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Link Engg.ppt
1.
© BHARAT SANCHAR
NIGAM LIMITED Slide No. 1 of 16 Link Engineering
2.
© BHARAT SANCHAR
NIGAM LIMITED Slide No. 2 of 16 Objective of the presentation Power Budget Definition Power Margin Link Loss Budget Examples
3.
© BHARAT SANCHAR
NIGAM LIMITED Slide No. 3 of 16 Power budget is the difference between: The minimum (worst case) transmitter output power The maximum (worst case) receiver input required Power budget value is normally taken as worst case. In practice a higher power budget will most likely exist but it cannot be relied upon TRANSMITTER RECEIVER Fibre, connectors and splices Power Budget (dB) Power Budget Definition
4.
© BHARAT SANCHAR
NIGAM LIMITED Slide No. 4 of 16 Power budget r t P P losses Pr must be higher than the sensitivity of the receiver Pr = power received (dBm) Pt = power transmitted (dBm) losses = sum of all losses (dB) • Cable losses • Connector losses • Source-to-cable interface loss • Cable-to-light interface loss • Splicing loss • Cable bends
5.
© BHARAT SANCHAR
NIGAM LIMITED Slide No. 5 of 16 dB, dBm, mW dB = 10 log (P1/P2) dBm Value % of 1 mW Power Application 0.0 100% 1.0 mW Typical laser Peak Output -13.0 5% 50.0W Typical PIN Receiver Sensitivity -30.0 0.1% 1.0W Typical APD Receiver Sensitivity -40.0 0.01% 100.0W Typical LED Peak Output
6.
© BHARAT SANCHAR
NIGAM LIMITED Slide No. 6 of 16 Power budget calculations can produce a number of different results depending on how they are carried out. To check if adequate receiver power will be available, under all conditions Based on a knowledge of the receiver sensitivity to determine the maximum loss of some component. Use of Power Budgets
7.
© BHARAT SANCHAR
NIGAM LIMITED Slide No. 7 of 16 •Assume worst case transmitter output power is -10 dBm and the worst case receiver input power needed is -25 dBm •Power budget = - 10 dBm - ( - 25 dBm ) = 15 dB •That is 15 dB of attenuation is possible over the link before failure occurs •As a simple example to find the maximum fibre attenuation we eliminate from the 15 dB budget the loss due to connectors and splices Less Connector attenuation = 1 dB Total splice attenuation = 1.2 dB So, Total fibre attenuation allowed = 15 - 1 - 1.2 = 12.8 dB Simple example to find total fibre loss allowed: Use of Power Budgets
8.
© BHARAT SANCHAR
NIGAM LIMITED Slide No. 8 of 16 Power margins are included for a number of reasons: To allow for ageing of sources and other components. To cater for extra splices, when cable repair is carried out. To allow for extra fiber, if rerouting is needed in the future. To allow for upgrades in the bit rate or advances in multiplexing. Remember that the typical operating lifetime of a communications transmission system may be as high as 20 to 30 years. No fixed rules exist, but a minimum for the power margin would be 2 dB, while values rarely exceed 8-10 dB. (depends on system) Power Margin
9.
© BHARAT SANCHAR
NIGAM LIMITED Slide No. 9 of 16 Fibre is normally only available in fixed lengths up to 2 km long, so fusion splices are required, to join lengths. In buildings fibre lengths will be much shorter In most systems only two connectors are used, one at the transmitter and one the receiver terminal. Power budget calculation including power penalty used to calculate power margin Transmitter o/p power (dBm) Number of Connectors Connector loss per connector (dB) Total connector loss (dB) Fibre span (km) Fibre loss (dB/Km) Total fibre loss (dB) Splice interval (Km) Number of splices Splice loss per splice (dB) Total splice loss (dB) Dispersion penalty estimate (dB) Receiver sensitivity (dBm) Power margin (dB) 0 2 0.5 1 70 0.25 17.5 0.8 87 0.04 3.46 1.5 -30 6.54 Answer System: 70 km span, 0.8 km between splices Sample Power Budget Calculation (Telecoms)
10.
