Fixed Fiber Optic Attenuators, Single Mode

Single Mode, Fixed Attenuators from 3 dB to 25 dB
Operating Wavelength Ranges from 1240 - 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

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OVERVIEW

Fiber Optic Attenuator Selection Guide
SM	Tabletop EVOAs with Power Lock
	Digital VOAs
	Electronic VOAs for System Integration
	Manually Variable Attenuators
	Fixed-Value Attenuators
PM	Digital VOAs
	Electronic VOAs for System Integration
	Manually Variable Attenuators
MM	Manually Variable Attenuators
MM	Fixed-Value Attenuators

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 1240 - 1620 nm.

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

Hide Fixed Fiber Optic Attenuators: FC/PC

Fixed Fiber Optic Attenuators: FC/PC

Item # (Click for Photo)	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^a	3 ± 0.5 dB	5 ± 0.5 dB	10 ± 0.7 dB	15 ± 1.0 dB	20 ± 1.0 dB	25 ± 1.3 dB
Operating Wavelength Range	1240 - 1620 nm
Attenuation Graph^b (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	≥40 dB
Maximum Input Power	1 W
Operating Temperature	-40 to 85 °C

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.

Part Number	Description	Price	Availability
FA03T	Fixed Fiber Optic Attenuator, 1240 - 1620 nm, 3 dB, FC/PC	$26.27	Today
FA05T	Fixed Fiber Optic Attenuator, 1240 - 1620 nm, 5 dB, FC/PC	$26.62	Today
FA10T	Fixed Fiber Optic Attenuator, 1240 - 1620 nm, 10 dB, FC/PC	$26.84	Today
FA15T	Fixed Fiber Optic Attenuator, 1240 - 1620 nm, 15 dB, FC/PC	$26.84	2 Weeks
FA20T	Fixed Fiber Optic Attenuator, 1240 - 1620 nm, 20 dB, FC/PC	$26.27	Today
FA25T	Fixed Fiber Optic Attenuator, 1240 - 1620 nm, 25 dB, FC/PC	$26.84	Today

Hide Fixed Fiber Optic Attenuators: FC/APC

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)
Attenuation^a,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 Graph^c (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
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.

Part Number	Description	Price	Availability
FA03T-APC	Fixed Fiber Optic Attenuator, 1240 - 1620 nm, 3 dB, FC/APC	$31.52	Today
FA05T-APC	Customer Inspired! Fixed Fiber Optic Attenuator, 1240 - 1620 nm, 5 dB, FC/APC	$31.52	Today
FA10T-APC	Customer Inspired! Fixed Fiber Optic Attenuator, 1240 - 1620 nm, 10 dB, FC/APC	$31.52	Today
FA15T-APC	Customer Inspired! Fixed Fiber Optic Attenuator, 1240 - 1620 nm, 15 dB, FC/APC	$31.52	Today
FA20T-APC	Fixed Fiber Optic Attenuator, 1240 - 1620 nm, 20 dB, FC/APC	$31.52	Today
FA25T-APC	Customer Inspired! Fixed Fiber Optic Attenuator, 1240 - 1620 nm, 25 dB, FC/APC	$31.52	Today

Hide Fixed Fiber Optic Attenuator and Terminator Kits

Fixed Fiber Optic Attenuator and Terminator Kits

FAK03 FC/PC Attenuator Kit		FAK05 FC/APC Attenuator Kit
Item	Qty.^a	Item	Qty.^a
Fixed Fiber Optic Attenuators^b		Fixed Fiber Optic Attenuators^b
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^c		Fiber Optic Terminator / Light Trap^c
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.

Part Number	Description	Price	Availability
FAK03	Fixed Fiber Optic Attenuator/Terminator Kit, FC/PC Connectors	$376.77	Today
FAK05	Fixed Fiber Optic Attenuator/Terminator Kit, FC/APC Connectors	$402.70	Today