1. Polarization-Independent Enhanced-Resolution Arrayed-Waveguide Grating Used in Spectral-Domain Optical Low-Coherence Reflectometry

    Polarization-Independent Enhanced-Resolution Arrayed-Waveguide Grating Used in Spectral-Domain Optical Low-Coherence Reflectometry

    The performance of an arrayed-waveguide grating (AWG) as an integrated spectrometer in spectral-domain optical low-coherence reflectometry (SD-OLCR) is significantly improved. By removing the output waveguides of the AWG, the depth range is enhanced from 1 to 3.3 mm at 800 nm and 4.6 mm at 1300 nm. Periodic signal fading, that was previously observed in the sensitivity roll-off curve in depth ranging measurements, is shown to be evoked by beat-frequency generation between the two polarizations of partially polarized signal light in a birefringent AWG. By carefully controlling the polarization state-of-light, the signal fading is eliminated. As a permanent ...

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