Frequency-Division Multiplexed Time-Interleaved Phase-OTDR with Nested Phase References

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Publication Date: 3/15/2026

Event: OFC 2026

Reference: W3D.2: 1-3, 2026

Authors: Ezra Ip, NEC Laboratories America, Inc.; Yue-Kai Huang, NEC Laboratories America, Inc.; Fatih Yaman, NEC Laboratories America, Inc.; Junqiang Hu, NEC Laboratories America, Inc.; Ting Wang, NEC Laboratories America, Inc.

Abstract: We propose a method to compensate for the phase offset between samples from different tributaries in time-interleaved phase OTDR using nested phase reference channels. We demonstrate our method for a four-span bidirectional link with high-loss loopback.

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