Method and apparatus for improving sidelobe cancellation in coded optical time-domain reflectometry

Abstract

Methods and apparatus for characterizing optical fiber links by optical time-domain reflectometry are disclosed. To resolve compromises between the signal-to-noise ratio, duration, and resolution of optical-time domain reflectometry measurements, embodiments of the present disclosure use coded sequences of return-to-zero light pulses. Each return-to-zero light pulse in a coded sequence includes a guard interval to mitigate the effects of pulse shape distortions. In some embodiments, the sequences of return-to-zero light pulses encode complementary Golay correlation codes. Some embodiments provide methods for encoding and decoding the sequences of return-to-zero pulse sequences. Some embodiments provide an optical time-domain reflectometry apparatus including a light source unit, optical coupler, light sensor, and processing device.

Dependencies are inferred from the claim text.