# fibre optic problem

Discussion in 'General Electronics Chat' started by mik3, Apr 17, 2008.

1. ### mik3 Thread Starter Senior Member

Feb 4, 2008
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hi guys, i have a problem for you.

An optical fibre has core refractive index n1=1.5 and cladding refractive index of n2=1.45. Estimate the maximum signaling rate attainable if the optical fibre has a length of 10Km.

Can you solve it for me? In my opinion you cant solve it because you dont know the diameter of the core of the fibre, what do you think?

2. ### thingmaker3 Retired Moderator

May 16, 2005
5,073
8
Ten clicks suggest single-mode fiber. Assume either 8.5 or 9 micron.

3. ### mik3 Thread Starter Senior Member

Feb 4, 2008
4,846
70
Thanks for the reply but i want to ask if you can calculate the signaling rate of an optical fibre without knowing its core diameter, do you?

4. ### kkm557 New Member

Apr 19, 2008
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If you assume it is a single-mode fiber, there are equations that you can use to estimate "d" as thingmaker3 has. The way I would do it would be to find an approximate V number.

5. ### mik3 Thread Starter Senior Member

Feb 4, 2008
4,846
70
Ok but can you calculate the signaling rate without knowing the diameter of the core?

6. ### thingmaker3 Retired Moderator

May 16, 2005
5,073
8
Someone else might be able to, but I sure can't.

7. ### mik3 Thread Starter Senior Member

Feb 4, 2008
4,846
70
i think its impossible to do it. You have to know the diameter of the core.