I-MON 256 OEM Interrogatin monitor (1525 - 1570 nm)

The I-MON 256 OEM Interrogation Monitors offer real-time spectrum monitoring of FBG sensors in the 1550 nm wavelength range at line scan rates up to 35 kHz. A high spectrometer resolution combined with a broad wavelength range provides high-resolution interrogation monitors allowing measurement of a large number of FBG sensors.

A direct interface to the InGaAs detector offers OEM integrators a cost efficient solution for building their FBG sensing systems.


  • Vibration analysis
  • Temperature measurements
  • Pressure monitoring
  • Strain measurements
ParameterUnit I-MON 256 OEM
Maximum number of FBG sensors 37
Minimum FBG spacing pm / GHz1200 / 150
Wavelength rangenm1525 - 1570
Wavelength fit resolution(*) pm< 0.5
Repeatability (over any pol. state) pm3 (5 max)
Wavelength drift (**) pm / deg C 1 (3 max)
Power/Measurement dynamic range (*) dB 40/15
Input optical power range (*)dBm -70 to - 22
Measurement frequency (*) kHz 32.5 max.
Electrical interfaceDirect interface to InGaAs detector
Number of pixels256
Size (LxWxD) mm 21x50x66
Operating temperaturedeg C0 to 70

(*) Depending on customer electronics.

(**) Note that by applying temperature control or temperature correction, the wavelength accuracy over the entire wavelength range can be improved.

Download Product Sheets

Ibsen Product Sheets – I-MON OEM

A detailed Product Specification and User’s Manual are available upon request.


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