Sustainable Transmitters for High-Capacity Metro-Access Networks
Single sideband (SSB) modulation enables high spectral efficiency, and ensures high throughput performance when combined with discrete multitone (DMT) modulation. The conventional approach for generating SSB signals involves an IQ modulator to combine a pair of signals related by the Hilbert transfo...
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IEEE
2025-01-01
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| Online Access: | https://ieeexplore.ieee.org/document/11025546/ |
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| author | Stefano Gaiani Alberto Gatto Paola Parolari Pierpaolo Boffi |
| author_facet | Stefano Gaiani Alberto Gatto Paola Parolari Pierpaolo Boffi |
| author_sort | Stefano Gaiani |
| collection | DOAJ |
| description | Single sideband (SSB) modulation enables high spectral efficiency, and ensures high throughput performance when combined with discrete multitone (DMT) modulation. The conventional approach for generating SSB signals involves an IQ modulator to combine a pair of signals related by the Hilbert transform. However, this method relies on a power-intensive device, less suitable for intensity-modulation direct-detection (IM-DD) systems in metropolitan-access networks. In this paper, we analyze and compare various architectures for achieving SSB modulation in a more sustainable way, either through optical filtering or by satisfying the Hilbert transform condition using less power-intensive devices. Specifically, we focus on a sustainable approach, addressed as the dual-modulator (DM) scheme, which is implemented by cascading a directly modulated VCSEL with a Mach-Zehnder modulator. At the receiver side, SSB modulation enables the use of a Kramers-Kronig (KK) receiver, providing an efficient compensation of chromatic dispersion. The comparison of the considered schemes is achieved by a suitable simulation tool that features the generation of a SSB-DMT signal, its propagation in an uncompensated single mode fiber, its detection with a KK receiver, and the subsequent signal processing and data decoding. The simulations evaluate the performance of the various architectures in terms of capacity as a function of the propagation distance (up to 50 km), comparing also the associated signal to noise ratio curves. The proposed VCSEL-based DM scheme appears to offer an excellent trade-off between performance and implementation complexity, supporting high throughput, high spectral efficiency, thanks to SSB-DMT modulation. |
| format | Article |
| id | doaj-art-bae00f79f6034c38a9568ddec06ca71f |
| institution | Kabale University |
| issn | 2169-3536 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IEEE |
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| spelling | doaj-art-bae00f79f6034c38a9568ddec06ca71f2025-08-20T03:44:54ZengIEEEIEEE Access2169-35362025-01-0113997349974310.1109/ACCESS.2025.357697711025546Sustainable Transmitters for High-Capacity Metro-Access NetworksStefano Gaiani0https://orcid.org/0009-0001-7727-9762Alberto Gatto1https://orcid.org/0000-0001-9090-983XPaola Parolari2https://orcid.org/0000-0002-6525-3290Pierpaolo Boffi3https://orcid.org/0000-0002-7480-9772Department of Electronics, Information and Bioengineering (DEIB), Politecnico di Milano, Milan, ItalyDepartment of Electronics, Information and Bioengineering (DEIB), Politecnico di Milano, Milan, ItalyDepartment of Electronics, Information and Bioengineering (DEIB), Politecnico di Milano, Milan, ItalyDepartment of Electronics, Information and Bioengineering (DEIB), Politecnico di Milano, Milan, ItalySingle sideband (SSB) modulation enables high spectral efficiency, and ensures high throughput performance when combined with discrete multitone (DMT) modulation. The conventional approach for generating SSB signals involves an IQ modulator to combine a pair of signals related by the Hilbert transform. However, this method relies on a power-intensive device, less suitable for intensity-modulation direct-detection (IM-DD) systems in metropolitan-access networks. In this paper, we analyze and compare various architectures for achieving SSB modulation in a more sustainable way, either through optical filtering or by satisfying the Hilbert transform condition using less power-intensive devices. Specifically, we focus on a sustainable approach, addressed as the dual-modulator (DM) scheme, which is implemented by cascading a directly modulated VCSEL with a Mach-Zehnder modulator. At the receiver side, SSB modulation enables the use of a Kramers-Kronig (KK) receiver, providing an efficient compensation of chromatic dispersion. The comparison of the considered schemes is achieved by a suitable simulation tool that features the generation of a SSB-DMT signal, its propagation in an uncompensated single mode fiber, its detection with a KK receiver, and the subsequent signal processing and data decoding. The simulations evaluate the performance of the various architectures in terms of capacity as a function of the propagation distance (up to 50 km), comparing also the associated signal to noise ratio curves. The proposed VCSEL-based DM scheme appears to offer an excellent trade-off between performance and implementation complexity, supporting high throughput, high spectral efficiency, thanks to SSB-DMT modulation.https://ieeexplore.ieee.org/document/11025546/Dual modulatorIM-DD systemsSSB signalsdiscrete multitone |
| spellingShingle | Stefano Gaiani Alberto Gatto Paola Parolari Pierpaolo Boffi Sustainable Transmitters for High-Capacity Metro-Access Networks IEEE Access Dual modulator IM-DD systems SSB signals discrete multitone |
| title | Sustainable Transmitters for High-Capacity Metro-Access Networks |
| title_full | Sustainable Transmitters for High-Capacity Metro-Access Networks |
| title_fullStr | Sustainable Transmitters for High-Capacity Metro-Access Networks |
| title_full_unstemmed | Sustainable Transmitters for High-Capacity Metro-Access Networks |
| title_short | Sustainable Transmitters for High-Capacity Metro-Access Networks |
| title_sort | sustainable transmitters for high capacity metro access networks |
| topic | Dual modulator IM-DD systems SSB signals discrete multitone |
| url | https://ieeexplore.ieee.org/document/11025546/ |
| work_keys_str_mv | AT stefanogaiani sustainabletransmittersforhighcapacitymetroaccessnetworks AT albertogatto sustainabletransmittersforhighcapacitymetroaccessnetworks AT paolaparolari sustainabletransmittersforhighcapacitymetroaccessnetworks AT pierpaoloboffi sustainabletransmittersforhighcapacitymetroaccessnetworks |