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Old 12-12-2014, 06:20 AM #1
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Default Re-terminating fibre optic cable.

Is this doable?

I have a cable that cannot be detached at the source end, but the output end is unterminated. I can't seem to even get a clean break on the fibre, which I gather is a precursor to even thinking about termination.

Any thoughts?


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Old 12-12-2014, 01:16 PM #2
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Default Re: Re-terminating fibre optic cable.

Doable, yes. But, if you dont have the specific tools for the job, it will be a royal PITA (getting a clean, even surface on it). I would contact Dr. G, he would probably be your best bet. I am assuming this is for your fiber coupled diode you snagged?
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Old 12-12-2014, 02:25 PM #3
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Default Re: Re-terminating fibre optic cable.

Quote:
Originally Posted by crazyspaz View Post
Doable, yes. But, if you dont have the specific tools for the job, it will be a royal PITA (getting a clean, even surface on it). I would contact Dr. G, he would probably be your best bet. I am assuming this is for your fiber coupled diode you snagged?
Yep it is. Not sure who Dr. G is though. The problem, is that if the cut isn't perfect, with 12W travelling through the fibre, any imperfection causes the tip of the fibre to burst into flames.

I managed to get a fairly clean cut using a traditional razor blade, believe it or not. I used a sort of "cut and snap" approach. It seems to be workable now. Of course I still need to figure out how to terminate this into some sort of connector, ideally without having to drop money on crimpers (that are probably 5x more expensive than they should be, on account of their narrow application).

Fibre seems to make this "linear array" look single mode. Is that normal?

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Old 12-12-2014, 02:45 PM #4
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Default Re: Re-terminating fibre optic cable.

Dr. G= Sam Goldwasser, of Sam's laser FAQ.
Is the whole thing rated at 12W, or is it rated 12W out of the fiber?
Have you checked thorlabs? They have everything you need, from cleaving tools to connectors. Not terribly expensive, either. You will get a single mode-ish looking output out of the fiber. The point of fiber coupling those arrays is to get a usable output from them. A 40W IR flashlight doesn't do anyone any good
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Old 12-12-2014, 02:54 PM #5
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Default Re: Re-terminating fibre optic cable.

Quote:
Originally Posted by crazyspaz View Post
Dr. G= Sam Goldwasser, of Sam's laser FAQ.
Is the whole thing rated at 12W, or is it rated 12W out of the fiber?
Have you checked thorlabs? They have everything you need, from cleaving tools to connectors. Not terribly expensive, either. You will get a single mode-ish looking output out of the fiber. The point of fiber coupling those arrays is to get a usable output from them. A 40W IR flashlight doesn't do anyone any good
Regardless of what it's rated (which I'm not clear on), I get 10+ Watts out of the fibre on my Ophir (which now maxes out at 10W), so I'm fine with that.

I've never known thorlabs not to be expensive. Frankly, there's a matter of perspective here, and I recognize that fibre coupled diodes are in the realm where that relativity gradient gets pushed upwards. But I don't have the budget (or desire) to go spend $50 on fibre splicing / terminating equipment.

My ultimate goal is to modify the laser engraver I purchased to use the fibre output, so I'd like to not spend a ton of money terminating the fibre. IE, I would like to spend almost nothing

I'm not demanding, am I? lol
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Old 12-12-2014, 07:16 PM #6
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Default Re: Re-terminating fibre optic cable.

I had to re do my 1.3W diodes that had damaged fibres .

I used a craft knife to introduce a defect and then pulled on the fibre before and after the defect till it broke in two , it gave a good results .

I did try " bend and snap " but gave lesser results .
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Old 12-12-2014, 08:26 PM #7
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Default Re: Re-terminating fibre optic cable.

What is a diameter of the fiber?

Try to fix a fiber at ~10 cm at the end you want to cleave/cut. A tape can be sufficient to hold. Then pull that end and make a slight cut though don't crush through. If done properly it cleaves well though not perfect.

As for termination. Do you have a connector? Could you use this Thorlabs - BFTU Universal Bare Fiber Terminator or an analog.

Otherwise post pics.
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Old 12-12-2014, 10:17 PM #8
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Default Re: Re-terminating fibre optic cable.

Quote:
Originally Posted by lazeristasUVISIR View Post
What is a diameter of the fiber?

Try to fix a fiber at ~10 cm at the end you want to cleave/cut. A tape can be sufficient to hold. Then pull that end and make a slight cut though don't crush through. If done properly it cleaves well though not perfect.

