Optics Spectra

The Qualities of Light transmitted through Fiber Optics?

When computers send digital information through fiber optic cables, is the light used of a certain spectrum? What is the general rate of the lightpulses (say, per second or nanosecond)? Also, a little more information on the devices that transmit and receive fiber optic transmissions. What do these machines look like and are capable of?

Secondly, I've under stood that you can use fiberoptics in an analog way, like a doctors hose-like device that can look in the body. Your looking through a thread of glass. Since I assume the analog transmission always has more detail/granularity which is chopped into one's and zeros, will digital ever catch up with reality? Is there someway of having analog information as a source, yet with the convenience of digital storage and manipulation?

Any thoughts or feedback appreciated. Thank you in advance.

Glass fibers are used instead of metal wires because signals travel along them with less loss, and they are immune to electromagnetic interference. Optical fibers are also used to form sensors, and in a variety of other applications.

Light is kept in the "core" of the optical fiber by total internal reflection. This causes the fiber to act as a waveguide. Fibers which support many propagation paths or transverse modes are called multimode fibers (MMF). Fibers which support only a single mode are called singlemode fibers (SMF). Multimode fibers generally have a large-diameter core, and are used for short-distance communication links or for applications where high power must be transmitted. Singlemode fibers are used for most communication links longer than 200 meters.

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Color Measurement with Ocean Optics Spectrometers

What are the units for light intensity?

In class we measured the atomic spectra of an unknown element on a computer using ocean optics spectrometer. Each peak wavelength had a different intensity which was between 0.1 and 0.9. I forgot to right down what were the units for these intensity measurements.

Thanks a lot.

Light intensity is measured in candelas.