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EFI-50 Live Fiber Identifier

Live Fiber Detector

EFI-50 is a rugged, easy-to-use Live Fiber Detector that detects the presence of live signals on an optical fiber or optical fiber patch cord, without disconnecting the fiber network. The EFI-50 induces a safe macro-bend to allow a small amount of light to escape to detect the presence of network traffic, test tones or CW signals, without over stressing the fiber. In addition, the EFI-50 using a tone recognition feature which can locate specific dark fibers (at 270Hz/1kHz/2kHz)

EFI-50 is a multipurpose device that also includes an optical power meter and a visual fault locator built in.

The EFI-50 is a multi-purpose tool for the fiber technicians to perform trouble-shooting & repair management of a fiber network with mislabelled or unlabelled fibers, as a single man operation


  • Identify live fiber
  • Differentiate specific dark fiber using tone recognition
  • Built in Optical power meter: Measure optical power
  • Built in Visual fault locator: Identify fiber breaks
  • Can be used with a tone generator for fiber matching


Product Specification

Applicable Fibers

0.25/0.9/2.0/3.0mm fiber

Live Fiber Indication

Visual on TFT Color display & Buzzer sound

 Fiber Signal Direction

Visual indication on TFT Color display & Left-Right arrow indicator lights *applicable only for single mode fiber & for single direction signals

Tone Recognition

270Hz/1KHz/2KHz carrier signal

Calibration Function


Max. Input Power


Min. Sensitivity


Modulation Identification


Visual Fault Locator

1mW, with Glint function

Optical Power Meter

EFI-50T: -70~+6dBm EFI-50C: -50~+26dBm

Wavelength (nm)


Resolution/ Units

0.01dB/dB, dBm, μW

Reference Function


Wave ID Function

Yes, if used with corresponding laser source with Wave ID function


1.44-inch TFT screen, with brightness level control 1~10

Audio Feedback


Battery Type

AA/LR6 alkaline battery, battery level shown on display

Auto Power Off

Yes, settable 1~10 mins

Size (mm)

195 × 96 × 37

Weight (g)



  • Color TFT display
  • Live fiber identifier: Signal direction indication indicated on LCD Display & through left right arrow light. (*only for single mode fiber & for single direction signals
  • Universal adaptor: Use same adaptor for different fiber types &/or patchcords
  • Optical Power meter: 850nm/1300nm/1310nm/1490nm/1550nm/1625nm operating wavelengths with Wave ID function for circular
Frequently Asked Questions (5 answered questions)
Live Fiber Detector that detects the presence of live signals on an optical fiber or optical fiber patch cord, without disconnecting the fiber network

Person name: Asian

No. not required

Person name: Asian

Yes. Built in OPM & VFL

Person name: Asian

0.25/0.9/2.0/3.0mm fiber

Person name: Asian

Yes. It can detect modulation

Person name: Asian

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