FC/APC Fiber Connector: Multimode, Ceramic Ferrule

  • Pre-Angled 8˚ Ceramic Ferrule
  • Improved Return Loss Compared to FC/PC Connectors
  • 2.0 mm Narrow Keys

FC/APC Connector Shown Assembled in a Cable


FC/APC with Ceramic Ferrule,
Pre-Angled 8˚

Related Items

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Recommended Fiber
Ø10 µm Core FG010LDA
Ø25 µm Core FG025LJA
Ø50 µm Core FG050UGA
Ø62.5 µm Core GIF625 Fiber Series
Ø105 µm Core FG105UCA


  • FC/APC Connectors with 2.0 mm Narrow Keys
  • 8° Pre-Angled Conical Ceramic Ferrules
  • Typical 10 dB Improvement in Return Loss for 0.22 and 0.275 NA Fibers Compared to FC/PC Connectors
  • Strain Relief Boot for Ø3.0 mm Tubing and Connector Cap Included
  • Additional Dust Caps can be Purchased Separately

Thorlabs' 30127A3 FC/APC Connector has a 2.0 mm narrow key and an 8° pre-angled ceramic ferrule. The connector package includes a fiber connector cap and a Ø3 mm green boot. Additionally, we offer stainless steel sleeves designed for mating connectors to our stainless steel tubing.

The 30127A3 is designed for multimode fibers with a cladding diameter of 125 µm and low numerical apertures (NAs), such as the ones listed in the Recommended Fiber table to the right. The 8° pre-angled ferrule reduces back reflections in low-NA fibers, which leads to an improvement in return loss. For example, for 0.22 and 0.275 NA fibers, those terminated with FC/APC connectors showed a typical return loss improvement of 10 dB for fiber-to-free-space compared to that measured with FC/PC connectors. Specifically, our FG050 (0.22 NA), FG105 (0.22 NA), and GIF625 (0.275 NA) have average decrease in return loss of 11.25 dB, 7.4 dB, and 10.3 dB, respectively. This improvement will be more pronounced for fibers with smaller NAs.

FC/APC connectors can only be mated to other FC/APC connectors. Thus, the 30127A3 provides a solution for connecting FC/APC-terminated components.

We do not currently offer green Ø2 mm strain relief boots. If you would like to use this connector with Ø2 mm furcation tubing, the black 190066CP boots sold on the Furcation Tubing, Sleeves, and Connector Caps page are compatible with the 30127A3.

If you need a different bore, please e-mail Tech Support for a quote on custom sizes.

As an alternative to buying and assembling separate optical fiber, connectors, and furcation tubing, Thorlabs also offers custom pre-built patch cables using the connectors sold on this page. See our Custom Fiber Patch Cable Configurator to place an order.

Posted Comments:
attachai Hewchaiyapoom  (posted 2022-09-02 13:17:24.917)
I want to buy 30128A3 - FC/APC Multimode Connector, Ø127 µm Bore, Ceramic Ferrule Please contact me back via email.
cdolbashian  (posted 2022-09-07 04:00:05.0)
Thank you for reaching out to us. I have contacted you via email, though for fastest purchasing turnaround, please reach out to our sales team: Sales@thorlabs.com.
Leo Wu  (posted 2021-07-01 18:37:34.36)
Hi, I'm Leo from Taiwan currently working in optical fiber filed, just want to know which type of SFP for this LC-LC APC MM. Please kindly feedback, thanks
YLohia  (posted 2021-07-01 02:21:42.0)
Hello Leo, thank you for contacting Thorlabs. Unfortunately, Thorlabs doesn't manufacture SFPs and we don't keep track of all the possible 3rd party SFPs compatible with our connectors. This would be something the end user would have to figure out themselves.
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FC/APC Fiber Connector: Multimode, Ceramic Ferrule

Item # Style Inner Diameter Diameter Tolerance Concentricity Ferrule Boot Included Crimp Tool
30127A3 FC/APC 127 µm +4/-0 µm 4 µm Ceramic,
Pre-Angled 8°
Ø3 mm CT042
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
30127A3 Support Documentation
30127A3FC/APC Multimode Connector, Ø127 µm Bore, Ceramic Ferrule
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Dust Caps

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

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
CAPF Support Documentation
CAPFClear Plastic Dust Caps for Ø2.5 mm Ferrules, 25 Pack