Design and evaluation of quasi-Nyquist WDM networks utilizing widely deployed wavelength-selective switches
| Autor: | Yojiro Mori, Hiroshi Hasegawa, Ken-ichi Sato, Ryuta Shiraki |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Network architecture
business.industry Computer science Bandwidth (signal processing) 02 engineering and technology Spectral efficiency 021001 nanoscience & nanotechnology 01 natural sciences Atomic and Molecular Physics and Optics 010309 optics Wavelength Optics Transmission (telecommunications) Wavelength-division multiplexing 0103 physical sciences Electronic engineering Photonics 0210 nano-technology business Passband Digital filter |
| Zdroj: | Optics express. 27(13) |
| ISSN: | 1094-4087 |
| Popis: | Photonic networks based on wavelength-selective switches (WSSs) can transport wavelength-division-multiplexed (WDM) signals in a cost-effective manner. To accommodate the ever-increasing network traffic, the spectral efficiency should be maximized by minimizing the bandwidth of the guardbands inserted between WDM signals. Quasi-Nyquist WDM systems are seen as offering the highest spectral efficiency in a feasible way. However, highly dense WDM systems suffer from the signal-spectrum narrowing induced by the non-rectangular passbands of WSSs. Furthermore, widely deployed WSSs cannot process quasi-Nyquist WDM signals since the signal-alignment granularity does not match the passband resolution of the WSSs. This paper proposes a network architecture that enables quasi-Nyquist WDM networking with widely deployed WSSs. Through intensive network analyses based on computer simulations, we confirm that it has 30.8% higher spectral efficiency than conventional networks. Its feasibility is verified by transmission experiments on 72-channel 32-Gbaud/400-Gbps dual-carrier dual-polarization 16-ary quadrature-amplitude-modulation signals aligned with 66.6-GHz spacing in the full C-band. The net fiber capacity of 28.8 Tbps, the transmission distance of 900 km, and the hop count of 9 are attained by our proposed quasi-Nyquist WDM networking scheme. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|