User guide

11
6640-2205
Optical Power Budget
The allowed link length is calculated from the optical power budget (OPB), the available optical
power for a fibre-optic link, and the attenuation of the fibre, comprising losses due to in-line
connectors, splices, optical switches and a margin for link ageing (typical 1.5 dB for 1300 nm).
The worst-case optical power budget (OPB) in dB for a fibre-optic link is determined by the differ-
ence between the transmitter’s output optical power (min) and the receiver input sensitivity (max).
For other transceivers, contact Westermo
* Output power is power coupled into a 62.5/125 µm multimode fibre
** Output power is power coupled into a 9/125 µm singlemode fibre
*** Other distances are also available, please contact Westermo
FX 1Gbit (Fibre) SM-LC80 SM-LC50 SM-LC10 MM-LC2 MM-LC550
Connector LC LC LC LC LC
Distance km *** 80 50 10 2 0.5
Fibre type µm Singlemode
9/125
Singlemode
9/125
Singlemode
9/125
Multimode
62.5/125 and
50/125
Multimode
62.5/125
And50/125
Wavelength nm 1550 1550 1310 1310 850
Transmitter
Output optical
power min/max
dBm
–2 ** –4 ** –9.5 ** –9 * -9.5
Receiver
Input sensitivity,
max dBm
–24 –24 –20 –19 -18
Optical power
budget dB
22 20 10.5 10 8.5
Zero cable length No No Yes Ye s Ye s
Transceiver type LC Small Form Factor Pluggable (SFP)
Laser class Class 1, IEC 825-1 Accessible Emission Limit (AEL)
FX100 Mbit
(Fibre)
Bi-di
LC2
Bi-di
LC20
SM-
LC120
SM-
LC80
SM-
LC40
SM-
LC20
MM-
LC2
Connector LC LC LC LC LC LC LC
Distance km *** 2 20 120 80 40 20 2
Fibre type µm Multimode
62.5/125
and
50/125
Single-
mode
9/125
Singel-
mode
9/125
Single-
mode
9/125
Single-
mode
9/125
Single-
mode
9/125
Multi-
mode
62.5/125
and
50/125
Wavelength nm Connector 1 1550 1550 1310 1310 1310
Tx 1310
Rx 1550
Connector 2
Tx 1550
Rx 1310
Transmitter
Output optical power
min/max dBm
–10 * –14 ** 0 –5 ** –5 ** –15 ** –19 *
Receiver
Input sensitivity,
max dBm
–28 –32 -35 –34 –34 –34 –31
Optical power budget
dB
18 18 35 29 29 19 12
Zero cable length Yes Ye s No Yes Ye s Ye s Ye s
Transceiver type LC Small Form Factor Pluggable (SFP)
Laser class Class 1, IEC 825-1 Accessible Emission Limit (AEL)