Determining "receive" side of optic SFP

[darren.g]

Hi.

I have an implementation coming up of dark fibre which requires me to run ZX SFP's (cable distance more than 10 k's), but I need to put an attenuator into the receiving side of the SFP at each end.

How do I figure out which one is the receiver?

With the 1350nm SFP, there's no "light" to see the output and figure which is the transmitter like there is on 850nm SFP's - so how do I do it for the longer wavelength ones?

I've only been able to find a disgrametic representation of a CWDM SFP which indicates a specific side - is it safe to assume a standard, non WDM SFP is the same?

Or do I plug it in with the attenuator in one side, check the power input, then plug it in the other side and see if it makes a diference?

Thanks.

[Leo Laohoo · Accepted solution]

Look at Figure 1.

Cisco SFP and SFP+ Transceiver Module Installation Notes

[darren.g]

leolaohoo wrote:
Look at Figure 1.
Cisco SFP and SFP+ Transceiver Module Installation Notes

Yet again, your awesomness is legendary, Leo.

Try as I might, I couldn't find that document. Now I have it bookmarked.

Thanks mate!

[Leo Laohoo]

No problem Darren.  Glad to be of some assistance.

[Sebastian Kricner]

Also, it just would be possible to use a camera without IR-filters, to detect the light. Best would be a thermographic camera.