Abstract
We mathematically analyze and experimentally investigate the characteristics
of subcarrier-modulated (SCM) light. Our investigation shows that the baseband
data are also carried on the optical carrier after subcarrier modulation.
This residual data introduce crosstalk when the optical carrier is separated
from subcarriers and reused for uplink data modulation. The influence of the
residual data carried on the optical carrier is studied in three kinds of
upstream transmissions based on wavelength-seeded reflective semiconductor
optical amplifiers (RSOAs) for carrier-reuse wavelength-division-multiplexed–passive
optical networks (WDM-PONs). Results show that the crosstalk can be significantly
suppressed with proper selection of the seeding power and operation conditions
of downlink Mach–Zehnder modulator (MZM), including driving voltage
and bias voltage.
© 2009 IEEE
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