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Optical pulse compressor, optical function generator, optical pulse compression method, and optical function generation method

外国特許コード F110005732
整理番号 Y0368WO
掲載日 2011年9月12日
出願国 アメリカ合衆国
出願番号 55364904
公報番号 20070025728
公報番号 7428096
出願日 平成16年3月23日(2004.3.23)
公報発行日 平成19年2月1日(2007.2.1)
公報発行日 平成20年9月23日(2008.9.23)
国際出願番号 JP2004003937
国際公開番号 WO2004092810
国際出願日 平成16年3月23日(2004.3.23)
国際公開日 平成16年10月28日(2004.10.28)
優先権データ
  • 特願2003-109708 (2003.4.15) JP
  • 2004WO-JP03937 (2004.3.23) WO
発明の名称 (英語) Optical pulse compressor, optical function generator, optical pulse compression method, and optical function generation method
発明の概要(英語) (US7428096)
A small-sized, high-functionality optical pulse compressor capable of generating a low-power, high-repetition-frequency ultrashort pulse train used for ultrafast optical communication and photometry, and a simple-structure optical function generator for realizing an arbitrary time waveform.
The optical pulse compressor comprises and optical Fourier transform device (F) having an optical phase modulator ( 9 ) driven by the repetition-frequency of an input optical pulse train and a dispersive medium ( 8 ), for converting the shape of an input optical pulse frequency spectrum into its time waveform, and an optical filter ( 3 ) inserted ahead of the optical Fourier transform device (F), for reducing the spectrum width of an input optical pulse, wherein the optical Fourier transform device (F) converts a small-spectrum-width optical pulse output from the optical function generator generates an optical pulse.
The optical function generator generates an optical pulse having an arbitrary time waveform by reproducing, as it is, a spectrum waveform-shaped arbitrarily by an optical filter on a time-axis by the optical Fourier transform device (F).
特許請求の範囲(英語) [claim1]
1. An optical function generator comprising: an optical pulse generator for generating an optical pulse train;
an optical Fourier transform circuit for converting the shape of the frequency spectrum of the optical pulse input from the optical pulse generator to a time waveform, the optical Fourier transform circuit having an optical phase modulator driven at the repetition frequency of the input optical pulse train from the optical pulse generator and a dispersive medium;
and
an optical filter for shaping the spectrum of the input optical pulse and determining the time waveform of the output optical pulse in accordance with frequency characteristics, the optical filter being inserted before the optical Fourier transform circuit,wherein the optical Fourier transform circuit generates an optical pulse having a desired time waveform depending on the function form of the frequency characteristics of the optical filter, by reproducing, directly in the time domain, the spectrum shaped as desired by the optical filter.
[claim2]
2. An optical function generator according the claim 1, wherein a Fourier-transform-limited pulse is used as the input optical pulse.
[claim3]
3. An optical function generator according to claim 1, wherein the optical phase modulator is driven at a clock frequency reproduced from the input optical pulse train, and linearly chirps the input optical pulse;
and the dispersive medium gives group-velocity dispersion.
[claim4]
4. An optical function generator according to claim 1, wherein, in the optical Fourier transform circuit,the dispersive medium gives group-velocity dispersion to the optical pulse output from the optical filter;
the optical phase modulator is driven at a clock frequency reproduced from the input optical pulse train, and linearly chirps the optical pulse output from the dispersive medium;
and
the dispersive medium receives the optical pulse output from the optical phase modulator, gives group-velocity dispersion again, and compensates for the remaining chirp.
[claim5]
5. An optical function generator according to claim 1, wherein, in the optical Fourier transform circuit,the optical phase modulator is driven at a clock frequency reproduced from the input optical pulse train, and linearly chirps the optical pulse output from the optical filter;the dispersive medium gives group-velocity dispersion to the optical pulse output from the optical phase modulator;
and
the optical phase modulator receives the optical pulse output from the dispersive medium, gives another linear chirp, and compensates for the remaining chirp.
[claim6]
6. An optical function generator according to claim 1, wherein the chirp rate K of phase modulation by the phase modulator and the group-velocity dispersion D of the dispersive medium satisfy a relationship of K=1/D.
[claim7]
7. An optical function generation method using an optical function generator comprising an optical pulse generator, an optical Fourier transform circuit, and an optical filter, the optical Fourier transform circuit having an optical phase modulator and a dispersive medium, the optical function generation method including: shaping the spectrum of an input optical pulse from the optical pulse generator, and determining the time waveform of the output optical pulse in accordance with frequency characteristics, by inserting the optical filter before the optical Fourier transform circuit;driving the optical phase modulator at the repetition frequency of the input optical pulse train;
and
generating an optical pulse having a desired time waveform, depending on the function form of the frequency characteristics of the optical filter, by reproducing, directly in the time domain, the spectrum shaped as desired by the optical filter, by means of the optical Fourier transform circuit.
  • 発明者/出願人(英語)
  • NAKAZAWA MASATAKA
  • HIROOKA TOSHIHIKO
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
国際特許分類(IPC)
米国特許分類/主・副
  • G02F001/055C
  • H01S003/00F1
  • H04B010/508
  • S02F203/26
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