Study on all optical signal regeneration technology in ultrafast optical communication system

超快光通信系统全光信号再生技术研究

• 批准号: 12305026
• 负责人: KIKUCHI Kazuro
• 金额: $ 22.6万
• 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 (A)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12305026/
• 关键词: all opticall signal regeneration; nonlinear optical device; Optical switch; WDM; OTDM; 光ファイバ通信; 超短光パルス; クロック抽出; ソノグラム

All-optical nonlinear interferometric switches (NIS) are very attractive devices to realize the all optical 2R/3R function. The Mach-Zehnder interferometer (MZI) using semiconductor optical amplifiers and the nonlinear optical loop mirror (NOLM) using dispersion-shifted fibers are good candidates for practical NIS configurations.When these NIS 's are periodically inserted in a long-distance transmission system using optical amplifiers, we can expect that the NIS's prevent the degradation of the SNR induced by the accumulation of the optical amplifier noise.We derive a simple formula for calculating the SNR in the transmission system where NIS's are periodically inserted. Prom this formula, we clearly see that the SNR can be maintained at a certain value even after the signal traveling over an infinite distance. This formula also predicts that there exists a critical level of the optical amplifier noise. When the optical amplifier noise is larger than the critical level, the improvement of the SNR can no longer be achieved.We also construct a NOLM composed of a 50-m highly-nonlinear dispersion-shifted fiber, and succeed in switching of 0.5-ps optical pulses. In addition, the polarization diversity scheme for the NOLM is demonstrated.

全光非线性干涉开关是实现全光2 R/3R功能的一种非常有吸引力的器件。采用半导体光放大器的马赫-曾德尔干涉仪（MZI）和采用色散位移光纤的非线性光学环形镜（NOLM）是实用的NIS结构的良好候选者。我们可以预期，NIS的防止由光放大器噪声的积累引起的SNR的退化。周期性插入NIS的传输系统中的SNR。从这个公式中，我们清楚地看到，即使在信号传播了无限远之后，信噪比也可以保持在一定的值。该公式还预言了光放大器噪声存在一个临界值。当光放大器噪声大于临界值时，信噪比的提高不再可能.我们还构造了一个由50-m高非线性色散位移光纤组成的NOLM，并成功地实现了0.5-ps光脉冲的开关.此外，极化分集方案的NOLM演示。

项目成果

Han Chuen Lim, T. Sakamoto, and K. Kikuchi: "Polarization-independent optical demultiplexing by conventional nonlinear optical loop mirror in a polarization diversity loop configuration"IEEE Photonics Technol. Lett.. vol.12, no.12. 1704-1706 (2000)

Han Chuen Lim、T. Sakamoto 和 K. Kikuchi：“偏振分集环路配置中传统非线性光学环路镜的偏振无关光学解复用”IEEE Photonics Technol。

T.Sakamoto, K.Kikuchi: "Analyses of all-optically regenerated transmission system using nonlinear interferometric switches"IEEE Photonics Technol. Lett.. 13,9. 1020-1021 (2001)

T.Sakamoto、K.Kikuchi：“使用非线性干涉开关的全光再生传输系统的分析”IEEE Photonics Technol。

K.Taira and K.Kikuchi: "Highly-sensitive frequency-resolved optical gating in the 1.55 um region using an organic nonlinear opticalcrystal for second-harmonic generation"IEEE Photonics Technology Lett.. 36,20. 1719-1720 (2000)

K.Taira 和 K.Kikuchi：“使用有机非线性光学晶体在 1.55 um 区域实现二次谐波产生的高灵敏度频率分辨光学选通”IEEE 光子技术快报 36,20。

T.Sakamoto, K.Kikuchi: "Analyses of all-optically regenerated transmission system using nonlinear interferometric switches"IEEE Photonics Technol. Lett.. 13. 1020-1021 (2001)

T.Sakamoto、K.Kikuchi：“使用非线性干涉开关的全光再生传输系统的分析”IEEE Photonics Technol。

T.Sakamoto et al.: "All-optical wavelength conversion of 500-fs pulse trains by using nonlinear-optical evop mirror・・・"IEEE Photonics Technol. Lett.. 13. 502-504 (2001)

T. Sakamoto 等人：“使用非线性光学 evop 镜对 500-fs 脉冲串进行全光波长转换...” IEEE Photonics Technol.. 13. 502-504 (2001)