We evaluated mutual inductances between two superconducting striplines coupled through a superconducting intermediate layer in Nb Josephson IC.In order to measure the mutual inductances we designed eight test circuits based on a superconducting quantum interference device (SQUID), which included intermediate layers of two different thicknesses and four different widths. The inductance extraction program FastHenry with superconductor support was used for numerical calculation. The experimental results agreed with the calculated results, both of which confirmed that a thicker and wider intermediate layer reduced the mutual coupling more efficiently.
Transmission characteristics of laterally illuminated photonic crystal fibers for both Γ-K and Γ-M directions are investigated. From the numerical results obtained, it is found that a stop band is formed in the transmission spectrum for TE modes and light illumination towards Γ-K direction, even though a photonic band gap (PBG) in Γ-K direction does not exist. Such a pseudo-PBG can be used for photonic crystal fiber sensing applications as well as a true PBG.
An analytical description of distortion-free transmission using time-domain optical Fourier transformation (OFT) is newly developed by using a time-domain ABCD matrix formalism. The analysis is based on an analogy with a spatial Fourier transformation in diffraction through lenses. The theory enables us to derive the pulse width and chirp at the OFT output explicitly and to evaluate the effect of dispersion inaccuracy in OFT by using only simple algebra.