Abstract
We report on a repeaterless transmission of 2 X 2.5 Gbits/s, 2nm spaced WDM channels over 250 km of dispersion-shifted fiber (DSF) using, as light sources, directly modulated DFB lasers. Back-to-back sensitivity was compared with 125 km and 250 km of transmission throught DSF, for different transmitter power levels, and no significant power penalty was observed.
Highlights
Wavelength-division multiplexing (WDM) in long-span repeaterless transmission links is attractive due to its potential applications in submarine festoon systems
This paper presents a 2 x 2.5 Gbit/s direct modulated WDM repeaterless transmission experiment through 250 km of dispersion-shifted fiber (DSF)
3 - EXPERIMENTAL RESULTS AND CONCLUSION DISCUSSION: In order to evaluate receiver degradation due to non-linear effects, we measured the BER versus sensitivity characteristics for three different transmitter power levels distributed over both channels: 14 dBm, 19.4 dBm and, 24 dBm
Summary
Wavelength-division multiplexing (WDM) in long-span repeaterless transmission links is attractive due to its potential applications in submarine festoon systems. In repeaterless transmission systems external modulation of the optical source has been preferred over direct modulation to reduce the influence of chromatic dispersion. The use of external modulation, in long span repeaterless optical communication system requires dithering of the lasing wavelength, to overcome stimulated Brillouin scattering (SBS). Intensity modulated WDM systems are very attractive due to its simplicity and can overcome the dispersion penalty by the use of a DSF.
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