TWO DIMENSIONAL -GEOMETRY LASER ANALYSIS OF THE GaAs DOUBLE HETERO STRIPE- T. Rozzi+and T. Itoh* ABSTRACT The GaAlAs/GaAs stripe-geometry laser is analyzed using a new technique called the effective dielectric constant (EDC) method. Unlike previously reported techniques, use of the EDC method allows both vertical and sideward directions in the cross section of the laser to be taken into ac

P1W£~ ASSOCIATED WI'lH LONG PAI!H COMMllNICATluN LINKS IN TROPICAL AliEAS. V.T.V. Sbarma.* ABSTRACT Southern Railway have collected extensive data on microwave propagation over their 2000 KM net-work for over five years. The main problem of long path communication link is the occurrence of momentary deep fades of 10 to 40 dB for very short duration of 1 to 2 seconds. These dropout. account fo



AN ECONOMICAL CHANNELS Erik Myr seth MICROWAVE LINK SYSTEM FOR 2700 TELEPHONE ABSTRAC T This system, carrying 2700 telephone channels band, meets all relevant CCIR recommendations. per carrier in the 6 GHz Key features include easy maintenance during operation, all solid state except for the very high efficiency TWT, 300 channels insert. Computer aided design of SHF and IF filters and cir

A MODULAR FREQUENCY Philippe MULTIPLEXER BANDS ~ WITH OPERATING TWO LINEAR EACH SIMULTANEOUSLY ORTHOGONAL IN FOUR ~ Nhu BUI-HAI POLARIZATION MAGNE ABSTRACT A multiplexer using quasi-optical filters, directional couplers, Tchebischeff and Butterworth filters and orthomode transducer, can operate simultaneously in four CCIR frequency bands for Microwave links: - One half 3.6 - 4.2 GHz frequen

DETECTION OF CPSK WITH TIMING AND SIGNALS JITTER IN NONLINEAR RECEIVERS PHASE ( 1 ) S.BENEDETTO, E.BIGLIERI ABSTRACT This PSK for system noise paper when describes besides a technique the effects instant for evaluating the performance interference device phase. of a of intersymbol including and carrier general and Gaussian and circuits allows the combi in the we must consider the a rec

A NOVE"L FM DETECTOR INTERFERENCE FOR SUPPRESSION OF INTERCHANNEL T. S. Sundresh *, F. A. Cassara, ABSTRACT + and H. Schachter + In this paper a novel FM detector capable of suppressing the degradation in receiver performance due to the presence of an interfering signal is presented. This novel detector consists of two phase-locked loop FM demodulators interconnected in such a manner to per

11 AND 15 GHz PCM RADIO-RELAY SYSTEMS Kohei Nishino*, Akira Hosoda*, Shoji Kubo*, Tadashi Mukai* ABSTRACT This paper describes the 11 GHz and 15 GHz PCM radio relay systems, capable of conveying 65 Mb/s per radio channel, developed by Nippon Telegraph and Telephone Public Corporation NTT). The system employs 4-phase digital modulation and coherent detection. Radio equipment is fully sol

SELF-IMAGING BY PHASE COINCIDENCES IN RECTANGULAR DIELECTRIC WAVEGUIDES E. VogesX and R. Ulrichxx ABSTRACT The imaging properties of multimode dielectric waveguides of rectangular cross-section, having a homogeneous refractive index nf' are investigated theoretically and experimentally. Two-dimensional self-images are formed by the phase coincidences of a large number of modes if the effecti

INTEGRATED OPTICAL MICROSTRUCTURES EXAMINATION BY FLUORESCENCE A.M. ROY ABSTRACT In this paper we shall review a method permitting the observation of optical fields propagating in microstructures for integrated optics. This method is based on the observation of the fluorescence emitted by a thin plastic film deposited upon the structure to be examined. Some results concerning the observation o