Bandwidth enhancement of Fabry-Perot quantum-well lasers by injection-locking

Jin, Xiaomin; Chuang, Shun‐Lien

doi:10.1016/j.sse.2006.04.009

Cited by 37 publications

(15 citation statements)

References 27 publications

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“…For this application, the power of the master laser can be much lower than that of the slave laser, allowing for the realization of high-power laser devices with extremely low linewidth [LIU02a]. Furthermore, the modulation bandwidth of laser devices was shown to be greatly increased by an appropriate injection setup [JIN06,TER08a,LAU09a], with bandwidths exceeding 100 GHz [LAU08a].…”

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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“…Fabry-Perot semiconductor lasers are well known but still it is needed some discussion on the different models to evaluate some principal parameters behavior as the linewidth enhancement factor (6). In an internal report we have compared the results obtained with several model (7)- (8)- (9) and results from the commercial software of VPI: we found no different between both of them.…”

Section: Bistabilitymentioning

confidence: 95%

Linewidth influence in photonics logic device

2007

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Photonics logic devices are currently finding applications in most of the fields where optical signals are employed. These areas range from optical communications to optical computing, covering as well as other applications in photonics sensing and metrology. Most of the proposed configurations with photonics logic devices are based on semiconductor laser structures with "on/off" behaviors, operating in an optical amplifier configuration. They are able to offer non-linear gain or bistable operation, being these properties the basis for their applications in these fields. Moreover, their large number of potential affecting parameters onto their behavior offers the possibility to choose the best solution for each case.

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“…While 50 GHz spacing can be readily achieved in the transmitter, there are several challenges in terms of the receiver, the most critical of which are available filtering techniques to accurately analyze the performance of the channel under test. At 1550 nm, injection locking was shown to improve filtering [25] for data recovery [26] and to increase BW [27]. At 2000 nm, injection locking was shown to narrow the linewidth of lasers to permit higher-order modulation formats [17].…”

Section: B Injection Locking At 2000 Nm-a Path To Filteringmentioning

confidence: 99%