Optical-Microwave Interactions in Semiconductor Devices.
Abstract
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 3:1 to 8:1. 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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1979
- Accession Number
- ADA064702
Entities
People
- Huan-wun Yen
- Luis Figueroa
Organizations
- HRL Laboratories