Abstract
This paper investigates balanced detection schemes for
optical duobinary communication systems, and compares duobinary with differential
phase-shift keying (DPSK) modulation. The balanced detection schemes are evaluated
in duobinary and DPSK systems limited by amplified spontaneous emission noise,
narrow optical filtering, and chromatic dispersion. We also consider the optimization
of duobinary generating low-pass filter. Experimental data at 10 Gb/s show
that balanced detection yields a significant advantage in receiver sensitivity
compared with direct detection for duobinary systems, allowing duobinary systems
to approach within ${\sim}
{\hbox {1.5}}$ dB the performance of DPSK. We also employ
Monte Carlo simulations to evaluate balanced detection for 40 Gb/s duobinary
transmission systems with narrow optical filtering designed for 50 GHz channel
spacing. The simulations confirm our experimental results, and provide a more
general investigation of balanced detection schemes. In particular, we propose
a novel balanced detection scheme for duobinary systems designed to improve
the tolerance to narrow optical filtering.
© 2011 IEEE
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