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

CWDM In comparison with DWDM
Accordingly, they've two important characteristics built into systems employing CWDM optical components which enable easier and so also less expensive in DWDM systems. CWDM really is easy with regards to network design, implementation, and operation. CWDM in concert 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 when it's employed in DWDM networks ring, particularly when systems incorporate optical amplifiers.

CWDM Function
CWDM modules perform two functions. First, they filter the lighting, ensuring just the desired wavelengths are used. Second, they multiplex or demultiplex multiple wavelengths, which can be applied to one fiber link. The visible difference is within the wavelengths, that are used. In CWDM space, the 1310-band as well as the 1550-band are split up into smaller bands, each only 20-nm wide. Inside the multiplex operation, the multiple wavelength bands are combined onto one fiber. Inside the demultiplex operation, the multiple wavelength bands are separated from one fiber.

Generally, a CWDM network takes two forms. A point-to-point system connects two locations, muxing and demuxing multiple signals using 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 include a handful of statistics symptoms right into a just for having employing a one-time fabric. Demux isolate all of the symptoms inside some other type of terminate. Any value reaches an additional wavelength.

CWDM Mux/demux are designed to multiplex multiple CWDM channels into A couple of fibers. Within a hybrid configuration (mux/demux), multiple transmit and receive signals could be combined onto one particular fiber. Each signal is assigned a different wavelength. At each 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 point out point or ring based WDM optical networks. CWDM Mux/demux is modular, scalable and it is perfectly fitted to transport PDH, SDH / SONET, ETHERNET services over WWDM, CWDM and DWDM in optical metro edge and access networks.

The normal configuration of CWDM mux/demux is 2CH, 4CH, 5CH, 8CH, 9CH, 16CH and 18CHCWDM MUX/DEMUX. 3 Single fiber or dual fiber connection for CWDM Mux/demux are also available. These modules passively multiplex the optical signal outputs from 4 or maybe more electronic products, send on them only 1 optical fiber followed by de-multiplex the signals into separate, distinct signals for input into technology in the other end in the fiber optic link.

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