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Pulse carving using nanocavity-enhanced nonlinear effects in photonic crystal Fano structures

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Abstract

We experimentally demonstrate the use of a photonic crystal Fano resonance for carving-out short pulses from long-duration input pulses. This is achieved by exploiting an asymmetric Fano resonance combined with carrier-induced nonlinear effects in a photonic crystal membrane structure. The use of a nanocavity concentrates the input field to a very small volume leading to an efficient nonlinear resonance shift that carves a short pulse out of the input pulse. Here, we demonstrate shortening of 500ps and 100ps long pulses to 30ps and 20ps pulses, respectively. Furthermore, we demonstrate error-free low duty cycle return-to-zero signal generation at 2 Gbit/s with energy consumption down to 1pJ/bit and power penalty of 2dB. The device physics and limitations are analyzed using nonlinear coupled-mode theory.

© 2018 Optical Society of America

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