Topic
Guided wave testing
About: Guided wave testing is a research topic. Over the lifetime, 4884 publications have been published within this topic receiving 79633 citations.
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TL;DR: In this article, a 3D nonstationary analysis of quasi-phase matched (QPM) second-harmonic generation in an optical waveguide with a periodic domain-inversion structure is proposed.
Abstract: A three-dimensional (3-D) nonstationary analysis method is proposed for the quasi-phase-matched (QPM) second-harmonic generation in an optical waveguide with a periodic domain-inversion structure. In this method, a 3-D modeling of a waveguide-type QPM is made possible by combining the mode coupling theory with the weighted-index method (WIM) which is a highly accurate approximate analysis method for an optical channel waveguide. As an example of application, the effect of the channel dimensions on the conversion efficiency is studied for a proton-exchanged LiNbO3 waveguide with a rectangular-shaped inverted domain. The actual domain-inversion shape is expected to be different, depending on the type of substrate material and inversion process. The present method is also applicable to an arbitrary inverted-domain shape. Hence, the method is considered to be extremely useful for an actual device design.
TL;DR: The development and applications of LiNbO3 optical guided-wave modulators are reviewed in this article, where it is shown that they are effective devices to evaluate waveguide characteristics, in particular the properties of proton-exchanged guides.
Abstract: The development and applications of LiNbO3 optical guided-wave modulators is reviewed. These devices are single-mode waveguide versions of Mach-Zehnder interferometers and are formed by diffusion of Ti into LiNbO3. Optical circuits which contain modulator arrays are under development for applications in high-speed analog-to-digital (A/D) conversion, picosecond sampling, optical logic, frequency modulation and optical temperature sensing. In addition, it is shown that the modulators are effective devices to evaluate waveguide characteristics, in particular the properties of proton-exchanged guides.
Patent•
08 Nov 2018
TL;DR: In this paper, an optical fiber has a micro-nano structure resonance cavity on a metallic film and generates surface plasmon resonance when an optical-fiber guided wave is incident.
Abstract: An optical fiber having metallic micro/nano-structure on end-facet, and a fabrication method and an application method thereof. The metallic micro/nano-structure is a micro-nano structure resonance cavity on a metallic film, and generates surface plasmon resonance when an optical fiber guided wave is incident. In the fabrication method according to the present invention, the metallic micro/nano-structure on the surface of the substrate is aligned with and is adhered to the end-facet of the optical fiber, and is removed for transferring to the end-facet of the optical fiber. In the application method according to the present invention, the end-facet of the optical fiber is contacted with or moved towards a medium, and a refractive index of the medium is measured by measuring reflection of an optical fiber guided wave by the metallic micro/nano-structure resonance cavity.