Optical Amplifiers
Cost efficiency has led to repeaters being largely replaced in long-haul systems by optical amplifiers since one (broadband) amplifier can be used for many wavelengths in a Wavelength Division Multiplexing (WDM) system. Note that this class of device is sometimes called "Optical Amplifier Repeater".
Read more about this topic: Optical Communications Repeater
Famous quotes containing the word optical:
“It is said that a carpenter building a summer hotel here ... declared that one very clear day he picked out a ship coming into Portland Harbor and could distinctly see that its cargo was West Indian rum. A county historian avers that it was probably an optical delusion, the result of looking so often through a glass in common use in those days.”
—For the State of New Hampshire, U.S. public relief program (1935-1943)