Bandwidth control of long-period grating-based mode converters in few-mode fibers.
Bandwidth control of long-period grating-based mode converters in few-mode fibers.
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DOI：
10.1364/ol.27.000698
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发表时间：
2002-05
期刊：
影响因子：
3.6
通讯作者：
S. Ramachandran;Zhiyong Wang;M. Yan
中科院分区：
文献类型：
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作者：
S. Ramachandran;Zhiyong Wang;M. Yan
对少模光纤中两种不同模式之间的群速度差的控制可用于定义写入其中的长周期光栅的光谱特性。利用这种效应，我们报告了长周期光纤光栅在被认为是创纪录的 63 nm 带宽上的强模式转换 (>99%) 的演示。这些新颖的光谱是从专门设计的少模光纤中写入的光栅获得的，其中在很大的光谱范围内满足光栅相位匹配条件。我们表明，可以通过适当改变少模光纤的设计来定制此类模式转换器的带宽。模式转换器的偏振相关耦合在整个光谱范围内的变化小于 0.004%。
Control of the group-velocity differences between two distinct modes in a few-mode fiber can be used to define the spectral characteristics of long-period gratings written in them. Using this effect, we report the demonstration of strong mode conversion (>99%) with long-period fiber gratings over what is believed to be a record bandwidth of 63 nm. These novel spectra are obtained from gratings written in specially designed few-mode fibers in which the grating phase-matching condition is satisfied over a large spectral range. We show that the bandwidths of such mode converters can be tailored by suitably altering the design of the few-mode fibers. The polarization-dependent coupling for the mode converters varies by less than 0.004% over the entire spectrum.