hnh 18. Cc gi tr tham s cn qut ca phn t trn thit k

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Nhp gi tr tham s qut:

nhp cc gi tr cn qut ca tham s, thc hin cc bc sau:

o Bc 1: La chn Layout > Parametertrn Menu toolbar

o Bc 2: Kch chut vo nt Parameter Sweep trn ct Value ca tham s

o Bc 3: Nhp d liu bng tay hoc s dng cng c Spread Tool nhp d liu

(Tham kho thm trong ti liu v vic s dng Spread Tool)

d. Chy m phng (thc hin tng t nh phn 4.6)

e. Hin th kt qu m phng qut tham s:

hin th kt qu m phng qut tham s (i vi thit k h thng, thng hin th s thay i BERtheo gi tr ca tham s qut), thc hin cc bc sau:

o Bc 1: La chn Report tab trong ca s Project Layout

o Bc 2: Kch chut vo nt Opti2Dgraph trn Report toolbar

o Bc 3: Trong Project Browser, la chn tham s Sweep Mode, ko tham s ny

v th vo trc X ca th 2D

o Bc 4: Trong Project Browser, la chn tham s Min. Log of BER ca thit b phn tch libit, ko tham s ny v th vo trc Y ca th 2D

Kt qu thay i BER theo tham s qut s hin th trn th 2D.

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Hnh 19. Cc bc hin th kt qu m phng qut tham s

4.8 a kt qu m phng vo bo co a kt qu m phng vo bo co c th s dng k thut chp mn hnh. Cc bc thc hin nhsau:

- Bm t hp phm Alt + Print Screen SyRq lu tm thi ca s mn hnh mun chp voClipboard

- Bm vo Start > Programs > Accessories > Paint khi ng chng trnh Paint

- Vo menu Edit trong Paint ri bm chn Paste (hoc t hp Ctrl + V) dn ca s mn hnh chp t Clipboard vo ca s lm vic ca Paint

- S dng cc cng c Select trong Paint ly phn thng tin mun sao chp li theo mun.

- Bm vo menu File > Save As t tn cho tm hnh vo chn ni lu tm hnh chp vo mytnh. C th lu di dng *.bmp, *.jpg, *.jpeg hoc *.dib. Hoc dn ngay vo trong file bo co (sdng phm Ctrl + V)

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BI THC HNH

BI S 1

Tn bi: S dng phn mm OptiSystem m phng h thng n knh quang

M s 01S tit: 4

Thuc mn hc: Mng truyn ti quang

H o to: i hc

1. MC CH

- Gip sinh vin lm quen vi vic s dng cng c m phng OptiSystem

- ng dng trong vic thit k h thng thng tin quang n knh n gin

2. NI DUNG THC HANH

Bc 1: S dng phn mm Optisystem xy dng m hnh m phng h thng thng tin quang n knh ngin vi cc thng s nh sau:

- Tham s h thng

o Tc bit: 2.5Gbit/s

o Khong cch truyn dn: 100 km

- Cc tham s ton cc (global parameters m phng):

o Tc bit: 2.5 Gbit/s

o Chiu di chui: 128 bits

o S mu trong 1 bit: 64

- Ngn pht: iu ch trc tip

- Si quang: Si n mode chun

- B thu: Photodetector PIN kt hp vi b lc thng thp Bessel

- Cc thit b o trn tuyn c t ti cc v tr ph hp xc nh c cht lng v dng tn hiuti cc im cn thit trn tuyn.

o Thit b o cng sut quang

o Thit b phn tch ph quang

o Thit b phn tch BER

Bc 2: Chy m phng

Bc 3: Hin th kt qu m phng bng cc thit b o t trn tuyn

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Bc 4: La chn mt tham s no ca phn t trong thit k thc hin qut tham s

3. BO CO KT QU THC HNH

- M hnh m phng

- Cc tham s m phng chi tit

- Kt qu m phng

- La chn mt tham s no ca mt trong cc phn t trn tuyn, thc hin qut tham s khost s thay i BER theo tham s qut

- Nhn xt, phn tch kt qu m phng

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BI S 2

Tn bi: S dng phn mm OptiSystem thit k h thng thng tin quang WDM

M s 02

S tit: 4

Thuc mn hc: Mng truyn ti quangH o to: i hc

1. MC CH

Gip sinh vin s dng c cng c m phng Optisystem trong vic thit k tuyn thng tin quang WDM.

