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.
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01 Dec 2008
TL;DR: In this article, the authors report a theoretical characterization of a commercial large mode area with a single mode photonic crystal fiber, i.e., the LMA-15 fiber produced by Crystal Fibre A/S.
Abstract: We report a theoretical characterization of a commercial large mode area endlessly single mode photonic crystal fiber, ie the LMA-15 fiber produced by Crystal Fibre A/S For the study, we employed a finite element leaky mode solver developed in earlier work Based on the computed confinement loss of the modes, we found that as opposed to the claim of the factory, the fiber is obviously multi-moded in the visible light regime, even for a rather long fiber length Additionally, we also computed the dispersion of the fundamental mode which agrees nicely to the measured results given by the factory's datasheet
Patent•
14 Apr 2004TL;DR: In this paper, the authors proposed a mode transformation process for the transformation of a propagation mode of optical signals in a group having interlacing or multiplexing of modes, modes filleting, and mode changing.
Abstract: The device (D) has two mode converters (3,5) coupled to each other by a portion of a multimode fiber (4). The converter (3) receives signals propagating in a fundamental mode, and delivers two signals according to the fundamental mode and a higher order mode respectively, to the fiber (4). The converter (5) is arranged to interfere the signals according to the two modes to provide a chosen spectral spacing at output. A mode transformation means (3-5) transforms modes associated to a multimode fiber (2). Independent claims are also included for the following: (a) a process for transformation of a propagation mode of optical signals (b) a use of an optical device and a propagation mode transformation process in a group having interlacing or multiplexing of modes, modes filleting, and mode changing.
TL;DR: In this paper, the state of mode coupling in GeO 2 doped core-silica clad optical fibers was investigated using the power flow equation and the coupling coefficient in this equation was first tuned such that the equation could correctly reconstruct previously reported measured output power distributions.
Abstract: The state of mode coupling in 340 µm GeO 2 doped core-silica clad optical fibers is investigated in this article using the power flow equation. The coupling coefficient in this equation was first tuned such that the equation could correctly reconstruct previously reported measured output power distributions. It was found that the GeO 2 doped core-silica clad optical fiber showed stronger mode coupling than both, glass and popular plastic optical fibers. Consequently, the equilibrium as well as steady state mode distributions were achieved at shorter fiber lengths in GeO 2 doped core-silica clad optical fibers.
TL;DR: In this article, a fiber-optic line consisting of a high-coherence source emitting a linearly polarized spherical wave, a fiber waveguide, and a threshold photodetector is modulated by a simple binary code, and the optimization criteria are the requirement of minimum distortion of the signal waveform at the exit from the fiber and the maximum stability of the communication process.
Abstract: The wave approach is used to solve the problem of design of a fiber-optic line consisting of a high-coherence source emitting a linearly polarized spherical wave, a fiber waveguide, and a threshold photodetector. The intensity of the radiation emitted by the source is modulated by a simple binary code. The optimization criteria are the requirement of minimum distortion of the signal waveform at the exit from the fiber and the maximum stability of the communication process. Allowance is made for all types of dispersion (material, waveguide, and mode), and also for the coupling between the modes because of slight irregularities of the fiber resulting in distortion of the pulse shape. The dependences of the duration of the input pulses and of the photodetector threshold on the wavelength of the radiation emitted by the source are given and analyzed, together with the dependence of the reliability of reception of the transmitted signal on the fiber waveguide length.
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01 Jan 1995
TL;DR: In this paper, a single mode fiber is used as a point-like input beam source for a multi-mode fiber, and the amplitude of the output beam is expressed by the complex amplitude of input beam.
Abstract: There have been many displacement sensing methods based on optical fibers such as using mode scrambling of multi-mode fibers or intensity change of single mode fibers due to coupling mismatch[l2]. In this work, we used as displacement sensing the mode excitation change caused by spatial variation of input beam. A single mode fiber is used as a point-like input beam source for a multi-mode fiber. Since the core size of the multi-mode fiber is about 10 times larger than that of the single mode fiber, if two fibers are closely located and the multi-mode fiber is sufficiently long, the input beam from the single mode fiber excites many modes of the multi-mode fiber without power loss. In that case, the complex amplitude of output beam is expressed ad31