Akio Sugita - IEEE Xplore Author Profile
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Akio Sugita

Also published under: A. Sugita

Publications
43
Citations
917
Publications by Year
19892006
Co-Authors:
Show All Co-Authors (86)
Image of author Akio Sugita

Akio Sugita

Also published under: A. Sugita

Affiliation

NTT Photonics Laboratory, Kanagawa, Japan

Publication Topics

Biography

Akio Sugita was born in Tokyo, Japan, on August 8, 1956. He received the B.E., M.S. and Ph.D. degrees in material engineering from Tokyo Institute of Technology, in 1980, 1982, and 1993, respectively.,In 1982, he joined the Ibaraki Electrical Communication Laboratory, Nippon Telegraph and Telephone Corporation (NTT), Ibaraki, Japan, and was engaged in research on electron-beam lithography. He subsequently investigated silica-based planar lightwave circuit technologies and their applications to functional photonic components. From 1994 to 1997 and from 2000 to 2004, he worked with the NTT subsidiary company (NEL), where he developed optical component devices such as arrayed-waveguide-grating (AWG) filters and optical switches. He is currentl...
Publications
43
Citations
917
Publications by Year
19892006
Co-Authors:
Show All Co-Authors (86)
Author's Published Works

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PLC-Based Pulse-Train Generators

Daniel E. Leaird;Akio Sugita;Takashi Saida;Katsunari Okamoto;Andrew M. Weiner

Journal of Lightwave Technology
Year: 2006 | Volume: 24, Issue: 11 | Journal Article |
Novel planar-lightwave-circuit-based pulse-train-generator devices designed for use as repetition-rate multipliers are experimentally investigated. In addition to arrayed waveguide grating-based pulse-train generators and loss-engineered devices which have been previously demonstrated, novel excitation-engineered structures are described which illuminate design constraints that impact the practica...Show More

PLC-Based Pulse-Train Generators

Daniel E. Leaird;Akio Sugita;Takashi Saida;Katsunari Okamoto;Andrew M. Weiner

Year: 2006 | Volume: 24, Issue: 11 | Journal Article |

1.5%-/spl Delta/ athermal arrayed-waveguide grating multi/demultiplexer with very low loss groove design

S. Kamei;K. Iemura;A. Kaneko;Y. Inoue;T. Shibata;H. Takahashi;A. Sugita

IEEE Photonics Technology Letters
Year: 2005 | Volume: 17, Issue: 3 | Journal Article |
Cited by: Papers (32)
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...Show More

1.5%-/spl Delta/ athermal arrayed-waveguide grating multi/demultiplexer with very low loss groove design

S. Kamei;K. Iemura;A. Kaneko;Y. Inoue;T. Shibata;H. Takahashi;A. Sugita

Year: 2005 | Volume: 17, Issue: 3 | Journal Article |

Generation of a 500 GHz optical pulse train by repetition-rate multiplication using an arrayed waveguide grating

D.S. Seo;D.E. Leaird;A.M. Weiner;S. Kamei;M. Ishii;A. Sugita;K. Okamoto

The 16th Annual Meeting of the IEEE Lasers and Electro-Optics Society, 2003. LEOS 2003.
Year: 2003 | Conference Paper |
Cited by: Papers (1)
In recent work the authors have demonstrated for the first time that upon femtosecond read-out, AWGs can also provide interesting time-domain functionalities, such as generation of isolated bursts of very high repetition-rate pulses. Here, for the first time we report the use of an AWG as a repetition-rate multiplier, producing a 500 GHz continuous pulse train output from a 13.2 GHz repetition-rat...Show More

Generation of a 500 GHz optical pulse train by repetition-rate multiplication using an arrayed waveguide grating

D.S. Seo;D.E. Leaird;A.M. Weiner;S. Kamei;M. Ishii;A. Sugita;K. Okamoto

Year: 2003 | Volume: 2 | Conference Paper |

Temporal response of an excitation engineered 1/spl times/16 splitter

D.E. Leaird;A.M. Weiner;T. Saida;A. Sugita;K. Okamoto

The 16th Annual Meeting of the IEEE Lasers and Electro-Optics Society, 2003. LEOS 2003.
Year: 2003 | Conference Paper |
The temporal response of a funnel-type 1/spl times/16 splitter is investigated. Improper input alignment is shown to generate temporal satellite pulses which could negatively impact excitation-engineered splitters for future very-high repetition rate pulse train generators.Show More

