The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
K. Okamoto - One of the best experts on this subject based on the ideXlab platform.
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Compact Spectroscopic Sensor Using an Arrayed Waveguide Grating
2007 IEEE LEOS International Conference on Optical MEMS and Nanophotonics, 2007Co-Authors: K. Kodate, Y. Komai, K. OkamotoAbstract:We have previously proposed a compact spectroscopic sensor based on the Arrayed Waveguide grating (AWG) which makes use of wavelength multi/demultiplexer in a photonic network. We constructed a new planar sensor using a visible AWG for spectroscopic sensing of absorption characteristics with multiple dicing grooves for accommodating a liquid sample. A parabola-shaped sample injection Waveguide effectively improves sensitivity because diffraction loss in the direction of its substrate is reduced. In this manuscript, discrimination between chlorophyll a and b as test samples is to be investigated using our AWG spectroscopic sensor.
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continuous 500 ghz pulse train generation by repetition rate multiplication using Arrayed Waveguide grating
Electronics Letters, 2003Co-Authors: D S Seo, S. Kamei, Daniel E Leaird, Andrew M Weiner, A Sugita, M Ishii, K. OkamotoAbstract:The use of a specially designed Arrayed Waveguide grating as a repetition-rate multiplier is demonstrated for the first time. A continuous 500 GHz pulse train is generated by multiplying the repetition rate of an 11.9 GHz short-pulse source at 1.5 /spl mu/m by a factor of 42.
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1 ghz spaced 16 channel Arrayed Waveguide grating for a wavelength reference standard in dwdm network systems
Journal of Lightwave Technology, 2002Co-Authors: Kazumasa Takada, T Shibata, M Abe, K. OkamotoAbstract:We fabricated a 1-GHz-spaced 16-channel Arrayed-Waveguide grating (AWG) by using a new AWG configuration where the path of each Arrayed Waveguide winds backward and forward across a 4-in diameter wafer without crossing any other Waveguides. The ultra-narrow (< 1 GHz) and stable transmission bands of this AWG can be used to construct a wavelength reference standard covering the S, C, and L bands in the dense wavelength-division-multiplexing network systems whose frequency deviation is /spl plusmn/160 MHz.
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low crosstalk 10 ghz spaced 512 channel Arrayed Waveguide grating multi demultiplexer fabricated on a 4 in wafer
IEEE Photonics Technology Letters, 2001Co-Authors: Kazumasa Takada, M Ishii, M Abe, M Shibata, K. OkamotoAbstract:We report a 10-GHz-spaced 512-channel Arrayed-Waveguide grating (AWG) multi/demultiplexer fabricated on a 4-in wafer. We achieved this by folding the 7-cm-long slab Waveguides of a conventionally configured AWG, so that the whole configuration was contained in the wafer and then attached reflecting mirrors at the folded parts. Phase compensation of the fabricated AWG was performed by means of ultraviolet irradiation through a metal mask.
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generation of high repetition rate wdm pulse trains from an Arrayed Waveguide grating
IEEE Photonics Technology Letters, 2001Co-Authors: Daniel E Leaird, S. Kamei, S Shen, Andrew M Weiner, A Sugita, M Ishii, K. OkamotoAbstract:We present what we believe to be the first demonstration of femtosecond pulse train generation from an Arrayed-Waveguide grating. Terahertz-rate bursts of femtosecond pulses are produced with the rate determined by the Arrayed-Waveguide delay spacing.
H Takahashi - One of the best experts on this subject based on the ideXlab platform.
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large port count wavelength routing optical switch consisting of cascaded small size cyclic Arrayed Waveguide gratings
IEEE Photonics Technology Letters, 2012Co-Authors: Tomonobu Niwa, Kenichi Sato, Hiroshi Hasegawa, T Watanabe, H TakahashiAbstract:We propose a highly scalable switch architecture suitable for client-side cross-connect switches in reconfigurable optical add/drop multiplexers and optical switching in data centers. It consists of cascaded cyclic Arrayed Waveguide gratings (AWGs). We develop a 270 × 270 prototype switch consisting of an assembly of Arrayed small switches and couplers and AWGs that are fabricated on planar lightwave circuit chips. Transmission experiments verify its technical feasibility.
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loss uniformity improvement of Arrayed Waveguide grating with mode field converters designed by wavefront matching method
Journal of Lightwave Technology, 2009Co-Authors: Y Sakamaki, S. Kamei, Tsutomu Kitoh, T Hashimoto, H TakahashiAbstract:We describe a silica-based Arrayed-Waveguide grating (AWG) with low channel-dependent loss variation achieved by using mode-field converters designed with the wavefront matching method. This mode-field converter converts the fundamental mode of the Arrayed Waveguide into the field distribution with a flat-top far field at the interface between the slab and output Waveguides. We applied our mode-field converters to an AWG with a 100-GHz channel spacing and reduced the loss deviations experimentally from 2.4 to 0.7 dB over one free spectral range. Moreover, we confirmed that the introduction of our mode-field converters had no adverse effects on the AWG demultiplexing characteristics. It is notable that the loss uniformity was improved solely by replacing the conventional tapered Waveguide between the Arrayed Waveguides and output slab Waveguide with our mode-field converter without sacrificing the fabrication manageability or AWG design flexibility.
