Author Topic: How go get single mode optic fiber to work  (Read 1131 times)

Offline TDAF

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How go get single mode optic fiber to work
« on: April 25, 2018, 04:27:52 PM »
I bought this cheap optic fiber cable off of eBay
I can't get this to transmit with any LED I use
What can I do about it
Except for buying a optic transmitter that is

Offline Max

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Re: How go get single mode optic fiber to work
« Reply #1 on: April 25, 2018, 05:24:15 PM »
Hello TDAF,


I tried something similar with my SC optic fiber cable. I took a 5mW green laser module to light into one side and thought, considering the brightness of the laser (on a white wall it‘s no more confortable to look at the dot), I should clearly see green on the other side. Actually I had to search for it, although I perfectly knew where it should be.
There was a green dot, but it was incredibly small and not bright at all; I had the impression, that it was the smallest point I could be able to make out.

So, where I want to get with this is
1) Although you‘re lighting up one side, you might not be able to see something on the other side
2) As the actual "conducting channel" is so small, there‘s not a lot of light going in. Therefore you need a very sensitive detector.


Kind regards,
Max

Offline TDAF

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Re: How go get single mode optic fiber to work
« Reply #2 on: April 25, 2018, 05:39:59 PM »
I have a detector ic
It's just the transmitter that''s the problem

Offline Hydron

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Re: How go get single mode optic fiber to work
« Reply #3 on: April 25, 2018, 05:54:03 PM »
Single mode receivers and transmitters are completely different to multi-mode ones. Make sure you have everything matched (Rx, Tx and fibre)!

Offline TDAF

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Re: How go get single mode optic fiber to work
« Reply #4 on: April 25, 2018, 06:15:05 PM »
Single mode receivers and transmitters are completely different to multi-mode ones. Make sure you have everything matched (Rx, Tx and fibre)!
The Rx is a HFBR-2412tz which to my knowledge is a single-mode receiver so, IM SAFE!!

Offline futurist

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Re: How go get single mode optic fiber to work
« Reply #5 on: April 25, 2018, 06:37:56 PM »
HFBR-2412tz is a multimode receiver!

I bought a similar cable on ebay and it ended up in the garbage

Offline TDAF

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Re: How go get single mode optic fiber to work
« Reply #6 on: April 25, 2018, 06:55:20 PM »
uhhhhh......
shit

Offline Hydron

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Re: How go get single mode optic fiber to work
« Reply #7 on: April 25, 2018, 08:28:19 PM »
Sorry, but I think you'll need to look at the HFBR datasheets, research and search further (multimode patch leads are cheap on ebay thankfully). There is also a colour code - wikipedia should help you with that. Avoid yellow!

Offline shrad

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Re: How go get single mode optic fiber to work
« Reply #8 on: June 19, 2019, 10:02:21 AM »
for all those wanting to transmit light using a fiber without emitter/receptor embedded in a connector (like with a bare laser) you have to use a fiber coupler (input and output) to focus the light into the fiber... and keep attention to numerical aperture and mode

might be useful for all those cables sitting in the bin

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Re: How go get single mode optic fiber to work
« Reply #8 on: June 19, 2019, 10:02:21 AM »

 


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