概括
研究人员建议使用轨道角动量 (OAM) 模式的辐射指数来提高通信能力. 这种方法复合了角形和半径OAM模式,使得更多的数据传输成为可能.
科学领域:
- 光学通信是指光学通信的应用.
- 光子学 是一个光子学.
- 信息理论是信息理论.
背景情况:
- 轨道角动量 (OAM) 束提供了通过独特的角度指数增加通信能力的潜力.
- 光学系统开口的限制限制了OAM光束的角度指数的可用范围.
- 现有的光纤系统可以支持不完全利用的直角模式通道.
研究的目的:
- 提出和演示一种新的方法,通过延长它们的辐射指数来复杂化轨道角动量 (OAM) 模式.
- 通过引入新的复杂化维度来克服光学系统的光圈限制.
- 通过二维 (2D) OAM模式多重复合来增强光通信系统的容量.
主要方法:
- 引入空间离散的多相平面,用于同时进行角度和辐射OAM模式的多重复合.
- 在模式转换中利用中心对称OAM模式的直角性质.
- 通过反向设计采用卡特西安到日志极坐标转换,将2D高斯波束数组转换为同轴OAM模式.
- 设计和制造一个使用五相平面为高阶辐射OAM模式的10模式多重处理器.
主要成果:
- 成功设计和制造了适用于10个高阶辐射OAM模式的多重处理器.
- 产生高质量的多重化OAM模式,测量损失低于5.4dB.
- 通过使用模式-场匹配,在2公里的环芯光纤上稳定传输多重 OAM 模式.
结论:
- 拟议的方法有效地复合了角度和辐射OAM模式,为增加通信通道提供了可扩展的解决方案.
- 这种方法克服了光圈限制,并充分利用光纤中直角模式的全部潜力.
- 展示的技术为OAM复杂化在高容量通信系统中的实际应用铺平了道路.
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