Demonstration of massive wavelength-division multiplexing over transoceanic distances by use of dispersion-managed solitons.

By combining a special dispersion map that has nearly constant path-average dispersion, a hybrid amplification scheme involving backward-pumped Raman gain, and sliding-frequency guiding filters, we have demonstrated massive wavelength-division multiplexing at 10 Gbits/s per channel, error free (bit-error rate,

Method for facile and accurate measurement of optical fiber dispersion maps.

We describe a method, based on the phase mismatch of four-wave mixing, for direct and accurate measurement of the dispersion map, D(lambda, z), of an optical fiber. The method, which requires no wavelength scanning and access to only one end of the fiber, has produced the data for an entire 34-km span, including hundreds of repetitions for signal averaging, in less than 0.25 s. Spatial resolution and accuracy in that first experimental test were ~1 km and deltaD ~ +/-0.03 ps/(nm km), respectively.

Measurement of timing jitter in filter-guided soliton transmission at 10 Gbits/s and achievement of 375 Gbits/s-Mm, error free, at 12.5 and 15 Gbits/s.

We report on extensive measurement, as a function of distance, of the timing jitter in sliding-frequency-filterguided soliton transmission at 10 Gbits/s. The measured jitter is separated into a sliding-filter-damped, Gordon-Haus term, a similarly damped acoustic term, and a recently predicted contribution from scatter in pulse polarizations. Measured error-free (bit-error rate <10(-10)) distances at 10, 12.5, and 15 Gbits/s are 35, 30, and 25 Mm, respectively.

Experimental study of soliton transmission over more than 10,000 km in dispersiondaggershifted fiber.

Transmission of 50-psec solitons in a 75-km recirculating loop of dispersion-shifted fiber (D = 1.38 psec/nm/km at lambda(s)), using low-gain erbium amplifiers spaced 25 km apart, displays jitter in pulse arrival times consistent with low error rates for transmission over 9000 km and for bit rates ?4 Gbits/sec. Furthermore, a study of soliton pair propagation in the same loop shows no significant interaction over 9000 km for pair spacings >/=5tau.