Stock Patch Cables Using This Fiber
Fiber Type	Connectors	Available Lengths	Patch Cable Item #
GIF625	FC/PC	1, 2, 3, 5, 10 m	M31Lxx

Graded-Index Multimode Optical Fiber

Thorlabs' graded-index fiber provides significantly less bend loss than traditional multimode fibers. Thorlabs offers a standard 62.5 μm / 125 μm Graded-Index Fiber (GIF625). GIF625 is offered pre-spooled in lengths of 10 m, 100 m or 1 km. In addition, Thorlabs now offers GIF50C, a Ø50 μm core graded-index fiber with a mechanically strippable acrylate coating (245 μm outer diameter). GIF50C supports serial transmission rates of 10 Gb/s over distances of 300 m in the 850 nm window.

Item #	GIF50C	GIF625
Operating Wavelength	750 - 1450 nm	800 - 1350 nm
Numerical Aperture	0.200 ± 0.015	0.275 ± 0.015
Core Diameter	50.0 ± 2.5 µm	62.5 ± 2.5 µm
Cladding Diameter	125 ± 1 µm	125 ± 1 µm
Coating Diameter	245 ± 5 µm	245 ± 10 µm
Core-Clad Offset	≤1.5 µm	≤8 µm
Core Doping	Germanium
Coating Material	Acrylate	Acrylate
Bandwidth	≥850 MHz•km @850 nm*	160 to 400 MHz•km @ 850 nm 300 to 1200 MHz•km @ 1300 nm
Attenuation	≤2.3 dB/km @ 850 nm 0.6 dB/km @ 1300 nm	2.7 to 3.2 dB/km @ 850 nm 0.6 to 0.9 dB/km @ 1300 nm
Effective Group Index of Refraction	1.480 @ 850 nm 1.479 @ 1300 nm	1.496 @ 850 nm 1.491 @ 1300 nm
Zero Dispersion Wavelength	1295 nm (Min) 1315 nm (Max)	1320 nm (Min) 1365 nm (Max)
Zero Dispersion Slope	≤0.101 ps/(nm²•km)	≤0.11 ps/(nm²•km)
Operating Temperature	-60 to +85 °C	-60 to +85 °C

*Laser Source (For LED sources at 850 nm the overfilled bandwidth is ≥1500 MHz•km while at 1300 nm the overfilled bandwidth is ≥500 MHz•km)

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Posted Comments:

Poster: bpursley

Posted Date: 2013-03-06 15:12:40.1

I currently have some gif625 and would like to use it at a wavelength of 2um if possible. Do you have attenuation data beyond 1600nm? Thanks

Poster: jlow

Posted Date: 2013-03-08 17:03:00.0

Response from Jeremy at Thorlabs: We do not have any test data at this moment for the attenuation of this fiber at 2µm. We have a theoretical estimate that the attenuation would be around 0.7 dB/km at 2µm.

Poster: tcohen

Posted Date: 2012-11-07 17:53:54.617

Response from Tim at Thorlabs: Thank you for your feedback. We currently have limited data in the visible for these fibers. To access this data and receive updates while we look to extend our curves, please contact us at techsupport@thorlabs.com.

Poster:

Posted Date: 2012-11-07 10:45:20.557

Can you add data for the attenuation across the visible, I have a number of wavelengths I'd like to transmit and can accept larger losses, but what to know approximately what to expect.

Poster: jlow

Posted Date: 2012-07-31 16:55:00.0

A response from Jeremy at Thorlabs: The typical pitch for the GIF625 fiber is around 0.986mm. The typical cladding/core(center) refractive index are about 1.45641/1.48585 (both at 656.20nm).

Poster: xie

Posted Date: 2012-07-31 12:08:06.0

Hi, I would like to know the pitch length (p) of GIF625 and the refractive index profiles of it. Thank you.

Poster: tcohen

Posted Date: 2012-06-21 15:29:00.0

Response from Tim at Thorlabs: Thank you for your interest in our graded index fibers! We are looking into the pitch for these fibers and have contacted you for more information on your application.

Poster: edouard.schmidtlin

Posted Date: 2012-06-18 17:25:07.0

Question about the grin media: What is the pitch, or the NR2 Zemax coeffifient?

Poster: tcohen

Posted Date: 2012-05-17 11:42:00.0

Response from Tim at Thorlabs: Thank you for your feedback! We have moved the effective group index of refraction into the main presentation and I have contacted you with data on the index profile.

