Selective mode multiplexer based on phase plates and Mach-Zehnder interferometer with image inversion function
Selective mode multiplexer based on phase plates and Mach-Zehnder interferometer with image inversion function
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DOI：
10.1364/oe.23.000183
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发表时间：
2015-01-12
期刊：
影响因子：
3.8
通讯作者：
Tsuritani, Takehiro
中科院分区：
文献类型：
--
作者：
Igarashi, Koji;Souma, Daiki;Tsuritani, Takehiro
我们提出了一种基于相位板的新型模式多路复用器，后接具有图像反转功能的马赫-曾德干涉仪 (MZI)。通过相位板选择性地从基本线性偏振 (LP) 模式转换高阶模式后，使用具有图像反转的 MZI 将转换后的模式无基本损耗地耦合，其中光信号的原始空间模式和反转模式相互干扰。我们的方案也适用于退化LP模式的耦合，例如LP11a和LP11b。首先，我们通过数值和实验评估基于相位板的模式转换器的性能。只要在少模光纤 (FMF) 中维持 LP01、LP11ab 和 LP21ab 等五种 LP 模式，该模式转换器就适用，尽管当 LP02 上的高阶模式在 FMF 中维持时，由于不需要的模式的激励而导致的串扰是不可避免的。接下来，我们开发并表征了所提出的基于相位板和具有图像反转的 MZI 的模式多路复用器。对于 LP11a 和 LP11b 的模式复用，插入损耗被抑制到 3 dB 左右。使用 LP31a 和 LP31b 制造的模式复用器，我们测量了单偏振模式复用正交相移键控光信号的误码率性能。 (C) 2015年美国光学学会
We propose a novel mode multiplexer based on phase plates followed by a Mach-Zehnder interferometer (MZI) with image inversion. After the higher-order modes are selectively converted from fundamental linear-polarized (LP) modes by the phase plates, the converted modes are coupled without fundamental loss using MZI with image inversion, in which the original spatial pattern and inverted pattern of the optical signal are interfered. Our scheme is also applicable to the coupling of degenerated LP modes such as LP11a and LP11b. First, we numerically and experimentally evaluate the performance of the mode converter based on phase plates. The mode converter is suitable as long as the five LP modes such as LP01, LP11ab and LP21ab are sustained in a few-mode fiber (FMF), although the crosstalk due to excitation of undesirable modes is unavoidable when the higher-order modes over LP02 are sustained in FMF. Next, we develop and characterize the proposed mode multiplexers based on phase plates and MZIs with image inversion. The insertion loss is suppressed to around 3 dB for mode multiplexing of LP11a and LP11b. Using a fabricated mode multiplexer for LP31a and LP31b, we measure the bit-error rate performance of single-polarization mode-multiplexed quadrature-phase shift keying optical signals. (C) 2015 Optical Society of America