In:
Japanese Journal of Applied Physics, IOP Publishing, Vol. 61, No. 3 ( 2022-03-01), p. 032001-
Abstract:
By harnessing quarter-wave polarization transformation, we propose a polarization-independent wavelength-tunable flat-top fiber comb filter composed of a polarization beam splitter, two polarization-maintaining fiber segments of equal length, a set of a half-wave plate and a quarter-wave plate (QWP), and dual QWPs, the simplest polarization controller. Using the Jones calculus, we derived the polarization-independent filter transmittance and sought the possible loci of the orientation angles (OAs) of the four waveplates as the functions of the transmittance phase ( ϕ ). With these OA loci, flat-top transmission spectra were calculated for eight ϕ values from 0° to 315° (increment: 45°), which manifests the frequency tunability of the filter. This theoretical prediction was also experimentally verified by using a broadband light source and optical spectrum analyzer. Eight measured flat-top transmission spectra were spaced 0.1 nm apart in wavelength as predicted, and the wavelength-tuning linearity was high enough to exhibit an adjusted R 2 value of ∼0.99925.
Type of Medium:
Online Resource
ISSN:
0021-4922
,
1347-4065
DOI:
10.35848/1347-4065/ac4a07
Language:
Unknown
Publisher:
IOP Publishing
Publication Date:
2022
detail.hit.zdb_id:
218223-3
detail.hit.zdb_id:
797294-5
detail.hit.zdb_id:
2006801-3
detail.hit.zdb_id:
797295-7
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