Continuously tunable polarization-independent zeroth-order fiber comb filter based on polarization-diversity loop structure

Jung, Jaehoon; Lee, Yong Wook

doi:10.1007/s00340-017-6697-8

Cited by 9 publications

(1 citation statement)

References 27 publications

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“…Among the various comb filters, PDLS-based comb filters are more efficient than other comb filters in terms of wavelength switching or tuning of comb spectra [15,16] and generation of higher-order comb spectra [17,18]. Wavelength tunability in zeroth-order PDLS comb filters has been achieved theoretically and experimentally in 2017 by incorporating three types of ordered waveplate combinations, such as a set of a half-wave plate (HWP) and a quarter-wave plate (QWP), a set of a QWP and an HWP, and two QWPs [19,20]. Even in the case of firstorder PDLS comb filters, the wavelength tunability of flat-top [21][22][23] and narrowband [24][25][26] comb spectra has been explored until recently using composite waveplate combinations of HWPs and QWPs.…”

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confidence: 99%

Wavelength-Tunable First-Order Narrowband Fiber Comb Filter Incorporating All-Quarter-Wave Polarization Transformation

Jung,

Lee

2024

IEEE Photonics J.

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In this study, we propose a wavelength-tunable first-order narrowband fiber comb filter that incorporates allquarter-wave polarization transformation. The proposed filter is composed of a polarization beam splitter to form a polarizationdiversified fiber loop, two equally long polarization-maintaining fiber segments, and four quarter-wave plates to modify the absolute phase of the narrowband transmittance of the filter. The transmittance function of the filter was found theoretically utilizing the Jones matrix formulation. Based on this filter transmittance, we derived the azimuthal angles (AAs) of the waveplates, which can tune the spectral wavelength of the filter by continuously adjusting the transmittance phase. Narrowband comb spectra calculated at some selected sets of these four waveplate AAs showed sequential wavelength changes. In particular, the calculation result was experimentally validated.

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