Topic
Equilibrium mode distribution
About: Equilibrium mode distribution is a research topic. Over the lifetime, 928 publications have been published within this topic receiving 14939 citations.
Papers published on a yearly basis
Papers
More filters
01 Jan 2008
TL;DR: In this paper, the coupling length for achieving the equilibrium mode distribution is determined by a simple algebraic equation and graph, separately for light-emitting diode LED and laser launchbeam distributions.
Abstract: lexandar Djordjevich vetislav Savovic* ity University of Hong Kong 3 Tat Chee Avenue owloon, Hong Kong hina Abstract. As a function of the coupling coefficient in step-index SI plastic optical fibers POFs , the coupling length for achieving the equilibrium mode distribution is determined by a simple algebraic equation and graph, separately for light-emitting diode LED and laser launchbeam distributions. One benefit of the proposed function is that it simplifies the determination of the coupling length by eliminating the need to numerically solve the power flow equation or equivalent repeatedly for all new values of the coupling coefficient. © 2008 Society of Photo-Optical Instrumentation Engineers. DOI: 10.1117/1.3049858
TL;DR: Plastic optical fiber amplifiers, doped with Er(C8H11F8O2)3, having an energy system showing 3-level features have been investigated theoretically focusing on the condition for amplifying mainly the lowest signal mode (LP01 mode), and it is shown that the gain is a strong function of the outer radius of the doping area.
Abstract: Plastic optical fiber amplifiers (POFAs), doped with Er(C8H11F8O2)3, having an energy system showing 3-level features have been investigated theoretically focusing on the condition for amplifying mainly the lowest signal mode (LP01 mode). We have studied the dependence of signal gain on fiber structure design for circular and ring doping conditions and have shown that the gain for the fundamental mode (LP01) and the second order mode (LP11 mode) is a strong function of the outer radius (ro) of the doping area. The gain for the LP01 mode becomes larger than that of LP11 mode when ro is less than 110 μm with doping concentration (N0) of 3 × 1020cm-3. A signal gain of 18.2 dB is predicted for LP01 mode for 9 cm long POFA with circular doping and ro of 80 μm when N0, the pump power and the core radius are 2.66 × 1020cm-3, 30 W and 250 μm, respectively. The gain is 12 dB larger than that for LP11 mode under the same condition.
TL;DR: In this article, the authors describe a compound ridge waveguide in which the highest order propagating mode is guided in the low index region of the structure and exhibits a narrow single lobe.
Abstract: We describe a novel compound ridge waveguide in which the highest order propagating mode is guided in the low index region of the structure and exhibits a narrow single lobe. For a prototype AlGaAs/GaAs was waveguide designed for operation at λ = 980 nm we show that due to the narrow lobed emission this mode produces significant improvements in source brightness and hence fibre coupling efficiency. In the case of a 61 μm aperture laser diode operating in this mode 20% coupling efficiency is predicted between a structure and standard single mode fibre designed for λ = 980 nm operation.
TL;DR: In this article, the authors describe the elimination of undesired mode suppression in a multiple-device cylindrical cavity combiner caused by the effect of excitation of the desired power-combining mode due to external signal injection.
Abstract: This paper describes the elimination of undesired mode suppression in a multiple-device cylindrical cavity combiner caused by the effect of excitation of the desired power-combining mode due to external signal injection. Mode analysis is carried out to derive the condition of undesired mode suppression and of sustaining the desired mode oscillation and to prove the capability of perfect combining of the output powers of the multiple-device structure and the power of injected signal. Experiments with TM020-mode cavity confirmed the theory.
12 Sep 2000
TL;DR: In this paper, the spatial transient regime of a fiber mode transformation near the cutoff frequency is analyzed both theoretically and numerically depending on material losses and radial distribution of the refractive coefficient of a guiding structure.
Abstract: The spatial transient regime of a fiber mode transformation near the cutoff frequency is analyzed both theoretically and numerically depending on material losses and radial distribution of the refractive coefficient of a guiding structure. Kerr-like nonlinearity of a fiber material is shown to be efficiently used to manage the transmittance of the structures near the cutoff frequency of a fiber mode.