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This Optical Fiber Identifier includes a carrying pouch containing three easy to use field interchangeable adapter heads to accommodate; 900 µm buffered fiber, ribbon or 250 µm coated fiber and 3mm jacketed fiber. Sold as pictured. This item requires one week lead time. Please allow for extra time when placing your order.

The Wilcom Model F6121A Basic Optical Fiber Identifier is a rugged, easy-to-use installation and maintenance instrument which identifies optical fibers by detecting the optical signals being transmitted through a fiber. By utilizing local detection technology (non-destructive macro-bend detection which does not damage or overstress the fiber), the unit eliminates the need to open the fiber at the splice point for identification; eliminating the probability of interrupting service.

The Optical Fiber Identifier detects low frequency tones at 270 Hz, 1000 Hz and 2000 Hz. When traffic is present on the fiber under test, an audible tone can be heard as well as the traffic direction which is indicated by LEDs illuminating on the probe.

During installations, maintenance, rerouting, or restorations it is often necessary to isolate a specific fiber without disrupting service. A light source such as Wilcom's Model FS1316 used in conjunction with the Optical Fiber Identifier can make the job a lot easier.


Detection Technique

Non-destructive macro-bending

Typical loss in dB

<0.6 db @1310 nm typical

Spectral Response

850 nm to 1700 nm

Detector Sensitivity (MDSP)*

-40 dBm typical (equivalent core power)

Optical Tone Receiver

270 Hz 1 kHz 2 kHz

Minimum Fiber Slack

0.75 inches required for detection

Warranty 1-Year Manufacturer Warranty, Wilcom

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Wilcom F6121A Advanced Hand-Held Optical Fiber Identifier w/ Tone

  • Item ID: 1676
  • Wilcom Inc.
  • Brand: Wilcom Inc.
  • Model: F6121A
  • Availability: 3-5 Days
  • Condition: New
  • $1,495.00

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Tags: Wilcom, F6121A, Advanced, Hand-Held, Optical, Fiber, Identifier, Tone, (OFI), Inc.