Hauv kev nrhiav kom muaj peev xwm ntau dua thiab kev sib kis ntev dua hauv kev sib txuas lus kho qhov muag niaj hnub no, lub suab nrov, raws li kev txwv lub cev tseem ceeb, yeej ib txwm txwv kev txhim kho kev ua haujlwm.
Hauv ib txwmEDFAerbium-doped fiber ntau amplifier system, txhua qhov kev sib kis ntawm qhov muag tau tsim kwv yees li 0.1dB ntawm cov suab nrov nrov nrov (ASE), uas yog hauv paus hauv quantum random xwm ntawm lub teeb / hluav taws xob kev sib cuam tshuam thaum lub sij hawm amplification txheej txheem.
Hom suab nrov no manifests li picosecond theem lub sij hawm jitter nyob rau hauv lub sij hawm sau. Raws li kev twv ua qauv jitter, nyob rau hauv cov xwm txheej ntawm qhov sib txawv ntawm qhov sib txawv ntawm 30ps / (nm · km), lub jitter nce 12ps thaum kis 1000km. Nyob rau hauv qhov zaus, nws ua rau txo qis hauv qhov sib piv ntawm cov teeb liab-rau- suab nrov (OSNR), uas ua rau muaj qhov tsis txaus ntseeg ntawm 3.2dB (@ BER = 1e-9) hauv 40Gbps NRZ system.
Qhov kev sib tw hnyav dua los ntawm kev sib txuas ntawm fiber ntau nonlinear cuam tshuam thiab dispersion - dispersion coefficient ntawm cov pa ib hom fiber ntau (G.652) nyob rau hauv 1550nm qhov rais yog 17ps/(nm · km), ua ke nrog lub nonlinear theem hloov los ntawm tus kheej theem kev hloov kho (SPM). Thaum lub zog tawm tswv yim tshaj 6dBm, cov nyhuv SPM yuav cuam tshuam cov mem tes waveform.
Nyob rau hauv 960Gbps PDM-16QAM system qhia nyob rau hauv daim duab saum toj no, qhov muag qhib tom qab 200km kis tau tus mob yog 82% ntawm tus nqi pib, thiab Q yam yog khaws cia ntawm 14dB (xws li BER ≈ 3e-5); Thaum qhov kev ncua deb mus rau 400km, qhov sib xyaw ua ke ntawm kev hloov pauv theem (XPM) thiab plaub lub nthwv dej sib xyaw (FWM) ua rau lub qhov muag qhib qhov muag poob qis mus rau 63%, thiab qhov kev ua yuam kev ntawm qhov system tau dhau qhov kev txiav txim siab nyuaj FEC kev kho qhov kev txwv ntawm 10 ^ -12.
Nws yog ib nqi sau cia hais tias qhov zaus chirp nyhuv ntawm ncaj qha modulation laser (DML) yuav phem - lub alpha parameter (linewidth li qhov zoo tshaj plaws) tus nqi ntawm ib tug raug DFB laser yog nyob rau hauv ntau ntawm 3-6, thiab nws instantaneous zaus hloov tau mus txog ± 2.5GHz (suav nrog chirp parameter 1 / 2.5 GHz tam sim no ntawm a GHz. pulse broadening tus nqi ntawm 38% (sau dispersion D · L = 1360ps / nm) tom qab kis tau tus mob los ntawm ib tug 80km G.652 fiber.
Channel crosstalk nyob rau hauv wavelength division multiplexing (WDM) systems ua rau cov teeb meem tob. Noj 50GHz channel sib nrug ua piv txwv, lub zog cuam tshuam los ntawm plaub yoj sib xyaw (FWM) muaj qhov ntev Leff ntawm li 22km hauv cov fibers zoo tib yam.
Channel crosstalk nyob rau hauv wavelength division multiplexing (WDM) systems ua rau cov teeb meem tob. Siv lub 50GHz channel sib nrug ua piv txwv, qhov ntev ntawm kev cuam tshuam lub zog tsim los ntawm plaub nthwv dej sib xyaw (FWM) yog Leff = 22km (suav nrog fiber ntau attenuation coefficient α = 0.22 dB / km).
Thaum lub zog tawm tswv yim tau nce mus rau + 15dBm, theem crosstalk ntawm cov kab uas nyob ib sab nce los ntawm 7dB (kwv yees rau -30dB hauv paus), yuam kom lub kaw lus nce qhov kev ua yuam kev tom ntej (FEC) rov ua dua los ntawm 7% mus rau 20%. Lub zog hloov hluav taws xob tshwm sim los ntawm kev txhawb nqa Raman tawg (SRS) ua rau poob ntawm kwv yees li 0.02dB ib kilometer nyob rau hauv qhov ntev wavelength raws, ua rau lub zog poob mus txog 3.5dB hauv C + L band (1530-1625nm) system. Kev them nyiaj nqes hav tiag tiag ntawm lub sijhawm yuav tsum tau los ntawm dynamic nce equalizer (DGE).
Lub kaw lus kev txwv ntawm cov teebmeem ntawm lub cev ua ke tuaj yeem suav tau los ntawm cov khoom siv bandwidth (B·L): B · L ntawm ib qho kev hloov kho NRZ hauv G.655 fiber ntau (dispersion compensated fiber) yog kwv yees li 18000 (Gb / s) · km, thaum nrog PDM-QPSK kev hloov kho thiab kev sib koom ua ke tshawb pom tshuab, qhov ntsuas no tuaj yeem txhim kho 0 · 08 (@G. SD-FEC nce 9.5dB).
Qhov kev txiav-ntug 7-core x 3-hom chaw faib multiplexing fiber (SDM) tau ua tiav qhov kev sib kis ntawm 15.6Pb / s · km (ib leeg fiber ntau muaj peev xwm ntawm 1.53Pb / sx kis tau tus mob ntawm 10.2km) hauv cov chaw kuaj mob los ntawm kev sib txuas tsis muaj zog inter core crosstalk tswj (<-40dB).
Txhawm rau kom ncav cuag Shannon txwv, cov tshuab niaj hnub no yuav tsum tau sib koom ua ke siv qhov ua tau zoo (PS-256QAM, ua tiav 0.8dB shaping nce), neural network sib npaug (NL cov nyiaj tau txais txiaj ntsig zoo dua los ntawm 37%), thiab faib Raman amplification (DRA, nce qhov tseeb nqes hav ± 0.5dB) Qeb 4 ntawm ib qho khoom siv hluav taws xob. PDM-64QAM kis tau los ntawm 2dB (los ntawm 12dB mus rau 14dB), thiab so lub OSNR kam rau ua 17.5dB / 0.1nm (@ BER = 2e-2).
Post lub sij hawm: Jun-12-2025