Optical fiber communication: it refers to the light as an information carrier, optical fiber as the transmission medium of communication. 

WDM (Wavelength Division Multiplexing), Lightwave share with technology, is transmitted simultaneously in a single optical fiber technology multi-wavelength optical signal. 

 The so-called all-optical network, refers to the entire process of data transmission between the exchange from the source node to the end-user nodes in the optical domain, namely a complete end to end optical path with no electrical intervention.

Fiber optic transceiver is a twisted pair electrical short distance and long-distance optical signal transmission swap Ethernet media conversion unit, also known as the photoelectric converter or fiber optic converters. Today a wide range of fiber optic transceivers, but generally classified as single-mode and multimode. Singlemode multimode fiber is by nature classification.

DWDM is an optical fiber communication transmission technology, it is the use of an optical fiber can simultaneously transmit a plurality of different wavelengths of light characteristic wavelength range into the fiber may be applied to a number of bands, each band used a separate channel to transmit a predetermined wavelength of the optical signal technology.

DWDM Transceiver, as its name suggests, is a kind of optical transceiver which combines the DWDM technology. 

1, outdoor fiber optic cable main center tube, Stranded and slotted core cable, according to the optical fiber bundle and optical fiber ribbon can be divided into ordinary cable, optical fiber ribbon cable and other six kinds of patterns. Each cable Features:

Single-mode fiber is only a single path, and generally used for long-distancetransmission, there are multiple propagation paths of Multimode Fiber, multimodefiber bandwidth for 50MHz~500MHz/km, single mode fiber optic bandwidth up to2000MHz/km, optical fiber wavelength 1550nm and 850nm,1310nm, etc.