THE DEVELOPMENT OF CIRCULAR WAVEGUIDE TEgN MODE FILTERS I.L. Powell, * B.K. Watson*, and J. Weale* R. A. Waldront *GEC-Marconi Electronics Ltd., Marconi Research Loboratories, Great Baddow, Chelmsford, Essex, U.K. tDirector of Studies, Ulster College, The Northern Ireland Polytechnic, Jordanstown, Co. Antrim, N. Ireland. ABSTRACT Unwanted circularly symmetric modes of the TEON family are generat

APPROXIMATE SYNTHESIS OF TEM MODE TRANSMISSION-TYPE DIRECTIONAL FILTERS J.L.B. Walker ABSTRACT An approximate synthesis technique is described for TEM mode transmission-type directional filters for which only a hand-held electronic calculator is required to compute the element values. In the example given the element values differ by less than 1.5% from the values calculated by an exact techniq

EXACT EFFICIENCY EVALUATION IN LOADED DIFFUSED OPTICAL WAVEGUIDE MODULATORS V.Andresciani, M.N.Armenise, M.De Sario ABSTRACT In this tric crystal sion method. in the first the second paper, we consider in order The multilayer the optical film is parallel. spacing an overlayed structure cases erfc diffused LiNbO to design axis a planar-type modulator by the mode 3 ferroelecconver- is a

THE THEORY FOR THE DIELECTRIC LASERS SLAB WAVEGUIDE WITH COMPLEX REFRACTIVE INDEX APPLIill TO GaAs Jens Buus * ABSTRACT In this paper we investigate the homogeneous dielectric slab waveguide in the case of complex dielectric constants. A method for calculating the field distribution in a dielectric waveguide with an arbitrary symmetrical variation in the refractive index is developed, and

EXPERIMENTAL PULSE AND THEORETICAL I i INVESTIGATION INDEX FIBERS OF SUBNANOSECOND PROPAGATION:IN GRADED E. Nicolaisen* and J.J. Ramskov Hansen* ABSTRACT The propagation in a fibre which does not exhibit any mode coupling is investigated by varying the launching conditions. It is shown that for this fibre there exists a trade-off between dispersion and power coupling efficiency. The meas

OPTICAL GUIDING STRUCTURES BY ION-EXCHANGE J .G. GALLAGHER, I. ANDERSON, R.N. DE LA RUE ABSTRACT Singla-mode stripe and branching optical waveguide structures have been formed by silver ion-exchange techniques. The measured power transmission of a single-mode Y-junction is compared with a predicted value obtained from an approximate analysis. 

LEAKAGE OPTICAL S. T. Peng AND RESONANCE AND MILliMETER and A. A. Oliner EFFECTS WAVES ON GUIDING STRUCTURES FOR ABSTRACT Several interesting guiding structures, which utilize dielectric strips, have been proposed during the past few years for use in optical and millimeter wave integrated circuits. The sides of these strips create TE-TM coupling which has so far been neglected in published a

FIBRE OPTIC COMMUNICATION SYSTEMS C.P. Sandbank* ABSTRACT The basic requirements for practical optical communication systems are reviewed. The construction and performance of some of the key constituents such as the fibre, cable, sources, connectors and splices are discussed. Particular emphasis is placed on the special properties of optical communication systems such as the economic advanta

RELIABILITY AND OPERATING EXPERIENCE OF THE LAMPF 805-~~Z RF SYSTEM* Paul J. Tallerico ABSTRACT and modulators The 1-1/4 MWklystrons, the floating-deck modulators and the modulator triodes are described. The operating data are summarized and the fault and failure modes are tabulated for the three major components of the system. The high-voltage processing and other maintenance required to keep

THEORETICAL AND EXPERIMENTAL ATTENUATION OF THE OPEN RING LINE ~ C. Fray, A. Papiernik ABSTRACT The dispersion curve and attenuation constant of the open ring line operating in the fundamental dipolar mode is discussed and this line is shown to be a low loss structure. Measurements on a line consisting of equally spaced rings of an aluminium-alloy held by a metallic rod agree with theory. T