Topic
Mode scrambler
About: Mode scrambler is a research topic. Over the lifetime, 896 publications have been published within this topic receiving 13595 citations.
Papers published on a yearly basis
Papers
More filters
Patent•
26 Jun 1996TL;DR: In this article, a method of controlling an image sensing device which can be operated in two different modes, namely a field mode and a frame mode, is presented, in which the potential of a substrate and the intermediate voltage of pulses to be applied to a vertical transfer unit are set to potentials which are lower than those in the field mode, first.
Abstract: In a method of controlling an image sensing device which can be operated in two different modes, namely a field mode and a frame mode, in a frame mode, a potential of a substrate of the image sensing device and an intermediate voltage of pulses to be applied to a vertical transfer unit are set to potentials which are lower than those in the field mode, first. Then, by changing the potential of the substrate and the intermediate voltage to the same potentials as in the field mode during reading out the first field of the image sensing device, a dynamic range which is as wide as that in the field mode and a charge transfer efficiency which is as well as that achieved in the field mode are realized.
29 citations
TL;DR: In this article, the authors proposed a mode coupling between a square microcavity and a Fabry-Perot (FP) cavity for realizing single mode lasers and demonstrated tunable single mode operation with a continuous wavelength tuning range over 10nm.
Abstract: Mode coupling between a square microcavity and a Fabry-Perot (FP) cavity is proposed and demonstrated for realizing single mode lasers. The modulations of the mode Q factor as simulation results are observed and single mode operation is obtained with a side mode suppression ratio of 46 dB and a single mode fiber coupling loss of 3.2 dB for an AlGaInAs/InP hybrid laser as a 300-μm-length and 1.5-μm-wide FP cavity connected to a vertex of a 10-μm-side square microcavity. Furthermore, tunable single mode operation is demonstrated with a continuous wavelength tuning range over 10 nm. The simple hybrid structure may shed light on practical applications of whispering-gallery mode microcavities in large-scale photonic integrated circuits and optical communication and interconnection.
29 citations
TL;DR: In this paper, the authors demonstrate the effectiveness of another method to suppress the high order modes in large mode area active fibers by optimizing the rare earth dopant concentration across the core while keeping the step index structure of the core of the fiber.
Abstract: Many high power fiber laser applications require doped fibers having large mode area but still working in the single mode regime. The most common techniques to keep a large mode area fiber in the single mode regime are to reduce the core numerical aperture, to strip the high order modes by coiling the fiber, to launch only a single transverse mode, or to use photonic crystal fibers. All these methods have limits and disadvantages.
In this paper we demonstrate by simulation the effectiveness of another method to suppress the high order modes in large mode area active fibers by optimizing the rare earth dopant concentration across the core while keeping the step index structure of the core of the fiber. This method was not previously employed because the traditional doped fiber manufacturing technologies do not have the required capability to radially control the dopant concentration. However, Direct Nanoparticle Deposition (DND) can be used to manufacture large mode area fibers having any radial distribution of active element concentration and any refractive index profile. Thus, DND fibers can be designed to benefit from this high order mode suppression technique.
The simulation results presented in this paper have been obtained using Liekki Application Designer v3.1, a software simulator for fiber lasers and amplifiers.
29 citations
TL;DR: In this article, the internal evolution of light power angular distribution in typical mode scrambling configurations was analyzed by comparing the resultant far fields, obtained either experimentally or computationally, with the experimental equilibrium mode distribution (EMD) far field for the plastic optical fibers (POF) considered, so as to provide an insight that helps to adapt existing scramblers to new types of POF that are coming onto the market.
Abstract: We analyze the internal evolution of light power angular distribution in typical mode scrambling configurations by comparing the resultant far fields, obtained either experimentally or computationally, with the experimental equilibrium mode distribution (EMD) far field for the plastic optical fibers (POF) considered, so as to provide an insight that helps to adapt existing scramblers to new types of POF that are coming onto the market.
29 citations
TL;DR: In this paper, the first measurements of differential mode delay in multimode perfluorinated plastic optical fibers were conducted, showing that intermodal dispersion increases as the square root of fiber length, implying strong mode coupling.
Abstract: Graded-index multimode perfluorinated plastic optical fibers typically exhibit bandwidths much greater than would be expected from their index profiles. To resolve this discrepancy, we have conducted the first measurements of differential mode delay in such fibers. These measurements show intermodal dispersion that increases as the square root of fiber length, implying strong mode coupling in these fibers. Significant power transfer between modes occurs at lengths less than 20 m, so that mode coupling results in improved bandwidth on length scales relevant for local area networks. The observed coupling arises from extrinsic nonuniformities of the waveguide.
28 citations