| Title |
Study on Continuous Wavelength Tuning of Flat-Top Band Multiwavelength SpectrumUsing Composite Waveplate Combination within Polarization-Diversity Loop Structure |
| Authors |
Jinsil Han ; Yong Wook Lee |
| DOI |
http://doi.org/10.5207/JIEIE.2021.35.4.021 |
| Keywords |
Flat-top band; Multiwavelength filter; Wavelength tuning |
| Abstract |
In this paper, we propose a flat-top band birefringence filter capable of continuously controlling the wavelength with a combination of waveplates using polarization-diversity loop structure(PDLS). The proposed filter consists of polarization beam splitter(PBS), two polarization-maintaining fibers(PMF) of the same length, two half-wave plates(HWP), and two quarter-wave plates(QWP). Based on the filter transmittance derived through Jones calculus, we found a combination of orientation angles of the four waveplates which could induce an extra phase difference φ from 0° to 360° in the flat-top band transmittance function. Then the calculated transmission spectrum was derived from the eight sets of orientation angles combination of waveplates selected to add φ from 0° to 315° at intervals of 45°. In conclusion, we constructed the multiwavelength filter and verified the theoretical prediction experimentally by implementing a flat-top transmission spectrum. |