光ファイバの非線形性を利用した光パルスのハンドリング技術に関する研究

• Project/Area Number: 16656118
• Research Category: Grant-in-Aid for Exploratory Research
• Allocation Type: Single-year Grants
• Research Field: Communication/Network engineering
• Research Institution: Osaka University
• Principal Investigator: 丸田 章博 大阪大学, 大学院・工学研究科, 助教授 (40252613)
• Project Period (FY): 2004 – 2006
• Project Status: Completed (Fiscal Year 2006)
• Budget Amount: ¥3,400,000 (Direct Cost: ¥3,400,000); Fiscal Year 2006: ¥1,000,000 (Direct Cost: ¥1,000,000); Fiscal Year 2005: ¥1,000,000 (Direct Cost: ¥1,000,000); Fiscal Year 2004: ¥1,400,000 (Direct Cost: ¥1,400,000)
• Keywords: 非線形光学 / 光ファイバ / 光信号処理 / 光ソリトン / 光アナログ-ディジタル変換 / 光ディジタル-アナログ変換 / 可変光遅延線 / スーパーコンティニューム光 / 非線形光ループミラー / パラメトリック増幅 / 変調フォーマット変換

Research Abstract

1.電界吸収型光変調器を用いた光アナログ-ディジタル変換技術の研究
パルス数のハンドリング技術は光アナログ-ディジタル(A/D)変換の基盤技術として重要である。本年は、電界吸収型光変調器(EAM)を用いた光A/D変換法の提案とその原理確認実験を行った。
まず、印加したアナログ電気信号の電圧振幅に依存してEAMのスペクトル吸収端が変化する現象を用い、スーパーコンティニューム(SC)光発生によって広がったスペクトルをEAMでフィルタリングする。このことにより、アナログ信号の振幅がスペクトル広がりの幅に変換される。次に、広がったスペクトルをアレイ導波路形回折格子(AWG)を用いてスライスし、アナログ信号の振幅に依存した数のパルスを得る。このような動作原理に基づき、2ビット光量子化の原理確認実験を行った。実験結果より、光ファイバの非線形性を用いたSC光発生現象と印加電圧の振幅によってEAMの吸収端が変化する現象を利用することにより、出力パルス数の操作が実現できることを確認し、提案方法の妥当性を示した。
2.ソリトン自己周波数シフトとスーパーコンティニューム光のスペクトルスライスを用いた光可変遅延線の研究
「光バッファ」の実現には、信号光パルスの遅延時間を制御する「光可変遅延線」を実現する必要がある。また、全光A/DおよびD/A変換器の入出力ポートにおけるタイミング調整にも「光可変遅延線」が必要である。本年は、光ファイバ中を伝搬するソリトンの自己周波数シフト(SSFS)とSC光のスペクトルスライスを用いた光可変遅延線を提案し、原理確認実験を行った。ソリトンを用いることにより、原理的に波形歪みの小さい遅延線を実現することができる。実験結果より、光ファイバの非線形性を利用したSSFSとSC光発生現象を用いることにより出力パルスの時間遅延量の操作が実現できることを確認し、提案方法の妥当性を示した。

