The Lightwave Blog

Posted by Stephen Hardy

Today's news of Juniper's OEM agreement with IBM puts me in mind of the switch/router vendor's link with Nokia Siemens Networks (NSN) for an integrated approach to IP over DWDM -- a concept practically owned by Cisco.

I spoke earlier this month to Pathmal Gunawardana, director of business development at NSN, who explained why the combination of NSN and Juniper could beat Cisco at its own telco network game. While he declined to make a feature-to-feature comparison of Juniper's boxes with Cisco's, he was much more willing to suggest that NSN provided the stronger DWDM portfolio.

Specifically, said Gunawardana:

• NSN has a broader, more scalable DWDM offering. While Cisco's gear is principally targeted at the metro, in Gunawardana's view, NSN can offer metro, long-haul, and ultra-long haul platforms, he said.
  
• Since NSN was the market leader in 40-Gbps sales in 2008, the company would be better able than Cisco to leverage volume to create a cost-effective 40-Gbps interface -- not to mention a future 100-Gbps interface.
  

Speaking of these interfaces, Gunawardana said that the 40-Gbps interface would likely leverage the company's current DPSK offerings, at least initially. The company has targeted what he called "CP-QPSK" -- for "coherent polarized QPSK" -- as the technology of choice for the 100-Gbps interface. CP-QPSK will be similar, if not identical, to the dual-polarization QPSK with coherent detection the OIF is currently working on. Once perfected, the technology would likely be used for 40 Gbps as well, he predicted.

Gunawardana said that both interfaces should be available within the next 18-24 months, although he hinted that the 40-Gbps capability would likely appear in the early part of that window and the 100-Gbps technology toward the end. Since the interface will be integrated into the Juniper hardware, Gunawardana conceded that it could be used with DWDM equipment not from NSN. However, such a pairing would likely fall short of the performance a Juniper/NSN combination would provide, he asserted.

Labels: 100G, 40G, Cisco, Juniper, Nokia Siemens Networks, NSN

Posted by Stephen Hardy

The folks at StrataLight Communications followed up the Cisco/Comcast 100G demo announcement by confirming that they had provided the optics. But according to Ross Saunders, general manager of next-generation transport at StrataLight, the company isn't focusing on productizing the interface used in the demo in the short term.

Saunders wouldn't provide many details (such as modulation format) of the "DWDM optics" his company supplied for the demo, other than to confirm that it involved a single wavelength running at 100G. The interface did not use the 100G chipset the company recently announced, either.

As the IC announcement implied and Saunders confirmed, StrataLight is focusing its 100G attention in the near term on a muxponder product that could be used to aggregate 10G and 40G wavelengths as an interim step toward serial 100G transmission. Saunders says the muxponder or "multiplexing transponder" is slated to be delivered to an OEM and a carrier for trials within the next month. When and if the prototype evolves into a commercially available product will hinge largely on the reaction it generates during these trials.

Meanwhile, the company continues its work in the 40G space.

Labels: 100G, 40G, Cisco, Comcast, StrataLight