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Tokuhashi K.,Keio University | Ashizawa K.,Keio University | Ishii D.,Keio University | Okamoto S.,Keio University | And 3 more authors.
Optical Switching and Networking | Year: 2012

An active optical access network architecture with our newly developed PLZT ((Pb,La)(Zr,Ti)O 3) high-speed optical switch is introduced, with a view to realizing the next-generation high capacity scalable access network. This system is developed based on the latest IEEE standard of PON (10G-EPON; IEEE802.3av) in consideration of the coordination with future high capacity PON. PLZT high-speed optical switches are able to switch an optical signal at nano-second speed (<510 ns). Generally, the merits of using optical switches are increasing the number of subscribers and transmission distance easily, preventing malicious ONUs from interfacing with the communication between OLT and the other ONUs, realizing fast fiber and OLT protection/restoration and providing various services by controlling optical switches dynamically. This paper focuses on two key technologies; a PLZT optical switch and a new discovery process for active optical access network based on MPCP defined at IEEE802.3. A major challenge in designing active optical access network is supporting the discovery process of MPCP because it does not offer broadcast transmission unlike the regular PON. We propose here a new discovery process; it has been tested successfully in an implementation of our proposed system. © 2011 Elsevier B.V. All rights reserved.


Asakura H.,Keio University | Tsuda H.,Keio University | Nashimoto K.,Epiphotonics Corporation | Kudzuma D.,Epiphotonics Corporation | Hashimoto M.,Epiphotonics Corporation
2012 International Conference on Photonics in Switching, PS 2012 | Year: 2012

A wavelength selective arrayed-waveguide grating (AWG) with 200 GHz channel spacing was fabricated. Buried (Pb, La)(Zr, Ti)O3 (PLZT) waveguides were used to realize a narrow channel spacing of an AWG. This device can select any channel within the free spectral range (FSR) of 1600 GHz using electro-optic effect. Error-free channel selections were demonstrated, and the power penalties were less than 0.5 dB. © 2012 SEE.


Nashimoto K.,EpiPhotonics Corporation | Kudzuma D.,EpiPhotonics Corporation | Han H.,EpiPhotonics Corporation
Optics InfoBase Conference Papers | Year: 2011

A strictly non-blocking PLZT 4x4 optical switch with less than 10 ns response is developed. The switch consisted of 24-1x2 switch elements which have polarization insensitivity and low-power consumption is integrated on a single chip. © OSA/OFC/NFOEC 2011.


Asakura H.,Keio University | Nashimoto K.,EpiPhotonics Corporation | Kudzuma D.,EpiPhotonics Corporation | Hashimoto M.,EpiPhotonics Corporation | Tsuda H.,Keio University
Electronics Letters | Year: 2012

A wavelength selective, (Pb, La)(Zr, Ti)O 3 (PLZT)-based, arrayed-waveguide grating (AWG) with eight output channels at a spacing of 200GHz is reported. The wavelength channel is selected by controlling the voltages applied to electrodes on the AWG. High-speed wavelength selection was successfully demonstrated with a response time of less than 40ns. The extinction ratio was larger than 13dB, and the 3dB optical bandwidth was 110GHz. The insertion loss was 19dB including a coupling loss of 10dB and a waveguide propagation loss of 3dB. © 2012 The Institution of Engineering and Technology.


Nashimoto K.,EpiPhotonics Corporation | Kudzuma D.,EpiPhotonics Corporation | Han H.,EpiPhotonics Corporation
2011 Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference, OFC/NFOEC 2011 | Year: 2011

A strictly non-blocking PLZT 4×4 optical switch with less than 10 ns response is developed. The switch consisted of 24-1×2 switch elements which have polarization insensitivity and low-power consumption is integrated on a single chip. © 2011 Optical Society of America.


Asakura H.,Keio University | Nashimoto K.,EpiPhotonics Corporation | Kudzuma D.,EpiPhotonics Corporation | Hashimoto M.,EpiPhotonics Corporation | Tsuda H.,Keio University
IEICE Electronics Express | Year: 2012

A wavelength selective AWG (arrayed-waveguide grating) was fabricated using buried PLZT ((Pb, La)(Zr, Ti)O 3) waveguides. It has 8 output channels with 200GHz spacing. The buried PLZT waveguides have lower propagation loss and higher optical confinement compared to the previously reported ridge PLZT waveguides. Therefore, using buried PLZT waveguides, an AWG with shorter channel spacing than a conventional AWG can be designed and fabricated. The 3-dB bandwidth was 110GHz, the maximum control voltage was 14V, and the tuning range was 1600GHz. Wavelength tuning was successfully demonstrated with a crosstalk of about -14dB for TE (transverse electric) polarized light and -13dB for TM (transverse magnetic) polarized light. © IEICE 2012.


Asakura H.,Keio University | Nashimoto K.,EpiPhotonics Corporation | Kudzuma D.,EpiPhotonics Corporation | Kawashima H.,Japan National Institute of Advanced Industrial Science and Technology | Tsuda H.,Keio University
Technical Digest of the 18th Microoptics Conference, MOC 2013 | Year: 2013

A hybrid integration of silica arrayed-waveguide gratings, couplers and a high-speed PLZT switch array is reported for the first time. A 1×2 wavelength selective switch is fabricated. The channel spacing is 200 GHz and the number of channels is 20. The switching time is less than 13 ns. © 2013 The Japan Society of Applied Physics.


Asakura H.,Keio University | Nashimoto K.,EpiPhotonics Corporation | Kudzuma D.,EpiPhotonics Corporation | Hashimoto M.,EpiPhotonics Corporation | Tsuda H.,Keio University
Pacific Rim Conference on Lasers and Electro-Optics, CLEO - Technical Digest | Year: 2013

A 100-GHz-spacing, 8-channel, PLZT arrayed-waveguide grating was fabricated. The crosstalk was effectively reduced from -7.1 dB to -14.8 dB by phase error compensation achieved by a fine adjustment of the applied voltages to the electrodes. © 2013 IEEE.


Nashimoto K.,EpiPhotonics Corporation | Kudzuma D.,EpiPhotonics Corporation | Han H.,EpiPhotonics Corporation
Technical Digest - 15th OptoElectronics and Communications Conference, OECC2010 | Year: 2010

Nano-second speed optical switches and filters fabricated in epitaxially grown (Pb,La)(Zr,La)O3 (PLZT) waveguides are reported. The optical switches including 1x2, 2x2, and 1x16 ports have switching time less than 10 ns and the AWG based 8x1 wavelength filter has 15 ns switching time. A PLZT buried waveguide is successfully developed to minimize insertion loss and polarization dependence in the optical switches.

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