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 article, the authors demonstrate a high performance fused-type mode selective coupler that couples the LP/sub 11/mode in one fiber and the L 1/sub 01/ mode in another using highly elliptical core two-mode fibers.
Abstract: In this letter, we demonstrate a high performance fused-type mode selective coupler that couples the LP/sub 11/ mode in one fiber and the LP/sub 01/ mode in another using highly elliptical core two-mode fibers. The phase-matching condition was achieved by etching and prepulling portions of two-mode fibers. The coupling efficiency and the mode extinction ratio of 56% to 80% and 22-32 dB, respectively, were achieved with high temperature stability over 1515- to 1595-nm wavelength range.
89 citations
TL;DR: In this paper, a two-mode fiber with a CO2 laser was used for converting the LP01 mode to any of the four higher order cylindrical vector modes or the LP11 modes.
Abstract: We fabricate mode converters by directly writing long-period gratings in a two-mode fiber with a CO2 laser. These mode converters allow the fundamental LP01 mode to be converted to any of the four higher order cylindrical vector modes or the LP11 modes. The transmission characteristics of these devices are insensitive to temperature variations and the mode conversion efficiency is insensitive to the polarization state of the input light. One of our typical gratings, which contains 15 grating periods, can provide a conversion efficiency >99% over a bandwidth of 34.0 nm in the C-band. These robust mode converters could find applications in mode-division-multiplexing systems and other applications that require cylindrical vector modes.
89 citations
TL;DR: A method to separate and monitor the modes in real time is described as the basis of a method to measure the individual modal performance of a component during fabrication.
Abstract: The use of multimode fibers in mode division multiplexed space-division multiplexing systems offers one solution to the capacity limitations of single-mode fiber transmission. Passive components to control the individual modes in few-mode fiber (FMF) are key elements to build more complex modules and components necessary for a high performance system. Fiber-based mode converters are important elements in the FMF mux/demux, and long-period gratings have been investigated to provide mode conversion in two- and four-mode fibers. A method to separate and monitor the modes in real time is described as the basis of a method to measure the individual modal performance of a component during fabrication.
88 citations
TL;DR: In this paper, the authors describe the design and fabrication of an ultracompact optical mode order converter employing submicron waveguides, which can realize optical mode conversion between zeroth and first-order optical modes with a device footprint less than 18 mum by 3 mum.
Abstract: We describe the design and fabrication of an ultracompact optical mode order converter employing submicron waveguides. The mode converter can realize optical mode conversion between zeroth- and first-order optical modes with a device footprint less than 18 mum by 3 mum. The optical mode converter could be employed in various types of photonic integrated circuits where optical mode order conversion is needed
86 citations
TL;DR: In this article, the effect of varying the cladding-core radius ratio on the LP 11 adiabatic criterion is modeled, and a Laguerre-Gaussian beam is created in free space using a spatial light modulator (SLM) and coupled to a few-mode fiber.
85 citations