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Ichikawa, Japan

Yamada M.,Osaka Prefecture University | Kinoshita T.,Osaka Prefecture University | Kimura Y.,Osaka Prefecture University | Koyama O.,Osaka Prefecture University | Sato N.,Trimatiz Ltd.
2014 OptoElectronics and Communication Conference, OECC 2014 and Australian Conference on Optical Fibre Technology, ACOFT 2014 | Year: 2014

We propose a novel method for evaluating the scattering pattern of the light that generates an optical fiber fuse during the hole formation stage of the optical fiber fuse phenomenon when the fiber fuse is occurring continuously. We found that the directivity of the scattering light is low, and the light could be identified as a dispersion light as regards the safety of laser products. It was estimated that the maximum scattered light power during optical fiber fuse propagation could be dealt with as a class 1 product when the incident light power launched into the optical fiber was several tens of watts. © 2014 Engineers Australia. Source


Kinoshita T.,Osaka Prefecture University | Sato N.,Trimatiz Ltd. | Yamada M.,Osaka Prefecture University
2013 18th OptoElectronics and Communications Conference Held Jointly with 2013 International Conference on Photonics in Switching, OECC/PS 2013 | Year: 2013

We propose a novel system that precisely detects and unfailingly stops a propagating optical fiber fuse (FF). This system monitors the peculiar luminescence observed with the FF phenomenon, and the output of the laser light source that causes the FF is discontinued based on the monitored result. We confirm that FF propagation can be terminated with certainty a few tens of milliseconds after the detection of an FF. © 2013 IEICE. Source


Inagaki K.,Japan National Institute of Information and Communications Technology | Kawanishi T.,Japan National Institute of Information and Communications Technology | Ameya M.,Japan National Institute of Advanced Industrial Science and Technology | Kurokawa S.,Japan National Institute of Advanced Industrial Science and Technology | Oikawa Y.,Trimatiz Ltd.
Pacific Rim Conference on Lasers and Electro-Optics, CLEO - Technical Digest | Year: 2013

Uncertainty budget is evaluated on a frequency response measurement system of PDs using heterodyne technique. The extended uncertainty is calculated as ±0.342 dB at 10 GHz. © 2013 IEEE. Source


Inagaki K.,Japan National Institute of Information and Communications Technology | Kawanishi T.,Japan National Institute of Information and Communications Technology | Iwai H.,Trimatiz Ltd. | Oikawa Y.,Trimatiz Ltd.
2014 International Topical Meeting on Microwave Photonics / the 9th Asia-Pacific Microwave Photonics Conference, MWP/APMP 2014 - Proceedings | Year: 2014

In order to measure frequency responses of O/ E conversion devices such as photodiodes (PDs), we developed a measurement instrument named lightwave frequency response analyzer (LFRA). LFRA, which is based on a heterodyne technique utilizing an optical modulator, provides precise measurement solution with cost effective instrument. Measured results of two individual LFRAs show standard deviations less than 0.15 dB and maximum instrument difference less than 0.7 dB. © 2014 IEICE. Source


Tanizawa K.,Japan National Institute of Advanced Industrial Science and Technology | Kurumida J.,Japan National Institute of Advanced Industrial Science and Technology | Ishida H.,Japan National Institute of Advanced Industrial Science and Technology | Oikawa Y.,Trimatiz Ltd. | And 4 more authors.
Optics Letters | Year: 2010

A record-fast, 2 μt;s switching operation of an optical tunable dispersion compensator is demonstrated with a parametric tunable dispersion compensation scheme. We alternately switch two optical paths having different net dispersions with a microsecond guard interval of the compensator response and achieve successful transmissions of 43 Gbit/s non-return-to-zero on-off-keying optical signals. The error-free guard time for the switching of the two optical paths is 125 μs, limited mostly by the clock synchronization of the bit-error detector. The power penalty due to the switching of the compensator is less than 0.5 dB. © 2010 Optical Society of America. Source

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