Study on optical field transformation by means of GI elliptic-core fibers

GI椭圆芯光纤光场变换研究

• 批准号: 11450133
• 负责人: SHIRAISHI Kazuo
• 金额: $ 4.03万
• 依托单位: Utsunomiya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B).
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11450133/
• 关键词: optical fiber; field distribution; GI fiber; GIO fiber; optical communication; laser diode; optical fiber amplifier; 楕円コア; グレーデッドインデックス

The research has successfully finished. We aimed to(1)experimentally verify the field transformation in GIO(graded-index oval core)fiber and to(2)realize GIO fibers made of silicate glasses. Both of the purposes have been accomplished within the term of the project. In addition to the success, a new coupling scheme utilizing silica GIO fibers have been constructed. it was found that the new scheme is extremely ef fective to realize low-loss coupling between laser diodes with highly elliptic-field and single-mode fibers. Following are summaries of the results.1. Experimental verification of the operationWe used commercially available plastic GI fibers to fabricate GIO fibers for the simplicity. The GIO fiber with core aspect ratio of 3.2 was successfully fabricated by pressing a GI fiber at the temperature of 180°C for 25 minutes. It was confirmed that a circular field of the simgle-mode fiber was transformed into an elliptic field with aspect ratio of 3.2.2. Silica GIO fiber with a high performanceWe tried to fabricate silica GIO fibers by using silica performs for commercial GI fibers. As the result, silica GIO fibers having core aspect ratio more than 3, specifically as large as 3.5 and 4.2, have been successfully fabricated. The operation of the fibers was also experimentally verified. The second aim has also performed.3. Application of the GIO fiberBy using silica GIO fiber, a new coupling scheme between LD with field aspect ratio of 3.5 and single-mode fiber was fabricated. It was found that the coupling loss was measured to be as low as 0.65 dB, showing that the GIO fiber is an extremely useful device in optical communication systems.

这项研究已经成功完成。我们的目标是（1）实验验证梯度折射率椭圆芯（GIO）光纤中的场变换和（2）实现硅酸盐玻璃GIO光纤。这两个目标都在项目期限内实现了。除了成功，一个新的耦合方案，利用二氧化硅GIO光纤已建成。研究发现，这种新方案对于实现高椭圆场激光二极管与单模光纤的低损耗耦合非常有效。以下是结果摘要。实验验证的操作我们使用商业上可获得的塑料GI纤维制造GIO纤维的简单性。通过在180°C的温度下压制GI光纤25分钟，成功地制备了芯长径比为3.2的GIO光纤。证实了单模光纤的圆形场被转换成纵横比为3.2.2的椭圆形场。高性能的二氧化硅GIO光纤我们尝试用商业GI光纤的二氧化硅预制体来制备二氧化硅GIO光纤。结果，已经成功地制造了芯纵横比大于3，特别是大到3.5和4.2的二氧化硅GIO光纤。光纤的操作也进行了实验验证。第二个目标也实现了。GIO光纤的应用利用石英GIO光纤，制作了场宽比为3.5的半导体激光器与单模光纤的新型耦合方案。结果表明，GIO光纤的耦合损耗低至0.65 dB，表明GIO光纤在光通信系统中是非常有用的器件。

项目成果

室幸市: "20゜以上の分離角を有する積層形偏光分離素子用光学多層膜の低損失化"電子情報通信学会論文誌. J82-C-I・12. 824-825 (1999)

室小一：“分离角为20°以上的叠层偏振分光器的低损耗”电子信息通信技术学会会刊J82-C-I·12（1999）。

A.Ogura: "Silica GIO fibers with high performance"Optical Fiber Communication Conference. ThC5 (2001)

A.Ogura：“高性能二氧化硅GIO光纤”光纤通信会议。

K.Shiraishi: "A new lensed-fiber configuration employing cascaded GI-fiber chips"IEEE/OSA Journal of Lightwave Technology. 18・6. 787-794 (2000)

K. Shiraishi：“采用级联 GI 光纤芯片的新型透镜光纤配置”，IEEE/OSA 光波技术杂志 18・6 (2000)。

A.Ogura: "Experimental verification of the modal-field transformation in silica-based GIO fibers"Workshop on Fiber Optic Passive Components. 164-167 (2000)

A.Ogura：“基于二氧化硅的 GIO 光纤中模场变换的实验验证”光纤无源元件研讨会。

A.Ogura: "A Modal-field transformer for LD modules"IEEE Lasers and Electro-Optic Society, 1999 Annual Meeting. paper ThX2 (1999)

A.Ogura：“用于 LD 模块的模态场变压器”IEEE 激光和电光协会，1999 年年会。