3-17
IM AQ6370D-01EN
Preparing for Measurement
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App
Index
Summary of usable optical fiber types and usage limitations
Optical Fiber Type Obtained Wavelength Absolute Level
Resolution (in nm) Accuracy
Type Core Diameter
SM 5 0.020 NG
SM 9.5 0.020 OK
GI 50 0.050 NG
GI 62.5 0.050 NG
SI 50 0.050 NG
SI 80 0.100 NG
SI 100 0.200 NG
SI 200 0.500 NG
SI 400 1.000 NG
SI 800 2.000 NG
Level Accuracy below the Cutoff Wavelength (Short Wavelength) of a
Connected Optical Fiber
With wavelengths at or below the cutoff level of the connected fiber, light propagates
through the optical fiber in multiple modes. When high-coherent light from a light source
such as a gas laser or DFB-LD light source propagates in multiple modes, speckle noise
contained in the optical fiber output light may become unstable by the optical fiber’s form,
resulting in an inaccurate measurement level.
In such cases, improving the coupling between the light source and the optical fiber will
lessen the level inaccuracy.
3.6 Alignment Adjustment
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