High Rejection and Frequency Agile Optical Filtering of RF Signals Using a Rare Earth Ion-Doped Crystal

Ulrich, Lothaire; Welinski, Sacha; Chauvet, Anne Louchet; Rosny, Julien de; Dolfi, Daniel; Vaneph, Cyril; Berger, Perrine; Morvan, Loïc

doi:10.1109/jlt.2022.3170216

Cited by 2 publications

(1 citation statement)

References 21 publications

(22 reference statements)

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“…By controlling its structure and periodicity, precise control and modulation of optical waves can be achieved. In optical communication systems, multi-channel filters and wavelength division multiplexers are widely used [16,[23][24][25][26][27][28][29][30][31][32][33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Optical fractal in cryogenic environments based on distributed feedback Bragg photonic crystals

Zhao,

Chen,

Liu

et al. 2023

PLoS ONE

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We studied the optical fractal effect of the one-dimensional distributed feedback Bragg photonic crystals formed by semiconductor GaAs and dielectric TiO2. Light wave is transmitted in the intermediate dielectric slab and reflected back by the periodic photonic crystals at both ends, forming multiple fractal resonance output. The transmission channels expand exponentially by thickening the bulk in a cryogenic environment. The quality factor of each fractal resonant state improves with a greater periodic number of crystals. Furthermore, central wave of resonance has a blue-shift as the external pressure increases, while the influence of environment temperature on the fractal resonance could be ignored. It is hoped that our study can highlight the potential of these findings for designing multi-channel communication filters in cryogenic environments.

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Section: Introductionmentioning

confidence: 99%

Optical fractal in cryogenic environments based on distributed feedback Bragg photonic crystals

Zhao,

Chen,

Liu

et al. 2023

PLoS ONE

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Cavity-enhanced narrowband spectral filters using rare-earth ions doped in thin-film lithium niobate

Zhao,

Renaud,

Farfurnik

et al. 2024

npj Nanophoton.

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On-chip optical filters are fundamental components in optical signal processing. While rare-earth ion-doped crystals offer ultra-narrow optical filtering via spectral hole burning, their applications have primarily been limited to those using bulk crystals, restricting their utility. In this work, we demonstrate cavity-enhanced spectral filtering based on rare-earth ions in an integrated nonlinear optical platform. We incorporate rare-earth ions into high quality-factor ring resonators patterned in thin-film lithium niobate. By spectral hole burning at 4 K in a critically coupled resonance mode, we achieve bandpass filters ranging from 7 MHz linewidth, with 13.0 dB of extinction, to 24 MHz linewidth, with 20.4 dB of extinction. By reducing the temperature to 100 mK to eliminate phonon broadening, we achieve an even narrower linewidth of 681 kHz, which is comparable to the narrowest filter linewidth demonstrated in an integrated photonic device, while only requiring a small device footprint. Moreover, the cavity enables reconfigurable filtering by varying the cavity coupling rate. For instance, as opposed to the bandpass filter, we demonstrate a bandstop filter utilizing an under-coupled ring resonator. Such versatile integrated spectral filters with high extinction ratio and narrow linewidth could serve as fundamental components for optical signal processing and optical memories on-a-chip.

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High Rejection and Frequency Agile Optical Filtering of RF Signals Using a Rare Earth Ion-Doped Crystal

Cited by 2 publications

References 21 publications

Optical fractal in cryogenic environments based on distributed feedback Bragg photonic crystals

Optical fractal in cryogenic environments based on distributed feedback Bragg photonic crystals

Cavity-enhanced narrowband spectral filters using rare-earth ions doped in thin-film lithium niobate

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