Sub-Nyquist field trial using time frequency packed DP-QPSK super-channel within fixed ITU-T grid
| Autor: | Luca Giorgi, Fabio Cavaliere, S. Hackett, Francesco Fresi, Marco Secondini, Gianluca Berrettini, A. Petronio, R. Forgan, A. Leong, C. Pfander, Gianluca Meloni, Tommaso Foggi, Luca Poti, P. Nibbs, R. Masciulli |
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| Rok vydání: | 2015 |
| Předmět: |
Signal processing
Computer science business.industry Loopback FOS: Physical sciences Atomic and Molecular Physics and Optics Time–frequency analysis Optics Polarization mode dispersion Modulation Electronic engineering Nyquist–Shannon sampling theorem Super-channel business Decoding methods Physics - Optics Optics (physics.optics) Phase-shift keying |
| Zdroj: | Optics Express. 23:16196 |
| ISSN: | 1094-4087 |
| DOI: | 10.1364/oe.23.016196 |
| Popis: | Sub-Nyquist time frequency packing technique was demonstrated for the first time in a super-channel field trial transmission over long-haul distances. The technique allows a limited spectral occupancy even with low order modulation formats. The transmission was successfully performed on a deployed Australian link between Sydney and Melbourne which included 995 km of uncompensated SMF with coexistent traffic. 40 and 100 Gb/s co-propagating channels were transmitted together with the super-channel in a 50 GHz ITU-T grid without additional penalty. The super-channel consisted of eight sub-channels with low-level modulation format, i.e. DP-QPSK, guaranteeing better OSNR robustness and reduced complexity with respect to higher order formats. At the receiver side, coherent detection was used together with iterative maximum-a-posteriori (MAP) detection and decoding. A 975 Gb/s DP-QPSK super-channel was successfully transmitted between Sydney and Melbourne within four 50GHz WSS channels (200 GHz). A maximum potential SE of 5.58 bit/s/Hz was achieved with an OSNR = 15.8 dB, comparable to the OSNR of the installed 100 Gb/s channels. The system reliability was proven through long term measurements. In addition, by closing the link in a loop back configuration, a potential SE∙d product of 9254 bit/s/Hz·km was achieved. |
| Databáze: | OpenAIRE |
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