FC/APC Fiber Connectors: Single Mode
- Screw-In Connectors
- 8° Pre-Angled, Spring-Loaded, Ceramic Ferrules
- Typical 10 dB Improvement in Return Loss
Compared to FC/PC Connectors
- 2.0 mm Narrow Keys
FC/APC Connector Assembled
with Ø3 mm Tubing (Not Included)
Dust Caps and Strain Relief Boots
for Ø2 mm Tubing Can be
Ø900 µm Tubing
|Fiber Connector Selection Guide|
|FC/PC (SS Ferrule)
FC/PC (Ceramic Ferrule)
|Bare Fiber Terminator|
|Stock Patch Cables Available
with Connectors Sold on This Page
- FC/APC Connectors with 2.0 mm Narrow Keys
- Screw-In Connector for High Stability
- 8° Pre-Angled, Spring-Loaded, Ø2.5 mm, Ceramic Ferrules
- Strain Relief Boot for Ø3.0 mm or Ø900 µm Tubing and Connector Cap Included
Threaded FC/APC connectors are designed for high-vibration environments and minimal back reflections. The "APC" stands for "angled physical contact" because these connectors allow the surfaces of two connected fibers to be in direct contact with each other and because the fiber end is polished at an angle to prevent reflected light from traveling back up the fiber. These FC/APC connectors have an 8° pre-angled ceramic ferrule, which when properly polished, results in a typical return loss of 60 dB. Each connector package includes a fiber connector cap and plastic boot.
These connectors also feature a low 0.25 dB connector-to-connector typical loss. However, significant insertion loss can result when mating to different styles, and because of this, we recommend that FC/APC connectors be mated only with other FC/APC connectors. If your application requires that you switch connector types, we recommend using a hybrid patch cable.
As an alternative to buying and assembling separate optical fiber, connectors, and furcation tubing, 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/APC||FC/APC to FC/APC||320 - 2100 nma|
|Hybrid Connectors||FC/PC to FC/APC or|
FC/PC to SMA905
|320 - 2100 nma|
|AR-Coated||FC/PC to FC/PC,|
FC/APC to FC/APC, or
FC/PC to FC/APC
|320 - 2100 nma|
|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 nma|
|Low Insertion Loss||FC/PC to FC/PC,|
FC/PC to FC/APC, or
FC/APC to FC/APC
|320 - 800 nma|
|Standard FC/APC||FC/APC to FC/APC||405 - 2000 nmb|
|Hybrid Connectors||FC/PC to FC/APC||405 - 2000 nmb|
|AR-Coated||FC/PC to FC/PC or|
FC/PC to FC/APC
|620 - 1620 nmb|
|Reflective-Coated||FC/PC or FC/APC||970 - 1550 nm|
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.
bryden.quirk  (posted 2017-06-01 13:11:51.13)
Hi i,m having some trouble getting reliable connections with these connectors the insertion loss seems to increase significantly if the connector is screwed on too tightly or too loosely and is only acceptable with vary careful adjustment each time the connector is mated This seems to happen regardless of whether or not a radius is polished onto the ferrule I am visually inspecting the end face using an inspection scope and all-so using a Telesto OCT system to inspect for undercutting of the fiber. Do you have any suggestions ?
nbayconich  (posted 2017-06-14 09:48:21.0)
Thank you for contacting Thorlabs. It is possible that the key is misaligned between the connector and key slot. I will contact you directly about your application.
mjburek  (posted 2015-07-30 17:53:06.67)
Is it possible to buy the green or white fiber ferrule dust caps which are included with single mode fiber patch cords, instead of the clear plastic dust caps sold in packs of 25? Those which come with the single mode fibers have the molded attachment to the fiber, but these often break after extended us and we'd like to replace them.
besembeson  (posted 2015-09-24 09:34:23.0)
Response from Bweh at Thorlabs USA: Yes you can. I will follow-up with you.
|Item #||Style||Bore||Concentricity||Ferrule||Included Boot||Crimp Tool for
Ø3.0 mm Tubinga
|30080K2||2.0 mm FC/APC Narrow Key||Ø81 +2/-0 µm||1 µm||Ø2.5 mm, Ceramic||Ø900 µm||Not Required||-40 - 70 °C|
|30126A3||2.0 mm FC/APC Narrow Key||Ø126 +1/-0 µm||1 µm||Ø2.5 mm, Ceramic||Ø3.0 mm||CT042||-40 - 70 °C|
|30126A9||2.0 mm FC/APC Narrow Key||Ø126 +1/-0 µm||1 µm||Ø2.5 mm, Ceramic||Ø900 µm||Not Required||-40 - 70 °C|
- 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.