Research Products

• [Journal Article] Optical Signal Processing Based on All-Optical Analog-to-Digital Conversion (invited) (2007)
  • Author(s): A.Maruta, S.Oda
  • Journal Title: The Optical Fiber Communication Conference ＆ Exposition (OFC/NFOEC 2007), Anaheim Convention Center, CA, USA
• [Journal Article] All-optical tunable delay line based on soliton self-frequency shift and filtering broadened spectrum due to self-phase modulation (2006)
  • Author(s): S.Oda, A.Maruta
  • Journal Title: Optics Express 14・17 Pages: 7895-7902
• [Journal Article] Photonic analogue-to-digital conversion using electroabsorption modulator and supercontinuum light (2006)
  • Author(s): S.Oda, A.Maruta
  • Journal Title: Electronics Letters 42・17 Pages: 1000-1001
• [Journal Article] All-Optical Analog-to-Dig tal and Digital-to-Analog Conversions Based on Fiber Nonlinearities (2006)
  • Author(s): A.Maruta, S.Oda
  • Journal Title: International Journal of Microwave and Optical Technology 1・2 Pages: 553-558
• [Journal Article] Experimental demonstration of all-optical tunable delay line based on distortion-less slow and fast light using soliton collision in optical fiber (2006)
  • Author(s): T.Kunihiro, A.Maeda, S.Oda, A.Maruta
  • Journal Title: Optics Express 14・24 Pages: 11736-11747
• [Journal Article] Experimental demonstration of distortion-less slow and fast light generation by use of soliton collision in optical fiber (2006)
  • Author(s): A.Maruta, T.Kunihiro, A.Maeda
  • Journal Title: The 8^<th> International Conference on Transparent Optical Networks (ICTON2006), Nottingham, UK
• [Journal Article] All-Optical Tunable Delay Line Based on Soliton Self-Frequency Shift and Filtering Supercontinuum Spectrum (2006)
  • Author(s): S.Oda, A.Maruta
  • Journal Title: OSA Topical Meeting on Slow and Fast Light 2006, Washington, DC, USA
  • NAID: 110004850859
• [Journal Article] Experimental Demonstration of All-Optical Tunable Delay Line Based on Soliton Self-Frequency Shift and Filtering Supercontinuum Spectrum (2006)
  • Author(s): S.Oda, A.Maruta
  • Journal Title: 32nd European Conference on Optical Communications (ECOC2006), Cannes, France
• [Journal Article] Photonic Analog-to-Digital Conversion Using Electro-Absorption Modulator and Supercontinuum Light (2006)
  • Author(s): S.Oda, A.Maruta
  • Journal Title: 32nd European Conference on Optical Communications (ECOC2006), Cannes, France
• [Journal Article] Experimental Demonstration of All-Optical Tunable Delay Line Based on Slow Light Using Soliton Collision in Optical Fiber (2006)
  • Author(s): T.Kunihiro, S.Oda, A.Maruta
  • Journal Title: 32nd European Conference on Optical Communications (ECOC2006), Cannes, France
• [Journal Article] All-optical signal processing by the use of nonlinear devices (2006)
  • Author(s): Akihiro Maruta
  • Journal Title: The First Research Forum of Japan-Indo Collaboration Project on Infrastructural Communication Technologies Supporting Fully Ubiquitous Information Society, Tokyo, Japan Pages: 106-112
• [Journal Article] All-Optical Digital-to-Analog Conversion Using Nonlinear Optical Loop Mirrors (2006)
  • Author(s): S.Oda, A.Maruta
  • Journal Title: IEEE Photonics Technology Letters 18(Accepted for publication)
• [Journal Article] 2-bit all-optical analog-to-digital conversion by filtering broadened and split spectrum induced by soliton effect or self0phase modulation in fiber (2006)
  • Author(s): S.Oda, A.Maruta
  • Journal Title: IEEE Journal of Selected Topics in Quantum Electronics 12(Accepted for publication)
• [Journal Article] Experimental Demonstration of 3-bit Photonic Analog-to-Digital Converter by Slicing SC Spectrum with AWG (2006)
  • Author(s): S.Oda, A.Maeda, A.Maruta
  • Journal Title: 2006 Asia-Pacific Microwave Photonics Conference (AP-MWP2006), Kobe, Japan
• [Journal Article] 2-bit All-Optical Analog-to-Digital Conversion by Slicing Supercontinuum Spectrum and Switching with Nonlinear Optical Loop Mirror and Its Application to Quaternary ASK-to-OOK Modulation Format Converter (2005)
  • Author(s): S.Oda, A.Maruta
  • Journal Title: IEICE Transaction on communications E88-B・5 Pages: 1963-1969
  • NAID: 110003222869
• [Journal Article] All-Optical Analog-to-Digital and Digital-to-Analog Conversions based on Fiber Nonlinearities (2005)
  • Author(s): A.Maruta, S.Oda
  • Journal Title: The 10th International Symposium on Microwave and Optical technology (ISMOT2005), Fukuoka, Japan
• [Journal Article] All-Optical Analog-to-Digital Conversion based on 2^<nd>-Order Soliton Splitting in Fiber (2005)
  • Author(s): S.Oda, A.Maruta
  • Journal Title: Topical Meeting on Nonlinear Guided Waves and Their Applications 2005 (NLGW2005), Dresden, Germany
• [Journal Article] Distortion-less all-optical tunable delay line based on soliton's temporal shift due to cross phase modulation in optical fiber (2005)
  • Author(s): A.Maruta
  • Journal Title: The 4^<th> International Conference on Optical Communications and Networks (ICOCN2005), Bangkok, Thailand Pages: 131-134
• [Journal Article] A Novel Quantization Scheme by Slicing Supercontinuum Spectrum for All-Optical Analog-to-Digital Conversion (2005)
  • Author(s): S.Oda, A.Maruta
  • Journal Title: IEEE Photonics Technology Letters 17・2 Pages: 465-467
• [Journal Article] 2-bit All-Optical Analog-to-Digital Conversion by Slicing Supercontinuum Spectrum and Switching with Nonlinear Optical Loop Mirror and Its Application to Quaternary ASK-to-OOK Modulation Format Converter (2005)
  • Author(s): S.Oda, A.Maruta
  • Journal Title: IEICE Transactions on Communications E88-B・5(Accepted for publication)
  • NAID: 110003222869
• [Journal Article] All-Optical Digital-to-Analog Conversion Utilizing Optical Parametric Amplification in Fiber and Its Application to OOK-to-M-ary ASK Modulation Format Converter (2005)
  • Author(s): S.Oda, A.Maruta
  • Journal Title: Eighth International Symposium on Contemporary Photonics Technology (CPT 2005) Izumi Garden Gallery Tokyo Japan
• [Journal Article] All-Optical Analog-to-Digital Conversion by Slicing Supercontinuum Spectrum and Switching with Nonlinear Optical Loop Mirror (2005)
  • Author(s): S.Oda, A.Maruta
  • Journal Title: The Optical Fiber Communication Conference & Exposition (OFC/NFOEC2005), Anaheim Convention Center, CA, USA
• [Journal Article] Photonic Analog-to-Digital Conversion using Optical Fiber Nonlinearities (2004)
  • Author(s): K.Ikeda, S.Oda, A.Maruta, S.Namiki(Furukawa Ele.), K.Kitayama
  • Journal Title: 2004 International Microwave Symposium(IMS2004), Fort Worth Texas USA
• [Journal Article] Experimental Demonstration of Optical Quantization by Slicing Supercontinuum Spectrum for All-Optical Analog-to-Digital Conversion (2004)
  • Author(s): Sho-ichiro Oda, Akihiro Maruta
  • Journal Title: The 9th Optoelectronics and Communications Conference/Third International Conference on Optical Internet (OECC/COIN 2004)
• [Journal Article] Experimental Demonstration of Optical Qauntizer Based on Slicing Supercontinuum (2004)
  • Author(s): S.Oda, A.Maruta
  • Journal Title: 30th European Conference on Optical Communications (ECOC2004), Sweden, Stockholm, Sweden