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1 5 spl delta athermal Arrayed Waveguide grating multi demultiplexer with very low loss groove design
IEEE Photonics Technology Letters, 2005Co-Authors: S. Kamei, Yasuyuki Inoue, T Shibata, H Takahashi, A Kaneko, K Iemura, Akio SugitaAbstract:We describe a compact 1.5%-/spl Delta/ athermal silica-based 100-GHz-spacing 16-channel Arrayed-Waveguide grating (AWG) multi/demultiplexer with a modified groove design for a very low excess loss. We propose new approaches for modifying the shape of the grooves and the Arrayed Waveguides and optimize the shape modifications for 1.5%-/spl Delta/ Waveguides. By employing this modified groove design, we greatly reduced the groove excess loss from 1.9 to 0.4 dB in the 1.5%-/spl Delta/ athermal AWG.
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Athermal silica-based Arrayed-Waveguide grating (AWG) multiplexers with new low loss groove design
OFC IOOC . Technical Digest. Optical Fiber Communication Conference 1999 and the International Conference on Integrated Optics and Optical Fiber Commu, 1999Co-Authors: A Kaneko, S. Kamei, H Takahashi, Y Inoue, A SugitaAbstract:We propose a new low loss groove design for athermal silica-based Arrayed-Waveguide grating multiplexers. The insertion loss was 3 dB and the cross talk was -35 dB. The temperature dependence of the channel wavelength change was suppressed to below 0.4 nm in the 0-85/spl deg/C temperature range.
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athermal silica based Arrayed Waveguide grating multiplexer
Electronics Letters, 1997Co-Authors: Yasuyuki Inoue, A. Kaneko, H Takahashi, Fumiaki Hanawa, Kuninori Hattori, S SumidaAbstract:A temperature dependent channel wavelength shift in a silica-based Arrayed-Waveguide grating multiplexer is successfully suppressed from 0.95 to 0.05 nm in the 0-85/spl deg/C temperature range, which means that it can be used in practical WDM systems without the need for temperature control.
Y Inoue - One of the best experts on this subject based on the ideXlab platform.
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Second- and third-order dispersion compensator using a high-resolution Arrayed-Waveguide grating
IEEE Photonics Technology Letters, 1999Co-Authors: H Tsuda, K. Okamoto, Y Inoue, T. Ishii, K. Naganuma, H. Takenouchi, T KurokawaAbstract:We have proposed a dispersion compensation scheme that uses a high-resolution Arrayed-Waveguide grating (AWG). When the diffraction order of the AWG is 59 and the number of Waveguides in an Arrayed-Waveguide is 340, the calculated maximum second- and third-order dispersion compensation range is 18.0 ps/nm and /spl plusmn/6.0 ps/nm/sup 2/, and 1100 ps/nm and /spl plusmn/937.5 ps/nm/sup 2/, for a 1 ps-pulse and a 12.5 ps-pulse, respectively. In experiments, second-order dispersion (-0.8 to +5.2 ps/nm) is effectively compensated for 1,1-ps pulses; and. Pulse compression by third-order dispersion compensation is successfully demonstrated.
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Athermal silica-based Arrayed-Waveguide grating (AWG) multiplexers with new low loss groove design
OFC IOOC . Technical Digest. Optical Fiber Communication Conference 1999 and the International Conference on Integrated Optics and Optical Fiber Commu, 1999Co-Authors: A Kaneko, S. Kamei, H Takahashi, Y Inoue, A SugitaAbstract:We propose a new low loss groove design for athermal silica-based Arrayed-Waveguide grating multiplexers. The insertion loss was 3 dB and the cross talk was -35 dB. The temperature dependence of the channel wavelength change was suppressed to below 0.4 nm in the 0-85/spl deg/C temperature range.
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athermal silica based Arrayed Waveguide grating awg multiplexer
European Conference on Optical Communication, 1997Co-Authors: Y InoueAbstract:Temperature dependent channel wavelength shift in a silica-based Arrayed-Waveguide grating multiplexer is successfully suppressed from 0.95 nm to 0.05 nm in the 0-85/spl deg/C temperature range, which means it can be used in practical WDM systems without temperature control.
