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首页> 外文会议>RIAO/OPTILAS 2004 >Variable optical attenuator using active multimode interference waveguide
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Variable optical attenuator using active multimode interference waveguide

机译：使用有源多模干涉波导的可变光衰减器

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摘要

We propose a new structure for an integrated variable optical attenuator using InGaAsP multiple quantum wells. The principle of operation relies on the self-imaging properties of multimode interference (MMI) waveguides. The device consists of a MMI region that is 12 μm wide by 350 μm long, with input and output waveguides that are 2 μm wide. The dimensions of the MMI are calculated such that an image of the input field is produced at the output waveguide. The last statement is true as long as the phase relation between the modes in the MMI section is kept constant. Therefore, by selectively perturbing the refractive index within the MMI section, the phase relation of the modes is altered, thereby modifying the interference properties at the output of the device. We present numerical simulations using the Finite-Difference Beam Propagation Method (FD-BPM), and demonstrate that optical attenuation is possible by selectively modulating the refractive index of a narrow region within the MMI section. A dynamic range of-37 dB can be easily obtained at a wavelength of 1.55 μm with a device insertion loss of 0.3 dB. The effects of electro-absorption on the device performance are also investigated.
机译：我们提出了一种使用InGaAsP多量子阱的集成可变光衰减器的新结构。工作原理取决于多模干涉（MMI）波导的自成像特性。该器件由一个MMI区域组成，该区域的宽度为12μm，长度为350μm，输入和输出波导的宽度为2μm。计算MMI的尺寸，以便在输出波导处产生输入场的图像。只要MMI部分中的模式之间的相位关系保持恒定，最后一条语句就是正确的。因此，通过有选择地扰动MMI部分内的折射率，可以改变模式的相位关系，从而可以改变设备输出端的干涉特性。我们目前使用有限差分光束传播方法（FD-BPM）进行数值模拟，并证明通过有选择地调制MMI部分内狭窄区域的折射率可以实现光衰减。在波长为1.55μm且器件插入损耗为0.3 dB的情况下，可以轻松获得-37 dB的动态范围。还研究了电吸收对器件性能的影响。

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