Performance evaluation of WDM transmission systems for external electrooptic modulated codes is considered. This has been done for two popular line codes which are return-to-zero (RZ) and nonreturn-to-zero (NRZ) formats operating at bit rates of 10 and 40 Gbps. The optical channel consisting of a standard single mode fiber was compensated for chromatic dispersion at 1550 nm by a dispersion compensation fiber. Signal attenuation occurring in both fibers has been compensated by adequate optical amplifiers. Performance of considered systems has been evaluated via the analysis of quality factor profiles. Numerical simulations reveal that external modulation using Mach-Zehnder devices affects more RZ coded systems than NRZ coded ones. This is for the case where the average power and data bit rates are the same for the two codes. The overall results show a net superiority of NRZ modulation scheme over RZ scheme for different fiber spans at various data bit rates.
|Number of pages||6|
|Journal||Journal of Electrical Engineering|
|Publication status||Published - 2013|
- Optical modulator
ASJC Scopus subject areas
- Electrical and Electronic Engineering