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19 August 2003 Comparison of alternative carrier-suppressed return-to-zero modulation formats
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Abstract
Carrier-suppressed return-to-zero modulation (CS-RZ), in which there is a 180-degree phase shift between successive pulses, reduces the effects of intrachannel impairments. However, there are a number of variants of CS-RZ that differ in their method of generation, their bandwidth requirements, and their performance. It is shown that a recently proposed technique, in which the RZ signal is generated by filtering a CW signal that is square wave phase modulated (termed CWSW), performs comparably or better than alternative techniques. Relative to a modified duobinary system that results in alternate mark inversion( AMI), CWSW achieves better performance in systems with small dispersion, but slightly poorer performance in systems with larger dispersion and dispersion compensation. The small improvement in performance of AMI relative to CWSW in this latter case is achieved at the expense of requiring a larger transmission bandwidth and more complex transmitter. The physical basis of the impairments in these systems, a peak intensity enhancement phenomenon in CWSW that counters the effects of dispersion, and factors affecting the bandwidth of alternative techniques is discussed.
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Virach Wongpaibool, J. K. Shaw, and Ira Jacobs "Comparison of alternative carrier-suppressed return-to-zero modulation formats", Proc. SPIE 5247, Optical Transmission Systems and Equipment for WDM Networking II, (19 August 2003); doi: 10.1117/12.512705; https://doi.org/10.1117/12.512705
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