H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 10/18 (2006.01) H04B 10/00 (2006.01) H04B 10/148 (2006.01)
Patent
CA 2112175
- 14 - TECHNIQUE FOR REDUCING NONLINEAR SIGNAL DEGRADATION AND FADING IN A LONG OPTICAL TRANSMISSION SYSTEM Abstract A technique for reducing nonlinear signal degradation and fading over optical transmission systems by simultaneously launching two optical signals of different wavelengths and substantially orthogonal relative polarizations, into the same transmission path. The launched signals, which are collected at the receiving end of the transmission path, have equal optical power levels, and are modulated to carry identical information. Since the two signals are launched into the transmission path with substantially orthogonal polarizations and comparable power levels, the overall transmitted signal is essentially unpolarized. As a result, the impact of any detrimental polarization dependent effects within the transmission system are minimized. In addition, since the launched signals are combined at the receiving end of the transmission path, the power level of each individual signal can be reduced, thereby diminishing the impact of those nonlinear effects which increase as a function of power level.
Bergano Neal S.
Li Tingye
American Telephone And Telegraph Company
Kirby Eades Gale Baker
LandOfFree
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