DWDM Play a significant Role in long-haul optical networks

Dense Wavelength Division Multiplexing (DWDM) is the technology of choice for transporting extremely large amounts of data traffic over metro or long distances in telecom networks. Optical networking and especially the use of DWDM technology has proven to be the optimal way of combining cost efficient transport with advanced functionality, which can cope with the bandwidth explosion from the access network.

DWDM typically has the capability to transport up to 80 channels (wavelengths) in what is known as the Conventional band or C band spectrum, with all 80 channels in the 1550 nm region. DWDM takes advantage of the operating window of the Erbium Doped Fibre Amplifier (EDFA) to amplify the optical channels and extend the operating range of the system to over 1500 kilometers. This denser channel spacing requires tighter control of the wavelengths and therefore cooled lasers as opposed to Coarse Wavelength Division Multiplexing (CWDM) which has broader channel spacing un-cooled lasers.
Transmode uses both DWDM and CWDM technologies as a way of transporting different types of services, e.g. Ethernet, SDH/SONET, and Fibre Channel (FC) for solutions in metro access to regional backhaul networks. DWDM is the variant of WDM technology that provides more functionality in terms of supported distance (for Transmode up to 1500+ km), number of wavelengths and dynamic behavior using ROADM technology.
Both Transmode's TM-Series and TS-Series areDWDM and CWDM agnostic. This means a CWDM network can initially be deployed with either product series, and when required, the network can be simply upgraded to a hybrid CWDM/DWDM network using common cards and pluggable optics. Therefore, by deploying Transmode'sDWDMor CWDM based solutions the lowest possible day 1 cost are enabled without sacrificing the scalability of the network.

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