Research and development of fiber-amplifier-integrated optical isolator

光纤放大器集成光隔离器的研发

• 批准号: 02505003
• 负责人: KAWAKAMI Shojiro
• 金额: $ 28.03万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research (A)
• 财政年份: 1990
• 资助国家: 日本
• 起止时间: 1990 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02505003/
• 关键词: Fiber Integration; Isolator; Polarization Splitter; LPS; 偏光合離素子; 光アイソレ-タ; TECファイバ; 光ファイバ; スポットサイズ

(1)Fiber-integrated optical isolatorWe made an isolator chip composed of Faraday rotator, lambda/2 plate, and polarization splitter (rutile). Fiber-in-line structure was realized using TEC fiber, which was used for reducing the insertion loss. Isolation 45dB, insertion loss 3.5dB, and reflection attenuation 47dB were obtained. This technology leads to lens-free and alignment-free integration, so it is suitable for large-scale integration of optical devices.We are trying to realize a high performance optical isolator by replacing the rutile with the laminated polarization splitter.(2)Laminated polarization splitter (LPS)We made the LPS composed of a-Si : H and SiO_2 films and obtained the branching angle 15.5ﾟ, which is nearly equal to the theoretical value. It was found that the high insertion loss was due to roughness of each film surface. We flattened the film surface by bias sputtering. LPS, fabricated by this method, has losses of 0.16dB and 0.17dB for ordinary and extraordinary beam, respectively.

(1)光纤集成光隔离器我们制作了一种由法拉第旋转器、λ /2板和偏振分离器（金红石）组成的隔离芯片。采用TEC光纤实现了直插式结构，降低了插入损耗。隔离度45dB，插入损耗3.5dB，反射衰减47dB。该技术可实现无透镜、无准直集成，适用于光学器件的大规模集成。我们试图用层状偏振分路器代替金红石来实现一种高性能的光隔离器。(2)制备了a-Si: H和SiO_2薄膜组成的层合极化分离器（Laminated polarization splitter， LPS），得到了与理论值接近的分支角15.5。研究发现，高的插入损耗是由于各膜表面的粗糙度所致。我们用偏压溅射使薄膜表面变平。该方法制备的LPS在普通和特殊光束下的损耗分别为0.16dB和0.17dB。

项目成果

K.Shiraishi: "Experimental uerification of a formーbirefringent polariyation splitter" Applied Physics Letters. 58. 211-212 (1991)

K. Shiraishi：“形状双折射偏振分离器的实验验证”《应用物理快报》58. 211-212 (1991)。

K.Shiraishi: "New conbiguration of polariyationーindependent isolator using a polariyationーdependent one" Electronics Letters. 27. 302-303 (1991)

K. Shiraishi：“使用极化相关隔离器的极化独立隔离器的新配置”《电子快报》27. 302-303 (1991)。

T.Sato: "Laminated polarization splitter with a large split angle" Applied Physics Letters. 61. 2633-2634 (1992)

T.Sato：“具有大分光角的层压偏振分光器”《应用物理快报》。

中善寺 知広: "光ファイバ集積型偏波依存アイソレータ" 電ハ情報通信学会技術報告. 0QE92-101. 19-24 (1992)

Tomohiro Chuzenji：“光纤集成偏振相关隔离器”电气和通信工程师协会的技术报告 0QE92-101 (1992)。

川上 彰二郎: "光ファイバ形超小型光デバイス" 電子情報通信学会技術研究報告. OQE90. 43-48 (1990)

Shojiro Kawakami：“光纤型超小型光学器件”IEICE技术研究报告OQE90（1990）。