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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TL;DR: In this paper, a mode scrambler utilizing a sinusoidal bend and a new set-up based on the attenuation-comparison method have been proposed for measuring the frequency response of an optical fiber.
Abstract: For measuring the frequency response of an optical fibre, a mode scrambler utilising a sinusoidal bend and a new set-up based on the attenuation-comparison method have been proposed. Measurements for multimode step-index fibres have revealed that the long-fibre response can be closely predicted from the short-fibre response, using an appropriate choice for the scrambler parameter.
30 citations
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TL;DR: In this paper, a largemode-area single-mode optical fiber based on leaky-mode filtering was prepared by a modified chemical vapor deposition (MCVD) technique, which has a leaky cladding that discriminates the fundamental mode from higher-order modes.
Abstract: A large-mode-area single-mode optical fiber based on leaky-mode filtering was prepared by a modified chemical vapor deposition (MCVD) technique. The fiber has a leaky cladding that discriminates the fundamental mode from higher-order modes. A preliminary version has a 25 μm core diameter and 0.11 numerical aperture. A Gaussian-like mode with 22 μm mode field diameter was observed after 3 m propagation, in agreement with modeling.
30 citations
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TL;DR: In this paper, an integrated piezoelectric transducer is used for direct and parametric excitation of a clamped-clamped beam resonator, where the parametric amplification and oscillation of a single mode are analyzed by the power and phase dependence below and above the threshold for parametric oscillation.
Abstract: The interactions between parametrically- and directly-driven vibration modes of a clamped-clamped beam resonator are studied. An integrated piezoelectric transducer is used for direct and parametric excitation. First, the parametric amplification and oscillation of a single mode are analyzed by the power and phase dependence below and above the threshold for parametric oscillation. Then, the motion of a parametrically-driven mode is detected by the induced change in resonance frequency in another mode of the same resonator. The resonance frequency shift is the result of the nonlinear coupling between the modes by the displacement-induced tension in the beam. These nonlinear modal interactions result in the quadratic relation between the resonance frequency of one mode and the amplitude of another mode. The amplitude of a parametrically-oscillating mode depends on the square root of the pump frequency. Combining these dependencies yields a linear relation between the resonance frequency of the directly-driven mode and the frequency of the parametrically-oscillating mode.
29 citations
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27 Mar 2000
TL;DR: In this article, the distribution structure of the refractive index is designed in such a manner that when light signal enters, three or more modes of linearly polarized waves are present as the propagation modes.
Abstract: PROBLEM TO BE SOLVED: To obtain an optical fiber having a large effective core area, low loss, small absolute value of dispersion and small bending loss susceptibility by controlling the difference in the propagation constant between the lowest mode and the second-order mode to be twice or more of the difference in the propagation constant between adjacent modes of higher-order modes. SOLUTION: The distribution structure of the refractive index is designed in such a manner that when light signal enters, three or more modes of linearly polarized waves are present as the propagation modes. In this state, the difference in the propagation constant between LP01 mode and LP11 mode is specified to be twice or more, preferably three times or more, of the difference in the propagation constant of the LP11 mode or higher-order mode and the adjacent higher mode. As a result, this structure enables such an arrangement of modes that only the LP11 mode or higher-order modes are coupled to the crack mode and that only the LP01 mode substantially propagates after the light propagates at a proper distance. If the difference is less than twice, proper attenuation for only the higher-order modes is impossible and a single mode transmission is made difficult.
29 citations
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TL;DR: A bend insensitive single mode optical fiber with a low-index trench with spot-size definitions and their optimization technique that preserves single mode properties while avoiding bending loss at a 5 mm of bending radius.
Abstract: We have designed a bend insensitive single mode optical fiber with a low-index trench using spot-size definitions and their optimization technique. The bending loss at a 5 mm of bending radius was negligible, while single mode properties were intact.
29 citations