Pre-Filtering Techniques for Spectrum Narrowing Caused by Optical Node Traversal in Ultra-Dense WDM Networks
To improve the spectral efficiency and increase network capacity, wavelength signals must be multiplexed densely, i.e., ultra-dense wavelength-division-multiplexing (WDM) networks. However, the spectrum of each WDM signal is narrowed by the wavelength-selective switches placed in optical nodes, so t...
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IEEE
2021-01-01
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| Series: | IEEE Photonics Journal |
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| Online Access: | https://ieeexplore.ieee.org/document/9376592/ |
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| author | Kazuya Okamura Yojiro Mori Hiroshi Hasegawa |
| author_facet | Kazuya Okamura Yojiro Mori Hiroshi Hasegawa |
| author_sort | Kazuya Okamura |
| collection | DOAJ |
| description | To improve the spectral efficiency and increase network capacity, wavelength signals must be multiplexed densely, i.e., ultra-dense wavelength-division-multiplexing (WDM) networks. However, the spectrum of each WDM signal is narrowed by the wavelength-selective switches placed in optical nodes, so the transmissible distance and node hop count of the signal are strictly limited. To counter this spectrum narrowing problem caused by optical node traversal in ultra-dense WDM networks, pre-filtering techniques have been proposed. This paper comprehensively investigates the performance of four pre-filtering techniques: conventional Nyquist filtering, pre-emphasis filtering, partial-response filtering, and the combination of pre-emphasis and partial-response filtering. We conduct extensive computer simulations and discuss the optimality of pre-filtering techniques. The simulation results show that the adaptive use of pre-filtering can substantially extend the maximum attainable transmission distance and hop counts of 4/16/64-QAM signals. |
| format | Article |
| id | doaj-art-c38f90035fe7449e87e8889ffe2d8fff |
| institution | Matheson Library |
| issn | 1943-0655 |
| language | English |
| publishDate | 2021-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Photonics Journal |
| spelling | doaj-art-c38f90035fe7449e87e8889ffe2d8fff2025-07-01T23:54:18ZengIEEEIEEE Photonics Journal1943-06552021-01-0113211310.1109/JPHOT.2021.30651399376592Pre-Filtering Techniques for Spectrum Narrowing Caused by Optical Node Traversal in Ultra-Dense WDM NetworksKazuya Okamura0Yojiro Mori1https://orcid.org/0000-0002-7800-5843Hiroshi Hasegawa2Department of Information and Communication Engineering, Nagoya University, Nagoya, JapanDepartment of Information and Communication Engineering, Nagoya University, Nagoya, JapanDepartment of Information and Communication Engineering, Nagoya University, Nagoya, JapanTo improve the spectral efficiency and increase network capacity, wavelength signals must be multiplexed densely, i.e., ultra-dense wavelength-division-multiplexing (WDM) networks. However, the spectrum of each WDM signal is narrowed by the wavelength-selective switches placed in optical nodes, so the transmissible distance and node hop count of the signal are strictly limited. To counter this spectrum narrowing problem caused by optical node traversal in ultra-dense WDM networks, pre-filtering techniques have been proposed. This paper comprehensively investigates the performance of four pre-filtering techniques: conventional Nyquist filtering, pre-emphasis filtering, partial-response filtering, and the combination of pre-emphasis and partial-response filtering. We conduct extensive computer simulations and discuss the optimality of pre-filtering techniques. The simulation results show that the adaptive use of pre-filtering can substantially extend the maximum attainable transmission distance and hop counts of 4/16/64-QAM signals.https://ieeexplore.ieee.org/document/9376592/Photonic networkoptical nodehigher-order modulationdigital coherent system |
| spellingShingle | Kazuya Okamura Yojiro Mori Hiroshi Hasegawa Pre-Filtering Techniques for Spectrum Narrowing Caused by Optical Node Traversal in Ultra-Dense WDM Networks IEEE Photonics Journal Photonic network optical node higher-order modulation digital coherent system |
| title | Pre-Filtering Techniques for Spectrum Narrowing Caused by Optical Node Traversal in Ultra-Dense WDM Networks |
| title_full | Pre-Filtering Techniques for Spectrum Narrowing Caused by Optical Node Traversal in Ultra-Dense WDM Networks |
| title_fullStr | Pre-Filtering Techniques for Spectrum Narrowing Caused by Optical Node Traversal in Ultra-Dense WDM Networks |
| title_full_unstemmed | Pre-Filtering Techniques for Spectrum Narrowing Caused by Optical Node Traversal in Ultra-Dense WDM Networks |
| title_short | Pre-Filtering Techniques for Spectrum Narrowing Caused by Optical Node Traversal in Ultra-Dense WDM Networks |
| title_sort | pre filtering techniques for spectrum narrowing caused by optical node traversal in ultra dense wdm networks |
| topic | Photonic network optical node higher-order modulation digital coherent system |
| url | https://ieeexplore.ieee.org/document/9376592/ |
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