Tailoring Spectral Response of Grating-Assisted Co-Directional Couplers with Weighting Techniques and Rational Transfer Functions: Theory and Experiment
This work addresses the tailoring spectral response of grating-assisted co-directional couplers (GADCs) in the context of wavelength filtering for fiber-to-the-home (FTTH) applications. Design methods for spectral response engineering by means of coupling profile apodization-type weighting technique...
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MDPI AG
2025-01-01
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| Series: | Photonics |
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| Online Access: | https://www.mdpi.com/2304-6732/12/1/73 |
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| author | Anatole Lupu |
| author_facet | Anatole Lupu |
| author_sort | Anatole Lupu |
| collection | DOAJ |
| description | This work addresses the tailoring spectral response of grating-assisted co-directional couplers (GADCs) in the context of wavelength filtering for fiber-to-the-home (FTTH) applications. Design methods for spectral response engineering by means of coupling profile apodization-type weighting techniques and also more advanced rational transfer functions fitting a predefined spectral window template are presented. Modeling results based on coupled mode theory are then applied for the design and experimental fabrication of InGaAsP/InP GADCs targeting 1.3+/1.3− µm diplexer application in FTTH access networks. The experimental results are found to be in good agreement with the modeling predictions. The design tools presented are quite general and can be easily adapted to other technology platforms, such as silicon photonics for the use of GADCs as add-drop wavelength division multiplexers. The field of parity–time symmetry is another avenue where these types of gain–loss-assisted GADCs as active components are of interest for switching applications, and the design methods presented here may find utility. |
| format | Article |
| id | doaj-art-453e3c706bd148f9aa16dfb7ede9d63a |
| institution | Kabale University |
| issn | 2304-6732 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Photonics |
| spelling | doaj-art-453e3c706bd148f9aa16dfb7ede9d63a2025-01-24T13:46:25ZengMDPI AGPhotonics2304-67322025-01-011217310.3390/photonics12010073Tailoring Spectral Response of Grating-Assisted Co-Directional Couplers with Weighting Techniques and Rational Transfer Functions: Theory and ExperimentAnatole Lupu0Centre de Nanosciences et de Nanotechnologies, CNRS, Université Paris-Saclay, C2N—10 Boulevard Thomas Gobert, 91120 Palaiseau, FranceThis work addresses the tailoring spectral response of grating-assisted co-directional couplers (GADCs) in the context of wavelength filtering for fiber-to-the-home (FTTH) applications. Design methods for spectral response engineering by means of coupling profile apodization-type weighting techniques and also more advanced rational transfer functions fitting a predefined spectral window template are presented. Modeling results based on coupled mode theory are then applied for the design and experimental fabrication of InGaAsP/InP GADCs targeting 1.3+/1.3− µm diplexer application in FTTH access networks. The experimental results are found to be in good agreement with the modeling predictions. The design tools presented are quite general and can be easily adapted to other technology platforms, such as silicon photonics for the use of GADCs as add-drop wavelength division multiplexers. The field of parity–time symmetry is another avenue where these types of gain–loss-assisted GADCs as active components are of interest for switching applications, and the design methods presented here may find utility.https://www.mdpi.com/2304-6732/12/1/73integrated opticswavelength division multiplexingfiber-to-the-home applicationsgrating-assisted co-directional couplersapodization techniquesinverse-scattering methods |
| spellingShingle | Anatole Lupu Tailoring Spectral Response of Grating-Assisted Co-Directional Couplers with Weighting Techniques and Rational Transfer Functions: Theory and Experiment Photonics integrated optics wavelength division multiplexing fiber-to-the-home applications grating-assisted co-directional couplers apodization techniques inverse-scattering methods |
| title | Tailoring Spectral Response of Grating-Assisted Co-Directional Couplers with Weighting Techniques and Rational Transfer Functions: Theory and Experiment |
| title_full | Tailoring Spectral Response of Grating-Assisted Co-Directional Couplers with Weighting Techniques and Rational Transfer Functions: Theory and Experiment |
| title_fullStr | Tailoring Spectral Response of Grating-Assisted Co-Directional Couplers with Weighting Techniques and Rational Transfer Functions: Theory and Experiment |
| title_full_unstemmed | Tailoring Spectral Response of Grating-Assisted Co-Directional Couplers with Weighting Techniques and Rational Transfer Functions: Theory and Experiment |
| title_short | Tailoring Spectral Response of Grating-Assisted Co-Directional Couplers with Weighting Techniques and Rational Transfer Functions: Theory and Experiment |
| title_sort | tailoring spectral response of grating assisted co directional couplers with weighting techniques and rational transfer functions theory and experiment |
| topic | integrated optics wavelength division multiplexing fiber-to-the-home applications grating-assisted co-directional couplers apodization techniques inverse-scattering methods |
| url | https://www.mdpi.com/2304-6732/12/1/73 |
| work_keys_str_mv | AT anatolelupu tailoringspectralresponseofgratingassistedcodirectionalcouplerswithweightingtechniquesandrationaltransferfunctionstheoryandexperiment |