Ichikawa, Japan
Ichikawa, Japan

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Tanizawa K.,Japan National Institute of Advanced Industrial Science and Technology | Matsuura H.,Japan National Institute of Advanced Industrial Science and Technology | Kaneko T.,Sumitomo Electric Industries | Banno E.,Sumitomo Electric Industries | And 9 more authors.
Optics Express | Year: 2013

We demonstrate sub-millisecond tuning of a prototype parametric tunable dispersion compensator (P-TDC) based on cascaded polarization-diverse four-wave mixing (FWM) process with a fast tunable and highly wavelength-stable pump light source. The pump light source is developed using a tunable distributed amplification chirped sampled grating distributed reflector laser that is fully wavelength tunable by on-chip heaters with a 3-dB frequency response of 45 kHz, resulting in fast dispersion tuning of less than 50 μs without additional timing jitter. The PTDC is developed as the first prototype to satisfy essential requirements for practical network uses: stable input-polarization diversity, input-wavelength preservation, and seamless dispersion tunability for entire C-band input wavelengths are simultaneously achieved. ©2013 Optical Society of America.


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.


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.


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.


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.


Mishima N.,Trimatiz Ltd | Sato N.,Trimatiz Ltd | Oikawa Y.,Trimatiz Ltd | Shiga N.,Trimatiz Ltd
2011 Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference, OFC/NFOEC 2011 | Year: 2011

A novel reflection type VOA with a trapezoid bar PLZT is proposed. The drive voltage can be reduced by minimizing the electrode gap. This VOA has realized a small Vπ of a quarter of the conventional value or less. It is difficult to support a fast response and a low loss simulta-neously. The VOA has overcome this difficulty by using the novel trapezoidal PLZT and has achieved a 400-ns response with a 27-V drive voltage and a 1.5-dB loss simultaneously. © 2011 Optical Society of America.


Shiga N.,Trimatiz Ltd | Sato N.,Trimatiz Ltd | Ota K.,Trimatiz Ltd | Petit S.,Trimatiz Ltd | Oikawa Y.,Trimatiz Ltd
Optical Fiber Communication Conference, OFC 2013 | Year: 2013

We have developed a digitally controlled AGC-EDFA by combining an FF-controlled pump-LD and a high-speed FB/FF-controlled VOA. We realized a gain excursion of less than 0.5 dB for a wide operation range. © 2013 OSA.


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.


Oikawa Y.,Trimatiz Ltd | Sato N.,Trimatiz Ltd | Ota K.,Trimatiz Ltd | Petit S.,Trimatiz Ltd | Shiga N.,Trimatiz Ltd
2012 Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference, OFC/NFOEC 2012 | Year: 2012

We have developed a digitally controlled AGC-EDFA by combining an FF-controlled pump-LD and an FF-controlled VOA. We realized a gain excursion of less than 0.2 dB at a 100-channel add/drop equivalent operation. © 2012 OSA.


Patent
Trimatiz Ltd. | Date: 2010-03-31

A high-speed optical amplifier is considered to be an important optical device because of an increasing demand of routing, which is accompanied by an increase in complexity of networks. It is difficult to satisfy a response performance by related-art techniques, and there has been a problem in achieving a high-speed response performance of 10 microseconds or less. An optical amplifier according to the present invention includes: an input monitor means 500; an optical amplification means 310 including an optical amplification medium 300, and a control means 400 for performing feed-forward control. When the optical, amplification means is controlled by the feed-forward control in response to a signal of the input monitor means 500, an overshoot signal is applied as a control signal so that a slow response performance specific to the optical amplification medium has been improved, and thereby high-speed response performance has been achieved.

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