Optical Transport

Dense wavelength-division multiplexing – efficient transport in metro and long-haul optical networks

            DWDM is the technology of choice for transporting extremely large amounts of data   traffic over metro or long distances in telecom networks. Optical networking andespecially the   use of DWDM technology has proven to be the optimal way of combining cost-efficient transport with advanced functionality that can cope with the bandwidth explosion from the access network.
            DWDM  puts  data  from  different  sources  together  on  an  optical fiber, with each signal carried at the same time on its own separate light wavelength. Using DWDM, 80 (or more) separate wavelengths or channels of data can be multiplexed into a light stream transmitted on a single optical fiber. Since each channel is demultiplexed at the end of the transmission  back  into the original  source,  different  data   formats   being   transmitted   at   different  data  rates  can  be transmitted together. Specifically, internet (IP), SONET and Ethernet data can all be traveling at the same time within the optical fiber. A super-channel is an evolution in DWDM in which several optical  carriers  are  combined  to  create   a   composite   line – side signal of the desired capacity,   and   which  is   provisioned  in  one  operational cycle. This multi-carrier approach to building a DWDM network delivers scalability to terabits and beyond.


Embedded xWDM solutions

The  simplest  way  to  create  a  wavelength  division multiplexing (WDM) network  is using an embedded xWDM solution. In an embedded solution, a CWDM or DWDM transceiver is connected directly into a SAN or IP switch. Each signal that comes from the different transceivers is then connected to a multiplexer, which gathers them together and transports them over a single optical fiber link.
The recipe for data connectivity using a WDM system requires four main ingredients: dark fiber, an optical transceiver, a multiplexer, and a patch cord connecting the transceiver and the multiplexer. With only these components, an embedded WDM solution is as simple as connecting a single channel transceiver to a data switch to connect it to another switch via a line fiber. And it’s as easy to implement and manage.


Carrier Ethernet over both a fiber and a 4G/LTE radio

When  there is no  fiber plant  in  the  ground,  it  often takes a Service Provider significant time to provision fiber in order to  deliver  a  Carrier Ethernet service – in some instances this can take months. In the meantime, the Enterprise customer will have to make do with whatever connectivity is available – often this may be an xDSL service.

The Service Provider can use a Liberator 305-LTE to deliver Carrier Ethernet services using the in-built 4G/LTE radio. The Liberator 305-LTE establishes an L2TPv3 tunnel over the 4G radio.