Abstract

A colorless all-optical scheme performing the subtraction and addition of phases between phase-shift keying (PSK) signals exploiting cascaded sum and difference frequency generation in a periodically poled lithium niobate waveguide is introduced and experimentally demonstrated. The subtraction of phases of two $40\mathrm{Gb}/\mathrm{s}$ differential quadrature PSK signals has been experimentally tested and performances have been analyzed in terms of bit error rate measurements.

© 2012 Optical Society of America

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