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Numerical Aperture of Optical Fiber
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Procedure for simulator

Controls 

Start button: To start the experiment.
Switch on: To switch on the Laser.

Select Fiber: To select the type of fiber used.

Select Laser: To select a different laser source.

Detector distance (Z): Use the slider to vary the distance between the source and detector. (ie toward the fiber or away from the fiber.

Detector distance(x): Use the slider to change the detector distance i.e towards left or right w.r.t the fiber.

Show Graph: To Displays the graph.

Reset: To resets the experimental arrangement.

 

Preliminary Adjustment

  • Drag and drop each apparatus in to the optical table as shown in the figure below. 

Fig (4)

  • Then Click “Start” button.
  • Switch On (now you can see a spot in the middle of the detector)
  • After that select the Fiber and Laser for performing the experiment from the control options.

 

To perform the experiment

  • Set the detector distance Z (say 4mm). We referred the distance as “d” in our calculation.  
  • Vary the detector distance X by an order of 0.5mm, using the screw gauge (use up and down arrow on the screw gauge to rotate it).
  • Measure the detector reading from output unit and tabulate it.
  • Plot the graph between X in x-axis and output reading in y-axis. See figure 5.
  • Find the radius of the spot r, which is corresponding to Imax/2.71 (See the figure 5).

Fig (5)

  • Then find the numerical aperture of the optic fiber using the equation (4).

Observation column 

SL No.

Screw gauge reading

Distance (X) mm

I µA

 

H.S.R

P.S.R

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Calculations

Distance between the fiber and the detector, d = …………………………… m

Radius of the spot, r =……………………….. m

Numerical Aperture of the optic fiber,  sin(θ) = \frac{r}{\sqrt{r^{2}+d^{2}}}= ..................

Acceptance angle, θ= {sin^{-1}}\left ( \frac{r}{\sqrt{r^2+d^2}} \right ) = ...........................

 

 

Result

Numerical aperture of the optic fiber is = …………………
Angle of acceptance = ……………….


 

 

Cite this Simulator:

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