Results are presented for analytical computer modelling and experimental studies of optically induced frequency tuning of W-Band (75-110 GHz) impatt oscillators. Predictions from an analytical theory are compared with those from a large-signal time-domain computer model, and the effect of unequal electron and hole ionisation coefficients on the tuning performance is illustrated. Experimental measurements are presented showing an optical tuning range of about 10 MHz for an optically generated current of 20 jiA, and comparisons are made with the theoretical predictions.
This paper describes methods of controlling the frequency of IMPATT oscillators using optical rather than electrical signals. Analytic theories of optical tuning and injection locking are presented. Results from a comprehensive large signal computer model of the optically controlled IMPATT oscillator are given, illustrating the importance of the composition of the optically generated current on the optical control performance and demonstrating the capability of optical control for rapid frequency tuning. Finally, recent experimental work on optical tuning effects in W-Band IMPATT oscillators is presented.
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