Reducing nonlinear waveform distortion in IM/DD systems by optimized receiver filtering
- 1 September 1994
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Photonics Technology Letters
- Vol. 6 (9) , 1159-1161
- https://doi.org/10.1109/68.324698
Abstract
Nonlinear waveform distortion caused by the combined effect of fiber chromatic dispersion, self-phase modulation, and amplifier noise limits the attainable performance of high bit-rate, long haul optically repeatered systems. Signal processing in the receiver is investigated and found to be effective in reducing the penalty caused by this distortion. Third order low pass filters, with and without a tapped delay line equalizer are considered. The pole locations or the tap weights are optimized with respect to a minimum bit error rate criterion which accommodates distortion, pattern effects, decision time, threshold setting and noise contributions. The combination of a third order Butterworth filter and a five-tap, fractionally spaced equalizer offers more than 4 dB benefit at 4000 km compared with conventional signal processing designs.Keywords
This publication has 9 references indexed in Scilit:
- In-line amplifier transmission distance determined by self-phase modulation and group-velocity dispersionJournal of Lightwave Technology, 1994
- A new design arrangement of transmission fiber dispersion for suppressing nonlinear degradation in long-distance optical transmission systems with optical repeater amplifiersJournal of Lightwave Technology, 1993
- Performance of 10 Gb/s lightwave systems using a adjustable chirp optical modulator and linear equalizationIEEE Photonics Technology Letters, 1992
- Performance of smart lightwave receivers with linear equalizationJournal of Lightwave Technology, 1992
- Single-channel operation in very long nonlinear fibers with optical amplifiers at zero dispersionJournal of Lightwave Technology, 1991
- Electrical signal processing techniques in long-haul fiber-optic systemsIEEE Transactions on Communications, 1990
- Smart optical receiver with automatic decision threshold setting and retiming phase alignmentJournal of Lightwave Technology, 1989
- Frequency chirping in external modulatorsJournal of Lightwave Technology, 1988
- Improved error probability evaluation methods for direct detection optical communication systemsIEEE Transactions on Information Theory, 1987