Condensed Matter Physics Seminar
Solitons vs. NRZ: What is the Difference?
Professor Curtis R.
Dept. of Computer Science and Electrical Engineering
University of Maryland, Baltimore
During much of the 1990s a controversy raged among the scientists and engineers working on optical communications systems as to whether solitons or non-return-to-zero (NRZ) pulses should be used. To this day, physicists and applied mathematicians who work on solitons often ask, "Whatever happened to soliton communications?" In fact, the NRZ format evolved from NRZ to "nearly return-to-zero" to "chirped-return-to-zero," while the soliton format evolved from stationary solitons that did change their shape while propagating to "averaged solitons," then "periodically-stationary dispersion-managed solitons," and finally "quasilinear dispersion-managed solitons." Effectively, by the late 1990s, the two formats had converged. The presentation provides a historical view of how an important technology evolved. A video clip of a commentary by the late Professor Hermann Haus of MIT on these issues is included.
Thursday, January 26, 2006
Gant Science Complex
(The seminar is followed by coffee/tea, cookies, and an informal discussions.)