As for termination. Do you have a connector? Could you use this Thorlabs - BFTU Universal Bare Fiber Terminator or an analog.

Otherwise post pics.
What do you want to see pics of?

At this stage, it's just a 3mm bare fibre.

No, can't use the Thor labs part. It costs $75. My budget is more like 5

I bought one of these:
ST Multimode Metal Housing 3 0 MM Fiber Optic Connector | eBay

Any reason I can't add this to the fibre?
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Old 12-13-2014, 01:28 AM #9
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Default Re: Re-terminating fibre optic cable.

Depending on the fiber material and application some fibers are actually cleaved and then polished with special compounds to achieve a particular surface finish.

I've only had to terminate data level FO systems where it wasn't critical, but I'd always used a new razor blade while putting mild tension on the fiber cable to ensure a clean cut and not a crushing cut.
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Old 12-14-2014, 11:05 PM #10
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Default Re: Re-terminating fibre optic cable.

Yeah it's usually polished at the end of a very special machine. If you want to terminate it in your house you can buy a special cutter for it depending on the type of fiber, but they're not cheap. If you know any computer technicians, they might loan you one. I think Thorlabs also sells them but I'd have to check. I find thorlabs is usually the best place to get tools for relatively inexpensive way compared to a lot of other lab sellers (Newport I'm talking to you) how thick of a fiber we talking about?

Edit: ah missed the size bit. 3mm is pretty big indeed. But anyway yes you can put one of those tips on the end probably, but you'll still end up needing the cutters to get full transmission. Good fiber is expensive. Just the way it is
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Old 12-15-2014, 04:20 AM #11
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Default Re: Re-terminating fibre optic cable.

Quote:
Originally Posted by ultimatekaiser View Post
Yeah it's usually polished at the end of a very special machine. If you want to terminate it in your house you can buy a special cutter for it depending on the type of fiber, but they're not cheap. If you know any computer technicians, they might loan you one. I think Thorlabs also sells them but I'd have to check. I find thorlabs is usually the best place to get tools for relatively inexpensive way compared to a lot of other lab sellers (Newport I'm talking to you) how thick of a fiber we talking about?

Edit: ah missed the size bit. 3mm is pretty big indeed. But anyway yes you can put one of those tips on the end probably, but you'll still end up needing the cutters to get full transmission. Good fiber is expensive. Just the way it is
I have had fairly good luck using a razor, but it's not perfect, and every once in a while the end of the fibre bursts into flames (so I guess that's far from perfect).

I ordered some 5,000 grit sandpaper. I know that's a long shot. But bottom line here is that it's not worth buying a tool to repair the fibre that costs more than the diode, so I need to find a way to do this on the cheap. I actually have faith that I'll figure something out. I'm so close.
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Old 12-15-2014, 04:26 AM #12
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Default Re: Re-terminating fibre optic cable.

RHD, try hitting up a cabling contractor in your area. You should be able to get one termination for really cheap...especially if you take the fiber to them.

-G
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Old 12-15-2014, 05:36 AM #13
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Default Re: Re-terminating fibre optic cable.

Yeah borrowing is an option. Or try a fine polish on a thick paper. Ceramic polish is super fine. Around half a micron. Might be able to use that
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532nm: CNI MGL-F-3W, Coherent Genesis MX Taipan OPSL, LG Hercules-325
543.5nm: 05-LGR-193 Melles Griot HeNe 3.8mW
Melles Griot LGB-563 HeNe

561nm: Melles Griot 85-YCA-015, Coherent Sapphire 561-20
568nm: Omni-643RYB Whitelight Line

577nm: Coherent Genesis MX Taipan OPSL
583.8nm: DPSS line
586.2nm: DPSS line
588.6nm: CNI PGL-M-80

591nm: DPSS line
593.5nm CNI MGL-H-50 Lab Laser
594.1nm: Coherent 31-2230-000 (4.5mW)

604.6nm: LOR-150 HeNe line
609nm: Raman HeNe line?
611.8nm: Melles Griot LOR-150 HeNe (5mW), LOR-006 HeNe (0.5mW)

632.8nm: Spectra Physics Model-127 (>35mW), Model-124B, Model-120, Model-117, others
Melles Griot LHB-580, LHB-190, WHR-570

641nm: Melles Griot RCS
647nm: Omni-643RYB Whitelight Line
659.6nm: Laser Quantum IGNIS DPSS laser 0.5W

671nm: CNI PGL-III-C-100
676nm: Omni-643RYB Whitelight Line
690nm: custom diode laser
694nm: Portable Q-switched Ruby Laser

1152.6nm: SP-120 HeNe alt. mirrors
1523.5nm: Melles Griot LIR-151 HeNe
3391nm: SP-124 alt. mirrors
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Old 12-15-2014, 06:42 AM #14
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Default Re: Re-terminating fibre optic cable.

