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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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Proceedings ArticleDOI
TL;DR: A powerful analysis scheme is presented that removes several of those limitations and pushes modal content analysis to a new level in fiber properties and system performance.
Abstract: Characterization of spatial mode content and dispersion properties in fiber laser systems and space-division multiplexing (SDM) applications is key to understanding fiber properties and system performance. Several techniques exist for modal characterization but often present limitations in the context in which they can be used efficiently. In this paper, we present a powerful analysis scheme that removes several of those limitations and pushes modal content analysis to a new level.

5 citations

Proceedings ArticleDOI
TL;DR: In this paper, a new fiber-chip edge coupler concept with large mode size for coupling to sub-micrometer silicon photonic wire waveguides is presented, which allows direct coupling to conventional SMF-28 optical fiber and circumvents the need for lensed fibers.
Abstract: Fiber-chip edge couplers are extensively used in integrated optics as one of the key structures for coupling of light between planar waveguide circuits and optical fibers. In this work, a new fiber-chip edge coupler concept with large mode size for coupling to submicrometer silicon photonic wire waveguides is presented. The coupler allows direct coupling to conventional SMF-28 optical fiber and circumvents the need for lensed fibers. We demonstrate by simulations a 95% mode overlap between the mode at the chip facet and a high numerical aperture single mode optical fiber with 6 μm mode field diameter (MFD). We also demonstrate a modified design with 89% overlap between the mode at the chip facet and a standard SMF-28 fiber with 10.4 μm MFD. The coupler is designed for 220 nm silicon-oninsulator (SOI) platform. An important advantage of our coupler is that large mode size is obtained without the need to increase buried oxide (BOX) thickness, which in our design is set to 3 μm. This remarkable feature is achieved by implementing in the SiO2 upper cladding two thin high-index Si3N4 layers. The high-index layers increase the effective refractive index of the upper cladding layer near the facet and are gradually tapered out along the coupler to provide adiabatic mode transformation to the silicon wire waveguide. Simultaneously, the Si-wire waveguide is inversely tapered along the coupler. The mode overlap at the chip facet is studied using a vectorial 2D mode solver and the mode transformation along the coupler is studied by 3D Finite-Difference Time-Domain simulations. The couplers are optimized for operating with transverse electric (TE) polarization and the operating wavelength is centered at 1.55 μm.

5 citations

Journal ArticleDOI
TL;DR: In this paper, a singlemode fiber polarization scrambler based upon a simple fiber-ring structure and usable with a narrowband light source is described, which eliminates the effects of induced polarization fluctuation in a polarization-sensitive fiber-optic system.

5 citations

Journal ArticleDOI
TL;DR: A novel type of mode coupler consisting of two identical rectangular few-mode waveguides with different orientations is proposed and numerical simulation indicates that mode extinction ratio exceeding 20dB can be achieved by well-aligned waveguide.
Abstract: We propose a novel type of mode coupler consisting of two identical rectangular few-mode waveguides with different orientations. Numerical simulation indicates that mode extinction ratio exceeding 20dB can be achieved by well-aligned waveguides.

5 citations

Journal ArticleDOI
TL;DR: A general design rule of scrambling-type mode (de)multiplexers (mode scramblers) based on silica planar lightwave circuit (PLC) with small mode-dependent-loss (MDL) is presented for a mode-division multiplexing (MDM) system.
Abstract: A general design rule of scrambling-type mode (de)multiplexers (mode scramblers) based on silica planar lightwave circuit (PLC) with small mode-dependent-loss (MDL) is presented for a mode-division multiplexing (MDM) system. First, we consider four- and eight-mode scramblers and demonstrate that if the number of modes is 2N, it is possible to construct small-MDL mode scramblers by using Y-branch waveguides and mode rotators. Next, a 6-mode scrambler, which can be used for four linearly polarized (LP) mode transmission in MDM system, is considered, and the MDL is large if Y-branch waveguides are cascaded simply, originating from the radiation loss of unwanted modes at the Y-branch. We propose a 2 + 4-type mode scrambler by combining 2- and 4-mode scramblers and demonstrate that it is possible to design a small MDL 6-mode scrambler.

5 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20234
202220
20213
20202
20196
20186