COUPLING OF OPTICAL FIBRES BY MEANS OF VOLUME HOLOGRAMS M. P. Jordan, R. Kompfner, C. J. R. Sheppard and L. Solymar Abstract Two holographic couplers capable of coupling to each other two bundles of optical fibres are discussed. The analysis follows Kogelnik's method /1/ of deriving coupled differential equations inside the holographic medium. The arising partial differential equations a

OPEN SEMICONDUCTOR WAVEGUIDE FOR MILLIMETER WAVE APPLICATION R. Karg, H. Ermert, H. Brand, G. Appelhans ABSTRACT A rectangular cally dielectric semiconductor waveguide is theoretimethods. material Depending effect In an is on is investigated by transverse mode matching experiment changed guide the resistivity of the semiconductor a GaAs laser beam. by illuminating with the config



Ti : LiNb03 ELECTROOPTICAL ACTIVE COMPONENTS FOR INTEGRATED OPTICS M. PAPUCHON In this paper we shall present the results obtained at ThomsonCSF in the. realization of active electrooptical components using the diffusion of Titanium in LiNbQ3 Crystals. We shall discuss in details the switching problem and in particular the conditions required to obtain good switching efficiency and the diff

RF POWER SOLID STATE AMPLIFIERS FOR MICROWAVE RADIO (~) A. FAOTTO ABSTRACT In this developed bed. The systems ements paper main are solid state microwave of these with power "division amplifiers, link which have been by GTE Telecomunicazioni advantages considered, power. by using microwave for radio equipments, are descri= amplifier efficiency improv= and multiplication" the high refe

LINEARIZATION OF L-BAND POWER TRANSISTOR AMPLIFIERS TO BE SIGNAL USED WITH A MULTICARRIER * By S.A. PADOVANI, P.L. FAJA * ABSTRACT Two linearization methods: -Feed-back loop -Forward bias of base emitter junction are used in the design of L-Band linear amplifiers for multi carrier operation in view of achieving C/I figures in the ran ge of 24 dB to 26 dB without significant sacrifice of the e

A 14GHz 2kW KLYSTRON FOR EARTH STATIONS OF BROADCASTING SATELLITE SYSTEMS Shigemoto MURATA*, Kaizo YAMAMOTO*, Takayoshi SHINOZAKlt, and Hisaaki SATOt ABSTRACT A klystron has been developed as a transmitting tube for earth stations of transportable or mobile type. The klystron, rather than the TWT, was chosen to make the transmitter compact. It has five cavities and mechanical pre-set tune

THE EFFECT OF RAIN ON ECHOES IN THE VICINITY OF mm-PULSE Werner RADARS Wiesbeck ABSTRACT In recent years the development of mm-wave pulse radars was pushed forward very rapidly. It can be shown that precipitation echoes, the main interference source, cannot be computed from the well-known formula for weather radars in which a conical energy distribution is assumed. It is necessary to appr

A METHOD TO REDUCE SYSTEMS (MLS) THE NEED FOR LARGE ANTENNAS IN MICROWAVE LANDING B. Forssell * ABSTRACT The replacement of the present Instrument Landing System (ILS) by the new Microwave Landing System (MLS) which is supposed to begin about 1980 is caused by increasing requirements for capacity, accuracy and coverage which ILS cannot meet. The increased accuracy is largely achieved by th

SURFACE ROUGHNESS MEASUREMENTS FM-CW RADAR ALTIMETERS BY USING LOW-RESOLUTION Sune R.J .Axelsson ABSTRACT When a radar altimeter is used over added to the output signal. The mean range spread of the reflectors located ship between noise and range spread roughnesses by low-resolution radar favorably with theoretical predictions. a rough ground surface, a noise component is deviation of the noise