Datacom
10/06/2020
New solutions for expanding 10GE optical links

By Guilherme Salvadori – Sales Engineer

In September 2019, we posted here on the blog an article about passive DWDM that explains how the technology works and shows the benefits of this solution, detailing how the Datacom portfolio can contribute to expand the capacity of ISPs optical links. Check out that article by clicking here.

To complement our product line for optical multiplexing, which already a MUX / DEMUX of 08 channels over a pair of fibers, Datacom is launching two new models:

 

  • DM936 D32CH19

This is a DWDM MUX / DEMUX of 32x 10 Gbit/s channels that uses two fibers for uplink. With this equipment it is possible to transport up to 320 Gbit/s on a single pair of fibers. The equipment is compact with a height of 1U and can be installed in a 19” rack.

DWDM transceivers should be used at specific wavelengths, ranging from CH19 to CH50 of the C band (according to ITU-T G.694.1).

This solution allows to reach a distance of up to 55km with mux / demux only, without optical amplification:

 

  • DM936 S16CH19:

This is a DWDM MUX / DEMUX of 16x 10 Gbit/s channels, which uses only one fiber for uplink. With this equipment it is possible to transport up to 160 Gbit/s on a single optical fiber. The multiplexer is compact 1U high and can be installed in a 19” rack.

In this solution, the same two-fiber transceivers from CH19 to CH50 in band C are used. Therefore, the access ports are made with two fibers and only the uplink of the system is with one fiber. In the picture below we can see the detail of the connectors of the DWDM channels for two fibers:

The DWDM works in layer 1 of the OSI model (physical), so there is no need to configure the equipment: it is plug-and-play. However, in the case of the DM936 S16CH19, greater attention should be paid to the interconnection of the channels, since there is a cross connection between TX and RX of different channels.

In single fiber (bidirectional) systems, it is necessary that there are no conflicting channels within the spectrum, so we have a wavelength for TX and a different one for RX. In the case of systems with two fibers (unidirectional) the same channel is used for TX and RX, as they are in separate fibers there is no conflict of channels.

As the access channels of the DM936 S16CH19 are unidirectional, this crossing is necessary. Below is an example that better illustrates this scenario:

At site A we have the SFP+ transceiver of the CH19 channel (as indicated on the equipment's screen printing), we will connect TX where it indicates C19 and RX where it indicates C35.

At site B we have the SFP+ transceiver of the CH35 channel, connected in the same position as on site A in the MUX / DEMUX, but inverted (RX in C19 and TX in C35). With that we have the separation of the channels, since the CH19 transmits in the wavelength 1562.23nm and the CH35 transmits at wavelength 1549.32nm. The transceiver's RX does not have a filter, being able to handle wavelengths ranging from 1260nm to 1600nm.

This solution allows to reach a distance of up to 55km with MUX / DEMUX only:

Note: This system does not have optical amplification.

In addition to these two new DWDM MUX / DEMUX, the DM936 D8CH33 of 08x 10 Gbit/s channels, which was detailed in another article on this blog, is also present in the portfolio.

The solution summary is detailed in the following table:

The DM936 multiplexers are compatible with any Ethernet switch on the market, and it is not mandatory to change the equipment already in use.

If it is necessary to include new switches in the scenario with the DWDM multiplexer, Datacom has a large portfolio that includes 1GE, 10GE, 40GE and up to 100GE switches.

For more details, consult the datasheet by clicking on this link, or contact our pre-sales team at: suporte.prevendas@datacom.com.br. We are available to assist you in designing the topology of your network and in choosing the product that best suits your needs.

For questions and request for proposal, do not hesitate to contact Datacom's sales team at: sales@datacom.com.br or (+55) 51 3933 3000.