17
6650-2260
Optical Power Budget
The maximum supported link lengths as specified in the table above should only been seen as
indicative. 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 aging (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
difference between the minimum transmitter output optical power and the lowest receiver
sensitivity.
FX (Fibre)
SM-LC15
MM-LC2
Fibre connector
LC duplex
LC duplex
Fibre type
Singlemode
9/125 mm
Multimode,
62.5/125 and 50/125 mm
Wavelength nm
1310
1310
Transmitter
Output optical power min/max
–15/–8 dBm**
–20/–14 dBm*
Receiver
Input sensitivity, max
–31 dBm
–31 dBm
Receiver
Input optical power, max
–8 dBm
–8 dBm
Optical power budget,
worst-case
16 dB
11 dB
Transceiver type
Small Form Factor Pluggable (SFP)
Multi-Sourcing Agreement (MSA) compliant
Laser class
Class 1, IEC 825-1 Accessible Emission Limit (AEL)
FX (Fibre)
Bi-di
LC-20
Bi-di
MM LC-2
Fibre connector
LC Simplex
LC Simplex
Fibre type
Singlemode
9/125 µm
Multimode
62.5/125 and 50/125 µm
Wavelength nm, connector 1
Wavelength nm, connector 2
Tx1310, rx 1550 TX 1550,
rx 1310
Tx 1310, rx 1550 Tx 1550,
rx 1310
Transmitter
Output optical power min/max
-10/0 dBm **
–10/–8 dBm *
Receiver
Input sensitivity, max
–28 dBm
–28 dBm
Receiver
Input optical power, max
0 dBm
–0 dBm
Optical power budget,
worst-case
18 dB
18 dB
Transceiver type
Small Form Factor Pluggable (SFP)
Multi-Sourcing Agreement (MSA) compliant
Laser class
Class 1, IEC 825-1 Accessible Emission Limit (AEL)
*
Output power is power coupled into a 62.5/125
m
m multimode fibre
**
Output power is power coupled into a 9/125
m
m singlemode fibre
*** The optical power should be reduced by at least 5 dB (SM-LC80 and Bi-di LC-60)
or 3dB (SM-LC-40 and Bi-di LC-40) between the optical output and input.
