TY - JOUR
T1 - GMPLS/PCE control of flexi-grid DWDM optical networks using CO-OFDM transmission [Invited]
AU - Casellas, Ramon
AU - Muñoz, Raül
AU - Fàbrega, Josep M.
AU - Moreolo, Michela Svaluto
AU - Martínez, Ricardo
AU - Liu, Lei
AU - Tsuritani, Takehiro
AU - Morita, Itsuro
N1 - Funding Information:
Work partially funded by the Spanish Ministry of Economy and Competitiveness through the project DORADO (TEC2009-07995) and the grant PTQ-11-04805 and by the European Community’s Seventh Framework Programme FP7/2007-2013 through the IP STRONGEST program under grant agreement 247674. The authors would like to thank the members of the IETF CCAMP working group and the ITU-T involved in the standardization of flexi-grid for their comments and insights.
PY - 2012
Y1 - 2012
N2 - Current optical transport networks use optical channel carriers (wavelengths) that are defined and constrained by a fixed ITU-T dense wavelength division multiplexing (DWDM) grid. Such a grid is not adapted to high data rates (beyond 100 Gb/s) and is inefficient when a wavelength is assigned to a low-rate optical signal. Consequently, the ITU-T is updating the set of DWDM reference frequencies with the inclusion of a smaller channel spacing (e.g., 6.25 GHz) while allowing the allocation of frequency slots, that is, variable-sized frequency ranges composed of a number of slices. In this paper, we propose the design, implementation, and experimental validation of a Generalized Multi-Protocol Label Switching/path computation element (GMPLS/PCE) control plane for such flexible optical networks, using optical orthogonal frequency division multiplexing transmission technology, given its unique flexibility, bit-rate/bandwidth scalability, and subwavelength granularity. The control plane uses a distance-adaptive and PCE-based routing and modulation assignment, combined with distributed frequency slot (spectrum) selection. A comparative analysis of path computation algorithms is carried out, highlighting the benefits of extending the path computation function with the knowledge of the status of the slices and the spectral efficiency of the modulation formats.
AB - Current optical transport networks use optical channel carriers (wavelengths) that are defined and constrained by a fixed ITU-T dense wavelength division multiplexing (DWDM) grid. Such a grid is not adapted to high data rates (beyond 100 Gb/s) and is inefficient when a wavelength is assigned to a low-rate optical signal. Consequently, the ITU-T is updating the set of DWDM reference frequencies with the inclusion of a smaller channel spacing (e.g., 6.25 GHz) while allowing the allocation of frequency slots, that is, variable-sized frequency ranges composed of a number of slices. In this paper, we propose the design, implementation, and experimental validation of a Generalized Multi-Protocol Label Switching/path computation element (GMPLS/PCE) control plane for such flexible optical networks, using optical orthogonal frequency division multiplexing transmission technology, given its unique flexibility, bit-rate/bandwidth scalability, and subwavelength granularity. The control plane uses a distance-adaptive and PCE-based routing and modulation assignment, combined with distributed frequency slot (spectrum) selection. A comparative analysis of path computation algorithms is carried out, highlighting the benefits of extending the path computation function with the knowledge of the status of the slices and the spectral efficiency of the modulation formats.
KW - CO-OFDM
KW - Control plane for flexi-grid DWDM networks
KW - Elastic optical networks
KW - GMPLS/PCE
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U2 - 10.1364/JOCN.4.0000B1
DO - 10.1364/JOCN.4.0000B1
M3 - Article
AN - SCOPUS:84870521745
SN - 1943-0620
VL - 4
SP - B1-B10
JO - Journal of Optical Communications and Networking
JF - Journal of Optical Communications and Networking
IS - 11
M1 - 6360163
ER -