A dual-loop Sagnac interferometer

• 来源期刊: 中国物理B（英文版）
• 关键词: Sagnac interferometer polarization controller
• 年，卷（期）: 2009,（7）
• 页码范围: 2801-2805
• 页数: 5页
• 语种: 英文

摘要

A new type of all-fibre Sagnac interferometer composed of two loops is proposed and analysed in detail. It can be used with a very long transmission line while maintaining excellent performance characteristics due to the automatic compensation of any birefringence effects in the trunk fibre. Preliminary experiments at 1310 nm wavelength with a 70 km long trunk fibre demonstrated an interference visibility as high as 98%, indicating that this scheme has promising potential applications.