Table of Contents
Advertisement
1
58
Calculation of optical power budget
Calculation of optical power budget
Refer to
table 2
and
table 3
Table 2:
Input data for calculation of optical power budget
Type of optical Tx/Rx-module
Bit rate
Transmission code
Optical fibre
Optical connector
Optical wavelength
Spectral bandwidth
Transmitter Tx
Optical min output power (S)
Receiver Rx
10
Sensitivity for BER 0 10
(R)
Available power budget
Table 3:
Examples of optical power budget calculation
Terminal equipment
Available power budget (S_R)
Equipment margin
Type of optical connectors
Terminal box
Patch panel connectors
Connectors for S-R
Total available optical power
Optical cable
Type of optical fibre
Fibre attenuation (installed)
Splice attenauation
Av. cable length between splices
Average number of splices
Number of repair splices
Fibre margin
Total fibre attenuation per km
Maximum optical transmission dis-
tance
for maximum distance in a back-to-back application
General data
0
64 kbit/s
MCMI
Single mode
FC-PC
1300 nm
30.0 nm
LED
Pin Diode
FC-PC for single mode
FC-PC for single mode
0.5 dB each
Single mode 1300 nm
0.08 dB per splice
3.0 km
0.33 splice/km
0.10 splice/km
Chapter 8
Configuring the 56/64 kbit data
communication modules
Attenuation
-22 dBm
-38 dBm
-16 dB
Example 1
Example 2
16 dB
16 dB
Included
Included
0
0
Included
Included
16 dB
16 dB
0.22 dB/km
0.34 dB/km
0.027 dB/km
0.027 dB/km
0.008 dB/km
0.008 dB/km
0.010 dB/km
0.010dB/km
0.265 dB/km
0.385 dB/km
60 km
41 km
Advertisement
Table of Contents
