Abstract
An incoherent detection scheme based on frequency discrimination for
minimum-shift keying (MSK) optical transmission systems is proposed to significantly
extend the reach of uncompensated transmission distance. The receiver consists
of dual narrowband optical filters in association with an optical delay line.
This photonic front end operates based on frequency discrimination principles
of matched filters, rather than relying on the phase of the optical carrier.
Hence, its performance is less sensitive to the all-pass quadratic phase transfer
function of the fiber transmission medium and is thus less susceptible to
fiber chromatic dispersion. The photonic front-end optical receiver for 40-Gb/s
optical MSK offers a dispersion tolerance of up to $\pm$340 ps/nm for 1-dB power penalty at a bit-error
rate of $10^{-9}$. This
achievement is approximately five to seven times better than that of the existing
value based on the Mach–Zehnder delay interferometer (MZDI) optical
balanced receiver. Furthermore, the receiver is shown to be robust to polarization-mode
dispersion.
© 2008 IEEE
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