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Multi-wavelength pulse source using fowner synthesis

使用 fowner 合成的多波长脉冲源

基本信息

批准号：
10555014
负责人：
KIKUCHI Kazuro
金额：
$ 7.42万
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 (B)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10555014/
关键词：
Supercontinuum Optical fiber WDM 光ファイバ通信光パルスフーリエ光学

项目摘要

Recent Progress in supercontinuum (SC) generation from optical fibers in the 1550-nm band has exploited its attractive applications to a spectral-slicing pulse source used in WDM systems.In this work, we study how wideband and flat SC can be generated from optical fibers, and then apply such SC to optical communication systems.First, we find the following SC generation mechanism in a dispersion-flattened fiber (DFF) with a Small normal group-velocity dispersion (GVD).The frequency chirp induced by SPM interplays with the normal GVD, making the pulse waveform nearly parabolic before tile pulse width becomes much broader. The frequency chirp induced by all ideal parabolic waveform is a linear function of time across the entire pulse width, and the accumulation of such linear chirp results in flat spectral broadening. While the pulse propagates further, the parabolic waveform changes into the rectangular waveform, and the spectral broadening is eventually stopped. By using such fiber, we have succeeded in generating SC whose 10-dB width is as wide as 280 nm.We next demonstrate a multiwavelength pulse source by slicing super-continuum with an arrayed-waveguide grating filter. Over 20-channels of pulse train with an repetition rate of 10 GHz are realized, and each channel has almost the same pulse width. This uniformity originates from tile fact that the super-continuum pulse generated in a normal-dispersion fiber has a rectangular waveform and a linear chirp.

1550 nm 波段光纤产生超连续谱 (SC) 的最新进展已经开发出其在 WDM 系统中使用的光谱切片脉冲源的有吸引力的应用。在这项工作中，我们研究如何从光纤产生宽带且平坦的 SC，然后将这种 SC 应用于光通信系统。首先，我们在具有小法线的色散平坦光纤 (DFF) 中发现以下 SC 生成机制群速度色散 (GVD)。SPM 引起的频率啁啾与正常 GVD 相互作用，使脉冲波形在脉冲宽度变得更宽之前接近抛物线形。所有理想抛物线波形引起的频率啁啾在整个脉冲宽度上都是时间的线性函数，并且这种线性啁啾的累积导致平坦的频谱展宽。当脉冲进一步传播时，抛物线波形变为矩形波形，并且光谱展宽最终停止。通过使用这种光纤，我们成功地产生了10dB宽度达280nm的SC。接下来，我们通过使用阵列波导光栅滤波器切割超连续谱来演示多波长脉冲源。实现了超过20通道重复频率为10 GHz的脉冲序列，并且每个通道具有几乎相同的脉冲宽度。这种均匀性源自于正常色散光纤中产生的超连续谱脉冲具有矩形波形和线性啁啾。