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ETM7172 OPTICAL COMMUNICATION SYSTEMS Multimedia University
L5
Optical Fiber Linkand LAN e!i"n
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Table of content
Transmission Type
Elements in Network Design
Factors for Evaluating Fiber Optic System Design
Link Budget onsiderations
!ower Budget
!ower Budget "e#uirement
E$ample % Long&'aul Transmission System
E$ample % L(N
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ETM7172 OPTICAL COMMUNICATION SYSTEMS Multimedia University
Table of content )cont*+
Bandwidt' Budget
System "ise Time
E$ample on ST,&-. ST,&/0 and ST,&0-
Budget Summary
Sensitivity (nalysis
Eye Diagrams
Signal to Noise "atio )SN"+
ost1 !erformance onsiderations
Summary
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Transmission Types
Two types of transmissions:
1. Link (point to point)
2. Network
a. point to multipoint
b. Meshc. Rin
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Elements of Link1 Network Design
Transmitter %
Operating wavelengt' (). Linewidt' ( ).
"ise time. Bit&rate. Line format. !ower level
Fiber %
S,F1,,F. Fiber type 2 S,F34. DSF. etc.
able loss. Spool lengt'"$ %
!SEN. !S(T. "ise time
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%
ETM7172 OPTICAL COMMUNICATION SYSTEMS Multimedia University
Elements of Link1 Network Design )cont*+
onnection%
No* of splice. Splice loss
No* of connectors. onnector Loss
5n Line Devices%
Splitter. Filter. (ttenuator. (mplifier
5nsertion loss. 6ain
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The Main Problems
(ttenuation andLoss
Dispersion
The Main Question
5n Digital System
& Data "ate
& Bit Error "ate
5n (nalog System
& Bandwidt'
& Signal to Noise
"atios
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Factors for Evaluating Fiber Optic System Design
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System Factor onsi!erations
Mo!ulation o!e "M# FM# PM or Digital
$it Error %ate ($E%)
(Digital Systems Only)
&'
#&'&*
Typical
Signal to +oise %atio Specifie! in !ecibels (!$)+umber of onnectors ,oss increases -ith the number of
connectors
+umber of Splices,oss is ,oss increases -ith the
number of splices
Environmental
%e.uirements
/umi!ity# Temperature#
E0posure to sunlight
Mechanical %e.uirements Flammability# 1n!oor2Out!oor
"pplication
Factors for Evaluating Fiber Optic System Design
(cont3)
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Optical Transmitter2 Sources
LEDs
Output !ower
,odulation
Bandwidt'
enter 7avelengt'
Spectral 7idt'
Source Si8e
Far&Field !attern
Laser Diodes
9 Output !ower
9 ,odulation
Bandwidt'9 enter 7avelengt'.
Number of ,odes
9 'irp. Linewidt'
9 ,ode Field of t'e6aussian beam
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Optical Fiber
,ultimode Fiber
(ttenuation
,ultimode
Dispersion
'romatic
Dispertion
Numerical (perture
ore Diameter
Single&,ode Fiber
9 (ttenuation
9 'romatic
Dispersion
9 utoff 7avelengt'
9 Spot Si8e
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Optical %eceiver2 Photo!io!e
9 "isetime1Bandwidt'
9 "esponse 7avelengt' "ange
9 Saturation Level
9 ,inimum Detection Level
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Si)ple Link
T* +*
Medium and Devices
OA
OA
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Link Budget Considerations
T'ree types of budgets%
)/+ !ower Budget)3+ Bandwidt' or "ise Time Budget
):+ ;
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!O7E" B
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!ower Budget "e#uirements%
!B % !"=> !,5N
!"=? "eceived !ower!,5N? ,inimum !ower at a certain BE"
!"= ? !T=2 Total Losses @ Total 6ain & !,("65N
!T=? Transmitted !ower
!,("65NA 0 dB
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Requirements Contd:
Loss.L ? L5L@ Lfiber@ Lconn*@ Lnon&linearL5L ? 5nsertion Loss
Lfiber ? Fiber Loss
Lconn*? onnector LossLnon&linear? Non&linear Loss
6ain.6 ? 6ainamp@ 6non&linear
6ainamp? (mplifier 6ain
6non&linear? Non&linear 6ain
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dB. dBm. m7
dB ? / log )!/1!3+
dBm Calue of / m7 !ower (pplication
* / /* m7 Typical laser !eak
Output
&/:* *7 Typical !5N
"eceiver
Sensitivity
&:* */ /*7 Typical (!D"eceiver
Sensitivity
&-* */ /*7 Typical LED !eak
Output
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!$ Po-er Out as a 4
of Po-er 1n
4 of Po-er
,ost
%emar5s
/ G 3/ &
3 0: : &
: H t'e power
- - 0 &
:3 04
0 3 I t'e power
3 4 /1 t'e power
4 /0 4- /10 t'e power
G /3 44 /14 t'e power
/ / G /1/ t'e power
Decibel to Po-er onversion
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!$ Po-er Out as a 4
of Po-er 1n
4 of Po-er
,ost
%emar5s
3E B*:D GG*FD /1:BB t'e power
:B B*/D GG*GD /1/BBB t'e power
-B B*B/D GG*GGD /1/B.BBB t'e power
EB B*BB/D GG*GGGD /1/BB.BBB t'e power
Decibel to Po-er onversion
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IS THIS
SYSTEMGOOD
E!amp"e#$o%er Budget Measurement &or Long
Hau" Transmission
PT, - ( d.)
