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We present switching experiments performed on pillar microcavities containing a collection of quantum dots (QDs). Switching events are probed using QD luminescence, after ultrafast optical injection of free carriers. We observe large switching amplitudes (by as much as 20 linewidths), as well as differential switching of the pillar modes under inhomogeneous pumping. Through transient coupling of QDs...
Realizing CMOS-compatible integrated lasers on silicon is a crucial step towards cost-efficient, high-functional optoelectronic integrated circuits (OEICs). Here, we report on a concept to embed active optical devices based on a bonded III–V epitaxial layer stack between the FEOL and BEOL of a CMOS silicon photonics chip. Ultra-shallow laser devices are realized with this concept and optically-pumped...
We demonstrate an active random fiber laser by directly pumping a 100 m erbium-doped fiber at 980 nm wavelength, with a fiber loop mirror forming a half-open cavity. Random lasing with competing spectral modes in the range from 1535 nm to 1560 nm is achieved, with the maximum lasing slope efficiency around 10%. We also study the effect of combining a dispersion compensated fiber with the erbium-doped...
A novel design of a broadband discrete Raman/EDFA hybrid amplifier is proposed. A broadband signal of 84 channels across 75 nm is experimentally amplified and the gain contribution of each amplifier stage is shown. The amplifier consists of a discrete Raman amplifier using a DCF fibre pumped at three 14×× nm wavelengths, which is followed by a 1480 nm pumped erbium doped fibre. An average gain of...
Chalcogenide glass fibres have been demonstrated as a suitable medium for the realisation of spontaneous emission sources for mid-infrared photonics applications with a particular emphasis on sensor technology. Such sources give a viable alternative to other solutions due to their potentially low cost, high reliability and robustness when pumped using commercially available semiconductor lasers. We...
In this paper, we present electrically pumped GaAsBi quantum well (QW) laser diodes (LDs) grown by molecular beam epitaxy. The LDs reveal a record long lasing wavelength of 1.14 µm at 300 K and can be operated under CW excitation up to 273 K. They also show high performance with an internal quantum efficiency of 86% and an internal optical loss of 10 cm−1. The characteristic temperature is 79 K in...
We report on a theoretical and experimental study performed on AlAs/GaAs micropillar cavities containing InGaAs quantum dots as active medium. The devices have the interesting property of having almost all emission (spontaneous and stimulated) channelled into one cavity mode. They are excellent experimental platforms for studying laser physics because their emission behaviours question our understanding...
FYLA manufactures ns, ps and fs proprietary fiber lasers in the range of 1, 1.5, 2.0 µm wavelengths and supercontinuum VIS to NIR bands. The go-to-market approach of FYLA is based on an R+D strategy deeply focused on our (current and future) customer needs. This paper presents a selection of advanced solutions based in supercontinuum illumination that have been developed to satisfy such needs and...
This paper updates the study of anti-resonant hollow-core fibers (AR-HCFs) and their applications. Such fibers have been shown to offer low-loss transmission windows which greatly extend the traditional spectral regions of hollow-core fibers into visible and mid-IR. The single-mode performance, large mode area, low dispersion and low nonlinearity make AR-HCF the most promising medium for high-power...
We overview recent advances in the spatio-temporal nonlinear dynamics of optical pulses propagating in multimode optical fibers. The Kerr effect leads to spatial beam self-cleaning in a graded-index multimode optical fiber, followed by sideband series generation spanning multiple octaves. Effectively single mode supercontinuum spanning from the visible to the mid-infrared was also demonstrated. Enhancement...
An oriented-dependence-microlens (ODM) fabricated by automatic grinding and fusion techniques is proposed. The ODM can be visually surface-feature aligned for high tolerance coupling lasers to polarization-maintaining-fibers (PMFs). The 3-dB coupling efficiency and polarized-extinction-ratio (PER) angular tolerances of the ODM were obtained as high as ± 16°. Furthermore, the 1-dB coupling and PER...
We study experimentally a semiconductor laser operating in a feedback-induced regime known as low frequency fluctuations (LFFs), in which the laser emits a spiking output that resembles the spikes of biological neurons. We analyze the response to a weak periodic signal that is directly applied to the laser pump current, as a function of the frequency of the signal, and discuss the observations in...
The paper reviews the basic principles and recent advances of Raman fibre laser (RFL) based amplification techniques in long-haul/unrepeatered coherent transmission systems. Different aspects of RFL based amplification have been characterised, including signal power distributions and relative intensity noise (RIN). Various RFL based amplifier designs have been evaluated in long-haul coherent transmission...
We report an all-optical realisation of a quantum relay experiment at a telecom wavelength. The main idea relies on utilizing a picosecond 2.5 GHz repetition rate telecom laser as a master clock to allow, thanks to dedicated distribution channels, the generation of synchronized entangled pairs of photons at remote locations. This is a necessary condition for achieving a reliable quantum relay function...
The microchip lasers, being sources of coherent light, suffer from one serious drawback: low spatial quality of the beam, strongly reducing the brightness of emitted radiation. Attempts to improve the beam quality, such as pump-beam guiding, external feedback, either strongly reduce the emission power, or drastically increase the size and complexity of the lasers. Here we propose that specially designed...
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