Nonlinear evolution of ASK and PSK signals in repeaterless fibre links

Iannone, E.; Locati, F. S.; Matera, F.; Romagnoli, M.; Settembre, M.

doi:10.1049/el:19921217

Cited by 17 publications

(6 citation statements)

References 3 publications

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“…In this condition, that is practically present in conventional step-index fibers and in dispersion shifted fibers presenting values of GVD larger than 1 ps 2 /km, the presence of the ASE does not deeply modify the signal evolution that is mainly governed by the interplay between Kerr effect and GVD [12]. We extend the results, recently demonstrated in the absence of the ASE [7][8][9], that a nonlinear Kerr compensation of the signal degradation due to the fiber chromatic dispersion is still possible for intensity and phase modulated signals in the presence of the ASE in the anomalous dispersion region of the fiber, even though the amplitude modulated signals present better performance than the phase modulated signals. Such result offers the possibility to design, in the anomalous dispersion region of the fiber, systems that do not require a fine adjustment of GVD, using absolute value of chromatic dispersion higher than in normal dispersion region.…”

Section: Introductionsupporting

confidence: 72%

“…In the normal region, for the IM signals, the spectral broadening is mainly due to the FWM process. In the case of the PM signals the broadening effect of the FWM is counterbalanced by a MI effect which tends to amplify the central frequencies at the expence of the off-central frequency inducing a narBrought to you by | New York University Bobst Library Technical Services Authenticated Download Date | 7/8/15 11:37 AM rowing of the PM signal spectrum [8,18]. Such effect is much less efficient in IM signals where the power of the off-central frequencies is much lower with respect to the central frequencies.…”

Section: Resultsmentioning

confidence: 98%

“…In the case of the PSK coherent homodyne systems the receiver is composed by an electrical third-order Butterworth filter, with a bandwidth equal to R, followed by a phase detector and an electrical second-order Butterworth filter with a bandwidth equal to 0.8 R [8,14].…”

Section: Modelmentioning

confidence: 99%

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Nonlinear Evolution of Amplitude and Phase Modulated Signals and Performance Evaluation of Single-channel Systems in Long Haul Optical Fiber Links

Matera¹,

Settembre²

1996

Journal of Optical Communications

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In this work we numerically study the signal evolution in long haul links in presence of nonlinear Kerr effect, chromatic dispersion and ASE of the optical amplifiers, and the performance of long-haul IM-DD and PSK coherent systems is also evaluated.Propagation in condition of low and high chromatic dispersion is analyzed taking into account also the chromatic dispersion fluctuations. In the first propagation regime the signal presents a large spectral broadening due to the nonlinear interaction between ASE and signal. Conditions for transmission of NRZ intensity and phase modulated signals are found, even though the IM-DD systems present better performance. In the second propagation regime the nonlinear Kerr effect can compensate the degradation induced by the chromatic dispersion both for amplitude and phase modulated signals in the anomalous dispersion region. Also in this regime the IM-DD systems present better performance than the PSK ones and soliton propagation, included in this regime, allows us to obtain the best conditions for signal transmission.A performance comparison among optical systems, considering the two propagation regimes, shows that the best performance is obtained by means of soliton IM-DD systems in the case of very long distances (> 6000 km) and by means of conventional IM-DD systems operating at the zero dispersion wavelength in the case of long distances (< 6000 km). The zero dispersion wavelength condition can be practically obtained considering links with a fluctuating GVD presenting an average value equal to zero.

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Section: Introductionsupporting

confidence: 72%

Section: Resultsmentioning

confidence: 98%

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Nonlinear Evolution of Amplitude and Phase Modulated Signals and Performance Evaluation of Single-channel Systems in Long Haul Optical Fiber Links

Matera¹,

Settembre²

1996

Journal of Optical Communications

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“…The figure shows how increasing the input peak power decreases the BER until a power threshold P,, which for N = 50 is about 8 mW. For P < P,, such a behavior is due to the improvement of the signal-to-noise ratio between the signal and the ASE and to the nonlinear compensation of the GVD [14]. Figure 2 shows how a minimum BER of l o p y and can be obtained for a maximum number of nodes 10-I ? equal to 67 and 50, respectively.…”

Section: Resultsmentioning

confidence: 93%

Performance evaluation of optically amplified systems operating in optical networks

Matera

Settembre

1996

Microw. Opt. Technol. Lett.

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“…In the case of the coherent asynchronous ASK system, at the input of the photodiode the sum of the fields coming from the fiber and from the local oscillator is present. The signal at the photodiode output is filtered by a secondorder Buttenvorth filter (SOBF), presenting a bandwidth ( B ) equal to R and then squared, before passing through a SOBF with a bandwidth equal to 0.8R [12]. In the case of the IM-DD systems, an optical preamplifier plus optical filter feeds a photodiode.…”

Section: Modelmentioning

confidence: 99%