For an incident plane wave, an exact solution of the moment equation is found in a special case where the correlation function B(r,z) of the fluctuating part of the relative dielectric constant can be approximately expressed as B(r,z)a₀(z)+a₂(z)r²+a₄(z)r⁴, r²x²+y²; and the perturbation solution is obtained in the general case B(r,z)a₀(z)+a₂(z)r²+a₄(z)r⁴+. The two solutions indicate that the r⁴ term in B(r, z) produces the log-normal distribution and the complete correlation of the intensity and that the higher term than r⁴ yields both declines of them. The perturbation solution shows that the condition for validity of the special case is B(0, 0)(L/l)³1, (L/l)kl, and r_m-r_nl, m, n1v, where k is the wave number in free space, l is the correlation length of the medium fluctuation, L is the range between the transmitting place (z0) and the receiving plane (zL), and r_m, r_n denote the observation positions on the receiving plane.

The transfer function of optical fibre is now more frequently being specified in terms of frequency response. While measuring the amplitude over frequencies up to several GHz is quite straightforward, determining the phase response presents difficulties. This paper examines the nature of the practical problems associated with measuring the differential phase across a long fiber and shows how they can be overcome. A measurement system is described which performs the required measurements easily and quickly with a minimum of samples. Some results are given for 900 m of fibre over the range 25 to 1250 MHz and using these the capability of the system is compared with a time domain measurement. The frequency domain technique appears to be the superior method.

Iterative patterns can be described by the component pattern of iteration, the shape of which may usually involve the way of its connection for the iteration. Based on a parallel translation group for each iterative pattern, it is shown that the shape of component pattern can be a rectangle for any iterative pattern, which is called a tile and is related to the basis of parallel translation group. And it is shown that the component pattern can be identified by a tessera" which is defined by a non-degenerate colored tile. Thus the tessera may be said to be a compact description of iterative patterns. Some properties of tesseras and tiles are also discussed. The number of tesseras with a tile is evaluated, which means that the number of distinct iterative patterns for each shape of component patterns is enumerated.

The structural design of a glazed alumina substrate for use in a hybrid IC repeater in the CS-36M submarine cable system is studied. The thickness of the alumina substrate, the thickness of the glaze, and the thermal expansion coefficient of the glass used for the glaze, are theoretically determine for the large (110 mm in diameter) substrate in terms of the load stress when the repeater is installed, the thermal strain when the glaze is formed, and displacement due to lateral pressure. It is found that the desirable thickness of the alumina substrate is approximately 2 mm, the desirable glaze thickness is approximately 65 µm, and the desirable thermal expansion coefficient is (7.77.5)10^-6-1. A glazed alumina substrate is fabricated on the basis of these structural design parameters, and it is subjected to the mechanical strength test and form test prescribed for the CS-36M submarine cable system. The results prove that the substrate has sufficient mechanical strength and that there is no deformation problem. The glazed alumina substrate developed in this study is applied in a repeater used in the CS-36M submarine cable system and it contributes to the very high reliability of the repeater.

Modal noise in a quasi-single mode fiber propagating a few LP mode is studied experimentally by simulating lossy connectors and imperfectly coupled detectors. The signal-to-noise ratio of the so called two-mode fiber is found to be high as in the usual multimode fiber.

The finite-element solutions of the discontinuity problems in a dielectric slab waveguide bounded by perfect electric or magnetic conductors are examined numerically and it is confirmed that the finite-element formulation for the bounded configuration facilitates solving the discontinuity problems in an open surface waveguide by placing the bounds appropriately away from the guiding surface.

It is known that psychotropic compounds give change to evoked response of human. A system for the Auditory Brain Stem Response (ABR) was experimentally developed, and ABR of subjects in general anesthesia were measured for the purpose of assessing the depth of anesthesia.

Cardiac output can be measured from the rate of absorption of soluble inert gas across the lung using an electric model of human body suggested by W. Mapleson. Step response of the model becomes the sum of exponentials. Cardiac output is estimated from time constants and amplitude coefficients of the response. System for the measurement of the cardiac output which is based on this theory will be introduced below.

We extend the position angle in the two-conductor transmission line to the position angle matrix in the multiconductor lines. The position angle matrix is applied to analysis of cascaded transmission lines, so that the relationship of the voltage vectors (or the current vectors, or the impedance matrices) between two different points on the line can be expressed in the compact form by using the position angle matrices.