Accession Number : ADA185250

Title :   Optically Tuned MM-Wave IMPATT Source.

Descriptive Note : Final rept.,

Corporate Author : MARCONI ELECTRONIC DEVICES LTD LINCOLN (ENGLAND)

Personal Author(s) : Williams, D A

PDF Url : ADA185250

Report Date : Jul 1987

Pagination or Media Count : 81

Abstract : The analytic theory of optical tuning in IMPATT oscillators developed in the initial phase of the work has been extended and generalised. Accuracy of the theory in predicting tuning at the higher oscillator voltage swings has been greatly improved by reformulating the Bessel function series used to express avalanche gain. A model for optical injection locking, where the oscillator output is locked to a microwave intensity modulated optical signal, has also been developed. The computer model for optical control has been modified to study the tuning behaviour of Ku-Band IMPATTs, as used in the recent experimental work. Work on optical tuning speed studies has also been extended. The experimental program has produced a number of developments. A delay line discriminator has been used to measure the tuning speed in response to a step change in illumination level. It has been found that a frequency shift of 1.4mhz at W-Band could be achieved in less than 20ns and a frequency shift of 5.6MHz at Ka-Band in less than 10ns.

Descriptors :   *IMPATT DIODES, *MICROWAVE OSCILLATORS, *LASER BEAMS, *TUNING DEVICES, BESSEL FUNCTIONS, KU BAND, DELAY LINES, THEORY, QUICK REACTION

Subject Categories : Electrical and Electronic Equipment
      Lasers and Masers

Distribution Statement : APPROVED FOR PUBLIC RELEASE