Temporal response of an excitation engineered 1/spl times/16 splitter

D.E. Leaird;A.M. Weiner;T. Saida;A. Sugita;K. Okamoto

Year: 2003 | Volume: 2 | Conference Paper |

Silica-based waveguide-type 16 x 16 optical switch module incorporating driving circuits

T. Shibata;M. Okuno;T. Goh;T. Watanabe;M. Yasu;M. Itoh;M. Ishii;Y. Hibino;A. Sugita;A. Himeno

IEEE Photonics Technology Letters
Year: 2003 | Volume: 15, Issue: 9 | Journal Article |
We developed a 16/spl times/16 optical matrix switch module in which we incorporated a silica-based thermooptic switch chip and driving circuits. The module exhibited excellent levels of performance, namely a low insertion loss and a high extinction ratio. This is the largest scale waveguide-type matrix switch module yet reported. Driving circuits with a serial-to-parallel control signal conversio...Show More

Silica-based waveguide-type 16 x 16 optical switch module incorporating driving circuits

T. Shibata;M. Okuno;T. Goh;T. Watanabe;M. Yasu;M. Itoh;M. Ishii;Y. Hibino;A. Sugita;A. Himeno

Year: 2003 | Volume: 15, Issue: 9 | Journal Article |

Generation of high repetition rate pulse bursts via femtosecond readout of a double-passed arrayed waveguide grating

D.E. Leaird;A.M. Weiner;S. Kamei;M. Ishii;A. Sugita;K. Okamoto

Optical Fiber Communication Conference and Exhibit
Year: 2002 | Conference Paper |
Cited by: Papers (1) | Patents (1)
In summary, we have shown that very-high repetition rate pulse bursts can be generated with an increased number of pulses by double-passing a small-FSR AWG. Equivalently, two identical AWG's could be interconnected back-to-back to generate the same functionality in transmission. The output temporal profile is determined by the autoconvolution of the temporal profile of an output channel in single-...Show More

Generation of high repetition rate pulse bursts via femtosecond readout of a double-passed arrayed waveguide grating

D.E. Leaird;A.M. Weiner;S. Kamei;M. Ishii;A. Sugita;K. Okamoto

Year: 2002 | Conference Paper |

Femtosecond pulse sequence processing using a double-passed arrayed waveguide grating

D.E. Leaird;A.M. Weiner;S. Kamei;M. Ishii;A. Sugita;K. Okamoto

Summaries of Papers Presented at the Lasers and Electro-Optics. CLEO '02. Technical Diges
Year: 2002 | Conference Paper |
Cited by: Patents (3)
Summary from only given. We have demonstrated the ability to generate complex optical waveforms over an 200 ps temporal window by double-passing an arrayed waveguide grating (AWG) with a femtosecond input pulse. Equivalently, two identical AWG's could be interconnected back-to-back to generate the same functionality in transmission. These investigations provide important insight into the operation...Show More

Femtosecond pulse sequence processing using a double-passed arrayed waveguide grating

D.E. Leaird;A.M. Weiner;S. Kamei;M. Ishii;A. Sugita;K. Okamoto

Year: 2002 | Conference Paper |

Double-passed arrayed waveguide grating for 500-GHz pulse burst generation

D.E. Leaird;A.M. Weiner;S. Kamei;M. Ishii;A. Sugita;K. Okamoto

IEEE Photonics Technology Letters
Year: 2002 | Volume: 14, Issue: 10 | Journal Article |
Cited by: Papers (3) | Patents (2)
500-GHz repetition rate pulse bursts on multiple wavelength shifted channels are generated via femtosecond readout of an arrayed waveguide grating (AWG). These bursts are combined onto a single channel by double-passing the AWG, resulting in a substantially increased number of output pulses.Show More

