Multiplex communications – Wide area network – Packet switching
Patent
1986-01-28
1987-10-13
Griffin, Robert L.
Multiplex communications
Wide area network
Packet switching
455608, 455611, 455612, 370 1, H04B 900
Patent
active
047003391
ABSTRACT:
The propagation speed of optical solitons in single mode optical fiber depends on the wavelength of the solitons. Thus, if solitons of different wavelengths are co-propagating, "collisions" between pulses can be expected to result. It has been found that collisions between solitons do preserve the soliton character of the colliding pulses, even in the presence of perturbations of the type present in fiber communications systems, e.g., core size variations, distributed or lumped loss, and distributed gain. Thus, a wavelength division multiplexed soliton system is possible, and techniques and formulae for the design of such systems are disclosed. In preferred embodiments, fiber loss is periodically compensated by Raman gain. Typical amplification periods (using currently available silica-based fiber) are 30-50 km, typical pump powers are less than 100 mV, and rate-length products of the order of 3.multidot.10.sup.5 GHz km are possible. Multiplexed soliton systems have several advantages over prior art soliton systems. For instance, they permit attainment of very high transmission rates without the use of very high speed electronics. For instance, an exemplary 3000 km, 24 channel multiplexed soliton system has a total transmission rate of 106 GHz, i.e., 4.5 GHz/channel.
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Electronics Letters, vol. 18, No. 24, Nov. 25, 1982, "Low-Loss Quadruple-Clad Single-Mode Lightguides with Dispersion below 2 ps/km nm Over the 1.28 .mu.m-1.65 .mu.m Wavelength Range" by L. G. Cohen et al., vol. 18, 1982, pp. 1023-1024.
Gordon James P.
Islam Mohammed N.
Mollenauer Linn F.
American Telephone and Telegraph Company AT&T Bell Laboratories
Beek Leslie Van
Griffin Robert L.
Pacher Eugen E.
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