Continuously wavelength-tunable passband-flattened fiber comb filter based on polarization-diversified loop structure

Abstract Continuous wavelength tuning of optical comb filters, which is an essential functionality for flexible signal processing in reconfigurable optical systems, has been challenging in high order filter structures with two birefringent elements (BEs) or more due to cumbersomeness in finding a co...

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Autores principales:	Jaehoon Jung, Yong Wook Lee
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/c936c7a0c5fa492396850e5976cda29e
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spelling	oai:doaj.org-article:c936c7a0c5fa492396850e5976cda29e2021-12-02T11:53:12ZContinuously wavelength-tunable passband-flattened fiber comb filter based on polarization-diversified loop structure10.1038/s41598-017-06952-z2045-2322https://doaj.org/article/c936c7a0c5fa492396850e5976cda29e2017-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-06952-zhttps://doaj.org/toc/2045-2322Abstract Continuous wavelength tuning of optical comb filters, which is an essential functionality for flexible signal processing in reconfigurable optical systems, has been challenging in high order filter structures with two birefringent elements (BEs) or more due to cumbersomeness in finding a combination of waveplates and BEs and complexity in determining their individual azimuthal orientations. Here, we propose a continuously tunable polarization-independent passband-flattened fiber comb filter with two BEs using a polarization-diversified loop structure for the first time. The proposed filter consists of a polarization beam splitter and two groups of a half-wave plate, quarter-wave plate, and polarization-maintaining fiber (PMF). The azimuthal orientation of PMF in the second group is fixed as 22.5°. Orientation angle sets of the four waveplates, which can induce an arbitrary phase shift from 0 to 2π in the passband-flattened transmittance function, are found from the filter transmittance derived using Jones matrix formulation. From theoretical spectral analysis, it is confirmed that passband-flattened comb spectra can be continuously tuned. Theoretical prediction is verified by experimental demonstration. Moreover, the wavelength-dependent evolution of the output state of polarization (SOP) of each PMF is investigated on the Poincare sphere, and the relationship between wavelength tuning and SOP evolution is also discussed.Jaehoon JungYong Wook LeeNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-10 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Jaehoon Jung Yong Wook Lee Continuously wavelength-tunable passband-flattened fiber comb filter based on polarization-diversified loop structure
description	Abstract Continuous wavelength tuning of optical comb filters, which is an essential functionality for flexible signal processing in reconfigurable optical systems, has been challenging in high order filter structures with two birefringent elements (BEs) or more due to cumbersomeness in finding a combination of waveplates and BEs and complexity in determining their individual azimuthal orientations. Here, we propose a continuously tunable polarization-independent passband-flattened fiber comb filter with two BEs using a polarization-diversified loop structure for the first time. The proposed filter consists of a polarization beam splitter and two groups of a half-wave plate, quarter-wave plate, and polarization-maintaining fiber (PMF). The azimuthal orientation of PMF in the second group is fixed as 22.5°. Orientation angle sets of the four waveplates, which can induce an arbitrary phase shift from 0 to 2π in the passband-flattened transmittance function, are found from the filter transmittance derived using Jones matrix formulation. From theoretical spectral analysis, it is confirmed that passband-flattened comb spectra can be continuously tuned. Theoretical prediction is verified by experimental demonstration. Moreover, the wavelength-dependent evolution of the output state of polarization (SOP) of each PMF is investigated on the Poincare sphere, and the relationship between wavelength tuning and SOP evolution is also discussed.
format	article
author	Jaehoon Jung Yong Wook Lee
author_facet	Jaehoon Jung Yong Wook Lee
author_sort	Jaehoon Jung
title	Continuously wavelength-tunable passband-flattened fiber comb filter based on polarization-diversified loop structure
title_short	Continuously wavelength-tunable passband-flattened fiber comb filter based on polarization-diversified loop structure
title_full	Continuously wavelength-tunable passband-flattened fiber comb filter based on polarization-diversified loop structure
title_fullStr	Continuously wavelength-tunable passband-flattened fiber comb filter based on polarization-diversified loop structure
title_full_unstemmed	Continuously wavelength-tunable passband-flattened fiber comb filter based on polarization-diversified loop structure
title_sort	continuously wavelength-tunable passband-flattened fiber comb filter based on polarization-diversified loop structure
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/c936c7a0c5fa492396850e5976cda29e
work_keys_str_mv	AT jaehoonjung continuouslywavelengthtunablepassbandflattenedfibercombfilterbasedonpolarizationdiversifiedloopstructure AT yongwooklee continuouslywavelengthtunablepassbandflattenedfibercombfilterbasedonpolarizationdiversifiedloopstructure
_version_	1718394893273923584

Continuously wavelength-tunable passband-flattened fiber comb filter based on polarization-diversified loop structure

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