Quote:
Originally Posted by ultimatekaiser View Post
Yeah borrowing is an option. Or try a fine polish on a thick paper. Ceramic polish is super fine. Around half a micron. Might be able to use that
Okay. What do you mean by thick paper?
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Old 12-15-2014, 07:22 AM #15
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Default Re: Re-terminating fibre optic cable.

Quote:
Originally Posted by rhd View Post
Okay. What do you mean by thick paper?
similar to the kind of stuff sandpaper comes on, or if you have a fine grit stone you could use that for polishing. I actually have a waterstone that is 120000 grit ceramic. you could use the slurry from something similar to polish it I imagine. perhaps pour some jeweler's rouge or something similar onto a sandpaper back somehow and use it to grind down the tip? I assume it'd be hard enough to polish glass? A high pressure very sharp cutting tool might work too.
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325nm: Omni 2056-M-A01 HeCd
375nm: Melles Griot RCS-007

405nm: Melles Griot RCS
430nm: Coherent D3 430-10
441.6nm: Omnichrome 2056-M-A01/4074-P-A03 HeCd laser
457.9nm: Argon Ion Line

472nm Omni-643RYB Whitelight Line
473nm: CNI MGL-473-100, CNI GLP-473
476.5nm: Argon Ion Line

483nm Omni-643RYB Whitelight Line
488nm: Argon Ion Line, Spectra Physics >20mW Cyan DECSL Laser, Coherent Sapphire 488-20 OPSL

496.5nm: Argon Ion Line
501.7: Argon Ion Line
514.5nm: Argon Ion Line
520nm: Trustfire A8 Custom

532nm: CNI MGL-F-3W, Coherent Genesis MX Taipan OPSL, LG Hercules-325
543.5nm: 05-LGR-193 Melles Griot HeNe 3.8mW
Melles Griot LGB-563 HeNe

561nm: Melles Griot 85-YCA-015, Coherent Sapphire 561-20
568nm: Omni-643RYB Whitelight Line

577nm: Coherent Genesis MX Taipan OPSL
583.8nm: DPSS line
586.2nm: DPSS line
588.6nm: CNI PGL-M-80

591nm: DPSS line
593.5nm CNI MGL-H-50 Lab Laser
594.1nm: Coherent 31-2230-000 (4.5mW)

604.6nm: LOR-150 HeNe line
609nm: Raman HeNe line?
611.8nm: Melles Griot LOR-150 HeNe (5mW), LOR-006 HeNe (0.5mW)

632.8nm: Spectra Physics Model-127 (>35mW), Model-124B, Model-120, Model-117, others
Melles Griot LHB-580, LHB-190, WHR-570

641nm: Melles Griot RCS
647nm: Omni-643RYB Whitelight Line
659.6nm: Laser Quantum IGNIS DPSS laser 0.5W

671nm: CNI PGL-III-C-100
676nm: Omni-643RYB Whitelight Line
690nm: custom diode laser
694nm: Portable Q-switched Ruby Laser

1152.6nm: SP-120 HeNe alt. mirrors
1523.5nm: Melles Griot LIR-151 HeNe
3391nm: SP-124 alt. mirrors

Last edited by ultimatekaiser; 12-15-2014 at 07:23 AM.
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Old 12-16-2014, 06:46 PM #16
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Default Re: Re-terminating fibre optic cable.

Quote:
Originally Posted by rhd View Post
What do you want to see pics of?

At this stage, it's just a 3mm bare fibre.

No, can't use the Thor labs part. It costs $75. My budget is more like 5

I bought one of these:
ST Multimode Metal Housing 3 0 MM Fiber Optic Connector | eBay

Any reason I can't add this to the fibre?
Pics - to understand what you do.

The datasheet (if it is for your model) says a connector is SMA 905. You bought ST. That is not a problem. What about the hole size? 3 mm is for boot. Does your fiber pass through the hole when cleaved and stripped?

As I understand you are doing some burning ("modify the laser engraver "). Can it be that your fiber end gets contaminated by fumes and then starts a fire? BTW, what burns?
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