More on Optic Fibres...?

Question

Question 3:
What kind of light is used for transmissions in a an OpticFibre?
a. Ordinary high intensity light (Xenon gas-discharge)?
b. Diode laser?
c. Ruby laser?
d. Carbon Dioxide ("Gas-Pumped") laser?
e. Something I haven't heard of yet?

Answer 1

There are various advantages, which make Optical Fibres better than Copper systems. The crucial operating difference between a fibre optic communication system and other types is that signals are transmitted as light. Conventional electronic communication relies on electrons passing through wires. Radio frequency and microwave communications rely on radio waves and microwaves travelling through open space. The major points which distinguish it on positive side are
Low transmission loss and wide Bandwidth:
Small size and Weight
Immunity to interference
Electrical Isolation
Signal Security
Abundant Raw materials
Fibres are not prone to Thefts

Answer 2

Finding a Laser Light Source

At first, lasers were large, expensive and - often - unreliable. Then came light-emitting diodes (LEDs) and semi-conductor lasers. Both sources suit fibre-optic communication. For example, they emit light in the frequencies least absorbed by silica - the basic ingredient of optical fibres. From the beginning, most fibre-optic communication has used the light of infrared (or near-infra red) frequencies.

Several signals, usually with slightly different infra red frequencies, can now be piped down the same fibre at once. But semi-conductor lasers are now almost the universal choice, except with multi-mode fibres (explained later in this section) as they emit light which can be piped down narrow fibres without causing spectrum smear (dispersion), they can be turned off and on in less than 1 nanosecond and can transmit data at rates of more than 1 Gbit/s
http://www.acmi.net.au/AIC/TELSTRA_RAY.html

The history of experimentation with light and its uses as a signalling device in telecommunications, plus an introduction to optical fibre and its many applications
http://www.telstra.com.au/classroom/sec_2_1.htm

So it must be (E)

Answer 3

fiber optics would be verrryyyyyyy costly for something longer then a pair of two foot cord that could be a million/8 of an inch thick remember those lights that had fiber optics cables that frolicked and circled they have been like 30 many times for the fiber optics especially with the aid of fact fiber optic cable is spun glass and is very gentle and to make it even worse the longer the cable is the extra convenient it breaks sorry guy

Answer 4

Fiber optics uses:

* Infrared laser light transmission
* Visible red light transmission

Answer 5

an ordinary light source is transmitted down the optics which is like a clear tube and comes out the other end

Answer 6

I know nothing about fibre optics - but here's a starting point:

http://en.wikipedia.org/wiki/Fibre_optics

Answer 7

it really depends on the mode.

singlemode fiber uses lasers

multimode fiber uses LEDs

Answer 8

pilip andrew laser

Answer 9

the answer is 'e'

because even i haven't heard of it... added to my watchlist though.