Fiber Characterization Laboratory
1.Fiber Attenuation Measurement
In this laboratory, attenuation and loss measurement of the fibers are performed. The attenuation measurement is done by Cutback Method. We use a x-y-z optical cage construction to coupling the light into the fiber. We use suitable wavelength diode lasers and optical equipment in the optical cage construction.
Fig. 1: Cage construction
We measure the power output of the fiber with Thorlabs PM-100 S145-C power meter.
Fig. 2: Cutback method
Equation 1: Attenuation of the fiber under test (dB/km)
2.Fiber Numerical Aperture Measurement
The Numerical Aperture (NA) of a fiber is a number that defines its light gathering capability.
Fig. 3: Numerical Aperture
We measure the Divergence Angle of the light from the fiber by Thorlabs BP 109-IR Beam Profiler.
Fig. 4: Numerical Aperture Measurement
Fig. 5: Thorlabs Beam Profiler