Journal ArticleDOI
Characteristics of a hemispherical microlens for coupling between a semiconductor laser and single-mode fiber
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TLDR
In this article, a hemispherical microlens is fabricated on the end of a single-mode fiber by an electric arc discharge technique, which improves coupling efficiency between InGaAsP lasers with buried heterostructure geometry and singlemode fiber.Abstract:
A hemispherical microlens is fabricated on the end of a single-mode fiber by an electric arc discharge technique. It improves coupling efficiency between InGaAsP lasers with buried heterostructure geometry and single-mode fiber. The lowest coupling loss of 2.9 dB is achieved with the optimum lens radius of 8.5 μm. This loss is 4.4 dB lower than that with a butt joint. Experimental results of coupling efficiency and alignment tolerances in coupling with different lens radii in the range of 3.5-17 \mu m are discussed in detail. The results are in good agreement with theoretical values derived by Gaussian beam and paraxial ray approximations.read more
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Catheterscope 3D Guidance and Interface System
TL;DR: In this article, an endoscope is used to guide an ultra-thin flexible endoscope to a predetermined region of interest within a lung during a bronchoscopy procedure, which can be an opacity-identified by non-invasive imaging methods, such as high-resolution computed tomography (HRCT) or as a malignant lung mass that was diagnosed in a previous examination.
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Coherent optical fiber transmission systems
Yoshihisa Yamamoto,T. Kimura +1 more
TL;DR: In this paper, the feasibility of coherent optical fiber transmission systems was studied from the view point of device and system consideration and expected performance, in which laser coherence is utilized to carry information.
Patent
Micro-fabricated optical waveguide for use in scanning fiber displays and scanned fiber image acquisition
TL;DR: In this article, the scanning waveguide has a distal portion on which is formed a non-linear taper with a diameter that decreases toward the distal end of the waveguide.
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Optical beam scanning system for compact image display or image acquisition
TL;DR: An optical fiber having a reduced cross-sectional region adjacent to its distal end, which is fused to an optical component, is vibrated, rotating the optical component to scan a region as discussed by the authors.
Journal ArticleDOI
Ideal microlenses for laser to fiber coupling
TL;DR: In this paper, the design and fabrication of ideal microlenses for semiconductor laser to fiber coupling are reported, which can theoretically collect 100% of the radiated energy of a modal-symmetric laser source.
References
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Light transmission optics
TL;DR: Light transmission optics, light transmission optics as discussed by the authors, Light transmission optics, مرکز فناوری اطلاعات, ا�ل-اع رسانی,
Journal ArticleDOI
Ultimate low-loss single-mode fibre at 1.55 μm
TL;DR: In this article, a very low loss singlemode fiber with a minimum loss of 0.20 dB/km at a wavelength of 1.55 μm is attained; this loss reaches the ultimate lower loss limit of silica-based optical glass fibre.
Journal ArticleDOI
Microlenses for coupling junction lasers to optical fibers.
TL;DR: A novel photolithographic technique was used to make hemispherical and hemicylindrical microlenses, with diameters between 4 microm and 10 microm, from commercially available negative type photoresist that is transparent at ir laser wavelengths.
Journal ArticleDOI
Semiconductor laser to single-mode fiber coupler.
TL;DR: The cylindrical lens method is shown to be most efficient, with a coupling loss of 1.8 dB under optimum alignment conditions, and the optimum radius of a cylINDrical lens, which gives maximum coupling efficiency, is derived by theoretical calculation, using the ray matrix method.
Journal ArticleDOI
New coupling method for GaAs-laser--fibre coupling
TL;DR: In this paper, a method for coupling a diode laser to an optical fiber was described, which uses a cylindrical glass fibre as a focusing element and showed that optical feedback from the fiber endface has an influence on the laser output power.
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