Abstract

Subchannel data updating of high-order modulation format signals using cascaded sum- and difference-frequency generation in a single periodically poled lithium niobate waveguide is demonstrated. One quadrature phase-shift-keying subchannel of a 16-quadrature amplitude modulation (QAM) signal at 40Gbit/s is successfully updated, with an optical signal-to-noise ratio (OSNR) penalty of 2dB for return-to-zero and 4dB for non-return-to-zero at a bit-error rate (BER) of 2×103. Simultaneous processing of four wavelength-multiplexed 16-QAM signals with an average OSNR penalty of 4.5 dB at a BER of 2×103 is also demonstrated.

© 2012 Optical Society of America

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