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首页> 外文期刊>IEEE Journal of Quantum Electronics >Programmable Spectral Design Using a Simple Binary Bragg-Diffractive Structure
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Programmable Spectral Design Using a Simple Binary Bragg-Diffractive Structure

机译：使用简单的二元布拉格衍射结构的可编程光谱设计

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摘要

We present the binary supergrating (BSG), a digital approach to spectral engineering that permits the near-arbitrary control of optical amplitude and phase in a wavelength-dependent manner. The BSG is a guided-wave technology that consists of an aperiodic sequence of binary elements, leading to a simple, robust and practical form. This sequence, determined through the process of BSG synthesis, encodes an optical program that defines device functionality. Our approach to synthesis builds on existing knowledge in the design of "analog" gratings through a two-step process: first, exploit the best analog-domain methods, then transform the resulting structure into binary form. Accordingly, we explore the notion of diffractive structure transformation and introduce the principle of "key information." We assemble such key information for Bragg-regime structures, and employ it in the design of grating quantizers based on an atypical form of Delta-Sigma modulation. We illustrate this approach through the synthesis of a complex dense-wavelength division-multiplexed telecom filter featuring 50-GHz channel spacing, -40-dB stopbands, and 25-GHz-wide passbands that are flat to within 0.2 dB.
机译：我们介绍了二进制超级光栅（BSG），这是一种光谱工程的数字方法，允许以依赖于波长的方式近乎任意地控制光学幅度和相位。 BSG是一种导波技术，由不定期的二进制元素序列组成，从而导致简单，可靠且实用的形式。通过BSG合成过程确定的此序列对定义设备功能的光学程序进行编码。我们的合成方法基于“模拟”光栅设计中的现有知识，分两步进行：首先，利用最佳的模拟域方法，然后将所得结构转换为二进制形式。因此，我们探索了衍射结构转变的概念，并介绍了“关键信息”的原理。我们将这些关键信息汇总为布拉格体制的结构，并将其用于基于非典型形式的Delta-Sigma调制的光栅量化器的设计中。我们通过合成复杂的密集波分复用电信滤波器来说明这种方法，该滤波器具有50 GHz的信道间隔，-40 dB的阻带​​和平坦的0.2 dB以内的25 GHz宽通带。

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