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Fixed Fiber Optic Attenuators, Single Mode


  • Single Mode, Fixed Attenuators from ≤1.0 dB to 25 dB
  • Operating Wavelength Ranges from 633 - 1620 nm
  • FC/PC or FC/APC Connectors

FAK05

Fiber Attenuator / Terminator Kit, FC/APC Connectors (Not to Scale)

FA03T

1240 - 1620 nm
3 dB Attenuation

FA25T-APC

1240 - 1620 nm
25 dB Attenuation

FA602

633 - 780 nm
≤2.0 dB Insertion Loss

Related Items


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Features

  • Attenuates Optical Signal
  • FC/PC or FC/APC Connectors
  • Kits Containing Six FC/PC or FC/APC Attenuators Available

Thorlabs' Single Mode Fixed Fiber Optic Attenuators allow one to attenuate an optical signal easily by plugging an FC/PC- or FC/APC-terminated fiber directly into the back end of the attenuator connector. The input of the attenuator has a 2.2 mm wide key female connector, making it compatible with both narrow key and wide key male connectors. The output of the attenuator has a 2.0 mm narrow key male connector (either FC/PC or FC/APC). These single mode attenuators are made with polarization-insensitive doped fiber to achieve the specified attenuation over operating wavelength ranges between 633 - 1620 nm for FC/PC versions and 1240 - 1620 nm for FC/APC versions.

The FA602 attenuator is ideal for use as a sacrificial interface. Its design does not introduce additional attenuation outside of insertion loss caused by intrinsic misalignment between fiber end faces. It can serve as connector savers that protect end faces of instruments from damage caused by repeated connections with fiber patch cables.

Every attenuator includes connector caps. For replacements, plastic FC connector and mating sleeve caps are available.


Posted Comments:
cbrideau  (posted 2015-02-19 18:12:15.143)
Any chance of getting these for 1040 or 1064nm, FC/PC? I have a fiber laser at 1040nm with diagnostic ports for coupling to a spectrometer, but the signal is a bit strong and I'd need to cut it back substantially.
jlow  (posted 2015-02-25 04:36:47.0)
Response from Jeremy at Thorlabs: We do not have these for lower wavelengths at the moment. For your application, would the VOA1064-FC (http://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=6161&pn=VOA1064-FC) work?
cbrideau  (posted 2014-02-12 11:15:43.03)
A version of this in SMA for multimode fibers would be useful for use with your fiber-coupled spectrometers. I often need to attenuate my signal before capturing it to avoid saturation of the CCD in the spectrometer. A drop-in attenuator like this would be very convenient for these measurements.
pbui  (posted 2014-02-27 04:33:11.0)
Thank you for your feedback. We will consider your suggestion for incorporating SMA fiber attenuators into our catalog in the future.
kirk.mckenzie  (posted 2014-02-04 14:45:08.917)
Can you make these product at 1064nm, APC?
pbui  (posted 2014-02-26 02:02:34.0)
Unfortunately, we are unable to offer custom fiber optic attenuators for 1064 nm.
lee.cairns  (posted 2013-11-04 14:56:09.277)
Hi, Do these attenuators also work at 1um? It would be useful to have lower denominations, for example, 1,2 and 3dB attenuators? Then it is possible to create a chain with an attenuation of arbitrary attenuation to the nearest dB. Regards, Lee
pbui  (posted 2013-11-06 02:01:22.0)
Response from Phong at Thorlabs: Our fiber optic attenuators use a short length of attenuating fiber which is only single-mode in the specified operating wavelength range. They can be used with shorter wavelengths, but the attenuation value will be different from the specified values, and the beam will no longer be single mode. Although it is possible to stack the attenuators to achieve various attenuation levels, please keep in mind that you will also have some insertion loss between each attenuator as well, so your overall attenuation will be higher than simply adding the attenuation specs together.
flint  (posted 2013-04-29 10:18:29.563)
What is attenuation at 2 microns? Is SMF-28 fiber being used? Thanks! John Flint Q-Peak, Inc.
tcohen  (posted 2013-05-15 12:13:00.0)
Response from Tim at Thorlabs to John: The FA10T uses doped attenuating fiber. The attenuation at 2050nm was measured to be 9.55dB.
tcohen  (posted 2012-02-24 14:25:00.0)
Response from Tim at Thorlabs: Thank you for your feedback. We are continuously expanding our catalog and broadening our selection of fixed optical attenuators is currently being discussed. I have posted your feedback for our design engineers to see.
user  (posted 2012-02-24 10:34:01.0)
How about fixed attenuators for all the other wavelengths Thorlabs is famous for supporting.
jjurado  (posted 2011-07-13 13:29:00.0)
Response from Javier at Thorlabs to sankar.ramasubramanian: We currently do not offer fixed connectorized attenuators for use with LC connectors. The only other options that we are able to offer are SC and ST. I will contact you directly to help you find a suitable alternative.
sankar.ramasubramanian  (posted 2011-07-13 04:19:22.0)
We are looking for fixed connectorized 10 dB attenuators with LC connectors. Please send us information if you have the same.
jjurado  (posted 2011-05-15 14:51:00.0)
Response from Javier at Thorlabs to last poster: The performance of these attenuators decays very rapidly if they are used outside of the specified bands. Please contact us at techsupport@thorlabs.com to discuss the details of your application, and we will gladly help you find a suitable attenuator.
user  (posted 2011-05-13 15:43:23.0)
Will the attenuator work for wavelength lower than the specifications?
Tyler  (posted 2009-01-08 16:57:51.0)
A response from Tyler at Thorlabs to mjcooper1: We can supply this part as a custom order with lead times as short as one day. I will have a member of our technical support department contact you so that they can generate a quote. Thank you for letting us know about your product needs. I will post that there is a need to add an FC/APC attenuator to our stocked items to our internal forum.
mjcooper1  (posted 2009-01-08 06:17:47.0)
I am suprised there are no fixed attenuators with FC/APC connectors, which is what I need
peter.rodrigo  (posted 2008-12-12 04:37:39.0)
Hi.Are all of these optical attenuators bidirectional, so that reflected light will experience the same degree of attenuation?-peter
g884513  (posted 2007-12-13 03:48:30.0)
Dear sir Is the VOA50-APC applicative to the attenuation of 980nm laser sources? sincerely Yeh

