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Fukushima-shi, Japan

Morimoto M.,FITEL Photonics Laboratory
IEEE Journal on Selected Topics in Quantum Electronics | Year: 2013

In this paper, we propose a novel plasmonic Mach-Zehnder modulator utilizing the quantum interference effect. The modulator controls the oscillations in the electron density along two arms of the Mach-Zehnder interference circuit consisting of metal-dielectric interfaces. The quantum interference effect produces the interference between the electron density oscillations; i.e., magnetic fluxes (vector potentials) or electric voltages (scalar potentials) in the domain bounded by the two arms produce the interference between the two electron waves in the arms of the Mach-Zehnder interferometer. Current flows in or voltages applied to electric wires arranged parallel to the arms regulate the magnetic fluxes or electric voltages. A very small device, on the order of micrometer, low power consumption and ultrafast operation are expected to be a result of the extreme sensitivity of the quantum interference effects to the electromagnetic field. However, successful operation of the proposed modulator requires a coherent plasmon wave, which is extremely difficult to achieve and cannot be achieved in any currently available material. We look forward to the development of such a material. © 2013 IEEE.

Tanizawa K.,Japan National Institute of Advanced Industrial Science and Technology | Kurumida J.,Japan National Institute of Advanced Industrial Science and Technology | Takahashi M.,FITEL Photonics Laboratory | Yagi T.,FITEL Photonics Laboratory | Namiki S.,Japan National Institute of Advanced Industrial Science and Technology
European Conference on Optical Communication, ECOC | Year: 2011

We demonstrate wavelength-preserving parametric tunable dispersion compensator with cascaded polarization-insensitive parametric tunable wavelength conversion based on degenerate FWM in PM-HNLF. Simultaneous dispersion compensation of four channels of 43-Gbit/s NRZ-OOK signal is successfully achieved. © 2011 OSA.

Uchida Y.,FITEL Photonics Laboratory | Kawashima H.,FITEL Photonics Laboratory | Nara K.,FITEL Photonics Laboratory
Furukawa Review | Year: 2010

Recently, new planar lightwave circuit (PLC) components are under study, in response to the requirement of downsizing and cost reduction, to increase their refractive index difference Δ between cladding and core. Accordingly, we are developing 2.5%Δ silica-based PLCs. However, it is difficult to put the 2.5%Δ silica-based PLCs directly into practical applications because their coupling loss with a single-mode fiber is as high as 2.9 dBfacet, raising a need for developing a spot size converter (SSC) to lower the loss. We have designed here, therefore, a new vertical SSC that has a broad core expanded in both horizontal and vertical directions, and fabricated the vertical SSC by combining plasma enhanced chemical vapor deposition (PECVD) and shadow mask. As a result, it has been confirmed that the use of the vertical SSC can significantly reduce the coupling loss between the 2.5%Δ waveguide and fiber to 0.06 dBfacet.

Kobayashi G.,FITEL Photonics Laboratory | Kiyota K.,FITEL Photonics Laboratory | Kimoto T.,FITEL Photonics Laboratory | Mukaihara T.,FITEL Photonics Laboratory
Conference on Optical Fiber Communication, Technical Digest Series | Year: 2014

We demonstrated tunable light source integrated with 12 DR laser array and SOA, for the first time. We could report single-mode operation (SMSR>43dB) and narrow linewidth less than 185kHz over 40nm C-band range. © 2014 OSA.

Tsuchida Y.,FITEL Photonics Laboratory | Maeda K.,FITEL Photonics Laboratory | Tadakuma M.,FITEL Photonics Laboratory | Sugizaki R.,FITEL Photonics Laboratory | And 2 more authors.
COIN 2014 - 12th International Conference on Optical Internet | Year: 2014

We report some recent research activities of multicore EDFAs with cladding-pumped technology. We successfully developed cladding-pumped MC-EDFAs with C-band L-band application, respectively. Cladding-pumped L-band MC-EDFA realized output power of 19 dBm for each core between 1576-1603 nm with 33 % reduced power consumption. © 2014 IEEE.

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