A novel 16-channel 50-GHz spacing interleaver for dense wavelength-division multiplexing (DWDM) systems has been realized using Ti:LiNbO₃ waveguides with the corrugated Si overlays. High refractive-index Si layer on LiNbO₃ waveguide enables a large index perturbation to strongly affect the mode index of the composite structure. The reflection spectra strength of each peaks and bandwidths of the individual channels are increased by interleaving several sampled gratings together. The modal characteristics have been analyzed by employing vectoric finite element method. The reflectivity has been obtained by formulating the transmission matrix of the structure. An odd-even channel separator with a gratings length of approximately 11 mm has been fabricated and its reflection spectrum has been measured. The -1-dB channel bandwidth is ≥ 0.2 nm and the sidelobes are < -20 dB.

Date Published: 30 April 2004
PDF: 4 pages
Proc. SPIE 5279, Optical Fibers and Passive Components, (30 April 2004); doi: 10.1117/12.521471

Published in SPIE Proceedings Vol. 5279:
Optical Fibers and Passive Components
Steven Shen; Shuisheng Jian; Katsunari Okamoto; Kenneth L. Walker, Editor(s)