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ABSTRACT: 40 Gbit/s RZ transmission over a record length of 252 km standard
singlemode fibre using distributed Raman amplification is reported. The
effects of pulsewidth and dispersion compensation are investigated both
theoretically and experimentally
Electronics Letters 06/2001; · 0.96 Impact Factor
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ABSTRACT: We report on 40 Gb/s RZ-transmission over the record length of 252 km standard single-mode fiber using distributed Raman amplification. Effects of pulse width and dispersion compensation were investigated both, theoretically and experimentally.
Optical Fiber Communication Conference and Exhibit, 2001. OFC 2001; 02/2001
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ABSTRACT: Unrepeatered 80 Gbit/s RZ single channel transmission over 160 km
of standard singlemode fibre at 1.55 μm involving the use of passive
compensation of the dispersion and dispersion-slope is reported.
Error-free transmission (BER-10<sup>-9</sup>) with a receiver
sensitivity of -22 dBm and a wavelength tolerance of 10 nm has been
achieved
Electronics Letters 04/2000; · 0.96 Impact Factor
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ABSTRACT: 10 Gbit/s transmission experiments on standard fibre (16 ps/km/nm)
and with >100 km amplifier spacing demonstrate that transmission
lengths of 432 km for RZ and 218 km for NRZ modulation schemes are
possible. Under comparable experimental conditions and in agreement with
theoretical studies
Electronics Letters 01/2000; · 0.96 Impact Factor
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ABSTRACT: We investigate the possibilities of 40 and 4×40 Gb/s time division multiplexing wavelength division multiplexing (TDM/WDM) return-to-zero (RZ) transmission over embedded standard single-mode fibers (SMF) at a transmission wavelength of 1.55 μm both experimentally and theoretically. Dispersion of the SMF is compensated by a dispersion compensating fiber (DCF). Transmission over a span of 150 km of SMF in the single-channel case and of 100 km SMF in the multichannel case are reported. Numerical calculations are employed to investigate the possibility of cascading the spans both for single-channel and multichannel transmission. For single-channel transmission, it is shown that optimum performance is achieved with postcompensation of the DCF. The input power at the SMF and DCF input have to be chosen carefully. For four channel transmission, the performance is mainly limited by residual dispersion in the outermost wavelength channels. It is shown numerically that improvement is achieved by employing the newest type DCF which also compensates the dispersion slope of the SMF. For a WDM channel separation of 2 nm no significant additional degradation due to cross-phase modulation (XPM) or four-wave mixing is observed
Journal of Lightwave Technology 12/1999; 17(11):2276-2284. · 2.78 Impact Factor
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ABSTRACT: We compared numerically and experimentally the transmission behavior of return-to-zero (RZ) and nonreturn-to-zero (NRZ) modulated signals, 10 Gb/s were transmitted over 2040-km standard single-mode fiber using an alternating dispersion compensation scheme in a recirculating loop with 102 km amplifier spacing. Receiver sensitivities of -33 dBm (NRZ) and -35 dBm (RZ) could be achieved. RZ allows for a simple linear dispersion compensation whereas NRZ suffers from nonlinear signal distortion. NRZ requires under-compensation of the linear chromatic dispersion dependent on signal power and transmission length. Therefore, NRZ makes network design more difficult.
IEEE Photonics Technology Letters 05/1999; · 2.19 Impact Factor
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ABSTRACT: A polarization-mode dispersion (PMD) transient recorder setup was
realized enabling for the first time to our knowledge the monitoring of
fast PMD fluctuation with a bandwidth of up to 1 MHz. Thirty-six hours
of observation of an installed field fiber exhibits significant PMD
variation within 10 ms
Optical Fiber Communication Conference, 1999, and the International Conference on Integrated Optics and Optical Fiber Communication. OFC/IOOC '99. Technical Digest; 02/1999
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A. Ehrhardt,
A. Gladisch,
N. Hanik, F. Kuppers,
R. Leppla,
W. Weiershausen,
L. Olofsson,
A. Beka,
T. Tsuda,
K. Yamane,
T. Tsurumi
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ABSTRACT: A fully managed field-installed wavelength-division multiplexed (WDM) link was upgraded with a bidirectional STM-64/OC-192 system and operated with bit error rate <10<sup>-13</sup> without changes of the dispersion-compensated SMF line to demonstrate the upgrade feasibility of transparent links. Dispersion tolerance and PMD influence were investigated
Optical Fiber Communication Conference, 1999, and the International Conference on Integrated Optics and Optical Fiber Communication. OFC/IOOC '99. Technical Digest; 02/1999
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ABSTRACT: 40-Gbit/s OTDM transmission over a field-installed
dispersion-compensated 130-km single mode fibre (SMF) link was
demonstrated successfully (BER < 10<sup>-12</sup>). The impact of
high PMD (7.8 ps) in the order of the RZ pulse width (7 ps) was studied
in detail
Optical Fiber Communication Conference, 1999, and the International Conference on Integrated Optics and Optical Fiber Communication. OFC/IOOC '99. Technical Digest; 02/1999
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ABSTRACT: The influence of Kerr non-linearity (KNL) on optical pulse transmission at 1550 nm wavelength in systems composed of standard monomode fibre and dispersion compensating fibre is investigated experimentally. The significant dependence of the temporal and spectral evolution of picosecond pulses on KNL is demonstrated even at moderate peak powers. Consequences for practical transmission system design are pointed out.
