Wavelength Division Multiplexed Arrays (WDM)
- For spectrometer, scanning laser, tunable filter or AWG interrogation systems
- Typically up to approx. 50 FBGs per array, depending on interrogation unit, bandwidth and required measurement range
- Each Fiber Bragg Grating with individual wavelength and reflectivity typically between 30% and 70%
- Narrow FBG spacing starting from 1mm possible
Time Division Multiplexed Arrays (TDM)
- For OTDR and OFDR interrogation systems
- Number of sensors typically in the range of several thousand FBGs per sensing cable
- Each FBG with similar wavelength and reflectivity typically between -45dB and -35dB
- Narrow FBG spacing starting from 1mm possible
