SOLID-STATE TECHNIQUES FOR MODULATION AND DEMODULATION OF OPTICAL WAVES.
Quarterly progress rept. no. 6, 1 Oct-31 Dec 64,
TEXAS INSTRUMENTS INC DALLAS
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MODULATION Some considerations were made as to the configurations best suited for wide bandwidth light modulation using KTN. A configuration of special interest is one which takes advantage of the very low speed of propagation and hence very short wavelengths of microwave excitation in KTN. The use of KDP in traveling wave configurations is discussed. An experimental modulator is described. A 45 degree Z-cut KDP modulator was tested for its optical quality and found to be very nearly diffraction-limited. DEMODULATION Recent experimental studies have suggested a particular photodiode structure which will yield microplasma free uniform bulk breakdown. The structure showing the most promise for microplasma free multiplication is the planar NP pi P structure. It is concluded that a well made diode at avalanche will always be photon shotnoise limited rather than thermal noise limited even at very low light levels. MODULATORDEMODULATOR SYSTEMS A short discussion is given as to the conditions relating to television picture quality as transmitted, in the VHF region, over a laser beam. Examples of the kind of reception obtained are shown.