2. NI DUNG THC HANH

Bc 1: Xy dng phng n thit k h thng thng tin quang WDM c s dng khuch i quang EDFAvi cc yu cu thit k nh sau:

- Tc bit: 10 Gbit/s

- C ly truyn dn: 400 km

- S lng knh bc sng: 8 knh

- Loi si: Si quang n mode chun

- Ngun pht: Dng iu ch ngoi

- B thu: S dng PIN kt hp vi b lc thng thp Bessel

Bc 2: S dng phn mm Optisystem xy dng m hnh m phng h thng thng tin quang WDM theo

phng n thit k.

Lu : cc tham s ton cc (global parameters m phng) c thit lp nh sau

- Tc bit: 10 Gbit/s

- Chiu di chui: 128 bits

- S mu trong 1 bit: 64

Bc 3: a cc thit b o vo m hnh m phng. Cc thit b o trn tuyn c t ti cc v tr ph hp xc nh c cht lng v dng tn hiu ti cc im cn thit trn tuyn.

- Thit b o cng sut quang

- Thit b phn tch ph quang

- Thit b o BER

Bc 4: Chy m phng


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Bc 6: Thay i cc tham s ca cc phn t trn tuyn t c BER = 10-12


- M hnh m phng


- Kt qu m phng

o Kt qu m phng theo phng n thit k ban u h thng ban u

o S thay i ca cc tham s thit k t c BER = 10-12


BI S 3

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Tn bi: Kho st nh hng ca si quang n cht lng truyn dn ca h thng WDM

M s 03

S tit: 4

Thuc mn hc: Mng truyn ti quang

H o to: i hc

1. MC CH

Gip sinh vin s dng c cng c m phng Optisystem trong vic kho st c nh hng ca cc casi quang n cht lng ca h thng WDM. C th:

- nh hng ca suy hao

- nh hng ca tn sc

- nh hng ca hiu ng phi tuyn

2. NI DUNG THC HANH

Bc 1: S dng phn mm Optisystem xy dng m hnh m phng h thng thng tin quang WDM vi ccthng s nh sau:

- Tham s h thng

o Tc bit: 2.5 Gbit/s / 10 Gbit/s

o S lng knh: 8/16

o Khong cch knh: 100GHz/50 GHz

o Khong cch truyn dn: 100 km

- Cc tham s ton cc (global parameters m phng):

o Tc bit: 2.5 Gbit/s / 10 Gbit/s

o Chiu di chui: 128 bits

o S mu trong 1 bit: 64

- Ngn pht:

o S dng iu ch: iu ch ngoi dng b iu ch Mach-Zehnder

- Si quang:

o Loi si: S dng cc loi si khc nhau kho st nh hng

- B thu: Photodetector PIN kt hp vi b lc thng thp Bessel

Bc 3: a cc thit b o vo m hnh m phng. Cc thit b o trn tuyn c t ti cc v tr ph hp xc nh c cht lng v dng tn hiu ti cc im cn thit trn tuyn.

- Thit b o cng sut quang

- Thit b phn tch ph quang

- Thit b o BER

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Bc 3: Chy m phng


Bc 5: Thay i cc tham s:

- Tc truyn dn

- Cng sut ngun pht

- Tham s ca si quang

Xy dng cc kch bn kho st nh hng ca suy hao, tn sc v hiu ng phi tuyn trong si quangn cht lng v kh nng truyn dn ca h thng WDM.


- M hnh m phng


- Kt qu m phng

o Kt qu m phng h thng ban u

o Kt qu m phng vi cc kch bn c a ra nhm kho st nh hng ca suy hao,

tn sc v hiu ng phi tuyn trong si quang n cht lng v kh nng truyn dn ca hthng.


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