Search query: Injection locking properties of a semiconductor laser

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abstract: Injection locking properties of a semiconductor laser have been analyzed, taking into account the injected carrier density dependent refractive index in the active region. It has been found that this dependence significantly affects the injection locking properties, giving rise to a peculiar asymmetric tuning curve and dynamic instability. The instability originates from the intermode interaction via the modulation in the injected carrier density caused by intensity beat. The detuning dependence of the direct modulation response characteristics inside and outside of the locking range have also been examined.
author_names: R S Lang
title: Injection locking properties of a semiconductor laser
year: 1982

abstract: In this paper the injection locking properties of two laterally coupled semiconductor lasers (LCSLs) are studied numerically. We consider external injection into either one (single external injection scheme) or both (simultaneous external injection scheme) of the LCSLs. We present stability maps for both schemes in the plane of the frequency detuning and the injection strength, where attention is centered on the influence of the waveguiding structures, the laser separation, the pump rate, and the frequency offset between the two coupled lasers. Our results contribute to a better understanding of LCSLs under external injection.
author_names: Nianqiang Li

Hadi Susanto

Benjamin R Cemlyn

Ian D Henning

Michael J Adams
title: Injection locking of two laterally coupled semiconductor laser arrays
venue: Photonics Europe
year: 2018

abstract: We present a theoretical and experimental investigation of injection locking of semiconductor lasers. The theoretical analysis takes into account the dependence of refractive index on the carrier density expressed by the linewidth enhancement factor a. Locking conditions and dynamic stability are analyzed. The nonzero value of a results in an increased locking bandwidth, where only part of the range corresponds to a dynamically stable state. Asymmetric characteristics are obtained for the locked power and phase as a function of frequency detuning between the master and slave laser. Outside the stable range, light injection gives rise to beat phenomena and intensity pulsations. The theoretical results were confirmed by experiments on 830 nm CSP lasers and 1.3 mm BH lasers. The experiments include the first measurements of locking bandwidth characteristics reported for 1.3 mm lasers. Power spectra are recorded under locked and near locked conditions and compared with theory. The 1.3 mm lasers are found to have a better dynamic stability than 830 nm lasers. Even so, the stability problems may exclude the particular application of injection locking where phase modulation is generated for coherent transmission.
author_names: Finn Mayer Mogensen

Henning Lind Olesen

Gunnar Jacobsen
title: Locking conditions and stability properties for a semiconductor laser with external light injection
year: 1985

abstract: The injection locking properties of a newly developed waveguide based external cavity semiconductor laser have been investigated. Using the injection locking properties to measure the Q factor of complex optical cavities with unknown internal losses, has been demonstrated for the first time.
author_names: Y Fan

Ruud M Oldenbeuving

M R H Khan

Chris G H Roeloffzen

Edwin Jan Klein

Chris J Lee

Herman Leonard Offerhaus

Klaus J Boller
title: Q factor measurements through injection locking of a semiconductor glass hybrid laser with unknown intracavity losses.
venue: Optics letters
year: 2014

abstract: Quantum Cascade lasers (QCLs) relying on intersubband transitions in semiconductor quantum well structures, show very short carrier lifetimes of the order of picoseconds [1] As a consequence, relaxation oscillations remain over damped up to modulation frequencies of several tens of GHz [2] enabling efficient amplitude modulation of the gain medium in this frequency range. These properties make QCLs ideally suited for RF injection locking. We demonstrate that the round trip frequency of THz QCLs, as observed from the beatnote, can be injection locked by RF modulating the bias current. Within a certain locking range we observe mutual phase locking of approximately 20 longitudinal modes for significantly lower RF powers than in previous studies [3] Apart from injection locking, we demonstrate beatnote control by means of an external cavity.
author_names: P Taeschler

Andres Forrer

David Stark

T Olariu

Mattias Beck

Jerome Faist

Giacomo Scalari
title: Low RF Power Injection Locking and Beatnote Control of Terahertz Quantum Cascade Laser Frequency Combs
venue: 2019 Conference on Lasers and Electro Optics Europe European Quantum Electronics Conference (CLEO/Europe EQEC)
year: 2019

abstract: The injection locking properties of self pulsation in semiconductor lasers are studied, using a phenomenological approach, based on an analogy with laser models. It has been found that the locking range is directly proportional to the input power, rather than to the square root of the input power as in injection locked microwaves or laser oscillators; the locking range is symmetric with respect to the self pulsation frequency in the free running case; in the locking state, the spectral linewidth of the self pulsation peak is equal to that of the incoming signal. These theoretical results agree very well with experimental ones, obtained on a distributed feedback three section laser.
author_names: Guang-Hua Duan

Guillaume Pham
title: Injection locking properties of self pulsation in semiconductor lasers
year: 1997

abstract: We experimentally and theoretically demonstrate the variety of the nonlinear dynamics exhibited by a single frequency semiconductor laser subjected to optical injection from a frequency comb. The injection parameters (the detuning and the injection strength) and the comb properties (comb spacing and the amplitude of the injected comb lines) are varied to unveil several dynamics such as injection locking, wave mixing, chaotic dynamics, and unlocked time periodic dynamics corresponding to new comb solutions. The asymmetry of the injected comb is shown to modify the size of the injection locking region in the parameter space, as well as the common properties between the new comb solutions observed and the injected comb.
author_names: Yaya Doumbia

Tushar Malica

Delphine Wolfersberger

Krassimir Panajotov

Marc Sciamanna
title: Nonlinear dynamics of a laser diode with an injection of an optical frequency comb.
venue: Optics express
year: 2020

author_names: Rongqing Hui

Antonio Mecozzi

Alessandro D'Ottavi

Paolo Spano
title: Injection locking properties of DFB semiconductor lasers
venue: 12th IEEE International Conference on Semiconductor Laser
year: 1990

abstract: Abstract Properties of attractors and basins of the locking unlocking bistability in an optically injected semiconductor laser are investigated to study the bistable operating conditions. The attractors of the injection locked and unlocked states are a fixed point and a period one limit cycle, respectively. The presence of the intrinsic noise makes the system operated at operating conditions close to the bistability boundaries unconditionally injection locked or unlocked, resulting in the disappearance of attractors. The basins and basin boundary exhibit fractal like structure which causes difficulty in controlling the bistable operation near the basin boundary. The presence of the intrinsic noise induces a jump of the orbit of an initial condition close to the basin boundary from the basin of one attractor to that of the other, resulting in the increased degree of the difficulty. The possibility of such a jump is higher for an operating condition showing a more complex basin boundary. Hence, how noise of a given strength affects the operation of a system under different operating conditions is related to the dimension of the basin boundary of the system. The dimension of the basin boundary as a function of the operating condition is thus computed to quantitatively characterize the fractal structure. Both fractal fractal and fractal smooth metamorphoses are found to happen in the system.
author_names: Sheng-Kwang Hwang

Jian Liu
title: Attractors and basins of the locking unlocking bistability in a semiconductor laser subject to strong optical injection
year: 1999

abstract: Abstract The injection locking characteristics of a multi mode semiconductor laser are considered. A formalism is developed to investigate the stability properties of an arbitrary laser mode subject to optical injection. The formalism is used to show that the relaxation oscillation frequency (ROF) in a semiconductor laser subject to optical injection is increased relative to that of the free running laser diode. Methods of utilizing positive detuning to determine the best approach of increasing the ROF of a semiconductor laser via injection locking are considered.
author_names: R J Jones

Paul S Spencer

K Alan Shore
title: Influence of detuned injection locking on the relaxation oscillation frequency of a multimode semiconductor laser
year: 2000