Patent ID: 7493050

Claim:
An optical communication system transmitting a plurality of channel wave lengths, said system comprising: a transmitter unit; a receiver unit; an optical transmission path interconnecting the transmitter and receiver units, said transmission path having a concatenation of optical fibers defining a dispersion map having a period and amplifier spacing selected such that both η XPM and η FWM are simultaneously minimized at a selected channel separation, wherein η XPM and η FWM are cross phase modulation efficiency and four wave mixing efficiency respectively, wherein cross phase modulation efficiency is computed from η XPM = a 2 Ω m 2 ⁡ ( D ⁢ ⁢ Δ ⁢ ⁢ λ ) 2 + a 2 ⁡ [ 1 + 4 ⁢ ⁢ sin 2 ⁡ ( Ω ⁢ ⁢ D ⁢ ⁢ Δ ⁢ ⁢ λ ⁢ ⁢ L / 2 ) ⁢ ⅇ - aL ( 1 - ⅇ - aL ) 2 ] and wherein four wave mixing efficiency is computed by η = a 2 N 2 ⁡ ( a 2 + Δ ⁢ ⁢ β 2 ) ⁡ [ 1 + 4 ⁢ ⅇ - a ⁢ ⁢ 1 amp ⁢ sin 2 ⁡ ( Δ ⁢ ⁢ β ⁢ ⁢ l amp / 2 ) [ 1 - ⅇ - al amp ] 2 ] ⁢ sin 2 ⁡ ( N ⁢ ⁢ Δ ⁢ ⁢ β ⁢ ⁢ l amp / 2 ) sin 2 ( ⁢ Δ ⁢ ⁢ β ⁢ ⁢ l amp / 2 ) .