Fixed Fiber Optic Attenuator and Terminator Kits


  • Six Attenuators and Five Terminators Contained in Each Kit
  • FC/PC and FC/APC Versions Available
  • Male and Female Dust Caps Included

FTFC1

FC/PC Terminator

FAK03

FC/PC Attenuator
and Terminator Kit (Not to Scale)

FA03T

FC/PC Attenuator

FTAPC1

FC/APC Terminator

FA25T-APC

FC/APC Attenuator

FAK05

FC/APC Attenuator
and Terminator Kit
(Not to Scale)

Related Items


Please Wait
FAK03 FC/PC Attenuator Kit FAK05 FC/APC Attenuator Kit
Item Quantitya Item Quantitya
Fixed Fiber Optic Attenuators Fixed Fiber Optic Attenuators
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 Trap Fiber Optic Terminator / Light Trap
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.

Features

  • Kit Contents
  • Kits 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. All components are packaged in a plastic box that measures 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 within each kit. Please see the Specs tab for a complete list of specifications for all kit components.

Attenuators
The Fixed Fiber Optic Attenuators included in these kits 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. These single mode attenuators are made with polarization-insensitive doped fiber to achieve the specified attenuation over the operating wavelength range (1240 - 1620 nm).

Terminators / Light Traps
The Fiber Terminators / Light Traps included in these kits are designed to be used with ports that do not have an output fiber connected to them. Terminating connectors reduce back reflections into the input fiber by at least 50 dB by coupling emitted light into FG025LJA fiber and then diffusing the light within the terminator. In contrast, typical back reflections from an unused port can be as poor as 20 dB. Our terminators are for use with light from 400 - 2100 nm and have male, FC/PC or FC/APC 2.0 mm, narrow key connectors.

FAK03 Kit Specifications

Terminator Item # FTFC1
Return Loss  ≥50 dB
Wavelength Range 400 - 2100 nm
Input Power (Max) 300 mW at
1550 nm, CW
Fiber Type FG025LJA
Connector Type FC/PC
Attenuator Item # 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)
Operating Wavelength Range 1240 - 1620 nm
Attenuation 3 ± 0.5 dB 5 ± 0.5 dB 10 ± 0.7 dB 15 ± 1.0 dB 20 ± 1.0 dB 25 ± 1.3 dB
Attenuation Grapha
(Click for Details)
Transmission 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 >50 dB
Maximum Input Power 1 W
Polarization Dependent Loss (PDL) ≤0.1 dB
Operating Temperature -40 to 85 °C
  • 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.

FAK05 Kit Specifications

Terminator Item # FTAPC1
Return Loss  ≥50 dB
Wavelength Range 400 - 2100 nm
Input Power (Max) 300 mW at
1550 nm, CW
Fiber Type FG025LJA
Connector Type FC/APC
Attenuator Item # 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)
Operating Wavelength Range 1240 - 1620 nm
Attenuationa 3 ± 0.5 dB 5 ± 0.5 dB 10 ± 1.0 dB 15 ± 1.0 dB 20 ± 1.0 dB 25 ± 1.5 dB
Attenuation Graphb
(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.
  • 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.

Posted Comments:
Stijn Mast  (posted 2024-02-20 07:49:54.953)
Dear, The description mentions that the product uses 'polarization-insensitive doped fiber'. Does this mean that polarization of the input signal is maintained at the output of the attenuator? Kind regards, Stijn Mast
jpolaris  (posted 2024-02-22 07:45:50.0)
Thank you for contacting Thorlabs. "Polarization insensitive" in this context means that the attenuation is not going to be dependent on the input polarization state of the light. These attenuators do not use polarization maintaining fiber, so the polarization extinction ratio will be negatively impacted by the attenuator. We do not have an estimate for how much the polarization state would change. Polarization can be maintained in standard non-polarization maintaining fiber over short distances. There is a small amount of non-polarization maintaining fiber within these attenuators, so I would not expect the polarization extinction ratio to be too severely negatively impacted. However, there is no consideration to polarization state with key-alignment. Meaning, the key of the attenuator will not be aligned to any particular orientation because there are no stress rods inside the attenuator.
Back to Top

Fixed Fiber Optic Attenuator and Terminator 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
$376.77
Today
FAK05 Support Documentation
FAK05Fixed Fiber Optic Attenuator/Terminator Kit, FC/APC Connectors
$402.70
Today