Optical-Microwave Interactions in Semiconductor Devices.
Quarterly rept. no. 2, 1 Oct-31 Dec 78,
HUGHES RESEARCH LABS MALIBU CALIF
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The feasibility of achieveing optical injection locking of millimeter-wave IMPATT oscillators was investigated by calculating the efficiency of subharmonic optical injection locking of IMPATT oscillators. Calculations were carried out by adding a time-varying reverse saturation current term, which was generated by the incident optical signal, to the IMPATT avalanche equation. The results indicated that a locking range on the order of 100 MHz could be achieved for X-band IMPATT oscillators if modulated optical signal was converted into rf photocurrent efficiently. The injection-locking characteristics of X-band Si IMPATT oscillators were further investigated by measuring the locking range as a function of locking gain. Subharmonic locking was used with a frequency ratio ranging from 31 to 81. It was observed that a locking range of several megahertz was achievable with an oscillator at 8.11 GHz. It was also noted that even subharmonic locking was preferred over odd subharmonic locking for our oscillators.
- Lasers and Masers
- Solid State Physics