Topic
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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04 Nov 2010
TL;DR: In this paper, stable MIMO transport of three channels over a two-mode fiber was shown in the presence of fiber bending induced mode coupling, enabled by a new adiabatic mode splitter output coupler.
Abstract: Simulations confirm stable MIMO transport of three channels over a two mode fiber — even in the presence of fiber bending induced mode coupling — enabled by a new adiabatic mode splitter output coupler.
19 citations
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TL;DR: In this article, the authors demonstrate selective spatial mode amplification in a few mode, double-clad Yb-doped large mode area (LMA) fiber, utilizing an all-fiber photonic lantern.
Abstract: We demonstrate selective spatial mode amplification in a few mode, double-clad Yb-doped large mode area (LMA) fiber, utilizing an all-fiber photonic lantern. Amplification to multi-watt output power is achieved while preserving high spatial mode selectivity. We observe gain values of over 12 dB for all modes: LP01, LP11a, and LP11b, when amplified individually. Additionally, we investigate the simultaneous amplification of LP01+LP11a and LP11a+LP11b, and the resultant mode competition. The proposed architecture allows for the reconfigurable excitation of spatial modes in the LMA fiber amplifiers, and represents a promising method that could enable dynamic spatial mode control in high power fiber lasers.
18 citations
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TL;DR: It is shown that a mode coupling coefficient can be calculated from each mode group pulse waveform, and in the fiber sheathed by nylon, there existed a strong mode coupling in lower order modes.
Abstract: The measuring method of the mode coupling coefficient was developed to apply to multimode fibers. It is shown that a mode coupling coefficient can be calculated from each mode group pulse waveform. Measurements were made with two cases of long-length and short-length multimode step-index fibers. As a result, it was observed that in the fiber sheathed by nylon, there existed a strong mode coupling in lower order modes. When it is assumed that this mode coupling is generated by microbendings, the correlation length and standard deviation of the curvature were estimated as 2.0 mm and 4.2 × 10−4 mm−1, respectively.
18 citations
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09 Feb 2009
TL;DR: In this article, a technique for generating a cylindrically polarized beam, e.g., a radially or azimuthally polarized beam is described, where an input optical fiber is provided that supports signal propagation in a fundamental LP 01 mode.
Abstract: A technique is described for generating a cylindrically polarized beam, e.g., a radially or azimuthally polarized beam. An input optical fiber is provided that supports signal propagation in a fundamental LP 01 mode. A mode converter device converts the fundamental LP 01 mode into a higher-order LP 11 mode output that includes a linear combination of modes, including cylindrically polarized TM 01 and TE 01 modes and mixed HE 21 (even) and HE 21 (odd) modes. The LP 11 mode output propagates through a connected phase-engineered fiber having a refractive index profile that includes a steep refractive index step proximate to a peak amplitude of a mode intensity profile of the LP 11 mode, such that at least one cylindrically polarized mode has an effective refractive index that is sufficiently separated from those of the mixed modes to allow for coupling to the at least one cylindrically polarized mode with minimal cross-coupling.
18 citations
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TL;DR: A polarization dependent mode amplification is found that is in good agreement with recent experimental results and the derivation of the modal powers and modal polarization states is found.
Abstract: We model the transverse mode interaction in a large-mode-area fiber amplifier by solving the Fresnel wave equation including local gain saturation. In order to calculate the electric field distribution we apply a finite difference beam propagation method, which is followed by the derivation of the modal powers and modal polarization states. A polarization dependent mode amplification is found that is in good agreement with recent experimental results.
18 citations