Enterprise Architecture A to Z

Evolving MAN/WAN Technologies ◾ 353

of eight wavelengths from 1470 to 1610 nm in 20 nm increments. ese wavelengths take advan-

tage of the full optical-fiber spectrum, including the legacy optical sources at 1310, 1510, and

1550 nm, while maximizing the number of channels. e 20 nm channel spacing supports lower

component costs with the use of uncooled lasers and wideband filter. It also avoids the high-loss

1270 wavelength and maintains a 30 nm gap for adjacent band isolation [GEO200101].

10.2.2.13 All-Optical Networks

At the beginning of this decade there was a lot of fanfare about the Optical Transport Net-

work (OTN) and the companion Automatic Switched Optical Network (ASON). e OTN is

intended to be an evolution of the carrier’s network ...