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Mode scrambler

About: Mode scrambler is a research topic. Over the lifetime, 896 publications have been published within this topic receiving 13595 citations.


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Proceedings ArticleDOI
22 Feb 1998
TL;DR: In this article, a Fabry-Perot device where mode conversion (LP/sub 01/-LP/ sub 11/) is accompanied by mode reflection is presented. But the mode conversion is only reflected in the LP/sub 11/ mode and therefore not guided by the adjacent single-mode fiber.
Abstract: Summary form only given. Tilted Bragg gratings have been demonstrated to be efficient mode converters in two-mode fibers. A pair of tilted Bragg gratings in a two-mode section of a single-mode fiber can be written in a way to become a nonreflecting narrow-band transmission filter. The latter device behaves like an ordinary Fabry-Perot with one exception: light is only reflected in the LP/sub 11/ mode and therefore not guided by the adjacent single-mode fiber. In this paper we present a Fabry-Perot device where mode conversion (LP/sub 01/-LP/sub 11/) is accompanied by mode reflection. The result is a narrow-band transmission and reflection at resonance used as an output coupler for fiber lasers.

3 citations

Proceedings ArticleDOI
05 Jul 2009
TL;DR: It is proved that the number of excited mode groups depend on spot radius beam when the fiber is excited with a Gaussian input beam and it is demonstrated that a good frequency response of system with a proper wavelength value and under an optimal launching condition can decrease the modal dispersion effects of multimode optical fiber.
Abstract: In this work, we have studied chromatic and modal dispersion of silica graded-index optical fibers as a function of mode depending parameters and a lunching condition in local area network (LAN) context. We have investigated mode-depending parameters, namely modal delay, modal attenuation and mode-coupling effects as a function of wavelength. We have proved that the number of excited mode groups depend on spot radius beam when the fiber is excited with a Gaussian input beam. On the other hand, we have demonstrated that we can get a good frequency response of system with a proper wavelength value and under an optimal launching condition in order to decrease the modal dispersion effects of multimode optical fiber. Finally, we have investigated the transfer function of MMF with taking into account chromatic and modal dispersion and considering two structured of studied optical fiber.

3 citations

Journal ArticleDOI
01 Jan 2017
TL;DR: In this paper, a method for design and computing parameters of precision spatial positioning scheme for mode division multiplexing (MDM) system channels placement over optical fiber core end is presented.
Abstract: This work presents fast and simple method for design and computing parameters of precision spatial positioning scheme for mode division multiplexing (MDM) system channels placement over optical fiber core end. Proposed solution is based on combination of well known mode field overlap integral method and earlier on developed modified Gaussian approximation. Computation results showed that fitting of MDM channel mode field radius and its corresponding offset launching position in relation to optical fiber core center provides transmission of the almost total channel injected mode power to only one particular excited fiber mode with the same azimuthal order. This work presents results of proposed method approbation for computation of spatial positioning scheme for modes of 5-channel MDM system placement over few-mode optical fiber 42/125 core end.

3 citations

Patent
13 Feb 1982
TL;DR: In this paper, a core diameter expansion part is provided on a multimode optical fiber to make a mode scrambler small and to reduce a speckle noise, by heating a prescribed area of the optical fiber 8 to a high temperature from the surrounding part.
Abstract: PURPOSE:To make a mode scrambler small-sized and to reduce a speckle noise, by providing a core diameter expansion part on a multimode optical fiber. CONSTITUTION:When a core diameter expansion part, which has been formed in a convex part 10 which is almost symmetrical to a fiber axis or in an asymmetrical convex part 10', and which has a radius of curvature which is 2-3 times as large as a radius of a core 9, is provided on a part of a multimode optical fiber 8, a light beam of plural modes, which has been transmitted into the optical fiber and is capable of interference, is reflected and stirred by the curved surface of the core in this core diameter expansion part, and is dispersed to much more modes, and mode mixing is executed. This core diameter expansion part is formed by equally heating a prescribed area of the optical fiber 8 to a high temperature from the surrounding part by means of electric discharge heating, etc., and by putting force in the axial direction of the optical fiber to the heating area from both sides of the heating area.

3 citations

Patent
15 Mar 2013
TL;DR: In this paper, a fiber optic mode scrambler component and a method of making the same is described, which consists of a multi-mode optical fiber (10, 30, 40, 50) comprising a core (12) and a cladding (14) around the core and a non-adiabatic cross-sectional shape change zone (16) in the optical fiber.
Abstract: The invention relates to a fiber optic mode scrambler component and method of making the same. The mode scrambler comprises a multi-mode optical fiber (10, 30, 40, 50) comprising a core (12) and a cladding (14) around the core (12) and a non-adiabatic cross-sectional shape change zone (16) in the optical fiber (10, 30, 40, 50). According to the invention, the fiber (10, 30, 40, 50) further comprises a bending region (20) extending over a length of the optical fiber (10, 30, 40, 50), the optical fiber (10, 30, 40, 50) having a non-zero curvature at the bending region (20), and means for maintaining said curvature of the optical fiber (10, 30, 40, 50) at the bending region (20). The invention allows for providing mode scramblers which are accurately adjusted to match with different desired optical characteristics, and a well-controllable manufacturing method for the mode scrambler.

3 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20234
202220
20213
20202
20196
20186