- #1
ATH500
- 6
- 0
I did an experiment on the speed of light with different length of optical fibers.
I know that the fiber has a refraction index of 1.49.
I would like to know if I need to take in account the total internal reflection of the optical fibers too.
Because when I use long fibers like for exemple 50 meters or 20 meter, it shows value
inferior to the speed of light even after having multiplied the refraction index of 1.49.
I get 218x10^6 m/s or 198 x 10^6...
But when I use optical fiber of short length, for example when I compare the difference between a 10 meters optical fiber and a 0.60 meter one, I got a result that is almost the same as the speed of light: 291326041 meters/second.
I will post the results I got when doing the experiment with the optical fibers and the oscilloscope.
Here are four results for a length of 10 meters:
Here is the result for 20 meters:
For 50 meters:
For 0.60 meter:
For 0.615 meter:
I would like to know why do I get value of the speed of light that are inferior the more the length of the fiber increase.
Thank you,
Pascal
I know that the fiber has a refraction index of 1.49.
I would like to know if I need to take in account the total internal reflection of the optical fibers too.
Because when I use long fibers like for exemple 50 meters or 20 meter, it shows value
inferior to the speed of light even after having multiplied the refraction index of 1.49.
I get 218x10^6 m/s or 198 x 10^6...
But when I use optical fiber of short length, for example when I compare the difference between a 10 meters optical fiber and a 0.60 meter one, I got a result that is almost the same as the speed of light: 291326041 meters/second.
I will post the results I got when doing the experiment with the optical fibers and the oscilloscope.
Here are four results for a length of 10 meters:
Here is the result for 20 meters:
For 50 meters:
For 0.60 meter:
For 0.615 meter:
I would like to know why do I get value of the speed of light that are inferior the more the length of the fiber increase.
Thank you,
Pascal