All fiber-optic neural network using coupled SOA based ring lasers

Hill, M.T.; Frietman, Edward E. E.; Waardt, H. de; Khoe, G.D.; Dorren, H.J.S.

doi:10.1109/tnn.2002.804222

Cited by 58 publications

(44 citation statements)

References 30 publications

(63 reference statements)

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“…Recently, this high dimensionality of lasers with delayed optical feedback has been exploited for the implementation of optical neural networks [HIL02] and reservoir computing [PAQ12,DUP12,NGU14]. Here, the increase of dimensionality by the feedback leads to the formation of many "virtual network nodes", while only one physical laser node has to be employed, leading to an increase in computational power.…”

Section: Quantum-dot Laser Dynamicsmentioning

confidence: 99%

Nonlinear and Nonequilibrium Dynamics of Quantum-Dot Optoelectronic Devices

Lingnau

2015

Springer Theses

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In this thesis the dynamics and performance of optoelectronic devices based on semiconductor quantum-dots are investigated.In the first part, the dynamics of quantum-dot lasers under external perturbations is discussed. Using a microscopically based balance equation model that incorporates detailed charge-carrier scattering dynamics and the possibility to describe nonequilibrium between intra-band electronic states, the relaxation oscillations of the quantum-dot laser are investigated. Three qualitatively different dynamic regimes are identified in dependence of the scattering rates -the "constantreservoir" regime for slow scattering, the "overdamped" regime, and the "synchronized" regime for high scattering -characterized by a varying degree of nonequilibrium between the quantum-dot and reservoir states.Important differences to conventional lasers are found in the modulation response and the dynamics in optical injection and feedback setups. Common theoretical models and approaches used to describe these applications are shown to yield inaccurate predictions, especially in the "constant-reservoir" and "overdamped" dynamic regimes. An important consequence is that the amplitude-phase coupling in quantum-dot lasers, commonly described by the α-factor, differs from conventional descriptions due to the desynchronization of gain and refractive index. While the α-factor describes bifurcations of fixed points accurately, it fails in describing dynamic solutions and overestimates the extent of complex dynamics. The observed low sensitivity to optical perturbations in quantum-dot lasers can therefore be attributed partly to the charge-carrier nonequilibrium. Three quantum-dot laser models on different levels of sophistication are presented that can accurately describe the quantum-dot nonequilibrium dynamics.In the second part of the thesis, the performance of quantum-dot semiconductor optical amplifiers is investigated, and two types of applications unique to quantum-dots as active medium are discussed. The ground and excited states of the quantum-dots allow an ultra-broad-band amplification of optical data streams. Amplified signals on the ground-state frequencies are shown to generally exhibit higher quality than on the excited state, due to a lower sensitivity of the groundstate to carrier-density variations. Nevertheless the quantum-dot amplifier is found to allow effective amplification on both frequency ranges. Furthermore, a parameter range is identified that allows for a simultaneous amplification of data signals on the ground and excited state in a counter-propagating setup.The long microscopically polarization dephasing times in quantum-dots are found to enable quantum-coherent interactions on a macroscopic scale at room-temperature. By comparison with experiments, the occurrence of Rabi-oscillations by amplification of ultra-short pulses is demonstrated. Quantum-dot based devices could therefore be used for future applications based on quantum-coherent effects.

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Section: Quantum-dot Laser Dynamicsmentioning

confidence: 99%

Nonlinear and Nonequilibrium Dynamics of Quantum-Dot Optoelectronic Devices

Lingnau

2015

Springer Theses

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“…It is however not necessary to know what the entire content of the buffer is thus decreasing the required optical signal processing for the buffer algorithm. In terms of the all-optical implementation, recirculating buffers provide a more feasible algorithm that can be implemented using, for example, a laser neural network [17], and the discrimination of packet delays in the FDLs could, for example, be done using wavelength conversion and demultiplexers as illustrated by the all-optical variable optical delay circuits described in Ref. [7,8].…”

Section: Recirculating Buffersmentioning

confidence: 99%

“…The all-optical solution provides a much higher processing speed, provides transparency, and mitigates the optoelectronic conversion bottleneck. All-optical functions that have been developed include switching [1][2][3] header processing [4,5], buffering methods [6][7][8][9], wavelength conversion [10][11][12] signal regeneration [13], and limited signal processing used for high-speed transmission such as multiplexing and demultiplexing [14][15][16], and for logic functions [17,18].…”

Section: Introductionmentioning

confidence: 99%

Architectures and Buffering for All-Optical Packet-Switched Cross-Connects

et al. 2006

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This paper considers the performance of an alloptical packet-switched cross-connect. All-optical header processing and all-optical routing are implemented in the cross-connect architectures. The main metric considered to measure the performance is the packet loss ratio for the buffering. This is influenced primarily by three factors. The first is the cross-connect architecture: feedback or feed-forward buffering, incorporating wavelength domain contention resolution. The second is the selection of the fibre delay line distribution: degenerate or non-degenerate distributions. And the third is the traffic load together with the traffic model used for the performance analysis: a Poisson distribution or a selfsimilar model. It is shown that the optimal implementation of a feedback buffer requires a technique such as overflow buffering as well as the superior performance of an all-optical switch in order to maintain signal quality through multiple recirculations.

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“…Optical isolators (ISOs) are used to allow the light to travel in only one direction, thus ensuring lasing in one direction. The operation principle of a single ring laser is described in [7]. If the gain of the SOA is higher than the threshold of the ring laser, lasing starts.…”

Section: System Conceptmentioning

confidence: 99%

Three-state all-optical memory based on coupled ring lasers

Liu

Hill

Calabretta

et al. 2003

IEEE Photon. Technol. Lett.

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Abstract-An all-optical memory with three states is presented. The memory is realized from three coupled ring lasers. The state of the optical memory is determined by the wavelength of the memory's output light. In each state, only one wavelength is dominant. The three-state all-optical memory can be utilized in all-optical packet switches. The concept of the memory is explained and experimental results are presented that demonstrate that a contrast ratio larger than 40 dB between output states of the memory can be obtained.Index Terms-All-optical memories, multiple state, packet switching, semiconductor optical amplifier.

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All fiber-optic neural network using coupled SOA based ring lasers

Cited by 58 publications

References 30 publications

Nonlinear and Nonequilibrium Dynamics of Quantum-Dot Optoelectronic Devices

Nonlinear and Nonequilibrium Dynamics of Quantum-Dot Optoelectronic Devices

Architectures and Buffering for All-Optical Packet-Switched Cross-Connects

Three-state all-optical memory based on coupled ring lasers

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