FC/PC Fiber Connectors: Single Mode and Polarization-Maintaining

Screw-In Connectors
2.0 mm Narrow Keys
Spring-Loaded, Ceramic Ferrules
Maximum Concentricity of 1 µm

30126C3

FC/PC Connector Assembled
with Ø3 mm Tubing (Not Included)

Exploded View
of 30125D2

Boot for
Ø900 µm Tubing

Boot for
Ø3.0 mm Tubing

Crimp
Sleeve

Connector
Housing

Dust Caps and Strain Relief
Boots for Ø2 mm Tubing Can
be Purchased Separately

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Overview
Patch Cables
Feedback

Fiber Connector Selection Guide
Single Mode	Multimode
FC/PC FC/APC ST/PC LC/PC	FC/PC (SS Ferrule) FC/PC (Ceramic Ferrule) FC/APC SMA905 ST/PC
Bare Ferrules
Bare Fiber Terminator

Stock Patch Cables Available with Connectors Sold on This Page
Single Mode	Polarization-Maintaining
FC/PC Hybrid Connectors AR-Coated BS-Coated Mirror-Coated Low-Insertion-Loss	FC/PC Hybrid Connectors AR-Coated Mirror-Coated

Features

FC/PC Connectors with 2.0 mm Narrow Keys for Single Mode or Polarization-Maintaining Fiber
Screw-In Connector for High Stability
Pre-Radiused, Spring-Loaded, Ø2.5 mm, Ceramic Ferrule
Strain Relief Boot for Ø3.0 mm or Ø900 µm Tubing and Connector Cap Included

Threaded FC/PC connectors are designed for high-vibration environments. The "PC" stands for "physical contact" because these connectors allow the surfaces of two connected fibers to be in direct contact with each other. The FC/PC single mode connectors on this page feature a pre-radiused (20 mm) ceramic ferrule that minimizes back reflections. The ceramic ferrule is also spring-loaded to control the force on the fiber as the connector is screwed into its port.

For use with Polarization-Maintaining Fiber, we offer the 30125D2 FC/PC style connector. This connector's key is continuously adjustable, allowing precise alignment with the axis of the PM fiber. Once the key is aligned, it can be locked into place by adding a drop of superglue in the slot near the back of the connector.

Each 2.0 mm narrow key connector comes complete with a strain relief boot for either Ø3 mm or Ø900 µm tubing (both in the case of 30125D2) and a fiber connector cap. They also feature a hole size tolerance of +1 µm / -0 µm and a maximum concentricity of 1 µm.

As an alternative to assembling a patch cable using optical fiber, connector, and furcation tubing components, Thorlabs also offers pre-built patch cables from stock using the connectors sold on this page. See the table to the right and the Patch Cables tab for a listing of patch cables available that incorporate connectors sold on this page.

Fiber Type	Patch Cable Type	Connectors	Fiber Wavelength Range
Single Mode	Standard FC/PC	FC/PC to FC/PC	320 - 2100 nm^a
	Hybrid Connectors	FC/PC to FC/APC or FC/PC to SMA905	320 - 2100 nm^a
	AR-Coated	FC/PC to FC/PC, FC/PC to FC/APC, or FC/PC to FC/APC	320 - 2100 nm^a
	BS-Coated	FC/PC to FC/PC or FC/APC to FC/APC	1260 - 1620 nm
	Reflective-Coated	FC/PC or FC/APC	970 - 1620 nm^a
	Low Insertion Loss	FC/PC to FC/PC, FC/PC to FC/APC, or FC/APC to FC/APC	320 - 800 nm^a
Polarization-Maintaining Single Mode	Standard FC/PC	FC/PC to FC/PC	405 - 2000 nm^b
	Hybrid Connectors	FC/PC to FC/APC	405 - 2000 nm^b
	AR-Coated	FC/PC to FC/PC or FC/PC to FC/APC	620 - 1620 nm^b
	Reflective-Coated	FC/PC or FC/APC	970 - 1550 nm

This is the wavelength range covered by multiple fibers.
PM patch cables are aligned at discrete wavelengths in this range, based on the fiber type.

Stock Patch Cables Available with These Connectors

As an alternative to buying and assembling separate optical fiber, connectors, and furcation tubing, Thorlabs offers pre-built patch cables from stock using the connectors sold on this page. Stocked patch cables are available with single mode or polarization-maintaining single mode optical fiber, as indicated by the table to the right. Additionally, Thorlabs offers Custom Patch Cables with same-day shipping, which can be constructed using the connectors sold on this page.

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FC/PC Fiber Connectors: Single Mode and Polarization-Maintaining

Item #	Style	Bore	Concentricity	Ferrule	Included Boot(s)	Crimp Tool for Ø3.0 mm Tubing^a
30080D1	2.0 mm FC/PC Narrow Key	Ø80 +1/-0 µm	1 µm	Ø2.5 mm, Ceramic	Ø900 µm	Not Required
30125D2	2.0 mm FC/PC Narrow Key, Adjustable for PM Fiber	Ø125.5 +1/-0 µm	<1 µm	Ø2.5 mm, Ceramic	Ø900 µm and Ø3.0 mm	CT042
30126C3	2.0 mm FC/PC Narrow Key	Ø126 +1/-0 µm	1 µm	Ø2.5 mm, Ceramic	Ø3.0 mm	CT042
30126C9	2.0 mm FC/PC Narrow Key	Ø126 +1/-0 µm	1 µm	Ø2.5 mm, Ceramic	Ø900 µm	Not Required

A crimp tool is not required for Ø900 µm boots. For more details, please see our FN96A Connectorization Guide.

Strain Relief Boots and Dust Caps

Zoom

Strain Relief Boots and Crimp Sleeves for Ø2 mm Tubing (25 Pack)
CAPF Dust Cap for Ø2.5 mm Ferrules (25 Pack)
CAPFM Threaded Metal Dust Cap for FC Connectors (4 Pack)

Thorlabs offers strain relief boots and dust caps that can be purchased separately from our fiber connectors. The black strain relief boots sold here include a crimp sleeve and are compatible with FC/PC and FC/APC connectors and Ø2 mm furcation tubing (our stock connectors do not include a boot compatible with Ø2 mm tubing).

The CAPF Clear Plastic Dust Caps are for use with all Ø2.5 mm fiber connector ferrules and FC connectors, and the CAPFM Threaded Nickel-Plated Brass Dust Caps are for use with narrow-key FC connectors. Dirt on the fiber tip can result in permanent damage to the fiber connector, which can increase coupling losses or create undesirable mode structures in the output light. To prevent damaging the connectorized fiber, clean before each use with an appropriate fiber and connector cleaning product and use a fiber connector cap to protect the end face of the connectorized fiber when it is not in use.

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FC/PC Fiber Connectors: Single Mode and Polarization-Maintaining

Features

Stock Patch Cables Available with These Connectors

FC/PC Fiber Connectors: Single Mode and Polarization-Maintaining

Strain Relief Boots and Dust Caps