Poster: jy_park

Posted Date: 2012-05-16 02:01:20.0

Hi, recently I bought a spool of GIF625 & GIF50C for my experiment, but I can't find any information of index profiles. Please offer this data. Thanks:)

Poster: jjurado

Posted Date: 2011-09-05 21:27:00.0

Response from Javier at Thorlabs to dirk.lorenser: We will send you the refractive index profiles for the GIF625 and GIF50C fibers shortly.

Poster: dirk.lorenser

Posted Date: 2011-09-01 22:15:52.0

Hi I have GIF50C as well as GIF625 in our lab and I would like to know the refractive index profiles. I also need to know the diameter of the inner cladding (normally this is visible in refractive index profiles). Thanks.

Poster: jjurado

Posted Date: 2011-07-06 09:41:00.0

Response from Javier at Thorlabs to avle: Thank you very much for contacting us! I will send you plots of the refractive index for these fibers shortly.

Poster: avle

Posted Date: 2011-07-05 19:17:53.0

Hi there, Do you have the refractive index profiles available for GIF 50 and GIF 625 optical fibers? Thanks!

Poster: jjurado

Posted Date: 2011-02-11 11:09:00.0

Response from Javier at Thorlabs to last poster: Thank you very much for your feedback. The GIF50 and GIF625 fibers are doped with germanium in the core. This dopant raises the refractive index of the glass, which inherently slows down the speed of light traveling through the fiber. Also, trace amounts of phosphorous dopant are used to facilitate the deposition process in manufacturing.

Poster:

Posted Date: 2011-02-08 10:44:47.0

Might be useful to spec the doping material used in this fiber.

Poster: klee

Posted Date: 2009-12-07 18:40:50.0

A response from Ken at Thorlabs to rajesh: The index profile was measured at 546nm. Unfortunately, the manufacturer cannot measure if at 488nm.

Poster: rajesh

Posted Date: 2009-12-02 07:55:02.0

The refractive index profiles are extremely useful. I have a couple of more questions regarding the refractive index profile of GIF625. Could you also mention the wavelength of light used for the measurement of the profile. I am interested to use the fibre at a wavelength of 488nm or close to 488nm. Could you kindly provide the index profiles at or close to 488nm. Regards, Rajesh

Poster: Tyler

Posted Date: 2009-01-26 08:20:29.0

A response from Tyler at Thorlabs to shalin: I forwarded your request to the technical support department last week. At which time, they informed me that your request was approved and that they would be contacting you for shipping information. I hope that these fiber samples help you in your research and if we can be of further assistance, please let us know.

Poster: shalin

Posted Date: 2009-01-21 04:11:50.0

Hello, I am from National University of Singapore. Could you please provide us a small length of GIF50 and GIF625 as a sample? Thanks, Shalin (Graduate Student, Optical Bioimaging Lab).

Poster: chenav

Posted Date: 2008-12-16 12:55:34.0

Hello, We are looking to purchase a spool of multi-mode, graded-index fiber for working at 532nm. We are especially interested in fibers with an allowed bending radius as low as possible. Please recommend which of your products would be best fit and add details on their bending radii. Regards, Chen Avinadav Rafael Ltd.

Poster: Laurie

Posted Date: 2008-09-17 14:07:23.0

Response from Laurie at Thorlabs to hclee2: Thank you for our interest in our graded-index fiber. Someone from our technical support staff with be contacting you shortly with the requested information. In addition, we will add to the web information concerning the index of refraction as a function of radial distance in the very near future.

Poster: hclee2

Posted Date: 2008-09-15 10:29:48.0

Hi, I am interesting if you could provide the approximate refractive index distribution between n1, ng and n2 versus cross section distance. This informaion would be helpful for running this GIF in the simulation model to determine the appropriate length. Therefore, if there is any advanced infomation, please email to me. Thanks

Poster: Laurie

Posted Date: 2008-07-09 08:55:22.0

Response from Laurie at Thorlabs to wblee21: The GIF625HT will not work for the 200 - 800 nm wavelength range, but we have a new fiber that will be available soon (HPSC10) that covers the wavelength range from 280 to 750 nm. Unlike the GIF625HT, this new fiber will be a step-index fiber instead of a graded-index fiber.

Poster: wblee21

Posted Date: 2008-07-09 03:20:49.0

Can I use this GIF625HT for 200nm - 800nm also even if you mention this product operating wavelength 800-1350nm

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Graded-Index Multimode Optical Fiber