Tunable 105 ns optical delay for 80 Gb/s RZ-DQPSK, 40 Gb/s RZ-DPSK, and 40 Gb/s RZ-OOK signals using wavelength conversion and chromatic dispersion.

We demonstrate a variable, optical-delay element using tunable wavelength conversion in a periodically poled lithium niobate waveguide, dispersion-compensating fiber and intrachannel dispersion compensation. A delay of up to $105\mathrm{ns}$ is demonstrated using $80\mathrm{Gb}∕\mathrm{s}$ return-to-zero differential-quadrature phase-shift keying, $40\mathrm{Gb}∕\mathrm{s}$ return-to-zero differential phase-shift keying, and $40\mathrm{Gb}∕\mathrm{s}$ return-to-zero on–off keying modulation formats. Bit-error rates $<{10}^{-9}$ are demonstrated for each waveform at various delay settings.