Refractive index dynamics of quantum dot based waveguide electroabsorbers

Piwoński, Tomasz; Pulka, Jaroslaw; Viktorov, Evgeny A.; Huyet, Guillaume; Houlihan, John

doi:10.1063/1.3476347

Cited by 12 publications

(7 citation statements)

References 12 publications

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“…We use a system of delay differential equations (DDE) to simulate dynamics in our system. Similar approach has been proved as a reliable approach to model modelocking in semicondictor lasers [17].The magnitude of the phase-amplitude coupling in semiconductor devices can be conveniently estimated by using α-factors [18]. In QD absorbers, α-factor depends on the relationship between the lasing wavelength and spectral position of peak absorption [16], what allows additional control of phase-amplitude coupling.…”

Section: Resultsmentioning

confidence: 99%

Soliton bound states in semiconductor disk laser

et al. 2014

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We report what we believe is the first demonstration of a temporal soliton bound state in semiconductor disk laser. The laser was passively mode-locked using a quantum dot based semiconductor saturable absorber mirror (QD-SESAM). Two mode-locking regimes were observed where the laser would emit single or closely spaced double pulses (soliton bound state regime) per cavity round-trip. The pulses in soliton bound state regime were spaced by discrete, fixed time duration. We use a system of delay differential equations to model the dynamics of our device.

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Section: Resultsmentioning

confidence: 99%

Soliton bound states in semiconductor disk laser

et al. 2014

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“…3(b) changed from 100 mA to 200 mA, the repetition frequency changed by 40 MHz, which is too large to be caused only by the temperature effect. Here, we propose that the decrease of the repetition frequency could be due to a positive differential refractive index which has been observed at the excited-state of QD amplifiers [11,12] and waveguide electro-absorbers [34].…”

Section: Evolution Of Electrical Spectramentioning

confidence: 89%

Investigation of quantum dot passively mode-locked lasers with excited-state transition

Cheng

Lee

2013

Opt. Express

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Monolithic passively mode-locked quantum dot lasers with excited-state transition were investigated in a broad operating range without ground-state lasing. Optical and electrical characteristics of these mode locked lasers were studied in detail at different levels of injection current and absorber bias. Very different behaviors in the evolution of the hysteresis, the optical spectra and the evolution of repetition frequency were observed between our lasers and conventional quantum dot lasers with ground-state transition. Possible mechanisms behind these observed phenomena were proposed and discussed. A minimum pulse width of 3.3 ps and an externally compressed pulse width of 0.78 ps were obtained.

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“…Another active medium that can be considered for modulo 2π beam steering is quantum dots. 24,25 Quantum dots have the advantage that both polarizations can be changed based on applying voltage rather than just one polarization, and they can react fast, similar to EO materials, and much faster than LCs. To date, not much has, however, been published using quantum dots for index change, but recently Portland, Oregon based Inv3ctus, Inc. has been granted a patent on a nonmechanical beam scanning technology employing a quantum dot phased array (QDPA).…”

Section: Quantum Dot Modulo 2π Opasmentioning

confidence: 99%

Progress and opportunities in the development of nonmechanical beam steering for electro-optical systems

McManamon¹,

Ataei²

2019

Opt. Eng.

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We discuss over three decades of progress in nonmechanical beam steering, provide a comparison of approaches being developed, and comment on promising approaches not yet fully developed. Most of the work in nonmechanical beam steering has been for narrowband optical systems, but a brief discussion is provided of broadband. The majority of the nonmechanical approaches to beam steering create a tilted optical path delay (OPD) to change the wavefront, but some directly create a phase delay. OPD-based approaches may be true time delay, with no resets or modulo 2πn optical phased arrays that have resets. Most of the nonmechanical optical beam steering approaches tilt an existing wavefront and are called space fed approaches, because the beam is already formed when the wavefront is tilted. For the majority of radar nonmechanical beam steering, the tilted wavefront is formed by individual transmit/receive modules. Periodic structures (gratings) spread different wavelengths of light in angle, thus steering light, and are also used for nonmechanical steering. Our paper is derived from a conference paper presented at Photonics West in February 2019.

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Refractive index dynamics of quantum dot based waveguide electroabsorbers

Cited by 12 publications

References 12 publications

Soliton bound states in semiconductor disk laser

Soliton bound states in semiconductor disk laser

Investigation of quantum dot passively mode-locked lasers with excited-state transition

Progress and opportunities in the development of nonmechanical beam steering for electro-optical systems

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