Polarization-independent enhanced-resolution arrayed-waveguide grating used in spectral-domain optical low-coherence reflectometry

B.I. Akça, Lantian Chang, G. Sengo, Kerstin Worhoff, R.M. de Ridder, Markus Pollnau

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    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 solution to this problem, a polarization-independent AWG is demonstrated, which can reduce the size and cost of OCLR and optical coherence tomography systems further by eliminating the components for polarization control.
    Original languageEnglish
    Pages (from-to)848-850
    Number of pages3
    JournalIEEE photonics technology letters
    Issue number10
    Publication statusPublished - May 2012


    • Optical Coherence Tomography
    • Optical low-coherence reflectometry
    • Arrayed waveguide grating

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