Per Bang Hansen

3.28-Tb/s transmission over 3 x 100 km of nonzero-dispersion fiber using dual C- and L-band distributed Raman amplification

A record aggregate capacity of 3.28-Tb/s (82/spl times/40 Gb/s NRZ) is transmitted over 3/spl times/100 km of nonzero-dispersion fiber. The system incorporates for the first time dual C- and L-band transmission and distributed Raman amplification in addition to the 40-Gb/s NRZ line rate.

3.28 Tb/s (82/spl times/40 Gb/s) transmission over 3/spl times/100 km nonzero-dispersion fiber using dual C- and L-band hybrid Raman/erbium doped inline amplifiers

We demonstrate transmission of a record aggregate capacity of 3.28 Tb/s (82/spl times/40 Gb/s PRBS 2/sup 31/-1 NRZ) over 3/spl times/100 km of a demonstration TrueWave(R) fiber with very low dispersion slope. The system for the first time incorporate dual C- and L-band transmission and distributed Raman amplification in addition to the 40 Gb/s line rate.

Dynamic post dispersion optimization at 40 Gb/s using a tunable fiber Bragg grating

A compact tunable fiber Bragg grating that uses distributed thin-film heaters on the surface of the fiber is used to dynamically optimize the post dispersion compensation of a multi-span 40-Gb/s nonreturn-to-zero (NRZ) transmission system. Dynamic post dispersion compensation with this device enables the system to operate over a much wider range of launch power than is otherwise possible with simple, fixed compensation using dispersion compensating fiber.

Duobinary transmitter with low intersymbol interference

A duobinary transmitter employing two-level electrical drive signals for the modulator, exhibits negligible penalties for transmitting 2/sup 7/-1 as well as 2/sup 31/-1 pseudorandom bit sequences (PRBSs). Previous implementations of duobinary transmitters have relied on driving the modulator with three-level electrical signals, which are very susceptible to distortion in saturated amplifiers. The logic operation necessary for generating an optical duobinary signal is carried out in the dual-drive Mach-Zehnder modulator.

Photon statistics of amplified spontaneous emission noise in a 10-Gbit/s optically preamplified direct-detection receiver.

We verify experimentally, over a dynamic range of 55 dB in the probability distribution, that the amplified spontaneous emission noise of the 0s from an optically preamplified receiver is degenerate Bose-Einstein distributed. Using the noise parameters extracted from the experiment, we are able to predict the sensitivity of a 10-Gbit/s direct-detection receiver.

Electrically tunable power efficient dispersion compensating fiber Bragg gratings for dynamic operation in nonlinear lightwave systems

We demonstrate a power efficient (<0.5 W) tunable dispersion compensating fiber Bragg grating device and show for the first time dynamic optimization of dispersion in a nonlinear lightwave system. Operation is demonstrated in a 20 Gbit/s single channel NRZ system where the device was used to adjust the dispersion to the power-dependent optimal dispersion required for optimum performance.

In-band amplified spontaneous emission noise filtering with a dispersion-imbalanced nonlinear loop mirror

We report removal of in-band amplified spontaneous emission (ASE) noise in a 10-Gbit/s noise-loaded RZ signal using a dispersion-imbalanced loop mirror. The resulting receiver sensitivity is improved from -37.0 dBm to -37.7 dBm. The loop mirror bias dependence of sensitivity is also investigated, and the optimal bias point is found to be where the transmission decreases with increasing input power.

Technique for obtaining a 2.5 dB increase in the stimulated Brillouin scattering threshold of Ge-doped fibers by varying fiber draw tension

Summarizing, we have shown that it is possible to obtain a reduction in the SBS threshold through variation in the draw tension of Ge-doped core fibers. A 2.5 dB reduction in the SBS threshold was achieved by using a trapezoid variation in draw tension, as a function of fiber length.