Fine and Coarse Tunability over a Continuous 8.1-ns Delay Range with Access to Multiple Possible Delays using a Frequency Comb

A continuous delay range of 8.1 ns is achieved with simultaneous access to four different delays. Our system's penalty is ∼2 dB for a 10 Gbaud QPSK signal. We also add a HNLF to convert one of the delays to the original wavelength, adding ∼ 0.3 dB penalty.