Skip to main content
光ファイバ心線対照器 FI720

Optical Fiber Identifiers

This product has been discontinued

The FI720, part of the FI700 Series of Optical Fiber Identifiers, is the safe, economical and non-destructive way to identify live optical fibers. These rugged units use local detection technology, which employs a macro-bend method, eliminating the need to open the fiber at the splice point for identification.

All models detect continuous wave, live optical transmission and low frequency modulated tones at 270, 1k, and 2k Hz. The presence of traffic, the direction of the transmission and modulated tones on the fiber are indicated by LEDs. In addition, the FI720 models measure the fiber's relative power and displays the reading on a two-digit, seven-segment LED. This allows for measurement of power loss through a splice or connector.

  • Provides safe, economical and non-destructive way to identify live optical fibers
  • Maximum range:
    • FI720: 0 to -40 dBm; &plusm; 2.0 dBm
    • FI720C: +20 to -20 dBm
  • Detection of modulated tones; 270 Hz, 1 kHz, 2 kHz
  • Single-hand operation
  • Light weight (7.5 oz.)
  • Interchangeable head for ribbon, jacketed and coated fiber allows virtually any fiber to be identified


Model FI710 FI720 FI720C
Insertion Loss
<0.5 dB
Spectral Response
800 to 1700nm
Optical Tone Receiver
270, 1 and 2 kHz
Maximum Range
0 to -40 dBm
0 to -40 dBm; ±2.0 dBm
+20 to -20 dBm
Relative Power
Fiber Stress
None; Macro-bending