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Technology Stocks : LAST MILE TECHNOLOGIES - Let's Discuss Them Here
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To: Bernard Levy who wrote (5450)10/5/1999 2:10:00 PM
From: Geof Hollingsworth  Read Replies (2) of 12823
 
Hi Bernard-further on Solitons

A factoid which I know you are well aware but others may find of interest is that Solitons (like Bragg gratings) are not a new idea at all-they were first documented in 1834 by Scottish engineer John Scott Russell. Russell observed the Soliton wave phenomena in the water while studying the movement of canal boats. As you say, it is only since the development of EDFAs that there has been a commercial application for the technology.
The Soliton applications I find of most interest are for high bit rate (OC 192) DWDM systems, where the traditional non-return to zero (NRZ) encoding for each wavelength starts to run out of gas because of the fiber non-linearity distortions and the intermodulation between the DWDM channels themselves (four-wave mixing). Soliton modulation takes advantage of fiber non-linearities potentially resulting in longer transmission distances, the elimination of some of the electrical equipment in the network, and higher power (Soliton return-to-zero pulses have higher peak power than NRZ pulses). In addition to Lucent, I know that Pirelli is working on this, and I understand that both Qtera and Algety are basing their products around applications of Soliton technology.
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