By Bill Woodward
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Additional info for Cabling. Part 2, Fiber-optic cabling and components
If the input power is known, the output power can be calculated, and vice versa. Master It The loss for a length of optical fiber is 4dB. Calculate the loss in power from the optical fiber and the output power of the optical fiber for an input power of 250μW. Calculate the gain or loss in power using the dB rules of thumb. 3. Master It A fiber-optic link has 7dB of attenuation. The output power of the transmitter is 100μW. Using the dB rules of thumb calculate the power at the input to the receiver.
A simple intercom, for example, consists of the sending station (which converts voice into electrical signals), the wire over which the signals are transmitted, and the receiving station (which converts the electrical signal back into voice). Links are often described in terms of their ability to send and receive signals as part of a communication system. When described in these terms, they are broken down into simplex and duplex. Simplex means that the link can only send at one end and receive at the other end.
8 | Chapter 1 History of Fiber Optics and Broadband Access With the invention of the laser in 1960, the potential for increasing communication bandwidths literally increased exponentially. Wavelengths had been slashed from the millimeter range to the micrometer range, and true optical communications seemed within reach. The problems of atmospheric transmission remained, however, and waveguides used for lower frequencies were proving inadequate for optical wavelengths unless they were perfectly straight.
Cabling. Part 2, Fiber-optic cabling and components by Bill Woodward