One, the wavelength division multiplexer

Wavelength division multiplexer is a series of carrying information, but different wavelength signal synthesis of a beam of light, along a single optical fiber transmission;At the receiving end again in some way, separate different wavelengths of light signal communication technology.This technology can be multi-channel signal transmission on a single fiber at the same time, each have a signal transmitted by certain wavelengths of light, it is a wavelength channels.Using WDM technology products mainly of CWDM and DWDM

ITU -t geared to the needs of man, in 2002 formulated the g. 694.2 standard "for the application of WDM spectrum interval: CWDM wavelength interval".In 1270 ~ 1610 nm range, it is suggested that the 18 available wavelength interval 20 nm wavelength (271 nm, 1291 nm, 1311 nm, 1331 nm to 1351 nm, 1371 nm to 1391 nm, 1411 nm to 1431 nm, 1451 nm, 1471 nm, 1491 nm, 1511 nm, 1531 nm, 1551 nm, 1571 nm, 1591 nm).