Choice of MUX/DEMUX filter characteristics for NRZ, RZ, and CSRZ DWDM systems |
| |
Authors: | Pfennigbauer M Winzer PJ |
| |
Affiliation: | Inst. fur Nachrichtentechnik und Hochfrequenztechnik, Vienna Univ. of Technol., Horn, Austria; |
| |
Abstract: | This paper investigates the influence of filter bandwidth and flank steepness of both multiplexing and demultiplexing filters in dense wavelength division multiplexed systems (spectral efficiency 0.8 b/s/Hz) in the presence of coherent wavelength division multiplexing (WDM) crosstalk. Using a recently introduced technique for the statistically reliable performance prediction of systems impaired by coherent WDM crosstalk, this paper presents numerical results for nonreturn-to-zero (NRZ), 33% duty-cycle return-to-zero (RZ), and 67% duty-cycle carrier-suppressed return-to-zero signals. This paper confirms that steep filter flanks are generally preferable, both in terms of optical signal-to-noise ratio penalty and in terms of filter bandwidth tolerance. |
| |
Keywords: | |
|
|