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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Journal Article•
TL;DR: In this paper, the dependence of spectrum of transmitted signal and parameters of single mode optical fiber on its bandwidth is analyzed, where wide spectrum of signal reduces bandwidth in a large degree.
Abstract: Dependence of spectrum of transmitted signal and parameters of single mode optical fiber on its bandwidth is analyzed. Wide spectrum of signal reduces bandwidth in a large degree. Length of fiber also significantly reduces bandwidth of single mode fiber. Streszczenie. Przeprowadzono analize zalezności pasma światlowodu jednomodowego w zalezności od jego parametrow i widma sygnalu. Szerokie widmo sygnalu oraz dlugośc wlokna znacznie redukują pasmo światlowodu (Wplyw dyspersji na pasmo światlowodu jednodomowego).
1 citations
Patent•
17 Jun 2014
TL;DR: In this article, the authors proposed a method for characterizing mode group properties of multimodal light traveling through an optical component, comprising: providing a Mode Group Separating optical fiber in an optical path between a light source and said optical components, launching reference pulses of light with a wavelength λt from said light source through said mode group separating optical fiber into said optical component at discrete intervals between a core center and a core radius of said fiber.
Abstract: The invention concerns a method for characterizing mode group properties of multimodal light traveling through an optical component, comprising: - providing a Mode Group Separating optical fiber in an optical path between a light source and said optical components - launching reference pulses of light with a wavelength λt from said light source through said Mode Group Separating optical fiber into said optical component at discrete intervals between a core center and a core radius of said fiber. The Mode Group Separating optical fiber is a multimode fiber with an a-profile graded index core with an α-value chosen such that said fiber satisfies the following criterion at the wavelength λt : formula (I) where: - Δ Ƭ is a time delay difference between consecutive mode groups; - L is a length of said fiber; - Δ T REF is a Full Width at Quarter Maximum of said reference pulses.
1 citations
TL;DR: In this article, the authors studied the change of the fiber's output beam when the axis of the input beam is shifted a small angle off the optical fiber through the anlysis of the output distribution.
Abstract: The far-field pattern of fiber output beam changes dramatically due to different positions and angles of the input beam on fiber.This paper studies the change of the fiber's output beam when the axis of input beam is shifted a small angle off the axis of optical fiber through the anlysis of the fiber's output distribution.Fiber coupling theory indicates that the fiber macrobending leads to mutual coupling of fiber mode,so an improvement of fiber transmission with a mechanical scrambler which gives certain pressure to bend parts of fiber is designed.The collected output spots in different off-axis angles and scrambling degree are taken by median filtering and Gaussian fitting approaches.The scrambling effects are measured mainly through the profile of radial intensity distribution as well as its fitting degree of Gaussian distribution and the change of the energy ratio between different output focal ratio and input.
1 citations
TL;DR: In this article, a single mode CO2 laser cavity of high Fresnel number was constructed which oscillates in the TEM00 mode without the use of intracavity irises and the radii of curvature of the reflectors were designed using the Gaussian beam equations of Kogelnik and Li.
Abstract: A method is described for designing a single mode CO2 laser cavity of high Fresnel number which oscillates in the fundamental transverse mode and a single longitudinal mode. A short, large bore cavity was constructed which oscillates in the TEM00 mode without the use of intracavity irises. The radii of curvature of the reflectors were designed using the Gaussian beam equations of Kogelnik and Li and an experimentally determined mode selection parameter.
1 citations
TL;DR: In this article, the flat-top mode flattening from Gaussian beam to a flat top one was achieved by using a 30 μm uniform Yb-doped area in the core center with a refractive index very slightly below that of the background silica glass by 2×10-4.
Abstract: Power scaling of fiber lasers is highly desirable in many applications but is mainly limited by nonlinear effects. Large-mode-area fibers have been used to mitigate this limit, such as the leakage channel fiber (LCF). The mode intensity profile in these fibers typically exhibits Gaussian-like structure with much reduced effective mode-area compared to the physical fiber core area. Thus, a flat-top mode with a uniform intensity distribution is more suitable for larger effective mode-area without having to increase core size. In this work, we demonstrate the first flat-top mode generated in a 50 μm-core Yb-doped LCF fiber. The mode flattening from Gaussian beam to a flat-top one is achieved by using a 30 μm uniform Yb-doped area in the core center with a refractive index very slightly below that of the background silica glass by 2×10-4. The resulting flat-top mode has a significantly increased effective mode area of ~1880 um2, which is ~50% larger than that of a conventional uniform core and ~6 times the effective mode area of the flat-top mode record demonstrated previously. A 6m-long fiber is also tested in a laser configuration with a slope efficiency of ~84% at 1026 nm with respect to the absorbed pump power at 976 nm.
1 citations