Comparison of Different Modulation Formats and their Compatibility with WDM Transmission System

In the work, the intensity and phase modulation methods are compared for different versions of the wavelength division multiplexing (WDM) system. Binary and multilevel code formats are evaluated numerically, with OptSim simulation software at the bit rate of 10 and 40 Gbit/s, using long-fiber spans and dispersion compensation technique. The problems to be overcome at exploitation of multiterabit WDM systems based on 40 Gbit/s optical transmissions are: chromatic dispersion (CD), polarization-mode dispersion (PMD), dispersion slope, and nonlinear effects of the transmission line. We have investigated the potentialities of modulation formats for 40 Gbit/s WDM networks where most of the listed problems are avoided. It is shown that Duobinary and differential phase shift keying (DPSK) modulation formats are perfectly suitable for ultra-high spectral efficient WDM systems and possess high resistance to dispersion and nonlinear optical effects (NOE).

ISSN:: 0868-8257
Lingua:: Inglese

Frequenza di pubblicazione:: 6 volte all'anno
Argomenti della rivista:: Physics, Technical and Applied Physics

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Comparison of Different Modulation Formats and their Compatibility with WDM Transmission System

Pubblicato online: 10 giu 2008

Pagine: 3 - 16

DOI: https://doi.org/10.2478/v10047-008-0005-7

Parole chiavewavelength-division multiplexing (WDM), non-return-to-zero (NRZ), return-to-zero (RZ), Duobinary, differential phase shift key (DPSK), nonlinear optical effects (NOE)

This content is open access.

Parole chiave
wavelength-division multiplexing (WDM), non-return-to-zero (NRZ), return-to-zero (RZ), Duobinary, differential phase shift key (DPSK), nonlinear optical effects (NOE)