1.16 µs continuously tunable optical delay of a 100-Gb/s DQPSK signal using wavelength conversion and chromatic dispersion in an HNLF

We demonstrate a tunable optical delay element using wavelength conversion in a highly nonlinear fiber, dispersion compensating fiber, and optical phase conjugation. A continuous delay of up to 1.16-μs equaling >55,000 symbols at 50 Gb/s, for 100 Gb/s NRZ-DQPSK and 50 Gb/s NRZ-DPSK modulation formats, is demonstrated.