Double-passed arrayed waveguide grating for 500-GHz pulse burst generation

D.E. Leaird;A.M. Weiner;S. Kamei;M. Ishii;A. Sugita;K. Okamoto

Year: 2002 | Volume: 14, Issue: 10 | Journal Article |

Generation of flat-topped 500-GHz pulse bursts using loss engineered arrayed waveguide gratings

D.E. Leaird;A.M. Weiner;S. Kamei;M. Ishii;A. Sugita;K. Okamoto

IEEE Photonics Technology Letters
Year: 2002 | Volume: 14, Issue: 6 | Journal Article |
A specially engineered arrayed waveguide grating is demonstrated. The 500-GHz repetition rate bursts of femtosecond pulses with a flat-topped temporal intensity profile window are shown here for what we believe is the first time.Show More

Generation of flat-topped 500-GHz pulse bursts using loss engineered arrayed waveguide gratings

D.E. Leaird;A.M. Weiner;S. Kamei;M. Ishii;A. Sugita;K. Okamoto

Year: 2002 | Volume: 14, Issue: 6 | Journal Article |

New structure of silica-based planar lightwave circuits for low-power thermooptic switch and its application to 8 /spl times/ 8 optical matrix switch

R. Kasahara;M. Yanagisawa;T. Goh;A. Sugita;A. Himeno;M. Yasu;S. Matsui

Journal of Lightwave Technology
Year: 2002 | Volume: 20, Issue: 6 | Journal Article |
We propose a novel structure that reduces the switching power of a silica-based thermooptic switch (TOSW). The structure consists of silicon trenches and heat insulating grooves, which are formed beneath and beside the arms of a Mach-Zehnder interferometer, respectively. We optimize the structure using the differential-element method (DEM) and fabricate a 2 /spl times/ 2 TOSW with a switching powe...Show More

New structure of silica-based planar lightwave circuits for low-power thermooptic switch and its application to 8 /spl times/ 8 optical matrix switch

R. Kasahara;M. Yanagisawa;T. Goh;A. Sugita;A. Himeno;M. Yasu;S. Matsui

Year: 2002 | Volume: 20, Issue: 6 | Journal Article |

Novel birefringence compensating AWG design

Y. Inoue;M. Itoh;Y. Hashizume;Y. Hibino;A. Sugita;A. Himeno

OFC 2001. Optical Fiber Communication Conference and Exhibit. Technical Digest Postconference Edition (IEEE Cat. 01CH37171)
Year: 2001 | Conference Paper |
We propose a novel birefringence compensating arrayed waveguide grating (AWG) design that utilizes birefringence dependence on core width. We successfully demonstrated a polarization insensitive 100 GHz-spaced 16-channel multiplexer with a polarization dependent wavelength shift of 0.01 nm.Show More

Novel birefringence compensating AWG design

Y. Inoue;M. Itoh;Y. Hashizume;Y. Hibino;A. Sugita;A. Himeno

Year: 2001 | Volume: 3 | Conference Paper |

32 wavelength tunable mode-locked laser with 100 GHz channel spacing using an arrayed waveguide grating

K.R. Tamura;Y. Inoue;K. Sato;T. Komukai;A. Sugita;M. Nakazawa

OFC 2001. Optical Fiber Communication Conference and Exhibit. Technical Digest Postconference Edition (IEEE Cat. 01CH37171)
Year: 2001 | Conference Paper |
Cited by: Patents (1)
We demonstrate a discretely tunable mode-locked laser (time-to-wavelength mapped laser) consisting of a 32 wavelength silica-on-silicon planar lightwave circuit arrayed waveguide grating and an integrated electro-absorption modulator/semiconductor optical amplifier. The AWG is used to form a wavelength-dependent delay circuit to allow the oscillation wavelength to be selected by varying the modelo...Show More

32 wavelength tunable mode-locked laser with 100 GHz channel spacing using an arrayed waveguide grating

K.R. Tamura;Y. Inoue;K. Sato;T. Komukai;A. Sugita;M. Nakazawa

Year: 2001 | Volume: 2 | Conference Paper |

A discretely tunable mode-locked laser with 32 wavelengths and 100-GHz channel spacing using an arrayed waveguide grating

