I ka ʻimi ʻana i ka mana kiʻekiʻe a me ka mamao o ka hoʻoili ʻana i nā ʻōnaehana kamaʻilio optical hou, ʻo ka walaʻau, ma ke ʻano he palena kino koʻikoʻi, ua kāohi mau i ka hoʻomaikaʻi ʻana i ka hana.
Ma kahi maʻamauEDFAʻōnaehana hoʻonui fiber doped erbium, hoʻopuka kēlā me kēia span hoʻoili optical ma kahi o 0.1dB o ka walaʻau hoʻokuʻu kūlohelohe i hōʻiliʻili ʻia (ASE), kahi i hoʻokumu ʻia i ke ʻano quantum random o ka pilina mālamalama/electron i ka wā o ke kaʻina hana hoʻonui.
Hōʻike ʻia kēia ʻano walaʻau ma ke ʻano he jitter timing level picosecond i loko o ka ʻāpana manawa. Wahi a ke kumu hoʻohālike jitter, ma lalo o ke kūlana o kahi coefficient dispersion o 30ps/(nm · km), piʻi ka jitter ma 12ps i ka wā e hoʻouna ana i 1000km. I loko o ka ʻāpana alapine (frequency), alakaʻi ia i ka emi ʻana o ka optical signal-to-noise ratio (OSNR), e hopena ana i ka nalowale o ka ʻike o 3.2dB (@ BER=1e-9) i loko o ka ʻōnaehana 40Gbps NRZ.
ʻO ka pilikia nui aʻe e hele mai ana mai ka hoʻopili ʻana o nā hopena nonlinear fiber a me ka dispersion - ʻo ke coefficient dispersion o ka fiber mode hoʻokahi maʻamau (G.652) ma ka puka makani 1550nm he 17ps/(nm · km), i hui pū ʻia me ka neʻe ʻana o ka pae nonlinear i hoʻokumu ʻia e ka modulation pae ponoʻī (SPM). Ke ʻoi aku ka mana hoʻokomo ma mua o 6dBm, e hoʻololi nui ka hopena SPM i ke ʻano nalu pulse.
Ma ka ʻōnaehana 960Gbps PDM-16QAM i hōʻike ʻia ma ke kiʻi ma luna, ʻo ka wehe ʻana o ka maka ma hope o ka hoʻoili ʻana o 200km he 82% o ka waiwai mua, a mālama ʻia ka kumu Q ma 14dB (e like me BER ≈ 3e-5); Ke hoʻolōʻihi ʻia ka mamao i 400km, ʻo ka hopena hui pū ʻia o ka modulation cross phase (XPM) a me ka hui ʻana o nā nalu ʻehā (FWM) e hoʻoulu ai i ka hāʻule ʻana o ke kekelē wehe maka i 63%, a ʻoi aku ka nui o ka hewa o ka ʻōnaehana ma mua o ka palena hoʻoponopono hewa FEC hoʻoholo paʻakikī o 10 ^ -12.
He mea kūpono ke hoʻomaopopo ʻana e ʻoi aku ka ʻino o ka hopena chirp alapine (frequency chirp) o ka laser modulation direct (DML) - ʻo ka waiwai alpha parameter (linewidth enhancement factor) o kahi laser DFB maʻamau aia ma ka pae o 3-6, a hiki i kona loli alapine koke ke hiki i ka ± 2.5GHz (e pili ana i ka parameter chirp C=2.5GHz/mA) ma ke au modulation o 1mA, e hopena ana i ka pulse broadening rate o 38% (cumulative dispersion D · L=1360ps/nm) ma hope o ka hoʻoili ʻana ma o kahi fiber 80km G.652.
ʻO ke kahawai crosstalk i nā ʻōnaehana wavelength division multiplexing (WDM) he mau keʻakeʻa hohonu. Ke lawe nei i ka hoʻokaʻawale ʻana o ke kahawai 50GHz ma ke ʻano he laʻana, ʻo ka mana hoʻopilikia i hoʻokumu ʻia e ka hui ʻana o nā nalu ʻehā (FWM) he lōʻihi kūpono Leff ma kahi o 22km i nā fiber optical maʻamau.
ʻO ke kahawai crosstalk i nā ʻōnaehana wavelength division multiplexing (WDM) he mau keʻakeʻa hohonu. Ke lawe nei i ka 50GHz channel spacing ma ke ʻano he laʻana, ʻo ka lōʻihi kūpono o ka mana hoʻopilikia i hana ʻia e ka hui ʻana o nā nalu ʻehā (FWM) ʻo Leff = 22km (e pili ana i ka fiber attenuation coefficient 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 (e pili ana i ka baseline -30dB), e koi ana i ka ʻōnaehana e hoʻonui i ka redundancy hoʻoponopono hewa mua (FEC) mai 7% a 20%. ʻO ka hopena hoʻoili mana i hoʻokumu ʻia e ka hoʻoulu ʻia ʻana o Raman scattering (SRS) e hopena i ka nalowale o kahi o 0.02dB no kēlā me kēia kilomita ma nā kahawai nalu lōʻihi, e alakaʻi ana i ka dip mana a hiki i ka 3.5dB ma ka ʻōnaehana C+L band (1530-1625nm). Pono ka uku hoʻēmi manawa maoli ma o kahi equalizer loaʻa dynamic (DGE).
Hiki ke helu ʻia ka palena hana o ka ʻōnaehana o kēia mau hopena kino i hui pū ʻia e ka huahana mamao bandwidth (B · L): ʻo ka B · L o kahi ʻōnaehana modulation NRZ maʻamau i loko o 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 hōʻailona i 280000 (Gb/s) · km (@ SD-FEC gain 9.5dB).
Ua hoʻokō ka fiber multiplexing (SDM) ʻoi loa o 7-core x 3-mode space division multiplexing (SDM) i ka hiki ke hoʻoili o 15.6Pb/s · km (ka hiki o ka fiber hoʻokahi o 1.53Pb/sx ka mamao hoʻoili o 10.2km) i nā wahi hoʻokolohua ma o ka mana palupalu o ka coupling intercore crosstalk control (<-40dB/km).
No ka hoʻokokoke ʻana i ka palena ʻo Shannon, pono nā ʻōnaehana hou e hoʻohana pū i ka hoʻohālikelike probabilidad (PS-256QAM, e hoʻokō ana i ka loaʻa ʻana o 0.8dB shaping), ka hoʻohālikelike ʻana o ka neural network (ua hoʻomaikaʻi ʻia ka pono o ka uku NL e 37%), a me nā ʻenehana hoʻonui Raman i hoʻolaha ʻia (DRA, ka pololei o ka piʻi ʻana o ka loaʻa ± 0.5dB) e hoʻonui i ka Q factor o ka hoʻoili ʻana o ka mea lawe hoʻokahi 400G PDM-64QAM e 2dB (mai 12dB a i 14dB), a hoʻomaha i ka hoʻomanawanui OSNR i 17.5dB/0.1nm (@ BER=2e-2).
Ka manawa hoʻouna: Iune-12-2025