1&5 k)
PSEN - /2&d.)
Sp"ice
Atten0atin Cecient3 - (425 d.k)
i!per!in Cecient3 - 1& p!n)/k)
N0)ber 6 Splice - $%
Splice L!! - (41 d.
PMar"in- % d.
Cnnectr L!! - (42 d.
Connector
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CO'CL(SIO'# B)D
SYSTEM**
Si)ple Calc0latin4
Fiber L!! - (425 d.k) * 1&5 k)
- $%4# d.
Splice L!! - (41 d. * $% - $4% d.
PMar"in- % d.
Ttal L!!e! - $%4# 8 $4% 8(4$ - 514# d.
Po-er $u!get# P%67 PSE+ 88
P+* - /574#
d.
P+* - PT*9 Ttal L!!e! 9PMar"in - ( 9 514# 9 %
Cnnectr L!! - (42 d. * 2
- (4$ d.
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:; TSler
.0t ?@at i! t@e "ain
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Fir!t ;e calc0late t@e a)pli>er! "ain44
Bain PSEN/ P+*
Bain /2& 9 /574#D
Bain 2'4# d.
T )ake it ea!3Bain #( d.
N;?@ere t p0t t@ea)pli>er=
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T@ree c@ice! aer 9 At t@e tran!)itter
Prea)pli>er 9 At t@e recei
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Let 0! c@eck ne b ne
P;er A)pli>er PT*8 Bain -POUT ( 8 #( - #(
d.).0t i! t@ere an p;er a)pli>er ;it@ #( d.)
POUT= NO3 T:E+E ISNT
:ence
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?@at ab0t Prea)pli>er=
POUTreceier ;it@ #( d. a
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Let us c+eck In Line )mp"i,ers
#( d. "ain a)pli>er a
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?@ere i! t@e 9#( d.) pint=
PT*9 L!! At T@at Pint - ( d.) 9 #(d.
L!! At T@at Pint - /#( d.)
#( - , Len"t@ 6 T@atPint+e)e)ber - (4253
Pint Len"t@ - #((425
- 12( k)
.0t 12( k) 6r) T,3N4 6 !plice - 12($
- #(
A!!0)e Ot@er L!! - (3 L!! At T@at Pint - Fiber L!!3
Splice L!! - (41 d. , #( - # d.
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Al! re)e)ber cnnectr l!! at a)pli>er and T,
2 cnnectr!
Cnnectr L!! - (42 d. , # - (4% d.
Ttal L!!e! - Fiber L!! 8 Splice L!! 8 Cnnectr L!
Act0all3 at 12( k)3
- #( 8 # 8 (4% - ##4% d.
##4% d. G #( d.HH NOT BOOHN;3 ?e @a
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Let 0! cn>r) t@e an!;erAt 1(54% k) 6r) T,3
Fiber L!! - (425 , 1(54% - 2%4$ d.
N4 6 Splice at 1(54% k) - 1(54%$ -2%4$ - 27
Splice L!! - (41 , 27 - 247 d.
