| Title |
Analysis of Transmission Spectrum Characteristics of Second-Order Fiber Flexible Comb Filter Based on Polarization-Diversity Loop |
| Authors |
Kyoungsoo Park ; Yong Wook Lee |
| DOI |
http://dx.doi.org/10.5207/JIEIE.2015.29.12.001 |
| Keywords |
Fiber Comb Filter ; High Birefringence Fiber ; Polarization-Diversity Loop |
| Abstract |
In this paper, we propose a second-order fiber flexible comb filter based on a polarization-diversity loop(PDL). The proposed filter consists of a polarization beam splitter, four half-wave plates(HWPs), and three high birefringence fiber(HBF) segments. In the previous Solc-type second-order filter based on the PDL, HBF segments were fusion-spliced with a fixed angle offset between their principal axes with each other. But, the proposed filter implemented by inserting two HWPs between three HBF segments has a great flexibility in adjusting relative angular difference between the principal axes of two adjacent HBF segments. Owing to this flexibility, second-order transmission spectra, which had a channel spacing of ～0.8nm, could be interleaved by controlling the orientation angles of four HWPs. The output transmission spectra of the proposed filter were theoretically analyzed and experimentally verified. |