Fixed Fiber Optic Attenuators: FC/PC

Item # (Click for Photo) FA602a FA03T FA05T FA10T FA15T FA20T FA25T
Fiber Connector FC/PC
Key Size Universal (Female 2.2 mm Wide-Key Input, Male 2.0 mm Narrow-Key Output)
Attenuation ≤2.0 dB (Typ.)b 3 ± 0.05 dBc 5 ± 0.5 dBc 10 ± 0.7 dBc 15 ± 1.0 dBc 20 ± 1.0 dBc 25 ± 1.3 dBc
Operating Wavelength Range 633 - 780 nm 1240 - 1620 nm
Attenuation Graphd
(Click for Details)
Transmission ≥63.1% (Typ.) 50.1 ± 6.1% 31.6 ± 3.9% 10.0 ± 1.8% 3.2 ± 0.8% 1.0 ± 0.3% 0.32 ± 0.1%
Return Loss ≥40 dB
Maximum Input Power 300 mW 1 W
Polarization Dependent Loss (PDL) ≤0.1 dB
Operating Temperature -40 to 85 °C
  • The following fiber was used to obtain the specifications in this table; it was also used as the internal fiber: FA602: SM600
  • This attenuation is the result of insertion loss. This value was measured by using a detector in freespace, therefore additional losses can be expected if used as the intermediary element between two fiber-coupled components.
  • This attenuation does not include insertion loss. This value was measured by using a detector in freespace, therefore additional losses can be expected if used as the intermediary element between two fiber-coupled components.
  • The shaded region in these plots indicates the operating wavelength range that we specify for each attenuator. Performance outside of this range is not guaranteed.
Limited Stock Icon

The FA602 will be retired without replacement when stock is depleted. If you require this part for line production, please contact our OEM Team.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
FA602 Support Documentation
FA602Fiber Optic Sacrificial Interface / Attenuator, 633 - 780 nm, ≤2.0 dB, FC/PC
$48.80
Today
FA03T Support Documentation
FA03TFixed Fiber Optic Attenuator, 1240 - 1620 nm, 3 dB, FC/PC
$23.92
Today
FA05T Support Documentation
FA05TFixed Fiber Optic Attenuator, 1240 - 1620 nm, 5 dB, FC/PC
$24.25
Today
FA10T Support Documentation
FA10TFixed Fiber Optic Attenuator, 1240 - 1620 nm, 10 dB, FC/PC
$24.45
Today
FA15T Support Documentation
FA15TFixed Fiber Optic Attenuator, 1240 - 1620 nm, 15 dB, FC/PC
$24.45
Today
FA20T Support Documentation
FA20TFixed Fiber Optic Attenuator, 1240 - 1620 nm, 20 dB, FC/PC
$23.92
Today
FA25T Support Documentation
FA25TFixed Fiber Optic Attenuator, 1240 - 1620 nm, 25 dB, FC/PC
$24.45
Today

