CWDM (Coarse Wavelength Division Multiplexing) is really a technology which multiplexes multiple optical signals one fiber optic strand through the use of different wavelengths, or colors, of laser light to carry different signals. CWDM technology uses ITU standard 20nm spacing amongst the wavelengths, from 1270nm to 1610nm.

CWDM Compared With DWDM
Accordingly, they've got two important characteristics inherent in systems employing CWDM optical components which enable easier and so also less expensive in DWDM systems. CWDM is very easy with regards to network design, implementation, and operation. CWDM works with few parameters which need optimization through the user, while DWDM systems require complex calculations of balance of power per channel, that's further complicated when channels are added and removed or if it's found in DWDM networks ring, particularly if systems incorporate optical amplifiers.

CWDM Function
CWDM modules perform two functions. First, they filter the lighting, ensuring the desired wavelengths are widely-used. Second, they multiplex or demultiplex multiple wavelengths, which can be placed on just one fiber link. The main difference is incorporated in the wavelengths, which are used. In CWDM space, the 1310-band along with the 1550-band are broken into smaller bands, each only 20-nm wide. From the multiplex operation, the multiple wavelength bands are combined onto only one fiber. From the demultiplex operation, the multiple wavelength bands are separated from just one fiber.

Generally, a CWDM network takes two forms. A point-to-point system connects two locations, muxing and demuxing multiple signals on one fiber. A loop or multi-point system connects multiple locations, typically using Add/Drop modules.

CWDM Modules Types
CWDM Modules utilize thin-film coating and micro optics package technology. CWDM modules could decide among two main configurations: CWDM Multiplexer/Demultiplexer (CWDM Demux) modules and CWDM Add/Drop Multiplexer (CWDM OADM) modules.

Mux products incorporate a few statistics symptoms right simply for having by using a one-time fabric. Demux isolate all the symptoms in the other sorts of terminate. Any value reaches an extra wavelength.

CWDM Mux/demux are created to multiplex multiple CWDM channels into A few fibers. In a hybrid configuration (mux/demux), multiple transmit and receive signals can be combined onto a single fiber. Each signal is assigned an alternate wavelength. At each and every end, transmit signals are muxed, while receive signals are demuxed. CWDM Mux/demux is usually a flexible plug-and-play network solution, allowing carriers and enterprise companies to cheaply implement indicate point or ring based WDM optical networks. CWDM Mux/demux is modular, scalable and it's really perfectly designed to transport PDH, SDH / SONET, ETHERNET services over WWDM, CWDM and DWDM in optical metro edge and access networks.

The most popular configuration of CWDM mux/demux is 2CH, 4CH, 5CH, 8CH, 9CH, 16CH and 18CH CWDM MUX/DEMUX. 3 Single fiber or dual fiber connection for CWDM Mux/demux can also be found. These modules passively multiplex the optical signal outputs from 4 or even more electronics, send to them just one optical fiber and after that de-multiplex the signals into separate, distinct signals for input into technology at the opposite end of the fiber optic link.