said by spectrumhead:
32 dbi loss was measured by the owner of the fiber pair recently. Actually the engineer told me that it is around -30 but it will be better for me to consider it like it is -32 for some reason i don't know.
The price I have got from a reseller is 1250$ per SFP. Is it too expensive or are there any cheaper options out there that I may consider ?
37 db is plenty of budget. I would be a lot more comfortable if they gave the specs for the SFP. If you look at the finisar site, you can see an example of what I am talking about for specs.
You could also get an amp use it. Something like this, »www.finisar.com/products/optical ··· cro-EDFA
, in their 1RU package. Then pair it up with a DWDM
sfp in you switches. This way if the SFP fails, you have a wide source to select from.
What wavelength did they shoot the fiber with, 1310 or 1550. If it was 1550, then that is not very good fiber or it has a lot of splices or connectors in the path.
When you look at optics you look at the Min TX launch power. That in combination with the min rx sensitivity gives you you link budget. The actual TX power of your SFP will be between the Min and Max value there is no guarentee as tothe actual launch power. It will probably be around+2 or +3, but you can't count on it.
JDSU also makes good stuff.