Abstract
Optical frequency domain reflectometry (OFDR) has high spatial resolution and high sensitivity compared with optical time domain reflectrometry, provided the phase noise of optical source is cancelled. A new method was proposed to cancel phase noise in the OFDR. The proposed method detects short-distance and long-distance breakpoints with high spatial resolution. Double side band with a suppress carrier modulation was used with phase diversity detection. Experiments confirmed that the proposed method was achievable. Breakpoints at approximate distance 120 m were detected as short-distance breakpoints and ~20 as long distance. Performance of the proposed method has been further demonstrated by measuring expansion in fiber length due to change in temperature.
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