Pure and Applied Optics Journal of the European Optical Society Part A 12/1998; 4(4):459.
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ABSTRACT: We investigate experimentally and theoretically the effect of signal power and dispersion compensation scheme in unrepeated return-to-zero single-channel 40-Gb/s 150-km transmission using standard single-mode fiber (SMF), nonzero dispersion shifted fiber [true wave fiber (TWF)] and dispersion shifted fiber (DSF). It is shown, that standard SMF allows significantly higher fiber-input power than nonzero dispersion shifted fiber or dispersion shifted fiber and, therefore, offers larger transmission spans.
IEEE Photonics Technology Letters 07/1998; · 2.19 Impact Factor
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ABSTRACT: We present experimental and numerical results regarding
polarization-mode dispersion (PMD) influence on ps-pulse transmission.
We show the PMD-induced broadening of ps-pulses during transmission. By
increasing the pulse peak power to soliton level, at which chromatic
dispersion is compensated by self-phase modulation also the additional
PMD-induced broadening can be partly suppressed
Optical Fiber Communication Conference and Exhibit, 1998. OFC '98., Technical Digest; 03/1998
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ABSTRACT: The increasing request for broadband communication services demands for telecommunication networks offering line capacities exceeds those of existing facilities. One way to increase the transmission capacity of a given fiber link is TDM. When installing new transmission links, network operators have to decide which fibers will best meet future traffic requirements. 40-Gbit/s TDM transmission at 1.55 μm over standard single-mode fiber has been reported using various dispersion-compensating techniques: passive dispersion compensation with dispersion-compensating fibers or chirped Bragg fiber gratings and active dispersion compensation by mid-span spectral inversion. In this paper we investigate experimentally and theoretically 40-Gbit/s TDM transmission over TrueWave<sup>TM</sup> fiber (2.3-ps/nm/km chromatic dispersion), standard fiber (16-ps/nm/km), and dispersion-shifted fiber (0.1-ps/nm/km)
Optical Fiber Communication Conference and Exhibit, 1998. OFC '98., Technical Digest; 03/1998
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ABSTRACT: 10 Gb/s transmission experiments in a recirculating loop with
standard single-mode and dispersion compensating fibres show that NRZ-
and RZ-modulated signals can be transmitted over a trunk length of 2000
km with more than 100 km amplifier spacing
Integrated Optics and Optical Fibre Communications, 11th International Conference on, and 23rd European Conference on Optical Communications (Conf. Publ. No.: 448); 10/1997
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ABSTRACT: Unrepeatered 40 Gbit/s RZ single channel transmission over 150 km
of standard singlemode fibre at 1.55 μm is reported using passive
dispersion compensation. The authors investigate the influence of signal
power, the compensation scheme, and the word length. Error-free
transmission (BER=10<sup>-9</sup>) is achieved with a receiver
sensitivity of -27 dBm. Post-compensation allows for higher input powers
and therefore for a higher system margin
Electronics Letters 02/1997; · 0.96 Impact Factor
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ABSTRACT: The authors show, for the first time, the feasibility of upgrading
existing transmission systems, by straight-forward means, to 40 Gbit/s
through 617 km and 80 Gbit/s through 412 km of standard singlemode
fibre, since 10 Gbits-based WDM transmission was achieved without
gain-flattening the commercial optical amplifiers and without
intermediate filtering. Dispersion management was performed hy
dispersion compensating fibre units
Electronics Letters 09/1995; · 0.96 Impact Factor
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ABSTRACT: Results are reported of a transmission experiment at 20 Gbit/s
through 617 km of standard singlemode fibre using two-channel-WDM, 10
dispersion compensating fibre units and 12 optical inline amplifiers.
With 2<sup>31</sup>-1 PRBS the receiver sensitivities were as low as
-32.3 dBm (Mach-Zehnder modulator) and -30.6 dBm (electroabsorption
modulator). The optical path penalties after 617 km transmission were
0.5 and 1.5 dB, respectively
Electronics Letters 03/1995; · 0.96 Impact Factor
