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Ageoshimo, Japan

Patent
Optoquest Co. and National Institute Of Information And Communications Technology | Date: 2012-06-12

A wavelength selective polarization controller capable of controlling the polarization plane of optical wavelength multiplexing signals, for each wavelength component, and which does not generate time lag between each component is provided. This wavelength selective polarization controller has: a telecentric optical system to which optical wavelength multiplexing signals are incident; a polarization controller that controls the polarization plane of light output from the telecentric optical system; and an output optical system for outputting to an optical path output from the polarization controller. The telecentric optical system has: a first diffraction grating to which the optical wavelength multiplexing signals are incident; and a first condenser that condenses the optical wavelength multiplexing signals that have passed through the diffraction grating. The polarization controller has a plurality of phase modulators.


Kumagai T.,OPTOQUEST Co. | Tottori Y.,OPTOQUEST Co. | Miyata R.,Kitanihon Electrical Cable Co. | Kajioka H.,Chiyoda Corporation
Applied Optics | Year: 2014

The angle of optical rotation was measured by detecting the phase difference between clockwise and counterclockwise circular polarized light that propagated in a sensing loop. This polarimeter, or glucose sensor, consisted of a Sagnac interference optical system with a polarization-maintaining optical fiber, so it was not affected by the control limitations of the polarization rotation angle or the optical power fluctuation that occurs with scattered light, reflection, or polarization rotation in an optical system. The angle of rotation was measured from the phase difference of the glucose sensor when the concentration of glucose was changed. We confirmed that the resolution of optical rotation was 5 × 10-4deg, and the resolution of the glucose concentration was 1 mg/dl accordingly. The measured specific rotation of glucose was mostly equal to a physical property value. One applications of this glucose sensor is in measuring the blood sugar levels of diabetic patients. © 2014 Optical Society of America. Source


Idris N.A.,Keio University | Yoshizawa K.,Pioneer Corporation | Tomomatsu Y.,Koshin Kogaku Co. | Sudo M.,OPTOQUEST Co. | And 5 more authors.
Optics Express | Year: 2016

We propose an ultra-broadband full-mesh wavelength router supporting the T- and O-bands using 3 stages of cascaded arrayed waveguide gratings (AWGs). The router architecture is based on a combination of waveband and channel routing by coarse and fine AWGs, respectively. We fabricated several T-band-specific silica-based AWGs and quantum dot semiconductor optical ampliers as part of the router, and demonstrated 10 Gbps data transmission for several wavelengths throughout a range of 7.4 THz. The power penalties were below 1 dB. Wavelength routing was also demonstrated, where tuning time within a 9.4-nm-wide waveband was below 400 ms. © 2015 Optical Society of America. Source


Klaus W.,Japan National Institute of Information and Communications Technology | Sakaguchi J.,Japan National Institute of Information and Communications Technology | Puttnam B.J.,Japan National Institute of Information and Communications Technology | Awaji Y.,Japan National Institute of Information and Communications Technology | And 3 more authors.
IEEE Photonics Technology Letters | Year: 2012

In this letter, we report on coupling optics for connecting single-core single-mode fibers with multicore single-mode fibers. After a brief discussion of the options for such coupling systems, we describe our approach of using bulk optics to fabricate low-loss and low-crosstalk devices for both 7-and 19-core multicore fibers with the free-space design approach. This enables the use of the same coupling device with a variety of multicore fibers whose structural parameters differ from one sample to another. We present the results of experimental evaluations of these devices, discuss various causes of insertion loss, and analyze the coupling loss in detail. © 2012 IEEE. Source


Sakaguchi J.,Japan National Institute of Information and Communications Technology | Klaus W.,Japan National Institute of Information and Communications Technology | Puttnam B.J.,Japan National Institute of Information and Communications Technology | Mendinueta J.M.D.,Japan National Institute of Information and Communications Technology | And 11 more authors.
Optics Express | Year: 2014

We report the development of a space division multiplexed (SDM) transmission system consisting of a 19-core fiber and 19-core Erbium-doped fiber amplifier (EDFA). A new 19-core fiber with an improved core arrangement was employed to achieve a low aggregated inter-core crosstalk of -42 dB at 1550 nm over 30 km. The EDFA uses shared free-space optics for pump beam combining and isolation, thus is SDM transparent and has some potential for cost reduction. 19.6 dB to 23.3 dB gain and 6.0 dB to 7.0 dB noise figure were obtained for each SDM channel at 1550 nm. System feasibility for SDM transmission over 1200 km was demonstrated with 100 Gb/s PDM-QPSK signals. ©2013 Optical Society of America. Source

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