BROADBAND SPECTRUM ULTRASHORT PULSE GENERATION WITH ARBITRARY REPETITION FREQUENCY EMPLOYING SEMICONDUCTOR LASERS

利用半导体激光器产生任意重复频率的宽带频谱超短脉冲

• 批准号: 09650380
• 负责人: TSUCHIYA Masahiro
• 金额: $ 1.86万
• 依托单位: THE UNIVERSITY OF TOKYO
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09650380/
• 关键词: OPTICAL SOLITON; OPTICAL PULSE COMPRESSION; OPTICAL PULSE SHAPING; OPTICAL FIBERS; SEMICONDUCTOR LASER; DISPERSOIN MANAGEMENT; GAIN SWITCHING; NONLINEAR OPTICAL FIBER LOOP; 非線形シュレディンガー方程式; ラマン効果

Recently, the capacity of fiber-optic signal transmission per an optical fiber is more than several 100 Gbps and exceeding 1 Tbps. What have supported these trends are the wavelength division multiplexing and optical time division multiplexing techniques. In those techniques, one of the most important and fundamental issues is ultrashort pulse generation from semiconductor lasers in the 1500 nm wavelength range. The aim of this research project is to implement a method-to generate broadband spectrum ultrashort optical pulse of high quality by means of fiber-optic compression schemes out of gain-switched semiconductor diode laser pulse having arbitrary repetition frequencies. We have succeeded in the getting the following results. (1) We found out that it is important to take into account the higher order nonlinear effects like the Raman effect and the higher order dispersion effects in optical fibers when we design fiber optic compressors for sub-100 fs pulse generation. (2) According to the above guideline for the design, we implemented a rather simpler soliton compressor and applied it to pico-second gain-switched laser diode pulses. Resultant width of 44 fs was obtained, which is one of the shortest pulses ever obtained in the 1500 nm wavelength range. (3) Furthermore, we constructed nonlinear optical fiber loops to eliminate the pedestals accompanying the ultrashort pulses in the above, and have obtained successful pedestal suppression (>20 dB), which has given resultant 55 fs pedestal free optical pulses. (4) The optical spectra obtained in the pulses thus generated were found to contain fairly broadband spectra of 100 to 250 nm, which are quite attractive for the WDM optical source. We believe thus the goal of the project has been reached and we have established a technology to generate sub-100 fs high quality optical pulses in the 1550 nm wavelength range.

近来，每根光纤的光纤信号传输容量超过几百Gbps并且超过1Tbps。支持这些趋势的是波分复用和光时分复用技术。在这些技术中，最重要和最基本的问题之一是从1500 nm波长范围内的半导体激光器产生超短脉冲。本研究的目的是实现一种利用光纤压缩技术从具有任意重复频率的增益开关半导体二极管激光脉冲中产生高质量的宽带光谱超短光脉冲的方法。我们成功地取得了以下成果。(1)我们发现，当我们设计用于产生亚100 fs脉冲的光纤压缩器时，考虑光纤中的高阶非线性效应如拉曼效应和高阶色散效应是很重要的。(2)根据上述设计原则，我们实现了一个相对简单的孤子压缩器，并将其应用于皮秒增益开关半导体激光脉冲。获得了44 fs的合成宽度，这是在1500 nm波长范围内获得的最短脉冲之一。(3)此外，我们构建了非线性光纤环来消除上述超短脉冲伴随的基座，并获得了成功的基座抑制（>20 dB），从而产生了55 fs的无基座光脉冲。(4)发现在由此产生的脉冲中获得的光谱包含100至250 nm的相当宽的光谱，这对于WDM光源是相当有吸引力的。我们相信项目的目标已经达到，我们已经建立了一种在1550 nm波长范围内产生低于100 fs高质量光脉冲的技术。

项目成果

吉田 剛: "受動モード同期集積型半導体レーザの過飽和吸収領域におけるキャリアダイナミクス" 第46回応用物理学関係連合講演会講演予縞集. (発表予定). (1999)

Tsuyoshi Yoshida：“被动锁模集成半导体激光器过饱和吸收区的载流子动力学”第 46 届应用物理会议讲座集（待发表）。

R.Yatsu, K.Taira, M.Tsuchiya and T.Kamiya: "Pedestal suppression of 100 fs optical pulse by compound fiber loop mirror" Extended Abstracts of the 59^<th> Autumn Meeting of The Japan Society of Applied Physics, Hiroshiam, 1998. 16p-Y-3. 944 (1998)

R.Yatsu、K.Taira、M.Tsuchiya 和 T.Kamiya：“复合光纤环镜对 100 fs 光脉冲的基座抑制”日本应用物理学会第 59 届秋季会议扩展摘要，Hiroshiam

谷津亮介: "複合ファイバループミラーによる100fs光パルスのペデスタル除去" 第59回応用物理学会学術講演会. 16p-Y-3. 944 (1998)

Ryosuke Yatsu：“使用复合光纤环镜去除 100 fs 光脉冲的基座”第 59 届日本应用物理学会年会 16p-Y-3 (1998)。

K.Taira: "Sub-100fs pedestal-free optical pulse generation employing a nonlinear optical loop mirror" Technical Digest of International Topical Workshop on Contenporary Photonic Technologies (CPT'99). Wep-14. 131-132 (1998)

K.Taira：“采用非线性光学环路镜的亚 100fs 无基座光脉冲生成”当代光子技术国际专题研讨会 (CPT99) 的技术摘要。