We demonstrated optical filter characterization using optical frequency sweep with optical single sideband modulation technique, where the frequency shift range was 2GHz-10GHz. Undesired sidebands generated in the single sideband modulation due to electric phase errors can be compensated by automatic synchronized bias control. Fine pass band structures of a dual-section FBG were precisely measured, where the bandwidths of the pass bands were 440MHz.
We propose a high-yield fabrication processing technique for the MEMS (micro electro mechanical system) modulators integrated with two-dimensional photonic crystal waveguides. Polysilicon microactuators for evanescent modulation was successfully developed by using the vapor hydrofluoric-acid releasing technique for stiction-free sacrificial release, during which the SOI photonic-crystal waveguides were protected under the LPCVD silicon nitride film. Post-release anneal was found to be needed to remove the byproduct made by the reaction of hydrofluoric acid with silicon nitride film. Preliminary optical modulation result (-2dB modulation with 86V) was experimentally obtained.
A set of new analytical formulas is proposed for determining the geometric mean distance (GMD)for use in the Greenhouse method to calculate the inductances of three-dimensional inductors composed of on-chip interconnects. The expressions are derived using a graphical method based on the integral form of the GMD equation. The mutual inductances of coupled interconnects are computed for given layout geometries using the proposed formulas, even when the conductors are partially overlapped in different metal layers. The inductances computed using the formulas agreed well with those generated by an accurate commercial field solver, differing by less than 1% across a variety of the conductor geometries.
In this paper the new spectral method of the variable ordering in the Binary Decision Diagram (BDD) is introduced. The problem to find the best order is defined as NP-hard, and optimal solution can not be finding because optimizing algorithm is running in O(n!2n) time, and calculations can not be done for the large n. Such complexity was obviously improved in many algorithms but as will be demonstrated in this paper size of the BDD can be additionally reduced. Performed results with another representative methods have been compared.
A dispersion compensator consisting of a compact arrowhead arrayed-waveguide grating (AWG) with a dispersion-adjusting structure has been proposed. Dispersion parameters can be adjusted by filling lens-shaped deep trenches with refractive index-controlled resin. Dispersion compensators based on an 8ch, 12.5GHz-spacing AWG have been fabricated. The dispersion-adjusting structure consists of three double concave trenches located near the focal plane in a second slab waveguide. Dispersion compensators with total dispersions of 234ps/nm and 1103ps/nm were fabricated by using resins with refractive indices of 1.51 and 1.405, respectively.