The Nyquist theorem is a property of mathematics and has nothing to do with technology. It says that if you have a function whose Fourier spectrum does not contain any sines or cosines above f, then by sampling the function at a frequency of 2f you capture all the information there is. Thus, the Nyquist theorem is true for all media.
Hi, Fiber Optics transmit signal using lights rather than electic current, so when signal passes though an optical fiber cable, it does not generate electric or magnetic field around it, and it is not affected by surrounding magnetic or electric fields Adv of optical fiber is that they are immune to noise, signal passes at lights speed, and no signal power is lost along the transmission line.
Probably more of a question for a university professor or something but I think it is an extreamly important technology because unlike copper wiring, fiber opticals are not suceptible to electical or magnetic interference. Also, with the development of LASER and LED technologies, optical fibers use far less electicity and interpreting information received is faster than copper. There is also, theoretically, no limit to the ammount of data that can be sent accross a single fiber.
There are two basic types of optical fiber.Multi Mode Optical FiberUsed to transmit many signals per fiber. (Multi Mode fibers are generally used for computer networks, lan applications).MultiMode Optical Fiber is produced as 50/125 and 62.5/125. (Core/Cladding diameter in microns.)Single Mode Optical FiberUsed to transmit one signal per fiber (Single Mode fibers are generally used for telephone and cable tv applications.)Single Mode Optical Fiber is produced as 8/125 and 9/125. (Core/Cladding diameter in microns.)
1) Plastic (Polymer) Optical Fiber is used to transmit signals down a flexible, plastic material. 2) Polycarbonate coatings are used on optical discs to prevent scratching the underlying surface that has the actual pits and lands.
Radio Optical fiber Semaphore Heliostat Smoke signals American Sign Language TV remote control Garage-door opener Lantern in the belfry of Old North Church
I cannot see where the Nyquist theorem relates to cables, fiber or not.The theorem I know, the Nyquist-Shannon sampling theorem, talks about the limitations in sampling a continuous (analog) signal at discrete intervals to turn it into digital form.An optical fiber or other cable merely transport bits, there is no analog/digital conversion and no sampling taking place.
The Nyquist theorem is a property of mathematics and has nothing to do with technology. It says that if you have a function whose Fourier spectrum does not contain any sines or cosines above f, then by sampling the function at a frequency of 2fyou capture all the information there is. Thus, the Nyquist theorem is true for all media.
The Nyquist theorem is a property of mathematics and has nothing to do with technology. It says that if you have a function whose Fourier spectrum does not contain any sines or cosines above f, then by sampling the function at a frequency of 2f you capture all the information there is. Thus, the Nyquist theorem is true for all media.
Optical Fiber1. Photon has no mass, and it can travel faster than electron2. In multi-mode fiber, several channels of data can be transmitted at the same time
fibre has higher data capacity, takes less space, is cheaper, etc. than copper.
Optical fiber carries signals through light, and therefore at light speed, the fastest possible, and gets less hot. Copper wire transmits information using electricity, which although fast, is not nearly as fast as light. Fiber optics allows faster transmission of data.
Fiber optic cable is constructed out of glass or plastic, and uses light pulses to transmit data. Copper cable is made out of copper material (not glass or plastic) and uses electrical voltages to transmit signals.
40 GHz
Usually, there is a laser diode that is optically coupled to the fiber.
One of the advantages of optical fiber is that it is NOT susceptible to cross-talk.
An objective type of question on optical fiber is on that focuses on the integral part of fiber optic. A good question would be, " Why are optical fibers immune to EMI? "
1. Copper UTP (Unshielded Twisted Pair) 2. Optical Fiber