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This paper presents a comprehensive numerical study on the surface relief technique implemented in nitride Vertical-Cavity Surface-Emitting Laser (VCSEL) emitting in the 414-nm range. We calculated the threshold currents and optical modes in VCSEL structures with and without a surface relief. A standard structure was based on the first continuous-wave nitride VCSEL reported to operate at room temperature...
The impact of large phase noise, typical of cost-effective energy-efficient sources such as VCSELs, on the transmission of a single side-band optical OFDM signal in case of direct detection over uncompensated fiber tracks is investigated thanks to Monte Carlo simulations. Comparison with the results achieved by a semi-analytical approach is reported, in particular when the laser linewidth is comparable...
We report on the design, fabrication and characterization of all-photonic-crystal, electrically-pumped, second-order DFB lasers arrays emitting around 2.4 µm. Lasers were fabricated using GaSb-based materials and optimized 2D photonic crystal waveguides geometry. Threshold in the range of 100–150 mA depending on the PhC period are measured. CW emission with high SMSRs of 35 dB are achieved. Such laser...
In this paper, we present main results of electrical modelling of various semiconductor lasers specifying their advantages and drawbacks in terms of gain, noise, and non-linearity. As these components are considered as an electro-optical transducer in photonic-microwave links, their required characteristics and performances that cannot be unique and are strongly dependent on dedicated applications...
Single-frequency fiber lasers are specific devices suitable for optical communication, interferometric sensing, coherent light detection and ranging, laser spectroscopy, etc. Typical DBR fiber laser consists of active fiber region with two fiber Bragg gratings (FBGs) at the ends serving as resonant mirrors. For single-frequency lasing the length of an amplifying fiber can be determined correctly via...
This paper presents the experimental results of ultra-high power narrow band tuning Distributed Bragg Reflector (DBR) lasers for telecom applications. Tuning range is about 8 – 10 nm, maximum output power is above 100 mW, Side Mode Suppression Ratio (SMSR) is around 55 – 60 dB, Relative Intensity Noise (RIN) is < −135 dB/Hz, and linewidth is between 2.5 MHz and 5 MHz.
We discuss the numerical modelling of lanthanide-ion doped chalcogenide glass fibre lasers for operation in the mid-infrared wavelength region. We extract the modelling parameters from emission and absorption measurements using Judd-Ofelt and McCumber theory. Numerical algorithms are developed based on the experimentally extracted fibre parameters. The simulation results predict lasing with slope...
We present an analysis of dilute bismide quantum well (QW) lasers grown on GaAs and InP substrates. Our theoretical analysis is based upon a 12-band k·p Hamiltonian which directly incorporates the strong impact of Bi incorporation on the band structure using a band-anticrossing approach. For GaBiAs QWs grown on GaAs we analyse the device performance as a function of Bi composition, and quantify the...
In this paper we present the results of the computer simulation of the GaSb-based multi-quantum-well GaInAsSb/GaSb vertical-cavity surface-emitting lasers (VCSELs) with the emission wavelength above 2.6 µm. Calculations have been performed with the aid of the comprehensive fully self-consistent numerical model developed by our group. The model combines electrical, thermal, gain, and optical effects,...
We investigated the lasing spectra, threshold gain values, and modal fields of two-dimensional elliptical microcavity lasers with centrally located circular active regions. Our numerical experiments were based on the Muller boundary equations solved by the Nystrom method. They showed that the whispering gallery modes (WGM) and the bow-tie modes (BTM) exist in such resonators. We studied the field...
We study the modes of two-dimensional (2-D) microdisk and microring lasers using the electromagnetic theory, namely considering them as dielectric resonators with ring-like active regions having radially non-uniform gain profile. On the approximation of the gain profile with a stepped function, we reduce the considered eigenvalue problems to transcendental equations and solve them numerically. Finally...
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