Journal ArticleDOI
Micro-optic devices for fiber-optic communications
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TLDR
In this article, the beam transformation in a graded index rod (beam undulation and beam size change), in association with reflection or refraction at a grade index rod facet, is proposed to realize coupling/branching in fiber-optic communications.Abstract:
A novel approach, “micro-optics”, is proposed to realize coupling/branching in fiber-optic communications. The operation is based on the beam transformation in a graded index rod (beam undulation and beam size change), in association with reflection or refraction at a graded index rod facet. Small-size couplers/dividers have been devised by inserting a semitransparent mirror between the facets of two graded index rods with a length of a quarter of the undulation period. Their best features are small size, simple structure, low insertion loss, and wide application areas. An excess insertion loss as low as 0.5 dB has been realized in a 3-dB divider with SELFOC® rods. As further applications of them, wavelength division multiplexers/demultiplexers have been developed by replacing the semitransparent mirror with a dielectric interference filter. An insertion loss of as low as 1.2 dB and isolation of more than 20 dB for wavelength separation of 20 nm have been realized. Results are also shown on the o...read more
Citations
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Theoretical analysis of optical fiber laser amplifiers and oscillators
TL;DR: This study predicts optimum fundamental mode oscillation in fibers with a V number of 5-25 with submilliwatt thresholds and nearly quantum-limited conversion efficiencies.
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Stacked planar optics: an application of the planar microlens
TL;DR: This paper presents a new development of the distributed-index planar microlens of 2.5-3-mm focal length and 0.15 N.A. and shows that it is usable with optical components in fiber communications and proposes a concept of stacked planar optics consisting of a stack of arrayed planarmicrolenses and other optical components.
Journal ArticleDOI
Applications of GRIN-rod lenses in optical fiber communication systems.
TL;DR: In this article, the authors present a detailed review of the performance of various GRIN-rod lens devices, including connectors, attenuators, directional couplers, switches, isolators and wavelength division multiplexers.
Journal ArticleDOI
Microoptic grating multiplexers and optical isolators for fiber-optic communications
Kohroh Kobayashi,M. Seki +1 more
TL;DR: In this paper, Grating multiplexers and isolators for 0.8 μm band employing micro-optic approach have been developed for increasing further the utility of and to expand the application of fiberoptic communications.
Journal ArticleDOI
Lens coupling in fiber-optic devices: efficiency limits.
TL;DR: It is turned out that equivalent lenses in a well-designed coupling have nearly the same aberration, and valuable relations between the coupling efficiency and the optimal lens parameters are derived.
References
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Optical characteristics of a light-focusing fiber guide and its applications
TL;DR: In this article, a lens-like glass fiber guide with a parabolic variation of refractive index has been developed, which has the following characteristics: simultaneous transmission of laser beams modulated by wide-band signals through narrow space; optical image transmission; realization of a lens with tiny aperture or with extremely short focal length.
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Fiber optic directional coupler
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Journal ArticleDOI
Optical directional coupler using tapered sections in multimode fibers
Takeshi Ozeki,B.S. Kawasaki +1 more
TL;DR: In this article, an optical directional coupler with high efficiency has been fabricated using tapered sections in multimode fibers, where some of the higher-order modes are converted into radiation modes launched into a clear adhesive and subsequently reconverted into guided modes of two arms of the coupler.
Journal ArticleDOI
High-speed digital-signal transmission experiments by optical wavelength-division multiplexing
Shigetoki Sugimoto,K. Minemura,Kohroh Kobayashi,Masafumi Seki,Minoru Shikada,Atsufumi Ueki,Tomoo Yanase,Tetsuya Miki +7 more
TL;DR: In this paper, the results obtained with laboratory transmission experiments on high-speed digital signals by optical wavelength-division multiplexing, using a newly developed optical multiplexer and demultiplexer, as well as other high-performance optical devices and fibres.