Ttal L!!e! - 2%4$ 8 247 - 2'41 d.
2'41 d. #( d. HH
CO'-I.M/01234 5M IS ) GOOD LOC)TIO'**
PT, - ( d.)
1&5 k)
PSEN - /2& d.)Sp"ice Connector
1(54%JM
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#2
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IS THIS
SYSTEMGOOD
PT, - /15 d.)
5(( )
U!in"
&5(n) PSEN - /25d.)Atten0atin Cecient3 - $45 d.k)
i!per!in Cecient3 - 1& p!n)/k)
N0)ber 6 Splice - (
Splice L!! - ( d.
PMar"in- 2 d.
Cnnectr L!! - (45 d.
Server A Server B
E!amp"e#$o%er Budget Measurement &or L)'
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ETM7172 OPTICAL COMMUNICATION SYSTEMS Multimedia University
.AN?IT:.UBET
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#$
ETM7172 OPTICAL COMMUNICATION SYSTEMS Multimedia University
Calc0late t@e ttal ri!e ti)e!
T,3 Fiber3 +,
Calc0late Fiber ri!e ti)e3 TFiber
T>ber- ,
, L - i!per!in Cecient- Line;idt@L - Fiber Len"t@
T, +i!e Ti)e3 TT*- nr)all "i
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#5
ETM7172 OPTICAL COMMUNICATION SYSTEMS Multimedia University
Ttal +i!e ti)e3 T!!
T!!-141TT*28T+*28T>ber2D12
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#%
ETM7172 OPTICAL COMMUNICATION SYSTEMS Multimedia University
.and;idt@ .0d"et
T* +*
Medium and Devices
T
9: ; T< T
T
OA
OA
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#7
ETM7172 OPTICAL COMMUNICATION SYSTEMS Multimedia University
7'at is a good "ise time;
Fr a "d receptin 6 !i"nalT!E! (47 , P0l!e ?idt@ P?D
P? - 1.it+ate 6r N+K
12.it+ate 6r +K
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ETM7172 OPTICAL COMMUNICATION SYSTEMS Multimedia University
E!amp"e#.ise Time Budget Measurement
&or Long Hau" )pp"ication
T, ri!e ti)e3 TT*- (41
n!+, ri!e ti)e3 T+*- (45
n!Line;idt@D - (415 n)
i!per!in Cecient3 - 1& p!n)/k)Fiber len"t@ - 15(k)
.it +ate - %22Mbp!Fr)at - +K
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ETM7172 OPTICAL COMMUNICATION SYSTEMS Multimedia University
Fiber ri!e ti)e3 TF-Len"t@ , ,
Line;idt@D - 15( k) , 1& , (415 n)
- (4$ n!
Ttal +i!e ti)e3 TSYS- 141TLS28 TP28
TF2
- 141(4(1 8 (425 8 (41%
Si)ple Calc0latin4
TSYS- (477 n!
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ETM7172 OPTICAL COMMUNICATION SYSTEMS Multimedia University
Let !a3.it +ate - STM $ - %22 Mbp!Fr)at - +K
T!! (47 , P0l!e ?idt@ P?D
P0l!e ?idt@ P?D - 1%22,1(%D
- 14% n!
(477 n! (47 , 14%n!
(477 n! 141 n! HH
Bd +i!e Ti)e .0d"etHH
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$1
ETM7172 OPTICAL COMMUNICATION SYSTEMS Multimedia University
Let !a3.it +ate - STM 1% - 245 Bbp!Fr)at - +K
T!! (47 , P0l!e ?idt@ P?D
P0l!e ?idt@ P?D - 1245,1('D
- (4$ n!
(477 n! (47 , (4$n!