Fixed Fiber Optic Attenuators: FC/APC

Item # (Click for Photo) FA03T-APC FA05T-APC FA10T-APC FA15T-APC FA20T-APC FA25T-APC
Fiber Connector FC/APC
Key Size Universal (Female 2.2 mm Wide-Key Input, Male 2.0 mm Narrow-Key Output)
Attenuationa,b 3 ± 0.5 dB 5 ± 0.5 dB 10 ± 1.0 dB 15 ± 1.0 dB 20 ± 1.0 dB 25 ± 1.5 dB
Operating Wavelength Range 1240 - 1620 nm
Attenuation Graphc
(Click for Details)
Transmission 50.1 ± 6.1% 31.6 ± 3.9% 10.0 ± 2.6% 3.2 ± 0.8% 1.0 ± 0.3% 0.32 ± 0.13%
Return Loss >60 dB
Maximum Input Power 1 W
Polarization Dependent Loss (PDL) ≤0.1 dB
Operating Temperature -40 to 85 °C
  • The attenuation tolerance value takes into account alignment variability due to the universal key design. When mating connectors with different key sizes, the angled fiber tips may not come into full contact.
  • This measurement does not include insertion loss. This value was measured by using a detector in freespace, therefore additional losses can be expected if used as the intermediary element between two fiber-coupled components.
  • The shaded region in these plots indicates the operating wavelength range that we specify for each attenuator. Performance outside of this range is not guaranteed.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
FA03T-APC Support Documentation
FA03T-APCFixed Fiber Optic Attenuator, 1240 - 1620 nm, 3 dB, FC/APC
$28.71
Today
FA05T-APC Support Documentation
FA05T-APCCustomer Inspired! Fixed Fiber Optic Attenuator, 1240 - 1620 nm, 5 dB, FC/APC
$28.71
Today
FA10T-APC Support Documentation
FA10T-APCCustomer Inspired! Fixed Fiber Optic Attenuator, 1240 - 1620 nm, 10 dB, FC/APC
$28.71
Today
FA15T-APC Support Documentation
FA15T-APCCustomer Inspired! Fixed Fiber Optic Attenuator, 1240 - 1620 nm, 15 dB, FC/APC
$28.71
Today
FA20T-APC Support Documentation
FA20T-APCFixed Fiber Optic Attenuator, 1240 - 1620 nm, 20 dB, FC/APC
$28.71
Today
FA25T-APC Support Documentation
FA25T-APCCustomer Inspired! Fixed Fiber Optic Attenuator, 1240 - 1620 nm, 25 dB, FC/APC
$28.71
Today

Fixed Fiber Optic Attenuator and Terminator Kits

FAK03 FC/PC Attenuator KitFAK05 FC/APC Attenuator Kit
Item Qty.a Item Qty.a
Fixed Fiber Optic Attenuatorsb Fixed Fiber Optic Attenuatorsb
3 dB, FC/PC (FA03T) 1 3 dB, FC/APC (FA03T-APC) 1
5 dB, FC/PC (FA05T) 1 5 dB, FC/APC (FA05T-APC) 1
10 dB, FC/PC (FA10T) 1 10 dB, FC/APC (FA10T-APC) 1
15 dB, FC/PC (FA15T) 1 15 dB, FC/APC (FA15T-APC) 1
20 dB, FC/PC (FA20T) 1 20 dB, FC/APC (FA20T-APC) 1
25 dB, FC/PC (FA25T) 1 25 dB, FC/APC (FA25T-APC) 1
Fiber Optic Terminator / Light Trapc Fiber Optic Terminator / Light Trapc
FC/PC Connector (FTFC1) 5 FC/APC Connector (FTAPC1) 5
Dust Caps Dust Caps
Female, White 12 Female, Green 12
Male, Clear 25 Male, Green 25
  • Although these kits ship with the specified number of each component, the box is capable of accepting three additional attenuators per compartment and five additional terminators.
  • Please see the tables above for a complete list of specifications for our fiber attenuators.
  • Please click here for a complete list of specifications for our fiber terminators.
  • Six Fixed Fiber Optic Attenuators for 1240 - 1620 nm with Attenuation Values Ranging from 3 to 25 dB
  • Five Fiber Optic Terminators / Light Traps for Use in the 400 - 2100 nm Wavelength Range
  • Additional 12 Female and 25 Male Dust Caps Included for Convenience
  • Versions Available with FC/PC or FC/APC Connectors
  • Packaged in a Compact Plastic Box with Nine Individual Compartments

Thorlabs' Fiber Optic Attenuator and Terminator Kits each contain six fixed attenuators, five terminators, and a selection of dust caps. Components in the FAK03 kit have FC/PC connectors while those in the FAK05 kit have FC/APC connectors. Each kit is packaged in a plastic box measuring 7.0" x 3.5" x 1.25" (177.8 mm x 88.9 mm x 31.8 mm) and has nine labeled compartments. The label on the lid indicates the contents, associated Thorlabs item number (where applicable), attenuation value and tolerance for the attenuators, and wavelength range and return loss for the terminators. The table to the right lists the description and quantity of each item included in these kits.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
FAK03 Support Documentation
FAK03Fixed Fiber Optic Attenuator/Terminator Kit, FC/PC Connectors
$343.21
Today
FAK05 Support Documentation
FAK05Fixed Fiber Optic Attenuator/Terminator Kit, FC/APC Connectors
$366.83
Today
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