Wideband slow short-pulse propagation in one-thousand slantingly coupled L3 photonic crystal nanocavities

Coupled cavities have been used previously to realize on-chip low-dispersion slow-light waveguides, but the bandwidth was usually narrower than 10 rim and the total length was much shorter than 1 mm Here we report long (0.05-2.5 mm) slow-light coupled cavity waveguides formed by using 50, 200, and 1,000 L3 photonic crystal nanocavities with an optical volume smaller than (lambda/n)(3) slanted from F-K orientation. We demonstrate experimentally the formation of a single-mode wideband coupled cavity mode with a bandwidth of up to 32nm (4THz) in telecom C-band, generated from the ultra-narrow-band (similar to 300 MHz) fundamental mode of each L3 nanocavity, by controlling the cavity army orientation. Thanks to the ultrahigh-O nanocavity design, coupled cavity waveguides longer than 1 mm exhibited low loss and allowed time-of-flight dispersion measurement over a bandwidth up to 22 mu by propagating a short pulse over 1,000 coupled L3 nanocavities. The highly-dense slanted array of L3 nanocavity demonstrated unprecedentedly high cavity coupling among the nanocavities. The scheme we describe provides controllable planar dispersion-managed waveguides as an alternative to WI-based Waveguides on a photonic crystal chip. (C) 2018 Optical Society of America under the terms or the OSA Open Access Publishing Agreement