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 paper, the experimental results of frequency stabilization and injection-locking of high-power violet laser diodes were reported, where the master laser was stabilized with the Doppler-free saturated absorption signal of 174Yb atoms and the frequency stability was typically 62 kHz at a 1 s average time.
Abstract: We report the experimental results of frequency stabilization and injection-locking of high-power violet laser diodes. The frequency of the master laser was stabilized with the Doppler-free saturated absorption signal of 174Yb atoms and the frequency stability was typically 62 kHz at a 1 s average time. The slave laser having an output power of 25 mW exhibited a locking range of approximately 500 MHz under a 0.6 mW injection power. A heterodyne beat note at 160 MHz between the master and slave lasers revealed a 3 dB linewidth of less than 1 Hz limited by the measurement instrument.
29 citations
TL;DR: This paper presents a Wireless-USB/WiMedia-compliant fast-hopping frequency synthesizer architecture with quadrature outputs based on sub-harmonic injection-locking, which is the lowest power fast- Hopping quadratures frequency synthesizers that has been reported to date.
Abstract: This paper presents a Wireless-USB/WiMedia-compliant fast-hopping frequency synthesizer architecture with quadrature outputs based on sub-harmonic injection-locking. The synthesizer features a cross-coupled quadrature digitally-controlled oscillator, that is injection-locked to a sub-harmonic frequency. An intuitive closed-form expression for the dynamics of the quadrature injection-locked oscillator and a technique to achieve fast frequency-hopping, are presented. The overall architecture, based on this technique, is a CMOS-only implementation and has been fabricated in a 0.13-μm SiGe BiCMOS process. On-chip mixers have been implemented to measure the quadrature accuracy of the outputs. Measurement results indicate lock-times of less than 2.5 ns, a locked phase noise of -114 dBc/Hz at 1 MHz offset and a quadrature accuracy of better than 0.5°. The frequency synthesizer (excluding output buffers) occupies an area of 0.27 mm2 and consumes 14.5 mW of power. The best and worst case spur suppression achieved are 47 and 31 dB, respectively. This is the lowest power fast-hopping quadrature frequency synthesizer that has been reported to date.
29 citations
TL;DR: In this article, a push-pull MESFET at Ku-band has been designed and tested for sub-harmonic optically synchronized local oscillators in phase array.
Abstract: A MESFET push-pull oscillator at Ku-band has been designed and tested. This configuration demonstrated larger subharmonic injection locking range and lower FM noise without using a frequency stabilized dielectric resonator. This oscillator demonstrated significant potential for use in subharmonic optically synchronized local oscillators in phase array. >
29 citations
TL;DR: In this article, the authors describe relatively simple procedures permitting the control of a continuously tunable pulsed optical parametric oscillator with effective optical bandwidths ranging from more than 10 cm−1 to as low as 0.01 cm− 1.
Abstract: We describe relatively simple procedures permitting the control of a continuously tunable pulsed optical parametric oscillator with effective optical bandwidths ranging from more than 10 cm−1 to as low as ~0.01 cm−1. These techniques are surveyed, and their effectiveness is demonstrated in terms of a variety of atomic and molecular spectroscopic applications. Spatiospectral phenomena in the optical parametric oscillator output beam are found, with significant implications for spectroscopy at moderate resolution. For higher resolution, injection seeding of a passive ring-cavity optical parametric oscillator by a single-mode diode laser is shown to permit continuous tunability with effective spectroscopic bandwidths approaching the Fourier-transform limit.
28 citations
TL;DR: In this article, the nonlinear differential equation describing the receiver output is solved and explicit expressions obtained for the output signal, noise, and controlling second and third order distortions are presented for the case of a noise modulated FM input signal.
Abstract: The major components of an injection-locked-oscillator FM receiver are a linear mixer and a van der Pol type of negative resistance oscillator in a phase-locked configuration. In this paper the nonlinear differential equation describing the receiver output is solved and explicit expressions obtained for the output signal, noise, and controlling second and third order distortions. The input signal carrier is both amplitude and frequency modulated. Signal-to-distortion ratios have been computed and are presented for the case of a noise modulated FM input signal. The results indicate that excellent performance may be expected of such a receiver.
28 citations