(477 n! (42& n! HH
.ad +i!e Ti)e .0d"etHH
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$2
ETM7172 OPTICAL COMMUNICATION SYSTEMS Multimedia University
!u"et #ummary Option Po-er
$u!get
$an!-i!th
$u!getFinancial
" Source (,ED vs3 ,D)
9=
4nm ,ediocre Bad 'eap
/:/nm 6ood 6ood Less
e$pensive
/nm Cery good Cery good E$pensive
Mo!ulation
$an!-i!th
LED N( Bad 'eap
LD N( 6ood E$pensive
Output Po-er LED ,ediocre N( 'eap
LD 6ood N( E$pensive
%a!iation pattern LED )far&field pattern+
N( Bad 'eap
LD )6aussian
beam+
N( 6ood E$pensive
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$#
ETM7172 OPTICAL COMMUNICATION SYSTEMS Multimedia University
!u"et #ummary
$ Fiber Option $o%erBudget
$an!-i!th
$u!getFinancial
(ttenuation ,, ,ediocre ,ediocre 'eap
S, 6ood 6ood E$pensive
Dispersion ,, ,ediocre ,ediocre 'eap
S, 6ood 6ood E$pensive
Numerical (perture
)N(+
,, ,ediocre ,ediocre 'eap
S, 6ood 6ood E$pensive
ore Diameter ,, ,ediocre ,ediocre 'eap
S, 6ood 6ood E$pensive
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$$
ETM7172 OPTICAL COMMUNICATION SYSTEMS Multimedia University
!u"et #ummary
%eceiver (P1+ vs3
"PD)
Option $o%erBudget
$an!-i!th
$u!get
Financial
"ise time1
Bandwidt'
!5N ,ediocre ,ediocre 'eap
(!D 6ood 6ood E$pensive
"esponse
wavelengt' range
!5N ,ediocre ,ediocre 'eap
(!D 6ood 6ood E$pensive
Saturation Level !5N ,ediocre ,ediocre 'eap
(!D 6ood 6ood E$pensive
,inimum detectionlevel
!5N ,ediocre ,ediocre 'eap
(!D 6ood 6ood E$pensive
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Sensitivity (nalysis
,inimum optical power t'at must
be present at t'e receiver in order
to ac'ieve t'e performance level
re#uired for a given system*
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Factors will affect t'is analysis
/* Source 5ntensity Noise & "efers to noise generated by t'eLED or Laser
!'ase Noise & t'e difference in t'e p'ases of two
optical wavetrains separated by time. cut out of t'e
optical wave(mplitude Noise & caused by t'e laser emission
process*
3* Fiber Noise
"elates to modal partition noise
:* "eceiver Noise
!'otodiode. conversion resistor
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-* Time Jitter and 5ntersymbol 5nterference
Time Jitter & s'ort term variation or instability in t'e
duration of a specified interval
5ntersymbol 5nterferenceresult of ot'er bits interfering wit' t'e bit of interest
inversely proportional to t'e bandwidt'
Eye diagrams & to see t'e effects of time Kitter and
intersymbol interference
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ETM7172 OPTICAL COMMUNICATION SYSTEMS Multimedia University
* Bit error rate & main #uality criterion for a digital
transmission system
BE" ? M5,5N31 )- 3N3 $)
w'ere %
N ? Noise power spectral density )(318+
5,5N ? ,inimum effective signal amplitude )(mps+
B ? Bandwidt'
)$+ ? umulative distribution function )6aussian distribution+
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Eye Diagrams
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Signal to Noise "atio
SN" ? S1NS & represents t'e information to be transmitted
N & integration of all noise factors over t'e full system bandwidt'
SN" )dB+ ? / log/B)S1N+
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ETM7172 OPTICAL COMMUNICATION SYSTEMS Multimedia University
ost1!erformance onsiderations
omponents considerations suc' as %
Lig't Emitter Type
Emitter 7avelengt'
onnector Type
Fiber TypeDetector Type
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Summary
T'e key factors t'at determine 'ow far one can
transmit over fiber are transmitter optical output
power. operating wavelengt'. fiber attenuation.
fiber bandwidt' and receiver optical sensitivity*
T'e decibel )dB+ is a convenient means of
comparing two power levels*
T'e optical link loss budget analy8es a link toensure t'at sufficient power is available to meet
t'e demands of a given application*
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5#
ETM7172 OPTICAL COMMUNICATION SYSTEMS Multimedia University
Summary
"ise and fall times determine t'e overall responsetime and t'e resulting bandwidt'*
( sensitivity analysis determines t'e amount ofoptical power t'at must be received for a system to
perform properly*
Bit errors may be caused by source intensity noise.fiber noise. receiver noise. time Kitter and
intersymbol interference*T'e five c'aracteristics of a pulse are rise time.
period. fall time. widt' and amplitude*
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T
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5%
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T'ank Pou
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