We demonstrate the algebraic cancellation of residual phase cross talk in digitally enhanced heterodyne interferometry (DEHeI), a code division multiplexing technique for interferometric sensing. By using linear combinations of parallel decoding operations at multiple delays, we synthesize a zero correlation for spurious signals and remove phase cross talk: a method we call offset decoding. We experimentally demonstrate 70 dB of signal isolation and over 40 dB greater isolation than the equivalent standard implementation of DEHeI.

中文翻译：

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多路外差干涉测量中通道间串扰的代数消除

我们展示了数字增强外差干涉测量 (DEHeI) 中残余相位串扰的代数消除，DEHeI 是一种用于干涉传感的码分复用技术。通过在多个延迟下使用并行解码操作的线性组合，我们合成了杂散信号的零相关性并消除了相位串扰：我们称这种方法为偏移解码。我们通过实验证明了 70 dB 的信号隔离和比 DEHeI 的等效标准实现高 40 dB 以上的隔离。