Fiber optic data transmission technology about DWDM and CWDM

Posted on by FS.COM

Dense Wavelength Division Multiplexing(DWDM) refers to a fiber optic data transmission technology, which parallel transmission using the wavelength of the laser in accordance with the bit or the string line transmission mode in the optical fiber transmission data.

DWDM has three characteristics:(1)Internet diversified services. DWDM and independent of the transmission rate and the Statute that provide and service the form completely unrelated to the transmission network, for example: a transfer rate and the Statute completely transparent DWDM networks and ATM, IP, SDH signal mediated pick provide diversified services network.(2)Reduce costs, improve service quality. Compared to traditional signal assignment or scheduling in optical layer in the layer bandwidth scheduling more simple and efficient, you can reduce expenses. Another network fiber cut or optical signal failure in the optical layer the signal protection switch or network routing reply actions relative to the traditional electric layer reply actions switching time is shorter, so that the network availability increase and improve service quality. (3)Enhance the transmission distance and increase the network capacity. The biggest problem is that on the high speed of STM-64 TDM transmission fiber dispersion serious for the transmission of the light signal will produce deterioration effect, therefore, if you do not use the electronic reproduction or other compensation techniques, theoretically STM-64 signal in G.652 fiber transmission is about 60 km. Terms of the eight-wavelength DWDM technology transfer, each wavelength 2.5Gb / s of the signal, its transmission capacity for 20 Gb / s, the transmission distance of up to 600 km without electronic regenerator, and the need to light amplifier.

Coarse Wavelength Division Multiplexing(CWDM) and DWDM have certain similarities, the main difference is there are three points: (1) CWDM the Lightwave channel spacing wide light wavelength less than DWDM multiplexed on the same fiber. (2) CWDM optical modulation using a non-cooled laser with electronic tuner; DWDM is used in cooling the laser, with the temperature tuning. Because the temperature in a very wide sections of the optical wavelength is very unevenly distributed, therefore temperature tuned to achieve them is very difficult, the cost is also high. CWDM avoid this difficulty, thus greatly reducing the cost, the current the CWDM system cost general only 30% of DWDM. (3) CWDM system power consumption and physical size smaller than DWDM systems.

FiberStore supply 2 types of WDM Equipment, which is DWDM module and CWDM module devices. DWDM modules inlcude DWDM mux/demux module and DWDM OADM module. CWDM modules include CWDM mux/demux module(CWDM multiplexer) and CWDM OADM module. The common configuration of CWDM mux/demux module is 2CH, 4CH, 8CH, 16CH, 18CH CWDM mux/demux module. As for DWDM mux/demux, the common configuration is 2CH, 4CH, 8CH, 16 CH, 32CH, 40CH channels. 3 Single fiber or dual fiber connection for CWDM Mux/demux are available. They are available in the form of Plastic ABS module cassette, 19’’ rack mountable box or standard LGX box. And no matter what kind of connectors, like FC, ST, SC, LC etc, all are available on our website, and we also can mix connector on one device. Buy CWDM modules, DWDM modules and Filter WDM modules on FiberStore with confidence.

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