Optically Tuned MM-Wave IMPATT Source.
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1987
- Accession Number
- ADA185250
Entities
People
- D. A. Williams