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8 July 2002 New dispersion-resistant modulation format for fiber optic transmission
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Proceedings Volume 4872, Optical Transmission Systems and Equipment for WDM Networking; (2002)
Event: ITCom 2002: The Convergence of Information Technologies and Communications, 2002, Boston, MA, United States
We propose and evaluate a new return-to-zero (RZ) transmission format, which simplifies the transmitter and produces significantly improved eye diagrams at the receiver compared with other formats. By applying synchronous square wave phase modulation (PM) to a continuous wave (CW) signal, with a 180 degrees phase shift (phase reversal) between adjacent bit slots, and followed by an optimally tuned optical filter, we generate a train of RZ pulses which is inherently stable and resistant to dispersive and nonlinear effects. Separate amplitude modulation (AM) is unnecessary in this approach to shape the RZ pulses. This format (which we term CWSW) not only suppresses the growth of spurious pulses on adjacent "1" states, but also results in a peak intensity enhancement where waveform distortion caused by fiber dispersion initially improves the eye opening during transmission. Single-channel 40 Gbits/s systems employing dispersion-shifted fibers are investigated by computer simulations. We show that spurious pulse suppression and peak intensity enhancement increase the maximum transmission distance and improve the eye profile at the receiver relative to alternative transmission formats.
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Virach Wongpaibool, John Kenneth Shaw, and Ira Jacobs "New dispersion-resistant modulation format for fiber optic transmission", Proc. SPIE 4872, Optical Transmission Systems and Equipment for WDM Networking, (8 July 2002);

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