CWDM The Amount Of Channels Is More Than In Standard WDM

In recent years with the development of multimedia communication and the wide application of computer technology, the field of information exchange range expanding network communication capacity increased dramatically, thus increasing the telecommunications network capacity is becoming increasingly important. The optical fiber of the most important feature is the large capacity, and can transmit high rate digital signals. Thus, the fiber optic communication has become the trend of the development of the telecommunications industry in the future.

WDM systems are popular with telecommunications companies because they allow them to expand the capacity of the network without laying more fiber. By using WDM and optical amplifiers, they can accommodate several generations of technology development in their optical infrastructure without having to overhaul the backbone network. Capacity of a given link can be expanded simply by upgrades to the multiplexers and demultiplexers at each end.

This is often done by use of optical-to-electrical-to-optical (O/E/O) translation at the very edge of the transport network, thus permitting interoperation with existing equipment with optical interfaces.

WDM systems are divided into different wavelength patterns, conventional/coarse (CWDM) and dense (DWDM).Now, I will introduct the CWDM modules in this article.

Coarse wavelength division multiplexing (CWDM) is a method of combining multiple signals on laser beams at various wavelengths for transmission along fiber optic cables, such that the number of channels is fewer than in dense wavelength division multiplexing (DWDM) but more than in standard wavelength division multiplexing (WDM).

CWDM systems have channels at wavelengths spaced 20 nanometers (nm) apart, compared with 0.4 nm spacing for DWDM. This allows the use of low-cost, uncooled lasers for CWDM. In a typical CWDM system, laser emissions occur on eight channels at eight defined wavelengths: 1610 nm, 1590 nm, 1570 nm, 1550 nm, 1530 nm, 1510 nm, 1490 nm, and 1470 nm. But up to 18 different channels are allowed, with wavelengths ranging down to 1270 nm.

The energy from the lasers in a CWDM system is spread out over a larger range of wavelengths than is the energy from the lasers in a DWDM system. The tolerance (extent of wavelength imprecision or variability) in a CWDM laser is up to ± 3 nm, whereas in a DWDM laser the tolerance is much tighter. Because of the use of lasers with lower precision, a CWDM system is less expensive and consumes less power than a DWDM system. However, the maximum realizable distance between nodes is smaller with CWDM.

CWDM Mux/Demux module- CWDM MUX and CWDM Demux are designed to multiplex multiple CWDM channels into one or two fibers. The core of CWDM module application is the passive MUX/DEMUX unit. The common configuration is 1x4, 1x8, 1x16 channels. Available in 19" Rack Mount or LGX module package. Optional wide band port for existing 1310nm or 1550nm port is available to multiplex with these CWDM Channels. Together with our CWDM Transceiver series or the wavelength converter series, the bandwidth of the fiber can be utilized in a cost effective way.The CWDM module features wide channel bandwidth (13nm). Its isolation is greater than 30dB for adjacent channels, and greater than 40dB for non-adjacent channels. The module also has high thermal stability to ensure reliable performance under different environment.

Fiberstore has all kinds of fiber optic products,we provide the full range of WDM systems.If you want to know more WDM systems,or you have any questions in CWDM module,welcome to contact us via sales@fiberstore.com .I hope to help you.