Abstract
A delay line consisting of a balanced side-coupled integrated spaced sequence of resonators and phase change material ${{\rm VO}_2}$ films is employed to realize continuously tunable delays with ultrafast response and low distortion. Simulation results show that a tunable delay of up to 80 ps with a 10% broadening, 150 GHz bandwidth, and 0.087 dB/ps delay loss is achieved from this structure. Taking advantage of photoinduced phase transition of ${{\rm VO}_2}$ films, this device obtains a switching time of less than 0.6 ps and effective compensation for group delay dispersion. This delay line shows advantages in the high-bit-rate all-optical processing systems.
© 2021 Optical Society of America
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