I ka ʻimi ʻana i ka mana kiʻekiʻe a me ka lōʻihi o ka hoʻouna ʻana i nā ʻōnaehana kamaʻilio optical hou, ʻo ka walaʻau, ma ke ʻano he palena koʻikoʻi, ua kāohi mau i ka hoʻomaikaʻi ʻana i ka hana.
Ma kahi maʻamauEDFAErbium-doped fiber amplifier system, kēlā me kēia optical transmission span e hoʻopuka ma kahi o 0.1dB o ka leo hoʻokuʻu kūʻokoʻa (ASE), i hoʻokumu ʻia i ke ʻano kuʻuna o ka hui kukui / uila i ka wā o ke kaʻina hana hoʻonui.
Hōʻike ʻia kēia ʻano walaʻau ma ke ʻano he picosecond level timing jitter ma ke kikowaena manawa. Wahi a ka wānana kŘkohu jitter, ma lalo o ke kūlana o ka dispersion coefficient o 30ps/(nm · km), piʻi ka jitter ma 12ps i ka wā e hoʻouna ana i 1000km. Ma ka ʻaoʻao alapine, alakaʻi ia i ka emi ʻana o ka optical signal-to-noise ratio (OSNR), ka hopena i ka nalowale o ka sensitivity o 3.2dB (@ BER=1e-9) i ka ʻōnaehana 40Gbps NRZ.
ʻO ka hoʻokūkū koʻikoʻi mai ka hoʻohui ikaika ʻana o nā hopena nonlinear a me ka hoʻopuehu - ʻo ka dispersion coefficient o ka fiber mode hoʻokahi (G.652) ma ka pukaaniani 1550nm he 17ps/(nm · km), i hui pū ʻia me ka hoʻololi ʻana o ke ʻano nonlinear i hoʻokumu ʻia e ka hoʻololi ʻana i ka manawa ponoʻī (SPM). Ke ʻoi aku ka mana hoʻokomo ma mua o 6dBm, e hoʻololi loa ka hopena SPM i ka nalu pulse.
Ma ka 960Gbps PDM-16QAM pūnaewele i hōʻikeʻia ma ka helu i luna nei,ʻo ka weheʻana o ka maka ma hope o ka laweʻana o 200km he 82% o ka waiwai mua, a mālamaʻia ka helu Q ma 14dB (e like me BER ≈ 3e-5); Ke hoʻolōʻihi ʻia ka lōʻihi i 400km, ʻo ka hopena hui ʻana o ka hoʻololi ʻana i ke ʻano o ke keʻa (XPM) a me ka hui ʻana o ka nalu ʻehā (FWM) ke kumu e hāʻule nui ai ka wehe ʻana o ka maka i 63%, a ʻoi aku ka nui o ka hewa o ka ʻōnaehana i ka palena hoʻoponopono hewa FEC o 10 ^ -12.
Pono e hoʻomaopopo ʻia e ʻoi aku ka nui o ka hopena chirp o ka laser modulation pololei (DML) - ʻo ka alpha parameter (linewidth enhancement factor) ka waiwai o kahi laser DFB maʻamau i loko o ka laulā o 3-6, a hiki i kona hoʻololi koke ʻana ke hiki i ± 2.5GHz (e like me ka chirp parameter C=2.5GHz/mA) ma kahi modulation rate o 1m3% o ka hopena o ka pulsecumula 1mA. hoʻopuehu D · L=1360ps/nm) ma hope o ka hoʻoili ʻia ʻana ma o kahi fiber 80km G.652.
ʻO nā ʻōnaehana hoʻopaʻa ʻana i ka hawewe ma waena o nā puʻupuʻu hawewe (WDM) he mau pilikia hohonu. Ke lawe nei i ka spacing channel 50GHz ma ke ʻano he laʻana, ʻo ka mana interference i hoʻokumu ʻia e ka hui ʻana o nā nalu ʻehā (FWM) he Leff lōʻihi kūpono ma kahi o 22km i nā fiber optical maʻamau.
ʻO nā ʻōnaehana hoʻopaʻa ʻana i ka hawewe ma waena o nā puʻupuʻu hawewe (WDM) he mau pilikia hohonu. Ke lawe nei i ka 50GHz channel spacing ma ke ʻano he laʻana, ʻo ka lōʻihi kūpono o ka mana interference i hana ʻia e ka hui ʻana o nā nalu ʻehā (FWM) ʻo Leff=22km (e pili ana i ka coefficient attenuation fiber α=0.22 dB/km).
Ke hoʻonui ʻia ka mana hoʻokomo i +15dBm, piʻi ka pae crosstalk ma waena o nā kahawai pili e 7dB (pili i ka baseline -30dB), e koi ana i ka ʻōnaehana e hoʻonui i ka hoʻoponopono hewa mua (FEC) redundancy mai 7% a 20%. ʻO ka hopena o ka hoʻololi ʻana i ka mana ma muli o ka hoʻoulu ʻia ʻana o Raman scattering (SRS) ka hopena i ka nalowale ma kahi o 0.02dB i kēlā me kēia kilomika ma nā kaha hawewe lōʻihi, e alakaʻi ana i ka hoʻokuʻu mana a hiki i 3.5dB i ka ʻōnaehana C+L (1530-1625nm). Pono ka uku slope manawa maoli ma o ka dynamic gain equalizer (DGE).
Hiki ke helu ʻia ka palena hana ʻōnaehana o kēia mau hopena kino i hui ʻia e ka huahana mamao bandwidth (B · L): ʻo ka B · L o kahi ʻōnaehana modulation NRZ maʻamau i ka fiber G.655 (dispersion compensated fiber) ma kahi o 18000 (Gb / s) · km, ʻoiai me ka modulation PDM-QPSK a me ka ʻenehana ʻike coherent, hiki ke hoʻomaikaʻi ʻia kēia hōʻailona2 / 0 (0 km) Loaʻa iā SD-FEC 9.5dB).
ʻO ka ʻokiʻoki 7-core x 3-mode space division multiplexing fiber (SDM) ua loaʻa i ka hiki ke hoʻouna ʻia o 15.6Pb/s · km (ka mana fiber hoʻokahi o 1.53Pb/sx ka mamao o ka hoʻouna ʻana o 10.2km) ma nā kaiapuni keʻena ma o ka hoʻopili nāwaliwali ʻana i ka mana crosstalk core (<-40dB/km).
No ka hoʻokokoke ʻana i ka palena ʻo Shannon, pono nā ʻōnaehana hou e hoʻohui like i ka hoʻohālikelike ʻana i ka probability shaping (PS-256QAM, ka loaʻa ʻana o 0.8dB shaping gain), neural network equalization (NL compensation efficiency i hoʻomaikaʻi ʻia e 37%), a hāʻawi ʻia i ka Raman amplification (DRA, loaʻa ka slope slope ± 0.5dB) ʻenehana Q4 o ka mea lawe lawe hoʻokahi PDM-6 2dB (mai ka 12dB a hiki i ka 14dB), a hoʻomaha i ka hoʻomanawanui OSNR i 17.5dB/0.1nm (@ BER=2e-2).
Ka manawa hoʻouna: Iune-12-2025