| Title |
Spectral Characteristics of Multiwavelength-Switchable First-Order Fiber Flexible Filter based on Polarization-Diversity Loop |
| Authors |
Kyoungsoo Park ; Youngho Kim ; Yong Wook Lee |
| DOI |
http://dx.doi.org/10.5207/JIEIE.2014.28.8.006 |
| Keywords |
Multiwavelength-Switchable ; Flexible Filter ; Polarization-Diversity Loop ; Zeroth-Order |
| Abstract |
In this paper, a multiwavelength-switchable first-order fiber flexible filter is newly proposed, which is based on a polarization-diversity loop. The proposed filter consists of a polarization beam splitter, three half-wave plates(HWPs), and two high birefringent fibers(HBFs). The proposed filter has a good flexibility in adjusting relative angular difference between the principal axes of two HBFs by inserting an HWP between two HBFs. The first-order flat-top or narrow band transmission spectra and the zeroth-order transmission spectra, which had a channel spacing of ∼0.8nm, could be obtained by controlling the three HWPs, and, in particular, each of them could also be interleaved. In addition, zeroth-order transmission spectra with a channel spacing of ∼0.8nm could be flexibly converted into those with a channel spacing of ∼0.4nm through the control of three HWPs, and also be interleaved. The transmission characteristics of the proposed filter was theoretically analyzed and experimentally verified. |