Abstract
Here, we present a continuously wavelength-controllable narrowband birefringence filter utilizing polarization-diversity loop. A polarization beam splitter, three half-wave plates, two quarter-wave plates, and two polarization-maintaining fiber with equal length were used to configure the filter. First, the orientation angle sets of the five waveplates that can induce an extra phase difference from 0 to 360° to the narrowband transmittance function derived using Jones matrix formulation were theoretically found. Then, among the found waveplate angle sets, transmission spectra were calculated for eight waveplate angle sets(Sets I－VIII) that can add extra phase differences from 0 to 315° with a step of 45° to the narrowband transmittance function. In the calculated transmission spectra, when the waveplate angle set was sequentially switched from Set I to Set VIII, the wavelength of the narrowband transmission spectrum could be shifted by 0.1nm. In particular, the theoretically predicted wavelength controllability of the filter was experimentally demonstrated.
Published Version
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