Narrow linewidth two-electrode 1560 nm laterally coupled distributed feedback lasers with third-order surface etched gratings

Dridi, Kais; Benhsaien, Abdessamad; Zhang, Jessica; Hinzer, Karin; Hall, Trevor J.

doi:10.1364/oe.22.019087

Cited by 16 publications

(8 citation statements)

References 29 publications

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“…For example, in the 180 nm technology used, with a capacitor of 1 pF, we could obtain time constants of the order of tens of milliseconds without resorting to any advanced design techniques. However, to realize even longer time constants (e.g., of the order of hundreds of milliseconds), we used a shifted-source biasing technique, as described in Linares-Barranco and Serrano-Gotarredona ( 2003 ).…”

Section: Methodsmentioning

confidence: 99%

A reconfigurable on-line learning spiking neuromorphic processor comprising 256 neurons and 128K synapses

et al. 2015

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Implementing compact, low-power artificial neural processing systems with real-time on-line learning abilities is still an open challenge. In this paper we present a full-custom mixed-signal VLSI device with neuromorphic learning circuits that emulate the biophysics of real spiking neurons and dynamic synapses for exploring the properties of computational neuroscience models and for building brain-inspired computing systems. The proposed architecture allows the on-chip configuration of a wide range of network connectivities, including recurrent and deep networks, with short-term and long-term plasticity. The device comprises 128 K analog synapse and 256 neuron circuits with biologically plausible dynamics and bi-stable spike-based plasticity mechanisms that endow it with on-line learning abilities. In addition to the analog circuits, the device comprises also asynchronous digital logic circuits for setting different synapse and neuron properties as well as different network configurations. This prototype device, fabricated using a 180 nm 1P6M CMOS process, occupies an area of 51.4 mm2, and consumes approximately 4 mW for typical experiments, for example involving attractor networks. Here we describe the details of the overall architecture and of the individual circuits and present experimental results that showcase its potential. By supporting a wide range of cortical-like computational modules comprising plasticity mechanisms, this device will enable the realization of intelligent autonomous systems with on-line learning capabilities.

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Section: Methodsmentioning

confidence: 99%

A reconfigurable on-line learning spiking neuromorphic processor comprising 256 neurons and 128K synapses

et al. 2015

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“…The electron density in the i th trap can exhibit a Gaussian distribution , where N is the electron density of a homogeneous QW sample, x i is the i th trap center, and σ x is the half width. The modulation of electron density of QWs can be achieved by using high order surface grating 50,51 . We further consider a pump laser field with periodically modulated intensity , which can be easily achieved in experiment by using an imperfect standing-wave (SW) field with unequal forward and backward components.…”

Section: Resultsmentioning

confidence: 99%

Parity-time symmetry in coherent asymmetric double quantum wells

Tian

Wan

Wang

et al. 2019

Sci Rep

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A coherently prepared asymmetric double semiconductor quantum well (QW) is proposed to realize parity-time ( PT ) symmetry. By appropriately tuning the laser fields and the pertinent QW parameters, PT -symmetric optical potentials are obtained by three different methods. Such a coherent QW system is reconfigurable and controllable, and it can generate new approaches of theoretically and experimentally studying PT -symmetric phenomena.

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“…The linewidth two-order-enhancement (18) is a gauge of further spectral purity of which, the potential can be reaped by tailoring the exciton within an advanced cavity such as lateralcoupling distributed feedback (LC-DFB) lasers [13,14,15].…”

Section: Resultsmentioning

confidence: 99%

The Linewidth Broadening Factor: A Length-Scale-Dependent Analytical Approach

Benhsaien¹

2017

NANO

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Abstract:A first-order frequency-dependent formula of the linewidth broadening factor (α-factor) is derived in terms of scattering rates whilst, a mesoscopic disk approach is used in order to accompany the dimension effect to the spontaneous emission lifetime (inverse of scattering rate). An excitonic correction to the relaxation properties is shown to occur provided the binding energy of the electron and hole is comparable to their eigenenergy-separation. The ensuing analysis is independent of the selected III-V material system and resides upon three simplifying assumptions which allow for analytical formulae to be derived.

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Narrow linewidth two-electrode 1560 nm laterally coupled distributed feedback lasers with third-order surface etched gratings

Cited by 16 publications

References 29 publications

A reconfigurable on-line learning spiking neuromorphic processor comprising 256 neurons and 128K synapses

A reconfigurable on-line learning spiking neuromorphic processor comprising 256 neurons and 128K synapses

Parity-time symmetry in coherent asymmetric double quantum wells

The Linewidth Broadening Factor: A Length-Scale-Dependent Analytical Approach

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