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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: In this paper, the authors present detailed numerical simulations of the laser dynamics that describe optical frequency comb formation by injection-locking a gain-switched laser, and they show that the locking range for gain switched lasers is considerably greater because injection locking can be achieved by injecting at frequencies close to one of the comb lines.
Abstract: We present detailed numerical simulations of the laser dynamics that describe optical frequency comb formation by injection-locking a gain-switched laser. The typical rate equations for semiconductor lasers including stochastic carrier recombination and spontaneous emission suffice to show the injection-locking behavior of gain switched lasers, and we show how the optical frequency comb evolves starting from the free-running state, right through the final injection-locked state. Unlike the locking of continuous wave lasers, we show that the locking range for gain switched lasers is considerably greater because injection locking can be achieved by injecting at frequencies close to one of the comb lines. The quality of the comb lines is formally assessed by calculating the frequency modulation (FM)-noise spectral density and we show that under injection-locking conditions the FM-noise spectral density of the comb lines tend to that of the maser laser.

23 citations

Journal ArticleDOI
TL;DR: In this paper, a symmetric ultra-wideband (UWB) over wavelength-division-multiplexing passive optical network based on injection locking of a Fabry-Perot laser diode (FP-LD) and polarization multiplexing is proposed and experimentally demonstrated.
Abstract: Wavelength reuse in a symmetric ultra-wideband (UWB) over wavelength-division-multiplexing passive optical network based on injection locking of a Fabry-Perot laser diode (FP-LD) and polarization multiplexing is proposed and experimentally demonstrated. In the proposed scheme, the downstream UWB signal and baseband signal are generated and polarization multiplexed in the central station and sent to a base station (BS) over an optical fiber. At the BS, one of the downstream signals is selected to injection lock the FP-LD. It is demonstrated theoretically and experimentally that the upstream service performance is less sensitive to the modulation depth of the downstream UWB signal than the baseband signal, and the use of the downstream UWB signal as the injection signal would contribute to a better transmission performance for both the downstream and upstream services. Thus, the downstream UWB signal is selected as the injection signal. An experiment is performed. When the FP-LD is injection locked by a downstream UWB signal, a clear optical carrier is generated which is reused for upstream UWB and baseband transmission. A bidirectional point-to-point transmission of 1.25 Gb/s UWB signal and 10 Gb/s baseband signal over 25-km single-mode fiber using a single wavelength is demonstrated. The bit error rate performances and the eye diagrams for both downstream and upstream transmissions are measured.

23 citations

Journal ArticleDOI
TL;DR: In this paper, the voltage of a current-driven optically injected semiconductor laser has been measured and the dispersive-like structures around the relaxation oscillation frequencies were shown to be caused by four wave mixing.
Abstract: The voltage of a current-driven optically injected semiconductor laser has been measured. The experiments not only show the well known phenomenon of injection locking but also reveal unprecedented dispersive-like structures around the relaxation oscillation frequencies. Based on the single-mode rate equations a theoretical explanation of both phenomena is given. The dispersive-like structures are shown to be caused by four wave mixing.

23 citations

Journal ArticleDOI
TL;DR: In this article, the authors describe a phase-locked loop (PLL) architecture utilizing an optoelectronic oscillator (OEO) as a voltage-controlled oscillator, which demonstrates excellent far-out phasenoise performance while the PLL reduces the close-in phase noise.
Abstract: This paper describes a novel phase-locked loop (PLL) architecture utilizing an optoelectronic oscillator (OEO) as a voltage-controlled oscillator (VCO). The OEO demonstrates excellent far-out phase-noise performance while the PLL reduces the close-in phase noise. The nonmonotonic VCO characteristics of the OEO placed stringent demands on the loop filter electronics and startup conditions. The crystal reference, prescalar, frequency synthesizer, and loop filter were all implemented with discrete high-performance components. The resulting frequency synthesizer yields a $-$ 10-dBm output at 20 GHz with phase noise of $-$ 80 dBc/Hz at 100-Hz offset, and $-$ 134 dBc/Hz at 10-kHz offset. These results are far superior to PLL synthesizers utilizing only an electronic VCO and illustrate the power of optoelectronic integration.

23 citations

Journal ArticleDOI
TL;DR: A novel technique is demonstrated that allows effective homodyne optical phase locking to a phase shift keying (PSK) signal with a residual carrier, with no penalty compared to back-to-back at a bit error ratio of 10(-3).
Abstract: We demonstrate a novel technique that allows effective homodyne optical phase locking to a phase shift keying (PSK) signal with a residual carrier. We exploit 8b10b coding of the signal in order to reduce its low frequency spectral content, suppressing the data-to-phase crosstalk effect. In a transmission experiment on a 10 Gb/s binary PSK signal (8 Gb/s before coding), we achieved transmission over 215 km of dispersion-compensated, installed single-mode fibre, with no penalty compared to back-to-back at a bit error ratio of 10−3. The proposed solution is applicable to other modulation formats, including multi-level amplitude and/or phase modulation formats.

23 citations


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