Gain coupled grating
WebJul 1, 1991 · A complex-coupled DFB THz QCL has a DFB grating etched into the top surface of the active region across the upper cladding layer; therefore, these devices have mixed index and gain coupling,... WebJun 1, 1993 · @article{osti_5708446, title = {On the distinctive features of gain coupled DFB lasers and DFB laser with second-order grating}, author = {Baets, R G and David, K and Morthier, G}, abstractNote = {First, the two types of DFB lasers with gain coupling, true gain coupled lasers (with either a gain or loss grating) and second-order index …
Gain coupled grating
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Webvalidate the novel laterally coupled dielectric grating as a technologically superior and potentially cost-effective approach for fabricating DFB and DBR lasers free of their ... various compound semiconductor gain materials, distributed feedback (DFB) and distributed Bragg reflector (DBR) lasers are finding a wide range of ... WebMar 21, 2024 · Gain-coupled DFB laser (Luo et al. 1990) is a good way for conventional semiconductor laser to work in stable single-mode operation, but it has problem when applied in QCL since the large loss as a result of the etched active region. Loss coupling is effective method in this case, which helps increase the loss difference between high …
WebMar 1, 2024 · Periodic surface metal p-contact with insulated grooves acting as 32rd order gain-coupled gratings fabricated merely by i-line lithography caused periodic injection … WebMar 31, 2024 · gain ground on: [idiom] to move faster or work harder in order to come closer to.
WebFeb 5, 2024 · The second type of grating can be fabricated with periodic gain or loss variations within the active region, which is named as gain-coupled DFB grating. Despite the different structure from the first one, the descriptions of Fig. 4.1 a remain valid for the second one except for the fact that the phases of the subsequent reflectivities along the ... WebIn this paper is presented an accurate model for gain coupled (GC) DFB laser with absorption grating (AG). Numerical results about the coupling coefficients dependence on AG thickness and on grating carrier density, are discussed in order to justify the new model, which solves selfconsistenly the rate equations for the carriers in active and AG layers …
WebWe have investigated gain coupled lasers based on metal gratings patterned laterally to the laser ridge. For sufficiently small ridges, the evanescent field of the laser mode couples strongly to the grating. Ridge waveguide lasers were processed from an InGaAs/AlGaAs GRINSCH structure. The cw threshold currents are around 12 mA for a cavity with 800 …
WebMay 13, 2024 · 1.3 µm gain coupled DFB laser introduced a well-known stopband into the ASE spectrum and enhanced the modes in its vicinity, favouring the possible single-mode operation. We estimated from the width of the ASE stopband (λ = 3nm), the L as ∼3, rendering the value of 100 cm−1 [12, 13]. The typical lasing wavelength of the gain … python variable auf datentyp prüfenWebDec 1, 2000 · Static and dynamic properties of in-phase gain-coupled multiple quantum well distributed feedback (DFB) lasers with second-order gratings have been measured at 1.55 /spl mu/m. Devices with both… Expand 1 High power narrow far-field broad-stripe semiconductor lasers with second-order metal grating feedback Yongyi Chen, L. Qin, +4 … python variable assignment with ifWebThe dependence of these two coupling coefficients on grating tooth shapes and depths and the dimensions of graded refractive index (GRIN) waveguides is numerically analysed. The results show that the gratings with linear GRIN waveguides have the largest κeff . The possibility of realizing a complex-coupled DFB laser, even a pure gain or loss ... python variable 0 ifWebNumerical results about the coupling coefficients dependence on AG thickness and on grating carrier density, are discussed in order to justify the new model, which solves … python variable add plus 1WebSince the coupling strength of a gain grating is gain-dependent, the study of the threshold condition of gain-coupled DFB lasers is much more complex than that of index-coupled DFB lasers. 1 ‘ 2 Such a study is also crucial for the determination of the conditions needed for increasing the single mode yield of gain-coupled DFB lasers. Keywords python variable assignmentWebJan 15, 2024 · The periodic surface metal p-contact with insulated grating grooves realizes a gain coupled mechanism. Our devices provided a single longitudinal mode with the … python variable definitionWebAbstract. Grating-coupled surface-emitting diodes are modeled and analyzed in terms of radiation power, threshold gain, and saturation effects. We find that the dominant (i.e., the lowest-loss) mode radiates poorly, while a weaker mode has a much higher radiation power and appears dominant if only the radiated power is measured. python variable declaration with data type