Development of an optical system for perfect coupling in the DWDM optical communication system

DWDM光通信系统中完美耦合光学系统的开发

• 批准号: 12555095
• 负责人: SHIRAISHI Kazuo
• 金额: $ 7.55万
• 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: 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/en/grant/KAKENHI-PROJECT-12555095/
• 关键词: optical fiber; field distribution; GI fiber; lensed fiber; optical communication; laser diode; graded index; 光ファイバ増幅器; 結合損失

This research has successfully finished. We aimed the development of optical system for perfect coupling between pumping laser diodes (LDs) and receiving optical fibers in the DWDM system, and achieved the aim by using wedge-shaped graded-index (GI) lensed fibers. In this research we evaluated the optical radiation characteristics of high-power semiconductor LDs at first. Next, we designed and produced (1) wedge-shaped GI lensed fibers and (2) cascade-type wedge-shaped GI lensed fibers. As a result, the wedge-shaped GI fibers succeeded in improving the coupling coefficient between LDs and fibers compared with conventional techniques. Following are summaries of the results.1. Development of wedge-shaped GI fibersHigh-power semiconductor LDs for pumping EDFAs are designed to emit elliptical modal fields at their endface with high aspect ratio from 2 over 40. In addition, they tend to have large astigmatism of over 100 μm. As the aspect ratio is higher, the coupling losses between these L … More Ds and receiving optical single-mode fibers become larger using conventional lensed fibers. We propose a new lensed fiber employing a wedge-shaped GI fiber, of which the coupling loss is estimated to be 2.5 dB. We fabricated the proposed fiber and investigated its coupling loss characteristic, but the coupling loss was 5.8 dB. Because some differences between designed structural parameters of the fiber and measured ones exist.2. Development of cascaded-type wedge-shaped GI fibersIn order to improve the not small coupling loss of 5.8 dB, we proposed a new fiber employing two cascaded GI fiber chips with a wedge-shaped end. The cascade-type wedge-shaped GI fiber achieves high-efficiency coupling with LDs even if the LDs have large astigmatism. We fabricated the proposed fibers for the LD with an aspect ratio at the endface of 42 and astigmatism of 176 μm. We experimentally confirmed that the proposed lensed fiber had a low coupling loss of 2.5 dB and a long working distance of 67 μm. We also investigated the tolerance characteristics for various displacements. Less

这项研究已经成功完成。为了实现密集波分复用系统中泵浦激光二极管（LD）与接收光纤之间的理想耦合，研制了一种新型的楔形渐变折射率（GI）透镜光纤。在本研究中，我们首先评估了大功率半导体激光器的光辐射特性。接下来，我们设计并制造了（1）楔形GI透镜光纤和（2）级联型楔形GI透镜光纤。结果，与传统技术相比，楔形GI光纤成功地提高了LD与光纤之间的耦合系数。以下是结果摘要。楔形GI光纤的研制用于泵浦掺铒光纤放大器的大功率半导体激光器设计成在其端面发射具有2到40的高纵横比的椭圆模场。此外，它们往往具有超过100 μm的大像散。当纵横比更高时，这些L ...更多信息 DS和接收光学单模光纤使用常规透镜光纤变得更大。我们提出了一种新的透镜光纤采用楔形GI光纤，其耦合损耗估计为2.5 dB。我们制作了所提出的光纤，并研究了其耦合损耗特性，但耦合损耗为5.8 dB。由于光纤的设计结构参数与实测结构参数之间存在一定的差异.级联型楔形GI光纤的研制为了改善5.8dB的耦合损耗，我们提出了一种采用两个级联的楔形端GI光纤芯片的新型光纤。级联型楔形GI光纤实现了与LD的高效耦合，即使LD具有大的像散。我们制作的光纤端面长径比为42，像散为176 μm。实验结果表明，该透镜光纤具有2.5dB的低耦合损耗和67 μm的长工作距离。我们还研究了各种位移的公差特性。少

项目成果

H.Yoda: "A lensed fiber employing a wedge-shaped GIF for high-efficiency coupling between SMFs and high-power LDs having ultra-high aspect ratio"27th European Conference on Optical Communication Proceedings. 3. 418-419 (2001)

H.Yoda：“采用楔形 GIF 的透镜光纤，用于 SMF 和具有超高纵横比的高功率 LD 之间的高效耦合”第 27 届欧洲光通信会议论文集。

A.Ogura: "A field-profile transformer utilizing a graded-index oval-core (GIO) fiber"IEEE/OSA Journal of Lightwave Technology. 19・1(in press). (2001)

A.Ogura：“利用渐变折射率椭圆芯 (GIO) 光纤的场剖面变压器”IEEE/OSA 光波技术杂志 19・1（出版中）。

H.Yoda: "A new scheme of a lensed fiber employing a wedge-shaped graded-index fiber tip for the coupling between high-power laser diodes and single-mode fibers"IEEE/LEOS Workshop on Fiber Optic Passive Components Proceedings. 106-111 (2000)

H.Yoda：“采用楔形渐变折射率光纤尖端的透镜光纤新方案，用于高功率激光二极管和单模光纤之间的耦合”IEEE/LEOS 光纤无源元件研讨会论文集。

H.Yoda: "A new scheme of a lensed fiber employing a wedge-shaped graded-index fiber tip for the coupling between high-power laser diodes and single-mode fibers"IEEB/OSA Journal of Lightwave Technology. 19・12. 1910-1917 (2001)

H.Yoda：“采用楔形渐变折射率光纤尖端的透镜光纤新方案，用于高功率激光二极管和单模光纤之间的耦合”，IEEB/OSA 光波技术杂志 19・12。 -1917 (2001)

A. Ogura: "Efficient coupling between laser diodes and single-mode fibers by means of GIO fibers"27th European Conference on Optical Communication Proceedings. 4. 624-625 (2001)

A. Ogura：“通过 GIO 光纤实现激光二极管和单模光纤之间的高效耦合”第 27 届欧洲光通信会议论文集。