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We demonstrate 200-channel high-density frequency division multiplexing coherent OTDR employing apodization and nonlinear suppression schemes. The sensitivity enhancement is 13 dB by comparison with conventional coherent OTDR.
We describe PNC-OFDR employing 3rd order sideband sweeping to realize a broader frequency sweep span. We achieved a sub-cm spatial resolution over a 10 km measurement range.
This paper proposes a novel optical sampling technique for monitoring ultrafast signal waveforms. The dual-channel sampling system, which employs two parallel interferometers offset by a slight relative delay, enables us to observe not only intensity but also phase (frequency) modulation without any restriction as regards signal coherence. The proposed method, based on linear interaction with local...
This paper experimentally investigates the effect of frequency error compensation via demodulation automatic frequency control (AFC) using the synchronization channel (SCH) in downlink OFDM radio access. The implemented OFDM receiver compensates for the frequency error caused by the difference in frequency between a base station (BS) and a user equipment (UE) using a time-division multiplexed SCH...
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