Studies on Wavelength Selective Filter and Light Source for Wavelength Division Multiplexing Utilizing the Third-Order Nonlinear Effect in Optical Fibers

利用光纤三阶非线性效应进行波分复用的波长选择滤波器和光源的研究

• 批准号: 09450026
• 负责人: IMAI Masaaki
• 金额: $ 6.98万
• 依托单位: Muroran Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 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-09450026/
• 关键词: Third-Order Nonlinear Effect; Nonlinear Directional Fiber Coupler; Wavelength Dependent Coupling; Supercontinuum Spectrum; Optical Soliton Compression; Chromatic Dispersion Management; Group Velocity Dispersion; Nonlinear Refractive Index; 光制御光波長フ

1. When a fiber directional coupler that is fabricated by fusing and elongating two single-mode fibers is excited with an intense laser light, an intensity dependent index of refraction is induced due to an optical Kerr effect and it modifies the linear coupling characteristics of the coupler. An abrupt change of power transmission at coupled and through ports in the coupler can be observed at a certain wavelength of incident light and it was found that the critical wavelength is shifted to a longer wavelength as the incident power increases. The experimental verification using a mode-locked Ti : sapphire laser that produces approximately 50 femtosecond pulses at wavelengths of 800-850nm with a repetition rate of 80MHz is followed by the theory. Although some discrepancies exist between theoretical calculations and experimental results, all-optical switching of the femtosecond pulses was confirmed in a nonlinear directional fiber coupler.2. The supercontinuum (SC) generation in optical … More fibers is attractive for high-condensed wavelength-division (or frequency-division) multiplexing system since it provides short optical pulses over a broad spectrum range. In this study, some computer simulations are carried out for the SC spectrum from adispersion-flattened fiber with group velocity dispersion varied along the axis. Taking into account of higher-order dispersion effects (the third, fourth, and fifth-order ones), higher-order nonlinear effects (self-steepening and stimulated Raman scattering (SRS) effects), and wavelength dependent losses, we concluded that ( i )a dispersion-decreasing fiber with group velocity dispersion being convex of the wavelength at two zero-dispersion wavelengths as well as ( ii )a fiber having an increasing nonlinear effect (or equivalently, decreasing effective core area) along the axis, and for an incident pulse (iii)the excitation of higher-order soliton that accompanies a higher peak power of optical pulses are desirable for efficient SC generation. Less

1.当用强激光激发通过熔融和拉伸两个单模光纤而制造的光纤定向耦合器时，由于光学克尔效应而引起依赖于强度的折射率，并且它修改耦合器的线性耦合特性。当入射光为某一波长时，耦合器的耦合端口和直通端口处的功率传输发生突变，并且随着入射功率的增加，临界波长向长波方向移动。实验验证使用锁模钛：蓝宝石激光器，产生约50飞秒脉冲的波长为800- 850 nm，重复率为80 MHz的理论。虽然理论计算与实验结果存在一定的差异，但在非线性定向光纤耦合器中实现了飞秒脉冲的全光开关.光学中超连续谱（SC）的产生 ...更多信息 光纤对于高度浓缩的波分（或频分）复用系统是有吸引力的，因为它在宽的光谱范围上提供短的光脉冲。本文对群速度色散沿轴向沿着变化的色散平坦光纤的SC谱进行了计算机模拟。考虑高阶色散效应（三阶、四阶和五阶）、高阶非线性效应（自陡峭和受激拉曼散射（SRS）效应），以及波长相关损耗，我们得出结论：（i）群速度色散在两个零色散波长处是波长的凸形的色散减小光纤，以及（ii）沿着轴具有增加的非线性效应（或等效地，减小的有效芯面积）的光纤，以及对于入射脉冲（iii）伴随光脉冲的较高峰值功率的高阶孤子的激发对于有效的SC产生是期望的。少

项目成果

曽根宏靖: "伝搬方向特性変化ファイバによるSUPERCONTINUUM発生およびパルス圧縮効果の数値解析" 電子情報通信学会技術研究報告,CS 98-50. 98・148. 13-18 (1998)

Hiroyasu Sone：“使用具有可变传播方向特性的光纤对 SUPERCONTINUUM 生成和脉冲压缩效应进行数值分析”，IEICE 技术报告，CS 98・148 (1998)。

曽根宏靖: "波長依存損失と高次の分散及び非線形効果を考慮した分散フラット/減少ファイバによるSupercontinuum発生" 電子情報通信学会技術研究報告,OCS 98-72. 98・412. 31-36 (1998)

Hiroyasu Sone：“考虑波长相关损耗、高阶色散和非线性效应，使用色散平坦/递减光纤产生超连续谱”IEICE 技术报告，OCS 98·412 (1998)。

Masaaki Imai: "Wavelength selective coupling and switching in a nonlinear fused-tapered coupler" Technical Digest of Third Optoelectronics and Communications Conference (OECC'98). 14P-54. 294-295 (1998)

Masaaki Imai：“非线性熔融锥形耦合器中的波长选择性耦合和切换”第三届光电与通信会议 (OECC98) 技术文摘。

Masaaki Imai et al: ""A fused-tapered fiber coupler all-optical switch using femtosecond optical pulses"" Proceedings of SPIE in Applications of Photonic Technology 3(ICAPT'98). 3491. 45-50 (1998)

Masaaki Imai 等人：“使用飞秒光脉冲的熔融锥形光纤耦合器全光开关”SPIE 光子技术应用论文集 3(ICAPT98)。

Masaaki Imai: "All-optical switching of femtosecond pulses in a nonlinear fused-tapered fiber coupler" IEICE Trans.Electronics,Joint Special Issue on Third Optoelectronics and Communications Conference. E82-C(掲載予定). (1999)

Masaaki Imai：“非线性熔融锥形光纤耦合器中的飞秒脉冲全光切换”IEICE Trans.Electronics，第三届光电子和通信会议联合特刊（即将出版）。