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Arrayed Waveguide grating multiplexer with loop back optical paths and its applications
Journal of Lightwave Technology, 1996Co-Authors: Y Tachikawa, Y Inoue, M Ishii, T NozawaAbstract:We present a basic configuration of an unique integrated-optic Arrayed-Waveguide grating (AWG) multiplexer with loop-back optical paths and demonstrate an add-drop multiplexer (ADM), a network access terminal, and a wavelength channel selector for dense-WDM ring or bus networks, as three useful examples of its attractive applications. A key device in these components is a silica-glass based 1.55 /spl mu/m polarization-insensitive 32/spl times/32 AWG multiplexer chip with 0.8 nm channel spacing which is fabricated using planar lightwave circuit (PLC) technologies. Fine operation in their new functional components is achieved by using the AWG multiplexer module having low insertion loss of 3.9 dB and low interchannel crosstalk of less than -28 dB.
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transmission characteristics of Arrayed Waveguide n spl times n wavelength multiplexer
Journal of Lightwave Technology, 1995Co-Authors: H Takahashi, K Oda, H Toba, Y InoueAbstract:To realize practical wavelength division multiplexing (WDM) systems, a high-performance N/spl times/N wavelength multiplexer is introduced that is based on an Arrayed-Waveguide grating. Its transmission characteristics are theoretically derived and experimentally confirmed. A prototype is constructed using the previously proposed techniques that attain low insertion loss and polarization independent operation. It has 16 channels (N=16) with a spacing of 0.8 mn, or 100 GHz, in the 1.55-/spl mu/m band. Frequency relation between input and output ports, free spectral range, and passband width are determined. A demonstration of IM-DD pulse transmission shows that there is no degradation of bit error rate resulting from the finite passband width and crosstalk of the multiplexer. It is confirmed that the multiplexer can realize highly reliable N-channel WDM and WDM-based N/spl times/N interconnect optical networks. >
S. Kamei - One of the best experts on this subject based on the ideXlab platform.
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loss uniformity improvement of Arrayed Waveguide grating with mode field converters designed by wavefront matching method
Journal of Lightwave Technology, 2009Co-Authors: Y Sakamaki, S. Kamei, Tsutomu Kitoh, T Hashimoto, H TakahashiAbstract:We describe a silica-based Arrayed-Waveguide grating (AWG) with low channel-dependent loss variation achieved by using mode-field converters designed with the wavefront matching method. This mode-field converter converts the fundamental mode of the Arrayed Waveguide into the field distribution with a flat-top far field at the interface between the slab and output Waveguides. We applied our mode-field converters to an AWG with a 100-GHz channel spacing and reduced the loss deviations experimentally from 2.4 to 0.7 dB over one free spectral range. Moreover, we confirmed that the introduction of our mode-field converters had no adverse effects on the AWG demultiplexing characteristics. It is notable that the loss uniformity was improved solely by replacing the conventional tapered Waveguide between the Arrayed Waveguides and output slab Waveguide with our mode-field converter without sacrificing the fabrication manageability or AWG design flexibility.
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low loss and compact silica based athermal Arrayed Waveguide grating using resin filled groove
Journal of Lightwave Technology, 2009Co-Authors: S. Kamei, Yasuyuki Inoue, T Shibata, A. KanekoAbstract:We describe our design and fabrication of a low-loss and compact 1.5%-Delta silica-based athermal Arrayed Waveguide grating (AWG) using a resin-filled groove. We present the theory of athermal AWG design and clarify the relationship between the AWG design parameters and the groove design required for realizing an athermal condition. We also describe approaches for reducing excess loss in the groove, which are used to optimize the groove and Arrayed Waveguide designs. We examine the performance of a 40-channel 100 GHz spacing athermal AWG module that employs all of the approaches. We successfully reduce the excess loss in the groove to 0.2 dB and achieve a compact chip size of 31times23 mm2 as well as sufficient optical performance and temperature insensitivity for practical use. In addition, we confirm by calculation that our approaches for excess loss reduction are also effective for an athermal AWG with a channel spacing of less than 100 GHz.
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wavelength path reconfigurable awg star employing coprime channel cycle Arrayed Waveguide gratings
IEEE Photonics Technology Letters, 2009Co-Authors: Osamu Moriwaki, S. Kamei, Kazuto Noguchi, Tadashi Sakamoto, Hiroshi TakahashiAbstract:We propose a novel reconfigurable AWG-STAR (physical star topology network with Arrayed-Waveguide grating router) that employs two kinds of cyclic-frequency Arrayed-Waveguide gratings whose repetition channel numbers are coprime. We demonstrate that all the wavelength paths can be assigned independently with excellent transmission characteristics.
