To: Cindy B. who wrote (27503 ) 6/12/2000 8:46:00 AM From: JLS Read Replies (1) | Respond to
Going Long On Lightalcatel.com announced a ?world record? for carrying DWDM traffic over very long distances. It cited two successful trials - one carrying 80 channels of 10 Gbit/s traffic over 3,000 kilometers, and the other carrying 32 channels of 40 Gbit/s over 250 kilometers.corvis.com plans to combine two technologies to deliver all-optical networks that could eventually carry multiple 100 Gbit/s channels, according to Scott Clavenna, principal analyst at Pioneer Consulting pioneerconsulting.com . It will use Raman amplifiers to boost signals at intervals. This is done by pumping a different wavelength light into specially doped fiber carrying the signals. It will also use Soliton technology acquired through its purchase of Algety Telecom SA, a French startup (see Algety Telecom SA ), to shape the light signals so they travel further and retain their strength. This promises to boost Corvis's IPO prospects (see Doctor Huber's Revenge ).marconi.com recently set up a business unit called Marconi-Solstis to develop Soliton-based transport systems. The business unit comprises key staff from Aston University?s photonics lab in the UK. ?We should have a system ready for field trials within a year,? says Professor Nick Doran, the unit?s CTO. In the past, Doran's team at Aston University has run 10 Gbit/s over 16,500 kilometers of un-repeatered standard fiber, and 40 Gbit/s over 1,000 kilometers.qtera.com , acquired by Nortel Networks nortelnetworks.com , is adapting undersea cable technology for terrestrial use. Earlier this year , it claimed a record 4,000-km for 10 Gbit/s transmission (see qtera.com .cisco.com is developing ultra-long distance 10 Gbit/s transport technology, according to Pioneer?s Clavenna. However, Cisco will offer it packaged with its routers as a complete solution, not as a standalone product, he adds. Cisco won?t go head to head with Ciena Corp ciena.com and Sycamore Networks Inc. sycamorenet.com , both of whom have their own long distance transport technologies, according to Clavenna.optimight.com , a startup founded by the legendary entrepreneur Wu-Fu Chen, is planning a different approach to long distance optics. It?s using code division multiplexing to enable it to use a broader range of frequencies for carrying each wavelength, without suffering interference between adjoining channels. At the same time, it?s using higher power lasers. This approach is particularly appropriate when transporting light through all-optical switches in mesh networks, according to Clarel Thevenot, Optimight?s director of marketing. Optimight is still in stealth mode, and won?t say what sort of performance it will deliver. It expects to start lab trials at the end of the year.photonex.com , another startup in stealth mode, is also developing ultra-long-distance optical transport systems.lightreading.com
