Topic
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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TL;DR: In this article, the effects of a delayed optoelectronic feedback loop on the stability of an optically injected diode laser were investigated, in particular, negative feedback configurations (out-of-phase carrier reinjection) widened the injection-locking domain and reduced its unstable region.
Abstract: Optical injection and optoelectronic feedback are efficient techniques to externally control the spectral characteristics of a semiconductor laser. This paper presents theoretical and experimental results about the effects of a delayed optoelectronic feedback loop on the stability of an optically injected diode laser. In particular, negative feedback configurations (out-of-phase carrier reinjection) are shown to widen the injection-locking domain of the laser and reduce its unstable region. On the contrary, in positive feedback configurations (in-phase carrier reinjection), the laser diode generates a modulation with tunable multigigahertz frequency.
57 citations
TL;DR: In this paper, the authors demonstrated that the output of a 2.45 GHz magnetron operated as a current-controlled oscillator through its pushing characteristic can lock to injection signals in times of the order of 100-500 ns depending on injection power, magnetron heater power, load impedance, and frequency offset of the injection frequency from the natural frequency of the magnetron.
Abstract: It is demonstrated that the output of a 2.45-GHz magnetron operated as a current-controlled oscillator through its pushing characteristic can lock to injection signals in times of the order of 100-500 ns depending on injection power, magnetron heater power, load impedance, and frequency offset of the injection frequency from the natural frequency of the magnetron. Accordingly, the magnetron can follow frequency and phase modulations of the injection signal, behaving as a narrow-band amplifier. The transmission of phase-shift-keyed data at 2 Mb/s has been achieved. Measurements of the frequency response and anode current after a switch of phase as a function of average anode current and heater power give new insight into the locking mechanisms and the noise characteristics of magnetrons
56 citations
TL;DR: In this article, a very low phase-noise planar X-band oscillator employing an active resonator has been demonstrated, operating at 8 GHz, with a measured phase noise of -150 dBc/Hz at 1-MHz frequency offset with 10-dBm output power.
Abstract: A very low phase-noise planar X -band oscillator employing an active resonator has been demonstrated. The high frequency selectivity of the active filter, used as the resonator, is the key factor in phase-noise reduction. A design procedure to achieve the resonator's optimum performance for low phase-noise applications is presented. In particular, the effect of the excess noise introduced by the active filter is addressed and its impact on the oscillator's phase noise is minimized. The oscillator, operating at 8 GHz, shows a measured phase noise of -150 dBc/Hz at 1-MHz frequency offset with 10-dBm output power. To the best of our knowledge, this oscillator demonstrates the lowest phase noise among published X -band planar oscillators to date.
56 citations
TL;DR: In this paper, a 40-element AlGaAs array emitting 510 mW cw is obtained by external injection locking, with 11.0 mW of injected power incident on the array.
Abstract: Near‐diffraction‐limited (0.13° wide) single‐lobe operation of a 40‐element AlGaAs array emitting 510 mW cw is obtained by external injection locking, with 11.0 mW of injected power incident on the array. The injected and the array output beams were tilted relative to the facet normal to allow for spatial separation of the two beams and efficient coupling into a single‐mode fiber; 150 mW was coupled into a 5‐μm core, polarization holding fiber.
56 citations
01 Sep 2006
TL;DR: Using the hard-limiting characteristics of transconductors, a new model for injection-locking, applicable for any strong and weak injection, is proposed, backed by simulations that show the powerfulness of this new model.
Abstract: Using the hard-limiting characteristics of transconductors, a new model for injection-locking, applicable for any strong and weak injection, is proposed. Backed by simulations, examples of the powerfulness of this new model are enumerated as proof of the concept.
56 citations