© BHARAT SANCHAR
NIGAM LIMITED Slide No. 10 of 16 Splices within patchpanels and other splice closures In most systems connectors are used at the transmitter and receiver terminals and at patchpanels. Power budget calculation used to calculate power margin Transmitter o/p power (dBm) Number of Connectors Worst case Connector loss (dB) Total connector loss (dB) Fibre span (km) Maximum Fibre loss (dB/Km) Total fibre loss (dB) Number of 3M Fibrlok mechanical splices Worst case splice loss per splice (dB) Total splice loss (dB) Receiver sensitivity (dBm) Power margin (dB) -18.5 dBm min, -14.0dBm max 6 0.71 4.26 2.0 1.5 dB at 1300 nm 10 0.19 1.9 -30 dBm min 2.34 Answer Available power budget: 11.5 dB using worst case value (>FDDI standard) Total loss: 9.16 dB 3.0 Sample Power Budget Calculation
11.
© BHARAT SANCHAR
NIGAM LIMITED Slide No. 11 of 16 An optical fibre system is to operate at 622 Mbits/sec over a distance of 71 km without repeaters. Fibre with a worst case loss of 0.25 dB/km is available. The average distance between splices is approximately 1 km. There are two connectors and the worst case loss per connector is 0.4 dB. The power margin is to be at least 5 dB. The receiver sensitivity is -28 dBm and the transmitter output power is +1 dBm Determine the maximum allowable attenuation per fusion splice Sample Power Budget Exercise #1
12.
© BHARAT SANCHAR
NIGAM LIMITED Slide No. 12 of 16 Transmitter output power +1 dBm Worst case (lowest) optical output power Receiver sensitivity -28 dBm Minimum input optical power required Power Budget 29 dB Difference between transmitter and receiver levels. Less power margin 5 db Allowance for repair etc.. Less connector loss 0.8 dB Two connectors at 0.4 dB max. each. Less fibre loss 17.75 dB 71 km at 0.25 dB/km Calculated total maximum splice loss 5.45 dB eg. 29 - 5 - 0.8 - 17.75 dB = 5.45 dB Total number of splices 70 There are approximately 71 lengths of fibre in the link so there are approximately 70 splices Answer: Maximum splice loss 0.076 dB Solution to Exercise #1
13.
© BHARAT SANCHAR
NIGAM LIMITED Slide No. 13 of 16 Link Power/Loss Analysis Margin System ] [ ] / [ ] [ 2 ] [ ] [ ] [ km L km dB dB l P dBm P dBm P dB P f c T R s T Total Power Loss
14.
© BHARAT SANCHAR
NIGAM LIMITED Slide No. 14 of 16 Link Loss Budget Example A system has the following characteristics: LED power (PL) = 2 mW LED to fiber loss (Lsf) = 3 dB Fiber loss per km (FL) = 0.5 dB/km Fiber length (L) = 40 km Connector loss (Lconn) = 1 dB (one connector between two 20-m fiber lengths) Fiber to detector loss (Lfd) = 3 dB Receiver sensitivity (Ps) = –36 dBm Find the loss margin?
15.
© BHARAT SANCHAR
NIGAM LIMITED Slide No. 15 of 16 Solution LED power (PL) = 2 mW=3dBm
16.
© BHARAT SANCHAR
NIGAM LIMITED Slide No. 16 of 16 PTx = -15 dBm 500 m Using 850nm PSEN = -25 dBm Attenuation Coefficient, = 4.5 dB/km Dispersion Coefficient, D = 18 ps/nm-km Number of Splice = 0 Splice Loss = 0 dB PMargin = 2 dB Connector Loss = 0.5 dB Server A Server B Example: Power Budget Measurement for LAN IS THIS SYSTEM GOOD?
17.
© BHARAT SANCHAR
NIGAM LIMITED Slide No. 17 of 16
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