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1 5 spl delta athermal Arrayed Waveguide grating multi demultiplexer with very low loss groove design
IEEE Photonics Technology Letters, 2005Co-Authors: S. Kamei, Yasuyuki Inoue, T Shibata, H Takahashi, A Kaneko, K Iemura, Akio SugitaAbstract:We describe a compact 1.5%-/spl Delta/ athermal silica-based 100-GHz-spacing 16-channel Arrayed-Waveguide grating (AWG) multi/demultiplexer with a modified groove design for a very low excess loss. We propose new approaches for modifying the shape of the grooves and the Arrayed Waveguides and optimize the shape modifications for 1.5%-/spl Delta/ Waveguides. By employing this modified groove design, we greatly reduced the groove excess loss from 1.9 to 0.4 dB in the 1.5%-/spl Delta/ athermal AWG.
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continuous 500 ghz pulse train generation by repetition rate multiplication using Arrayed Waveguide grating
Electronics Letters, 2003Co-Authors: D S Seo, S. Kamei, Daniel E Leaird, Andrew M Weiner, A Sugita, M Ishii, K. OkamotoAbstract:The use of a specially designed Arrayed Waveguide grating as a repetition-rate multiplier is demonstrated for the first time. A continuous 500 GHz pulse train is generated by multiplying the repetition rate of an 11.9 GHz short-pulse source at 1.5 /spl mu/m by a factor of 42.
Yasuyuki Inoue - One of the best experts on this subject based on the ideXlab platform.
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low loss and compact silica based athermal Arrayed Waveguide grating using resin filled groove
Journal of Lightwave Technology, 2009Co-Authors: S. Kamei, Yasuyuki Inoue, T Shibata, A. KanekoAbstract:We describe our design and fabrication of a low-loss and compact 1.5%-Delta silica-based athermal Arrayed Waveguide grating (AWG) using a resin-filled groove. We present the theory of athermal AWG design and clarify the relationship between the AWG design parameters and the groove design required for realizing an athermal condition. We also describe approaches for reducing excess loss in the groove, which are used to optimize the groove and Arrayed Waveguide designs. We examine the performance of a 40-channel 100 GHz spacing athermal AWG module that employs all of the approaches. We successfully reduce the excess loss in the groove to 0.2 dB and achieve a compact chip size of 31times23 mm2 as well as sufficient optical performance and temperature insensitivity for practical use. In addition, we confirm by calculation that our approaches for excess loss reduction are also effective for an athermal AWG with a channel spacing of less than 100 GHz.
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1 5 spl delta athermal Arrayed Waveguide grating multi demultiplexer with very low loss groove design
IEEE Photonics Technology Letters, 2005Co-Authors: S. Kamei, Yasuyuki Inoue, T Shibata, H Takahashi, A Kaneko, K Iemura, Akio SugitaAbstract:We describe a compact 1.5%-/spl Delta/ athermal silica-based 100-GHz-spacing 16-channel Arrayed-Waveguide grating (AWG) multi/demultiplexer with a modified groove design for a very low excess loss. We propose new approaches for modifying the shape of the grooves and the Arrayed Waveguides and optimize the shape modifications for 1.5%-/spl Delta/ Waveguides. By employing this modified groove design, we greatly reduced the groove excess loss from 1.9 to 0.4 dB in the 1.5%-/spl Delta/ athermal AWG.
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400 channel Arrayed Waveguide grating with 25 ghz spacing using 1 5 δ Waveguides on 6 inch si wafer
Electronics Letters, 2001Co-Authors: Yasuhiro Hida, Yoshinori Hibino, Tsutomu Kitoh, Yasuyuki Inoue, Mikitaka Itoh, T Shibata, Akio Sugita, Akira HimenoAbstract:A large-scale Arrayed-Waveguide grating with a 400-channel and 25 GHz spacing using 1.5%-/spl Delta/ silica-based Waveguides on a 6-inch Si wafer has been realised. Good demultiplexing properties have been obtained over the full Cand L-band range with an on-chip loss of 3.8 to 6.4 dB and a far-end crosstalk of -30 dB.
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athermal silica based Arrayed Waveguide grating multiplexer
Electronics Letters, 1997Co-Authors: Yasuyuki Inoue, A. Kaneko, H Takahashi, Fumiaki Hanawa, Kuninori Hattori, S SumidaAbstract:A temperature dependent channel wavelength shift in a silica-based Arrayed-Waveguide grating multiplexer is successfully suppressed from 0.95 to 0.05 nm in the 0-85/spl deg/C temperature range, which means that it can be used in practical WDM systems without the need for temperature control.
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time space conversion optical signal processing using Arrayed Waveguide grating
Electronics Letters, 1997Co-Authors: Takashi Kurokawa, Hirokazu Takenouchi, K. Okamoto, Hiroyuki Tsuda, Yasuyuki Inoue, Kazunori Naganuma, M IshiiAbstract:The authors propose time-space-conversion optical signal processing using an Arrayed-Waveguide grating. It provides a wide time window, compatibility with fibre optics, compactness, and integration capabilities. Pulse train generation is demonstrated to confirm its performance at the wavelength of 1.55 µm.