Fibre optic brochure.pdf - Westermo - (Version JPG) - Page n° 19 - PDF Catalogue | Technical Documentation

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Optical Power Budget for the ODW-series

The maximum supported link lengths as specified in table below 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-LC80	SM-LC40	SM-LC15	MM-LC2
Fibre connector	LC duplex	LC duplex	LC duplex	LC duplex
Fibre type	Singlemode 9/125 um	Singlemode 9/125 um	Singlemode 9/125 um	Multimode, 62.5/125 and 50/125 um
Wavelength	1550 nm	1310 nm	1310 nm	1310 nm
Transmitter Output optical power min/max	-5/0 dBm**	-5/0 dBm**	-15/-8 dBm**	-20/-14 dBm*
Receiver Input sensitivity, max	-34 dBm	-34 dBm	-31 dBm	-31 dBm
Receiver Input optical power, max	-5 dBm***	-3 dBm***	-8 dBm	-8 dBm
Optical power budget, worst-case	29 dB	29 dB	16 dB	11 dB
Bit error rate (BER)	< 1 x 10^-10	< 1 x 10^-10	< 1 x 10^-10	< 2.5 x 10^-10
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 um multimode fibre ** Output power is power coupled into a 9/125 um singlemode fibre

*** The use of attenuation is recommended on short fibre lengths. 5dB (SM-LC80) and 3dB (SM-LC40)


Power budget for the LR-series
	Minimum budget
	Fibre	820 nm	Singlemode
	50/125	10.7 dB
	62,5/125	14.5 dB
jSffl ilFffl	100/140	20.6 dB
■j 1 ~~B \|J	9/125		6.3 dB
		Typical Budget
	50/125	16.6 dB
	62,5/125	18.6 dB
	100/140	25.9 dB
	9/125		12.3 dB

"Min. budget" states the minimum guaranteed power budget.

Experience shows however that the typical value is in the range of the indicated "Typ. budget".

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Fibre optic brochure.pdf - Westermo - #19

Industrial modem, Extender, Gateway, Converter, ADSL router