Controllability of group-velocity dispersion in semiconductor coupled-waveguide structures.
Controllability of group-velocity dispersion (GVD) associated with supermodes of InGaAsP/InP semiconductor coupled-waveguide structures that consist of two dissimilar waveguides was experimentally demonstrated by a change in the spacing between structures. Pulse broadening and pulse compression were conducted to compare the GVD of two coupled waveguides with different spacings. These measurements show that, as the spacing increases, the peak values of the GVD of the coupled waveguide also increase; in contrast, their spectral bandwidths narrow. This experimental result is consistent with the theoretical prediction.
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