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4 comments
Anonymous Poster #1

OTDR

10/05/2012 7:23 AM

Hi All

Asalam Alaikum

We have ongoing project in middle east, I need to carry out OTDR test for the F.O cable single mode but our OTDR machine is multi-mode can i use to do the test?

Thanks

Mohd

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Guru

Join Date: Oct 2007
Location: India
Posts: 1259
Good Answers: 33
#1

Re: OTDR

10/05/2012 7:56 AM

Read & go by the user manual.

Reply Score 1 for Off Topic
Participant

Join Date: Oct 2012
Posts: 1
#2

Re: OTDR

10/05/2012 11:46 PM

[1] Get the OTDR name, make and model number

[2] Google the [make & model] ops instructions

[3] still can come to CR4 page upon need of any help

Furqan Mohammad

---------------------------------------------------------------------------------- "Determine that nothing can and shall be done and then we shall find the way." BY Abraham Lincoln.

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Active Contributor

Join Date: May 2012
Posts: 11
#3

Re: OTDR

10/06/2012 12:58 AM

Yes.. Sure ..You can use the same machine...Procedure is same for both..only difference is in the loss calculations for(cable attenuation per Km(dB)..For 1310nm it is 0.38 and 1550 it is 0.25) ..that's all ..go ahead ..

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Participant

Join Date: Oct 2012
Posts: 2
#4

Re: OTDR

10/08/2012 9:22 AM

No, you cannot use a multimode otdr for singlemode testing. The results will be totally inaccurate. First of all, multimode fiber has a different core diameter; either 50um or 62.5 while singlemode fiber is 8 - 10um core. You probably won't even get a descent launch into the fiber. Additionally, the losses/kilometer and designed wavelengths are very different and so will be the index of refraction. All of this will provide no worthwhile information. Any splices, or other anomalies will show up at an erroneous distance if you get anything at all. If your OTDR is modular, you may be able to rent a singlemode module. It not, just rent a singlemode OTDR and get on with it.

PS: Be sure you get the right connector adapters as well.

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DonP (1); Furqan Mohammad (1); Joshi (1); Ramu1960 (1)

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