K.R. Tamura;Y. Inoue;K. Sato;T. Komukai;A. Sugita;M. Nakazawa

IEEE Photonics Technology Letters
Year: 2001 | Volume: 13, Issue: 11 | Journal Article |
Cited by: Papers (3)
We demonstrate a tunable mode-locked laser (time-to-wavelength mapped laser) with a 100-GHz channel spacing (1535.5-1560.5 nm) that uses a 32-wavelength silica-on-silicon planar lightwave circuit arrayed waveguide grating (AWG) for realizing a wavelength-dependent delay. The wavelength is selected by changing the mode-locking frequency. Mode-locking was realized by modulating the electroabsorption...Show More

A discretely tunable mode-locked laser with 32 wavelengths and 100-GHz channel spacing using an arrayed waveguide grating

K.R. Tamura;Y. Inoue;K. Sato;T. Komukai;A. Sugita;M. Nakazawa

Year: 2001 | Volume: 13, Issue: 11 | Journal Article |

Generation of high-repetition-rate WDM pulse trains from an arrayed-waveguide grating

D.E. Leaird;S. Shen;A.M. Weiner;A. Sugita;S. Kamei;M. Ishii;K. Okamoto

IEEE Photonics Technology Letters
Year: 2001 | Volume: 13, Issue: 3 | Journal Article |
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.Show More

Generation of high-repetition-rate WDM pulse trains from an arrayed-waveguide grating

D.E. Leaird;S. Shen;A.M. Weiner;A. Sugita;S. Kamei;M. Ishii;K. Okamoto

Year: 2001 | Volume: 13, Issue: 3 | Journal Article |

High repetition rate flat-topped pulse trains from an arrayed wavegulde grating

D.E. Leaird;A.M. Weiner;S. Shen;A. Sugita;S. Kamei;H. Yamada;M. Ishii;K. Okamoto

Technical Digest. Summaries of papers presented at the Conference on Lasers and Electro-Optics. Postconference Technical Digest (IEEE Cat. No.01CH37170)
Year: 2001 | Conference Paper |
Cited by: Patents (2)
Summary form only given. High repetition rate pulse bursts have been demonstrated from a specially designed AWG and a single short pulse source laser. The key requirement is that the free spectral range (FSR) of the device must be tailored so that multiple filter passbands fit within the input laser bandwidth. The unique properties of this device allow generation of identical, wavelength shifted, ...Show More

High repetition rate flat-topped pulse trains from an arrayed wavegulde grating

D.E. Leaird;A.M. Weiner;S. Shen;A. Sugita;S. Kamei;H. Yamada;M. Ishii;K. Okamoto

Year: 2001 | Conference Paper |

Silica-based PLC 1/spl times/128 thermo-optic switch

T. Watanabe;T. Goh;M. Okuno;S. Sohma;T. Shibata;M. Itoh;M. Kobayashi;M. Ishii;A. Sugita;Y. Hibino

Proceedings 27th European Conference on Optical Communication (Cat. No.01TH8551)
Year: 2001 | Conference Paper |
We successfully fabricated a silica-based 1/spl times/128 thermo-optic switch (TOSW) with an insertion loss of 4 dB and an extinction ratio of 40 dB using planar lightwave circuit (PLC) technology. This TOSW is promising for realizing a large-scale optical switch system.Show More

Silica-based PLC 1/spl times/128 thermo-optic switch

T. Watanabe;T. Goh;M. Okuno;S. Sohma;T. Shibata;M. Itoh;M. Kobayashi;M. Ishii;A. Sugita;Y. Hibino

Year: 2001 | Volume: 2 | Conference Paper |

Low-loss 1.5% /spl Delta/ arrayed waveguide grating with spot-size converters

M. Itoh;T. Saida;Y. Hida;M. Ishii;Y. Inoue;Y. Hibino;A. Sugita

Proceedings 27th European Conference on Optical Communication (Cat. No.01TH8551)
Year: 2001 | Conference Paper |
Cited by: Papers (4)
We achieved a very low insertion loss of 0.7 dB in a 1.5% /spl Delta/ arrayed-waveguide grating by successfully fabricating spot-size converters that reduced single-mode fiber coupling loss from 1.6 to 0.2 dB/point.Show More

