Abstract
We experimentally demonstrate multicasting operation of a 16QAM signal, by
simultaneously generating multiple copies of the signal through optical wavelength
conversion in a single periodically-poled Lithium Niobate (PPLN) waveguide. The
simultaneous conversion of the signal on multiple wavelengths is based on the cascade of
sum frequency generation and difference frequency generation second order nonlinear
effects taking place in the PPLN. Each conversion is potentially tunable in the whole
C-band and polarization independent operation is achieved by embedding the PPLN in a
polarization diversity scheme. A first experiment reports a 3-fold wavelength conversion
of a single polarization 112 Gb/s 16QAM signal. Both DFB lasers and ECLs are used to
generate the optical pump signals employed in the scheme; the impact of different phase
noise amounts induced by the pumps on the BER curve behavior is also discussed and
numerically verified. A second experiment reports a 2-fold wavelength conversion of a
224 Gb/s polarization-multiplexed (PM)-16QAM signal, thus confirming the correct
operation for PM signals. At last, the multicasting operation on the PM-16QAM signal is
successfully employed in a WDM metro network scenario.
© 2013 IEEE
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