Frequency Domain Multiplexing is a signal transmission technique in which multiple signals are combined and transmitted simultaneously over a single channel by assigning each signal a distinct frequency band. The signals are modulated onto different carrier frequencies and separated at the receiver using filters. This approach enables efficient use of bandwidth and is widely used in telecommunications, optical networks, and sensing systems, including wavelength division multiplexing in fiber optics.
We propose a method to compensate 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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