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Study on simplified schems for coupling between laser diodes and single-mode fibers

激光二极管与单模光纤耦合简化方案的研究

基本信息

批准号：
05452202
负责人：
SHIRAISHI Kazuo
金额：
$ 3.9万
依托单位：
Utsunomiya university
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05452202/
关键词：
Optical fiber Expanded core fiber Laser diode Lensed fiber Coreless fiber Optical coupling Coupling loss Aspheric lens 結合結合効率非球面アレイ単一モード光ファイバビーム伝搬法レンズドファイバ

项目摘要

The intergrated light coupling scheme from laser diode arrays to single-mode fiber arrays shown is one of important technologies in constructing practical fiber networks. Hemispherical end fibers for this use have desirable features, such as simple, stable, and the potential for attaining high coupling efficiency.For the purpose, a reasonable working distance (an air gap between diodes and fibers) longer than -100 mum is required not to make contact between them during an automatic as sembling process. Conventional lensed fibers, however, need very short (less than 10 mum) working distances. We proposed a new lensed-fiber configuration which enables a long working distance with a high coupling losses.The new configuration consists of a coreless fiber chip spliced onto an expanded core fiber. In contrast to the conventional one, we can make use of the cladding as a part of the lens. The working distance could been increased to roughly the size of the cladding diameter. Analyzes developped in the research and experiments show that a large core diameter rather than high NA (namely, expanded core fiber) is preferable to attain a high coupling efficiency. The fabrication process is as follows. A coreless fiber tip with 125-mum diameter and 980-mum length was spliced onto the expanded core fiber whose modal field diameter at the wavelength 1.49mum is expanded to 45 mm from the original size, 10mum. The other side of the tip was melted into a hemispherical profile with the radius R=75 mum by use of an arc-discharge fiber splicer.The minimum coupling loss obtained was 4.3 dB at the working distance 160 mum. The long working-distance operation with a long working distance has been published. We have successfully performed the research.

所提出的半导体激光器阵列与单模光纤阵列的集成光耦合方案是构建实用光纤网络的重要技术之一。为此目的，需要大于-100 μ m的合理工作距离（二极管和光纤之间的空气间隙），以在自动组装过程中不使它们之间接触。然而，传统的透镜光纤需要非常短（小于10 μ m）的工作距离。提出了一种新的透镜光纤结构，该结构由一个无芯光纤芯片拼接到一个扩展芯光纤上，可以实现长工作距离和高耦合损耗。与传统的方法相比，我们可以利用包层作为透镜的一部分。工作距离可以增加到大约包层直径的大小。研究和实验结果表明，大芯径光纤比高数值孔径光纤（即扩芯光纤）更有利于获得高耦合效率。制作过程如下。将直径为125 μ m、长度为980 μ m的无芯光纤尖端拼接到扩展芯光纤上，该扩展芯光纤在波长1.49 μ m处的模场直径从原始尺寸10 μ m扩展到45 mm。用电弧放电光纤熔接器将针尖的另一侧熔化成半径为R = 75 μ m的半球形轮廓，在工作距离为160 μ m时得到的最小耦合损耗为4.3 dB。已发布了具有长工作距离的长工作距离操作。我们成功地进行了研究。