Abstract
Simultaneous all-optical wavelength conversion of an 80-Gb/s return-to-zero
differential quadrature phase shift keying (RZ-DQPSK) data signal and a 40-Gb/s
return-to-zero ON--OFF keying (RZ-OOK) data signal using a Ti:PPLN waveguide
in a polarization-diversity loop configuration are demonstrated. The wavelength
conversion is fully transparent to polarization, data rate, modulation format,
and modulation level. The conversion efficiency for the signals was ${-}21$ dB, which
includes 9.2-dB passive losses in the whole Ti:PPLN subsystem. Error-free
performance for both wavelength-converted signals was achieved for polarization-scrambled
input data signals without additional penalty caused by the polarization scrambling.
© 2011 IEEE
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