| Title |
Continuously Wavelength-Tunable Zeroth-Order Fiber Multiwavelength Filter Based On Polarization-Diversity Loop Structure |
| Authors |
Do Kyeong Kim ; Yong Wook Lee |
| DOI |
http://dx.doi.org/10.5207/JIEIE.2017.31.9.081 |
| Keywords |
Fiber Comb Filters ; Polarization ; Polarization-Diversity Loop Structure |
| Abstract |
In this paper, a polarization-diversity-loop-based zeroth-order fiber multiwavelength filter, which could provide a continuous wavelength tunability, was experimentally implemented by incorporating two quarter-wave plates(QWPs). The filter was fabricated by using a polarization beam splitter(PBS), two QWPs, and polarization-maintaining fiber(PMF). One end of PMF was butt-coupled to the PBS so that its slow axis should be oriented at 45° for the horizontal axis of the PBS, and the other end was connected to the QWP. On the basis of theoretical prediction on eight orientation angle sets of two QWPs, which gave the filter transmittance function eight different phase shifts of 0 to 7π/4 with a π/4 step, the wavelength tuning characteristics of the transmission spectrum of the fabricated filter was experimentally verified. It was confirmed that the appropriate control of two QWP orientation angles could continuously tune the transmission spectrum of the fabricated filter. |