Ftth Designing Network Link

8/3/2019 Ftth Designing Network Link

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Presented by:

Anto Mathew

Midhun M.S

Jyothis Joy

Joseph Chacko


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Downstream TDM transmission with multiple listeners (encryption to insure privacy)

Upstream TDMA transmission with upstream transmissions (bursts) scheduled to preventoverlap

Downstream (single -fiber systems): 1490 nmUpstream: 1310 nmRF video (if present) 1555 nm

TDM Time Division MultiplexTDMA Time Division Multiple AccessCC Cross ConnectNB Narrow BandBB BroadbandOLT Optical Line TerminationONT Optical Network Termination

TDM

ONT2

ONT32

1:32 Optical splitter(or 1:64 for shorter reaches or

with Reach Extender)

OLT

AccessNode

NB

BB

CC Video

Data

E1/T1/Telephony

Data

E1/DS1

GbESTMn/OCn

ONT1

E1/DS1/Telephony

POTS

VOIP

(and/or)

TDMA

Up to 60 km* physical reach

(* with G.984.6 Reach Extender)


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OLT

ONU/ONT

OPTICAL SPLITTERS

OTDR

CONNECTORS

OPTICAL POWER SOURCE

POWER METER STM -16(Synchronous Transport Module)


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Splitter analysis and selectionLink design

Total system design

System implementation


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They are the network elements that put thepassive in Passive Optical Network and are

available in a variety of split ratios, including

1:4, 1:8, and 1:16.

Installed in each optical network betweenthe PONOLT and the ONTs

Networks implementing BPON,GPON , and

GEPON technologies all use these simple

optical splitters.


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1*2splitter 3.5 db

1*4splitter 7.4 db

1*8splitter 11 db

1*16splitter 14.3 db

1*32splitter 17.8 db


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VERIFICATION OF INSERTION LOSS CHECK

OF DIFFERENT TYPES OF SPLITTERSCOM 1

Measure

dat Port

Rx Level

(dBm)

Insertion Loss

(dB)

Limit

(dB)

Theorectical Value

(10log 1/ N)

1 -5.25 6.65 7.4 6.02

2 -5.06 6.46 7.4 6.02

3 -5.65 7.05 7.4 6.02

4 -5.27 6.67 7.4 6.02

1X4 SPLITTER

Downstream: Pathloss

Sending levelat +1.40dBm forwavelengthat1490nm at Com Port1


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Upstream: Pathloss

Sending levelat-3.20dBm forwavelengthat1310nm

COM 1

Feeding

at Port

Rx Level

(dBm)

Insertion Loss

(dB)

Limit (dB) TheorecticalValue

(10log 1/ N)

1 -10.00 6.80 7.4 6.02

2 -10.10 6.90 7.4 6.02

3 -10.25 7.05 7.4 6.02

4 -10.05 6.85 7.4 6.02


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CONCLUSION:

Case 1: When attenuator is placed before two splitters,

the distance limit for error free transmission is 8km and

maximum reachable distance is 15.2km.

Case 2: When attenuator is placed between two splitters,

the distance limit for error free transmission is 26km andmaximum reachable distance is 33.6km.

Case 3: When attenuator is placed after two splitters, the

distance limit for error free transmission is 24km and

maximum reachable distance is 32.4km.

In the above three cases, second case is better. Herefirst 1x4 splitting is done and after a long distance, again

each of them splitted into 8


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Tx =2.5dBm ,

Rx =-25dBm

CL=Spice loss+ fiber loss+connector loss+splitter loss

Dispersionpenalty

Extra power required by the system tocompensate the dispersion.

Pd = -10 log (1- (3.14B)^2 * dt^2)

Tx = Rx +CL +Ms+Pd


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To provide additional protection to the

system.

Compare the practical results with simulation

software outputs.


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Documents

Ftth Designing Network Link