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A liquid lens switching-based motionless variable fiber-optic delay line

机译:基于液镜切换的静止不可变光纤延迟线

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摘要

We present a Variable Fiber-Optic Delay Line (VFODL) module capable of imparting long variable delays by switching an input optical/RF signal between Single Mode Fiber (SMF) patch cords of different lengths through a pair of Electronically Controlled Tunable Lenses (ECTLs) resulting in a polarization-independent operation. Depending on intended application, the lengths of the SMFs can be chosen accordingly to achieve the desired VFODL operation dynamic range. If so desired, the state of the input signal polarization can be preserved with the use of commercially available polarization-independent ECTLs along with polarization-maintaining SMFs (PM-SMFs), resulting in an output polarization that is identical to the input. An ECTL-based design also improves power consumption and repeatability. The delay switching mechanism is electronically-controlled, involves no bulk moving parts, and can be fully-automated. The VFODL module is compact due to the use of small optical components and SMFs that can be packaged compactly.
机译:我们介绍了一种可变光纤延迟线(VFODL)模块,该模块能够通过一对电控可调透镜(ECTL)在不同长度的单模光纤(SMF)跳线之间切换输入光学/ RF信号,从而赋予较长的可变延迟。导致偏振无关的操作。根据预期的应用,可以相应地选择SMF的长度,以实现所需的VFODL操作动态范围。如果需要的话,可以使用市售的不依赖偏振的ECTL以及保持偏振的SMF(PM-SMF)来保持输入信号的偏振状态,从而产生与输入相同的输出偏振。基于ECTL的设计还改善了功耗和可重复性。延迟切换机构是电子控制的,不涉及大量运动部件,并且可以实现全自动。由于使用了可以紧凑封装的小型光学组件和SMF,因此VFODL模块非常紧凑。

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