Chromatic dispersion compensated optical fiber communication sys

Details Chromatic dispersion compensated optical fiber communication sys Chromatic dispersion compensated optical fiber communication sys

1992-12-22

1993-11-09

Ullah, Akm E.

Optical waveguides

With optical coupler

Particular coupling function

G02B 600, G02B 636

Patent

active

052610160

ABSTRACT:
An optical fiber communication system according to the invention comprises, in addition to conventional single mode (SM) optical fiber, dispersion compensating (DC) optical fiber. The DC fiber is selected such that its chromatic dispersion (D.sub.DC (.lambda.)) and first derivative of the chromatic dispersion with respect to wavelength (D'.sub.DC (.lambda.)) at a wavelength .lambda.=.lambda..sub.op have opposite sign from those of the SM fiber. Advantageously, the DC fiber is selected such that L.sub.DC .multidot.D.sub.DC (.lambda.)+L.multidot.D(.lambda.) is approximately zero at .lambda.=.lambda..sub.op, and such that D'.sub.DC (.lambda.) is approximately equal to --(L/L.sub.DC).multidot.D'(.lambda.) at .lambda.=.lambda..sub.op, where L.sub.DC and L are appropriate lengths of DC and SM fiber, respectively. Typically, L is much greater than L.sub.DC, and .lambda..sub.op typically is about 1.5 .mu.m, e.g., about 1.56 .mu.m. Preferred embodiments of the invention have low chromatic dispersion over a substantial wavelength region (e.g., dispersion less than 1.5 ps
m.multidot.km over at least 50 nm) that includes .lambda..sub.o, facilitating wavelength division multiplexing.

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