Abstract
The transmission performances of the wavelength-division-multiplexed
passive optical networks based on directly modulated self-seeded reflective
semiconductor optical amplifiers (RSOAs) are investigated and analyzed. The
impacts of signal extinction ratio (ER), stable seeding power, pattern length
dependency, bandwidth and shape factor of the wavelength multiplexer within
the self-seeding cavity, and length of the self-seeding cavity on the transmission
performance are investigated. The ER is optimized to bring the best receiver
sensitivity when the loss of the self-seeding cavity is fixed. The optimal
ER and the corresponding receiver sensitivity are improved with the stable
seeding power which decreases with the loss of the self-seeding cavity. Compared
to the Gaussian-shaped pass band, the wavelength multiplexer with a flat-top
pass band brings better transmission performances and enables error-free transmission
with a smaller pass band bandwidth. The transmission performance of the directly
modulated self-seeded RSOA is robust against the phase perturbation induced
by the micro change in the cavity length but is degraded remarkably when the
cavity length is extended to several kilometers. Nevertheless, error-free
transmission is achieved when the cavity length is extended to 4 km. The findings
of this paper provide a better understanding of the mechanism of the directly
modulated self-seeded RSOAs and also guidance on designing the WDM-PON systems
using the self-seeded RSOAs.
© 2013 IEEE
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