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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.


Papers
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Journal ArticleDOI
TL;DR: It is found that, because of coherence effects, adjustment of the cavity length for correct value of the equivalent Fresnel number can change the threshold power for frequency locking by at least 2 orders of magnitude.
Abstract: We report attaining a ratio of output to injected power as high as 108 in a KrF system, the limit being reached when injected power equals the noise per mode in the resonator. We find that, because of coherence effects, adjustment of the cavity length for correct value of the equivalent Fresnel number can change the threshold power for frequency locking by at least 2 orders of magnitude. The laser’s locked bandwidth is <0.1 A, and the line can be tuned over a range exceeding 10 A. The beam divergence is near (i.e., 1.5×) the diffraction limit.

31 citations

Journal ArticleDOI
TL;DR: A method that efficiently transfers the power from a single-frequency laser into a wideband frequency comb is demonstrated, which was produced by a 2.7-GHz electro-optic modulator in a resonant optical cavity.
Abstract: We have demonstrated a method that efficiently transfers the power from a single-frequency laser into a wideband frequency comb. The comb was produced by a 2.7-GHz electro-optic modulator in a resonant optical cavity. A coupled cavity technique was used to transfer 8.5% of the laser power into a comb with a span of 400 modes, or more than 1 THz.

31 citations

Journal ArticleDOI
TL;DR: In this paper, mutual injection locking of monolithically integrated distributed feedback (DFB) lasers is used to enhance the modulation characteristics of monolithic DFB lasers. And the authors show that the mutually injection-locked DFB laser exhibits reduced harmonics and third-order intermodulation distortion, and suppressed relative intensity noise near the relaxation oscillation frequency.
Abstract: Modulation characteristics enhancement by mutual injection locking of monolithically integrated distributed feedback (DFB) lasers is studied. Locking bistability in mutually coupled integrated lasers is observed. Resonance frequency as high as 34.3 GHz is recorded, corresponding to more than fivefold enhancement over the relaxation oscillation frequency at free running state. The mutually injection-locked lasers exhibit reduced harmonics and third-order intermodulation distortion, as well as suppressed relative intensity noise near the relaxation oscillation frequency. The spurious-free dynamic range is improved from 75 to 80 dB·Hz2/3. Furthermore, alleviation of chirp-induced power fading in analog optical links has been demonstrated. To our knowledge, this is the first time that suppressed nonlinear distortion and noise as well as chirp reduction are simultaneously demonstrated for monolithic mutually injection-locked DFB lasers.

31 citations

Journal ArticleDOI
TL;DR: In this article, a subharmonic injection-locked phase-locked loop (ILPLL) was proposed to improve the locking range of the MMIC by combining conventional injection-locking with an additional phase control loop.
Abstract: A new integrated W-band frequency source MMIC is presented which consists of a 94 GHz voltage-controlled oscillator (VCO) with large tuning range and a phase comparator, forming a subharmonic injection-locked phase-locked loop (ILPLL). The ILPLL combines conventional injection-locking with an additional phase control loop to improve the locking range of the oscillator significantly. The 4th subharmonic frequency is used as the reference signal. The locking range was increased from 80 MHz without ILPLL to 4.5 GHz with ILPLL by closing the loop with an external DC amplifier. A phase noise of -83 dBc/Hz at 100 kHz offset was achieved. Pseudomorphic GaAs HEMT's and a coplanar circuit topology were used to allow integration into complex single-chip subsystems and flip-chip packaging.

31 citations

Patent
22 Mar 2006
TL;DR: In this article, the LC resonant voltage control oscillators (20) were adopted as voltage controller oscillators for the purpose of providing a clock generating and distributing apparatus that can generate and distribute a clock signal of high precision even in a high-frequency region of several giga hertz or higher.
Abstract: LC resonant voltage control oscillators (20) are adopted as voltage control oscillators for the purpose of providing a clock generating and distributing apparatus that can generate and distribute a clock signal of high precision even in a high-frequency region of several giga hertz or higher, and of providing a distributive VCO-type clock generating and distributing apparatus in which voltage control oscillators (20) oscillate in the same phase, and which can generate a clock signal of a desired frequency and distributes a high-frequency clock signal to each part (91,92) within a chip more stably even in a high-frequency region reaching 20 GHz. Furthermore, an inductor component of a wire connecting the oscillation nodes of the oscillators (20) is made relatively small, or the LC resonant oscillators (20) are oscillated in synchronization by using injection locking, whereby the LC resonant voltage control oscillators (20) stably oscillate in the same phase.

31 citations


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