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In this paper we propose and demonstrate a novel all-fiber fused-type mode selective coupler (MSC) that capable of converting LP01 mode to LP11 mode with high efficiency and purity. Unlike other coupler fabrication techniques for which single mode fiber (or few mode fiber) must be pre-tapered, the advantage of our proposed coupler is that pre-tapering is not required. Two different fibers of the MSC...
Small-period long-period gratings (SP-LPGs) have been fabricated by a UV laser of 244 nm in hydrogen-loaded single mode fibers (SMFs). The period of the SP-LPG is determined to be 25 μm by a custom-designed amplitude mask, which is placed close to the SMF. The fabricated SP-LPGs were annealed at 80°C for 48 h to stabilize the property. The transmission spectrum measured with non-polarized light clearly...
The control of Light velocity is theoretically and experimentally demonstrated in a θ-shaped microfiber resonator with coupled-resonator-induced transparency. By adjusting the structure parameters, group delays from −60ps to 200ps are achieved in the all-fiber resonator.
A compact θ shaped microfiber resonator for multifunctional, tunable and wideband filter is proposed. The filtering performance of reflection and transmission spectra depending on coupling coefficients and cavity length is theoretically investigated and experimentally demonstrated.
We propose a novel fiber converting input circular polarized light to orbital angular momentum (OAM) modes. We show the generation of up to 8 OAM modes with 30-dB extinction ratio and mode purity of >96.4% using <10-mm-long fiber.
A low insertion loss optical coupler is designed using chirped high-contrast-grating hollow-core waveguide. 100% tuning of power coupling ratio is realized through mechanically adjusting the waveguide height by ∼3 um.
We propose a fiber coupler to generate up to ten orbital angular momentum modes, which can be generated with 20-dB extinction ratio and mode purity of >99% using a 2-mm-long fiber. The fiber design can be extended to enable all-fiber spatial mode (de)multiplexing.
For thermal design and assembly reason, there inevitably exist thermal aperture arrays and slots on computer enclosure, so electromagnetic pulse will get into enclosure through these apertures, which is called “back-door coupling”. This paper simulates and computes the computer enclosure's apertures coupling effects caused by electromagnetic pulse by using Transmission Line Matrix Method (TLM). Change...
We propose a very short polarization splitter/combiner using two horizontally-slotted waveguides. A 46.7-mum conversion length is achieved with 22 dB extinction ratio. The bandwidth is 18 nm for ER>20 dB.
We propose an ultra-short broadband 90deg polarization rotator using wave coupling through a multimode waveguide. A 21-mum conversion length is achieved with 17 dB extinction ratio.
An embedded-ring-based modulator is proposed for 40-Gb/s signal generation, with compact chip-size and enhanced tolerance to cavity loss and fabrication-induced coupling variation. The modulated signal with negative chirp exhibits penalty-free transmission of 6.5 km, with a drive voltage lower by 40%.
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