Berthold Wedding

10-Gb/s optical transmission up to 253 km via standard single-mode fiber using the method of dispersion-supported transmission

Using the new method of dispersion-supported transmission, 10 Gb/s signals at 1.53 /spl mu/m wavelength are transmitted on standard single-mode fiber with zero dispersion at 1.3 /spl mu/m via the record length of 253 km without in-line regeneration. Detailed experiments with a directly modulated laser demonstrate the system performance for different fiber lengths ranging from 0 up to 253 km. >

Influence of fiber nonlinearity on the phase noise to intensity noise conversion in fiber transmission: theoretical and experimental analysis

Intensity noise resulting from the phase modulation to intensity modulation conversion of laser phase noise can be a major impairment in direct detection systems. In this paper, we investigate theoretically and experimentally the influence of fiber nonlinearity on the conversion of laser and optical amplifier phase noise to intensity noise by fiber transmission. Very good agreement of relative intensity noise (RIN) spectra at the output of a standard singlemode fiber between experimental data and theoretical predictions has been achieved. Results reveal that the fiber nonlinearity can enhance significantly the RIN magnitude and lead to a shift of the RIN dips toward higher frequencies, and consequently to a broader RIN spectrum at fiber output.

Fast adaptive control for electronic equalization of PMD

We propose an adaptive control scheme, based on the least mean squares algorithm, for electronic equalization of polarization mode dispersion. Fast adaptation is demonstrated by numerical simulations and experiments at 10 Gb/s.

Enhanced PMD mitigation by polarization scrambling and forward error correction

We propose a new fibre polarization mode dispersion (PMD) mitigation scheme that combines polarization scrambling with forward error correction and adaptive electronic equalization. Simulations demonstrate that the remaining power penalties are significantly reduced.

10-Gb/s transmission and beyond

The authors outline obstacles encountered in the development of 10-Gb/s (STM-64, OC-192) systems. Technologies to overcome these obstacles are presented and compared, taking into account real field environments. A perspective on 40-Gb/s systems technologies is also given. >

Influence of fiber nonlinearity on the fiber transfer function: theoretical and experimental analysis

The influence of fiber nonlinearity on the fiber transfer function is investigated theoretically and experimentally. A rigorous expression for the fiber transfer function using a directly modulated semiconductor laser as an optical transmitter is presented. Very good agreement of fiber transfer function between experimental data and theoretical predictions is achieved. Furthermore, the fiber parameter values extracted from fitting are the same as those obtained from relative intensity noise measurements, and the fiber nonlinearity coefficient value is compared with other published results. A thorough physical explanation for the effect of fiber nonlinearity on the fiber transfer function at low-medium frequencies is provided. Results reveal that in the anomalous dispersion regime the fiber nonlinearity enhances the high-pass behavior typical of the fiber transfer function using a directly modulated laser operating at high bias current, shifts the transfer function dips toward higher frequency, and consequently leads to a larger bandwidth. Furthermore, it is shown that the fiber nonlinearity can provide partial or total compensation of the nonuniform frequency response at low-medium frequencies resulting from a directly modulated laser operated at low bias current.

40 Gbit/s quaternary dispersion supported transmission field trial over 86 km standard singlemode fibre

40 Gbit/s transmission on a single optical carrier using electrical time division multiplexing is demonstrated for the first rime reusing already installed standard single mode fibres. Bit-error measurements as well as video transmission via STMI interfaces are reported.

Electronic equalization of fiber PMD-induced distortion at 10 Gbit/s

Summary form only given. In summary, at 10 Gbit/s the successful operation of a tapped delay line filter serving as an electronic (PMD) polarisation mode dispersion fibre equalizer was demonstrated by reducing the power penalty due to transmission via a real high PMD fiber by 8.2 dB.

40 Gbit/s quaternary dispersion supported transmission over 31 km standard singlemode fibre without optical dispersion compensation

Using electrical time division multiplexing and demultiplexing, 40 Gbit/s transmission over an uncompensated standard singlemode fibre link is reported for the first time. The system includes a decision circuit realised in SiGe HBT technology.

Electronic equalisation of PMD and chromatic dispersion induced distortion after 100 km standard fibre at 10 Gbit/s

Polarisation mode dispersion distortion equalisation with more then 11 dB power penalty reduction is demonstrated for the first time at 10 Gbit/s after 100 km standard fibre using electronic filtering in the receiver. We report on the combination of chromatic dispersion management using the dispersion supported transmission (DST) method and the compensation of the polarisation mode dispersion (PMD) distortion by an electronic equalisation filter realised in an optical receiver.