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: It is found through experiment and numerical analysis, that an SRS comb in a different mode family with a high quality factor (Q) is excited when the authors pump in a low-Q mode and no transverse mode interaction occurs when they excite in a high- Q mode resulting the generation of a single comb family.
Abstract: Comb generation in different mode families via a stimulated Raman scattering (SRS) process is studied using a silica toroid microcavity. The broad gain bandwidth of SRS in silica allows us to excite longitudinal modes at long wavelengths belonging to mode families that are either the same as or different from the pump mode. We found through experiment and numerical analysis, that an SRS comb in a different mode family with a high quality factor (Q) is excited when we pump in a low-Q mode. No transverse mode interaction occurs when we excite in a high-Q mode resulting the generation of a single comb family. We studied the condition of the transverse mode interaction while varying the mode overlap and Q of the Raman mode. Our experimental results are in good agreement with the analysis and this enables us to control the generation of one- and two-mode combs.
24 citations
Patent•
18 Mar 2014
TL;DR: In this article, an optical system includes a seed optical source configured to provide a seed beam and an optical amplifier configured to receive and amplify the seed beam, and an active optical fiber having a large mode area non-circular and non-elliptical core rotated about a central axis of said active optical fibre to provide modal discrimination and fundamental mode output.
Abstract: Optical fibers are provided for modal discrimination which include a central core and a cladding disposed about the central core. The central core has a non-circular and non-elliptical cross-section, and it is rotated about a central axis of the optical fiber along the length of the optical fiber at a selected pitch resulting in the capability of a fundamental mode beam output for large core sizes. An optical system includes a seed optical source configured to provide a seed beam and an optical amplifier configured to receive and amplify the seed beam. The optical amplifier also includes an active optical fiber having a large mode area non-circular and non-elliptical core rotated about a central axis of said active optical fiber to provide modal discrimination and fundamental mode output.
24 citations
05 Jul 2010
TL;DR: In this paper, a single mode field generation technique using a transmissive spatial light modulator and a set of lenses is proposed and demonstrated experimentally to mitigate modal dispersion in MMF.
Abstract: For a conventional launch into an MMF, a large number of modes are excited, entailing significant modal dispersion and limiting the bandwidth of the MMF link. To mitigate modal dispersion in MMF, a new single mode field generation technique using a transmissive spatial light modulator and a set of lenses is proposed and demonstrated experimentally. The rapid reconfiguration speed of the SLM surmounts the mode switching limitations of previous single mode field generation techniques while allowing for adaptive updating of the incident field on the MMF. For modes up to azimuthal and radial mode numbers of 4, the generated modal electric fields achieved high power coupling efficiencies, in the range of 90.15% to 95.79%.
24 citations
Patent•
16 Mar 2001
TL;DR: In this article, a power of at least one wavelength of the optical signal is coupled from a first mode to a second mode of the waveguide and the power of the signal is measured at a detector.
Abstract: A method of measuring a power spectrum of an optical signal. The optical signal is transmitted through an optical fiber. A power of at least one wavelength of the optical signal is coupled from a first mode to a second mode of the waveguide. The power of the optical signal coupled from the first mode to the second mode is measured at a detector.
24 citations
Patent•
23 Dec 2004
TL;DR: In this article, a modal index of the signal optical mode or a modality of a loss optical mode spatially varies along a signal propagation direction within the optical waveguide, or the loss optical modes is optically damped as it propagates along the waveguide.
Abstract: An optical waveguide includes a set of diffractive elements. The diffractive element set routes within the waveguide a diffracted portion of an input optical signal between input and output optical ports. The input optical signal is successively incident on the diffractive elements. The optical signal propagates in the waveguide in a corresponding signal optical transverse mode substantially confined in at least one transverse dimension. A modal index of the signal optical mode or a modal index of a loss optical mode spatially varies along a signal propagation direction within the optical waveguide, or the loss optical mode is optically damped as it propagates along the optical waveguide. Said signal modal index variation, said loss modal index variation, or said loss mode damping yields a level of optical coupling between the signal optical mode and the loss optical mode at or below an operationally acceptable level.
24 citations