Chp 18 - History Of Fiber Optics

Question 0

Air has a approximate refractive index of?

Answer 0

1

Question 1

What were some of the first human efforts to communicate with light?

Answer 1

Signal fires, light houses

Question 2

Water has an approximate refractive index of?

Answer 2

1.33

Question 3

What breakthrough happened in 1840?

Answer 3

Colladon and Babinet demonstrated that bright light could be guided through jets of water through the principle of total internal reflection

Question 4

Who performed the demonstration before the British Royal Society and made it part of his published work in 1871?

Answer 4

John Tyndall

Question 5

What year did Alex Graham Bell demonstrate his photophone one of the first true attempts to carry complex signal with light?

Answer 5

1880

Question 6

What did Heel approach Brian president of the optical society in 1951 about?

Answer 6

Adding cladding, a layer of material with a lower or refractive index

Question 7

What did Charles K. Kao propose and what year?

Answer 7

If manufacturing could be improved we could lower attenuation levels to 20 dB per kilometer or better

Question 8

What year did they achieve Charles K. Kao’s targeted decibel loss?

Answer 8

1970

Question 9

The U.S. Navy installed a fiber-optic telephone link bored what ship?

Answer 9

USS Little Rock

Question 10

In 1979 what with the new low decibel Per kilometer

Answer 10

0.2 decibel per kilometer