We present an experimental demonstration of notch filters with arbitrary center wavelengths capable of tunable analog output power values varying between full extinction of 15 and 0 dB. Each filter is composed of highly modular apodized four-port Bragg add/drop filters to reduce the crosstalk between concatenated devices. The constructed photonic integrated circuit experimentally demonstrates spectra shaping using four independent notch filters. Each notch filter supports a bandwidth of ∼2 nm and is shown to be suitable for realization of programmable photonic integrated circuits.

中文翻译：

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新型光谱整形模块：窄带 Mach-Zehnder 干涉仪

我们展示了具有任意中心波长的陷波滤波器的实验演示，该滤波器能够在 15 和 0 dB 的完全消光之间变化可调模拟输出功率值。每个滤波器由高度模块化的切趾四端口布拉格分插滤波器组成，以减少级联设备之间的串扰。构建的光子集成电路使用四个独立的陷波滤波器通过实验证明了光谱整形。每个陷波滤波器支持~2 nm 的带宽，并被证明适用于实现可编程光子集成电路。