Fibre Optic Patch Cord Specification

By measuring the output of the source, then connect your patch cord and measure the other end using a light meter sensitive to the laser frequency. Compare the measured parameters.. Make sure no color, or light filtering is in place that will interfere or attenuate your signal.

Whatever resulting losses encountered will determine the quality of the fibers used inside the patch cord!

The loss per meter/foot or some length should be:

1. In the cable spec

2. Available on-line at supplier data.sheets

3. By measurement.

The loss through the cord isn't the problem. It's the loss at the connections that's the biggest worry. That can not be estimated. It must be measured.

What Lyn said

ILA = Insertion Loss Attenuation

RLA = Return (or Reflected) Loss Attenuation

I will hazard a guess that the fiber you have is duplex hence the numbers 1 and 2.

Insertion Loss is expressed in dB and is defined as 10*log (Po/Pi) where Po= Power Out and Pi=Power In.

I also will guess hope you can fill in the blanks so I don't completely do your work for you.

hellow daffy, your answer is really helpful for me. Can you shed some light about ILB & RLB.

I thought I did by telling you what the acronym is. Sorry but its too long to explain theory in a thread...I do work. Google may be your friend.

No disrespect intended but I got a smile when I saw that someone was using the Internet to get technical information from a character named Daffy Duck. The answer was good but overall it was funnier than most of the "caption this" postings we have had this year.

Da Da Da Dat's All Folks

power loss in dB =ILA1+patch cord length *loss dB/KM( from Fiber MFr Data i.e. dB/KM @ 1550nm) +ILA2

this gives you the attenuation loss of Patch Cord for particular length.

For design purposes, all Theoretical methods of finding losses will be only as good as the result obtained from the calculator. The results will be all estimations which are just good in papers..

For any actual and functional applications, One has to do an actual testing in order to validate any written specifications and/or compared to any pre-computed designed results.. Actual testings which are a must for all non-academic functions, and to come up with a more functional values validated for real world applications.

thanks for the advice... but can you just tell me what is meant by ILB and RLB.. that is what i am seeking for..

Study the field of communications, and its associated control circuits. Then focus on the medium you are interested in..

Good luck!