Low-loss 1.5% /spl Delta/ arrayed waveguide grating with spot-size converters

M. Itoh;T. Saida;Y. Hida;M. Ishii;Y. Inoue;Y. Hibino;A. Sugita

Year: 2001 | Volume: 1 | Conference Paper |

Loss engineered arrayed waveguide gratings for generating multiple wavelength shifted 500 GHz repetition rate flat-topped pulse trains

D.E. Leaird;A.M. Weiner;A. Sugita;S. Kamei;H. Yamada;M. Ishii;K. Okamoto

LEOS 2001. 14th Annual Meeting of the IEEE Lasers and Electro-Optics Society (Cat. No.01CH37242)
Year: 2001 | Conference Paper |
Cited by: Papers (1) | Patents (1)
Flat-topped intensity profile, high repetition rate pulse bursts have been demonstrated from a specially designed AWG and a single short pulse source laser. The key requirement is that the free spectral range of the device must be tailored so that multiple filter passbands fit within the input laser bandwidth. The unique properties of this device allow generation of identical, wavelength shifted, ...Show More

Loss engineered arrayed waveguide gratings for generating multiple wavelength shifted 500 GHz repetition rate flat-topped pulse trains

D.E. Leaird;A.M. Weiner;A. Sugita;S. Kamei;H. Yamada;M. Ishii;K. Okamoto

Year: 2001 | Volume: 2 | Conference Paper |

A compact optical wavelength selector composed of arrayed-waveguide gratings and an optical gate array integrated on a single PLC platform

R. Kasahara;M. Yanahisawa;A. Sugita;I. Ogawa;T. Hashimoto;Y. Suzaki;K. Magari

IEEE Photonics Technology Letters
Year: 2000 | Volume: 12, Issue: 1 | Journal Article |
We developed a compact 16-ch optical wavelength selector (OWS). Our OWS is composed of two arrayed-waveguide gratings (AWG's) and an optical gate array (OGA) integrated on a single PLC platform by using the hybrid integration technique. We successfully obtained lossless operation with an extinction ratio of better than -45 dB for all wavelength channels. We also obtained a switching time of less t...Show More

A compact optical wavelength selector composed of arrayed-waveguide gratings and an optical gate array integrated on a single PLC platform

R. Kasahara;M. Yanahisawa;A. Sugita;I. Ogawa;T. Hashimoto;Y. Suzaki;K. Magari

Year: 2000 | Volume: 12, Issue: 1 | Journal Article |

1 THz repetition rate WDM pulse train generation from an arrayed-waveguide grating

D.E. Leaird;S. Shen;A.M. Weiner;A. Sugita;S. Kamei;M. Ishii;K. Olamoto

Conference on Lasers and Electro-Optics (CLEO 2000). Technical Digest. Postconference Edition. TOPS Vol.39 (IEEE Cat. No.00CH37088)
Year: 2000 | Conference Paper |
Cited by: Papers (1) | Patents (2)
The Arrayed-Waveguide Grating (AWG) has seen considerable development in the past few years [1]. There are now numerous commercial vendors of telecommunication grade devices for use as Wavelength Division Multiplexed (WDM) channel demultiplexors.
First Page of the Article
Show More

1 THz repetition rate WDM pulse train generation from an arrayed-waveguide grating

D.E. Leaird;S. Shen;A.M. Weiner;A. Sugita;S. Kamei;M. Ishii;K. Olamoto

Year: 2000 | Conference Paper |

Molecular photon echoes as a signature of vibrational cat states

H.F. Hofmann;T. Fuji;A. Sugita;T. Kobayashi

Nonlinear Optics: Materials, Fundamentals, and Applications. Technical Digest. Postconference Edition. TOPS Vol.46 (IEEE Cat. No.00CH37174)
Year: 2000 | Conference Paper |
Quantum interference between two distinct vibrational trajectories induced by two pulse femtosecond excitation in molecules is shown to result in a photon echo, providing direct evidence of the cat state superposition of Gaussian vibrational wavepackets.Show More

Molecular photon echoes as a signature of vibrational cat states

H.F. Hofmann;T. Fuji;A. Sugita;T. Kobayashi

Year: 2000 | Conference Paper |

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