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Nonlinear crosstalk and two countermeasures in SCM-WDM optical communication systems

Nonlinear crosstalk and two countermeasures in SCM-WDM optical communication systems,10.1109/50.838125,IEEE/OSA Journal of Lightwave Technology,Frank

Nonlinear crosstalk and two countermeasures in SCM-WDM optical communication systems   (Citations: 25)
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We investigate, theoretically and experimentally, crosstalk between wavelengths in subcarrier-multiplexed (SCM) wavelength-division multiplexed (WDM) optical communication systems. Crosstalk arises mainly from interactions between subcarriers on one wavelength and the optical carrier of another wavelength. In a dispersive fiber, crosstalk can be attributed to stimulated Raman scattering (SRS) and cross-phase modulation (XPM) combined with group velocity dispersion (GVD). We investigate the phase relationship between SRS-induced and XPM-induced crosstalks. Crosstalks induced by SRS and XPM add in the electrical domain and can interfere constructively or destructively. Experimental results show that the combined crosstalk level can be as high as 40 dBc after 25 km of SMF with two wavelengths and 18 dBm per wavelength of transmitted power. We propose two crosstalk countermeasures. The first countermeasure uses parallel fiber transmission. We show theoretically that both SRS-induced and XPM-induced crosstalks can be cancelled to the first order. We present an experimental demonstration of concept which has achieved 15 dB of crosstalk cancellation over 200 MHz. The second countermeasure uses optical carrier suppression. We show, theoretically and experimentally, that by suppressing the optical carrier, we can significantly reduce crosstalk while maintaining the same link budget and carrier-to-noise ratio (CNR) at the receiver, 20 dB of crosstalk reduction over 2 GHz has been demonstrated experimentally
Journal: IEEE/OSA Journal of Lightwave Technology - J LIGHTWAVE TECHNOL , vol. 18, no. 4, pp. 512-520, 2000
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    • ...In fiber-based WDM systems, the primary source of crosstalk comes from individual components and from nonlinear effects, including cross-phase modulation (XPM), stimulated Raman scattering (SRS), and optical Kerr effect-polarization dependent loss (OKE-PDL) [1-4]...

    Yoshitomo Okawachiet al. Optical crosstalk in a silicon nanowaveguide

    • ...The same system was analyzed by [4], both analytically and experimentally...
    • ...The theoretical analysis is extended from [3-5]...
    • ...Observing from [3, 4], we can assume that α < ωD∆λ and only consider the dominant terms in the numerator...
    • ...normalized XPM and GVD electrical crosstalk level, XTk [3- 5]...

    H. A. Abdul-Rashidet al. Semi-analytical performance analysis of an SCM-WDM PON in the presence...

    • ...The same system was analyzed by [4], both analytically...
    • ...The theoretical analysis is extended from [3], [4], [5]...
    • ...Observing from [3, 4], we can assume that α<ω sD∆λ and only consider the dominant terms in the numerator...

    H. A. Abdul-Rashidet al. System performance optimization in SCM-WDM passive optical networks in...

    • ...Carrier suppressed formats have been explored to reduce optical nonlinearities [2] or increase gain in analog fiber-optic links [3], [4]...

    A. L. Campillo. Polarization-based single-sideband suppressed carrier modulator

    • ...Analysis for nonlinear distortion including the effect of fiber nonlinearity has been given in [5,6]; this analysis is adequate when the modulating subcarrier frequency is not very high, as the case is in CATV systems...
    • ...However, when the frequency goes up to tens of GHz, the models in [5, 6] will result in significant error even for short fiber links since these models essentially predict an infinite increase of nonlinear distortion along with the fiber length, which in practice is impossible...
    • ...It has been reported [5,6] that a higher subcarrier frequency induces a higher crosstalk among channels through XPM...

    Linghao Chenget al. Nonlinear Distortion due to XPM in Dispersive WDM Microwave Fiber-Opti...

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