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首页> 外文期刊>Optical Engineering >Comparison of the thermal tuning capability of different types of Bragg grating filters for wavelength division multiplexing applications
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Comparison of the thermal tuning capability of different types of Bragg grating filters for wavelength division multiplexing applications

机译：不同类型布拉格光栅滤光片在波分复用应用中的热调谐能力比较

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摘要

We compare the thermal tuning capabilities of two type I gratings written in unloaded and in hydrogen-loaded germanium-doped silica fibers, and a type Ila grating written in unloaded fiber. The hydrogen-loaded grating is annealed after writing, to remove any unreacted hydrogen. We further study the gratings' response stability with temperature, an important property when these devices are used as optical filters in wavelength division multiplexing systems. Experimental results show that the worst option is the type I grating in unloaded fiber, which presents the highest bandwidth and group delay variations with temperature, so that it is the least suitable as a thermotunable optical filter in wavelength-multiplexed systems. For the other two options, the bandwidth and group delay variations are much smaller, the lowest values being obtained with the hydrogen-loaded type I grating, and the best thermal tuning efficiency with the type Ila grating.
机译：我们比较了用空载和氢载锗掺杂二氧化硅纤维书写的两种I型光栅，以及用空载光纤书写的Ila型光栅的热调谐能力。载氢光栅在写入后进行退火处理，以去除任何未反应的氢气。我们进一步研究了光栅随温度的响应稳定性，这是这些器件在波分复用系统中用作滤光片时的一个重要特性。实验结果表明，最差的选择是空载光纤中的I型光栅，其带宽和群延迟随温度的变化最大，因此在波长复用系统中作为热调谐光滤波器最不合适。对于其他两个选项，带宽和群延迟变化要小得多，使用氢负载I型光栅获得最低值，使用Ila型光栅获得最佳热调谐效率。

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