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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TL;DR: In this article, the dynamic optical spectrum and optical transmission characteristics of a 1.55 μm conventional distributed feedback (DFB) laser with a side mode were analyzed and it was shown that the mode switching affects considerably the bit error rate performance of 113 km single-mode fiber transmission at 140 Mbit/s.
Abstract: The dynamic optical spectrum and optical transmission characteristics of a 1.55 μm conventional distributed feedback (DFB) laser with a side mode were analysed. The laser used in the experiment came to operate in two modes although initially it had operated in single-mode. When this laser was directly modulated by setting the bias current around the threshold, the mode switching between a main mode and a side mode was observed to be similar to mode partitioning in Fabry-Perot (FP) lasers. The mode switching affects considerably the bit error rate performance of 113 km single-mode fibre transmission at 140 Mbit/s.
1 citations
TL;DR: In this article, the interference pattern arises from the superposition of two coherent free space tilted beams at the input facet of an optical waveguide to excite selectively a given optical mode.
Abstract: Here, we propose to use the interference pattern which arises from the superposition of two coherent free space tilted beams at the input facet of an optical waveguide to excite selectively a given optical mode. By tuning the period of the interference fringes, it is possible to select the excited mode in the waveguide by maximizing the overlap integral with the modal optical field. Our setup is based on a free space interferometer that is theoretically capable of selectively exciting higher order modes in a micron-sized waveguide with an average cross-talk of 37 dB and a mode selectivity higher than 90%. The system is easily reconfigurable and can be straightforwardly integrated on a chip to enhance miniaturization, compactness, and stability.
1 citations
12 May 2013
TL;DR: The onset of mode instabilities is an effect occurring in high-average-power fiber lasers and amplifiers when their output average power exceeds a certain threshold value as discussed by the authors, characterized by a sudden change of the output beam from an initially stable fundamental mode to a regime with more or less chaotic fluctuations between the fundamental mode and one or more higher-order modes.
Abstract: The onset of mode instabilities is an effect occurring in high-average-power fiber lasers and amplifiers when their output average power exceeds a certain threshold value [1]. This effect is characterized by a sudden change of the output beam from an initially stable fundamental mode to a regime with more or less chaotic fluctuations between the fundamental mode and one or more higher-order modes (shown in Fig. 1). Mode instabilities occur in different fiber architectures and they can additionally be observed both in continuous wave and in pulsed operation. Only a few years after the first mention of this effect in the literature, it has become one of the most severe limitations for the further average-power scaling of fiber lasers and amplifiers.
1 citations
TL;DR: In this article , the spatial and temporal characteristics of a degenerate four-wave converter in a multimode waveguide with resonant nonlinearity in a scheme with counter-pumping waves were analyzed using the time response function and the point spread function.
Abstract: Spatial and temporal characteristics of a degenerate four-wave converter in a multimode waveguide with resonant nonlinearity in a scheme with counter-pumping waves are analyzed using the time response function and the point spread function. For single-mode pump waves with equal mode numbers, the dependences of the time response width on the waveguide length, the intensity of the first pump waves, and the mode number in the mode expansion of the object wave amplitude are obtained for the four-wave converter. The greatest contribution to the object wave amplitude is shown to be from the waveguide mode whose number coincides with the mode number of single-mode pump waves. For the stationary model, taking into account the spatial structure of the Gaussian pump wave leads to a monotonous decrease with a decrease in the pump beam width, followed by a constant value of the PSF module width. With single-mode pump waves with equal mode numbers, An increase in the mode number of the pump waves leads to a redistribution of energy concentrated in the side maxima of the point signal image and improvement in the quality of the wavefront reversal for a model with single-mode pump waves with equal mode numbers.
1 citations
Journal Article•
TL;DR: In this paper, the spectrogram of loss and the graph of mode density of a single mode of birefringence optical fiber were obtained using the instrument for the transmission loss of single mode, and the experimental results showed that at the fixed incident angle the distribution of mode is independent for different curvature radius brings for the different loss.
Abstract: Using the instrument for the transmission loss of single mode of winding birefringence optical fiber, the spectrogram of loss and the graph of mode density are obtained. The experimental results show that at the fixed incident angle the distribution of mode is independent for different curvature radius brings for the different loss.
1 citations