WisyCom MFL - OPTICAL LINK BUDGET; Link Budget Factors

MFL User Manual
16
Optical link budget
Optical link depends budget on the amount of losses along the fiber route. These losses vary according to the MFL
configuration and the type of fiber connection.
Calculating optical link budget refers to the following values:
 Single Mode Fiber attenuation is 0.2/0.4 dB/Km,
 optical TX laser power is 4mW (6dBm) and
 sensitivity of receiver module is 0.3mW (-5,22dBm)
 attenuations according to MFL configuration
Device
Attenuation*
multiplexer OMX
1,4 dB
multiplexer OMS
1,7 dB
splitter 1:2
3,7 dB
splitter 1:3
5,5 dB
splitter 1:4
7,9 dB
junction
0,2 dB
*Note that these are indicative values
Example: Fiber system with MFL-TTRR-OMS and MFL-RRTT-OMS
TX laser
6
dBm
multiplexer OMS
-1,7
dB
demultiplexer OMS
-1,7
dB
Internal junctions
-1
dB
Received power with short fiber
=1,6
dBm
Fiber link maximum length is 17 Km (=6.8/0.4) since receiver module sensitivity is -5,22dBm (considering 0.4dB/Km).
Example: Fiber system with MFL-TTTT-OMS-SPL1:2 and MFL-RRRR-OMS
TX laser
6
dBm
multiplexer OMS
-1,7
dB
demultiplexer OMS
-1,7
dB
Splitter 1:2
-3,7
dB
Internal junctions
-1
dB
Received power with short fiber
=-2,1
dBm
Fiber link maximum length is 7,8Km (=3.12/0.4) since receiver module sensitivity is -5,22dBm (considering 0.4dB/Km).