MultiMode Fiber Connectivity... (850nm) Power Question

Wed Feb 11 21:54:14 UTC 2015

Usually on Multi-mode and Low-power single-mode optics the MaxOutputOpticalPower is less than or equal to the  MaxInputOpticalPower, so it's not necessary to attenuate.  The trade-off is optimized optics versus having an attenuator sticking out the front of the electronics.

Something along the lines of -9.5 to -4 transmit power and  -18 to 0 on the Receive power.  Multi-Mode optics tend to be more application specific than single-mode  A good rule of thumb is keep a minimum of 4dB off the bottom plus 20% of the optical budget,  discounting any specific application the above optic would be optimal around -10dB.

Daniel Jameson
Manager - IP Network Engineering
TDS Telecom

-----Original Message-----
From: NANOG [mailto:nanog-bounces at nanog.org] On Behalf Of Faisal Imtiaz
Sent: Wednesday, February 11, 2015 2:48 PM
To: NANOG
Subject: MultiMode Fiber Connectivity... (850nm) Power Question

Hello,

I was looking for feedback on the following question:-

When connecting two MM SFP/SFP+/XFP 's together...(short range).

What should be the best practice receive power range ?

Is it true that if the rx power is higher than (x?) then it shortens the life of the optics ? 
(assumption being made here is that MAX Rx Power is not being exceed as per the spec sheets of the optics)

Regards

Faisal Imtiaz
Snappy Internet & Telecom
7266 SW 48 Street
Miami, FL 33155
Tel: 305 663 5518 x 232

Help-desk: (305)663-5518 Option 2 or Email: Support at Snappytelecom.net 