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Injection locking

About: Injection locking is a research topic. Over the lifetime, 4567 publications have been published within this topic receiving 60942 citations.


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Journal ArticleDOI
TL;DR: A Ka-band gyrotron backward-wave oscillator (gyro-BWO) experiment has been performed to investigate the phase control, fast tunability, and power capability, showing favorable scaling to still higher powers.
Abstract: A Ka-band gyrotron backward-wave oscillator (gyro-BWO) experiment has been performed to investigate the phase control, fast tunability, and power capability. Efficient injection locking was accomplished by novel circuit arrangements. Maximum power of 113 kW at -19% efficiency was achieved, showing favorable scaling to still higher powers. Stable voltage tuning bandwidth of 5% at 67 kW peak power was also observed. The measured performance has demonstrated a strong potential of the gyro-BWO for new applications requiring high-power tunable millimeter-wave sources

83 citations

Journal ArticleDOI
TL;DR: In this paper, a phase-noise analysis of a self-injection-locked GaAs MESFET oscillator operating at the X-band with delay cable loops is presented.
Abstract: Phase-noise analysis of the self-injection-locked oscillator is presented in this paper. The analysis is developed for different oscillator models and arbitrary self-injection feedback loops. The results are illustrated with specific cases of simple time-delay cable and a high-Q factor resonator. It is shown that the behavior of the phase noise is similar to an oscillator locked to an external low phase-noise source. The output phase noise can be reduced at the noise offset frequency near the carrier frequency, and returning to the free-running oscillator noise far from the carrier frequency for certain stable feedback delay ranges. The phase-noise reduction is affected by the self-injection signal strength and feedback transfer function for different oscillator equivalent-circuit models. The theory is verified by using a self-injection-locked GaAs MESFET oscillator operating at the X-band with delay cable loops. The self-injection-locked technique may be used to improve the phase noise of the existing oscillators.

83 citations

Journal ArticleDOI
01 Aug 1992
TL;DR: Optical techniques for microwave signal generation and optical control of microwave devices are described in this paper, where optical injection locking, phase control, and phase locking of microwave oscillators are also presented.
Abstract: Optical techniques for microwave signal generation and optical control of microwave devices are described. Optical generation of microwave signals to 35 GHz and above by coherent heterodyne was carried out by FM sideband injection locking of laser diodes and by offset frequency phase locking of solid state lasers. Applications of optically generated microwave signals including optical control of phased array radar and photodetector characterisation are discussed. Optical injection locking, phase control, and phase locking of microwave oscillators are also presented.

83 citations

Journal ArticleDOI
TL;DR: In this article, a comprehensive sustained oscillator model is used for the driven microwave cavity and phase locking is considered both for a case in which an oscillator is driven by an external signal without feedback, and for two coupled oscillators drive each other.
Abstract: Phase locking is considered both for a case in which an oscillator is driven by an external signal without feedback, and for a case in which two coupled oscillators drive each other. A comprehensive sustained oscillator model is used for the driven microwave cavity. The new locking conditions for two coupled oscillators show that phase locking can occur only when the connector contributes the zero or π phase delay. Temporal behavior is solved numerically. Calculations with large priming power agree with the experiments on a high‐power magnetron driven vircator in which there is no feedback to the magnetron. The mutual drive calculations also agree with the experiments on high‐power coupled magnetrons.

81 citations

Journal ArticleDOI
TL;DR: In this article, the spontaneous emission inside an injection-locked semiconductor laser does not alter the lasing field and the linewidth is only governed by the injected-field phase noise and may no longer follow the Schawlow Townes dependence on emitted optical power.
Abstract: We show that the spontaneous emission inside an injection-locked semiconductor laser does not alter the lasing field. For injection at the free-running frequency, the linewidth is only governed by the injected-field phase noise and may no longer follow the Schawlow-Townes dependence on emitted optical power.

81 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202333
202276
2021107
2020145
2019169
2018146