Ha ho ntse ho lelekisa matla a holimo le sebaka se selelele sa phetisetso litsamaisong tsa sejoale-joale tsa puisano tsa optical, lerata, joalo ka thibelo ea mantlha ea 'mele, esale le thibela ntlafatso ea ts'ebetso.
Ka mokhoa o tloaelehilengEDFASistimi ea amplifier ea erbium-doped fiber, nako e 'ngoe le e' ngoe ea phetisetso ea optical e hlahisa hoo e ka bang 0.1dB ea lerata le bokelletsoeng la "spontaneous emission" (ASE), le thehiloeng ho sebopeho se sa reroang sa tšebelisano ea leseli / elektronike nakong ea ts'ebetso ea ho holisa.
Mofuta ona oa lerata o bonahala e le jitter ea nako ea boemo ba picosecond sebakeng sa nako. Ho ea ka ponelopele ea mohlala oa jitter, tlas'a boemo ba coefficient ea ho qhalakanngoa ea 30ps/(nm · km), jitter e eketseha ka 12ps ha e fetisetsa 1000km. Sebakeng sa maqhubu, e lebisa ho fokotseha ha tekanyo ea optical-to-noise ratio (OSNR), e bakang tahlehelo ea kutloisiso ea 3.2dB (@ BER = 1e-9) tsamaisong ea 40Gbps NRZ.
Phephetso e matla le ho feta e tsoa ho ho kopanya ho matla ha fiber nonlinear effects le dispersion - dispersion coefficient of common single-mode fiber (G.652) fensetereng ea 1550nm ke 17ps / (nm · km), e kopantsoe le phetoho e sa tloaelehang ea mohato e bakoang ke ho ikamahanya le maemo (SPM). Ha matla a ho kenya a feta 6dBm, phello ea SPM e tla senya haholo sebopeho sa maqhubu a pulse.
Lenaneong la 960Gbps PDM-16QAM le bontšitsoeng setšoantšong se ka holimo, ho bula mahlo ka mor'a phetisetso ea 200km ke 82% ea bohlokoa ba pele, 'me ntlha ea Q e bolokiloe 14dB (e lumellanang le BER ≈ 3e-5); Ha sebaka se fetisetsoa ho 400km, phello e kopantsoeng ea cross phase modulation (XPM) le ho kopanya maqhubu a mane (FWM) ho etsa hore tekanyo ea ho bula mahlo e theohe haholo ho 63%, 'me tekanyo ea phoso ea tsamaiso e feta qeto e boima ea FEC moeli oa tokiso ea phoso ea 10 ^ -12.
Ho bohlokoa ho hlokomela hore frequency chirp effect ea direct modulation laser (DML) e tla mpefala - alpha parameter (linewidth enhanced factor) boleng ba laser e tloaelehileng ea DFB e boemong ba 3-6, 'me phetoho ea eona ea hang-hang e ka fihla ± 2.5GHz (e tsamaellanang le chirp parameter C = 2.5GHz modulation ea hona joale ea modulation ea GHz / mA) ho atolosa sekhahla sa 38% (cumulative dispersion D · L=1360ps/nm) ka mor'a phetiso ka 80km G.652 fiber.
Channel crosstalk in wavelength division multiplexing system (WDM) e na le litšitiso tse tebileng. Ho nka sebaka sa sebaka sa 50GHz e le mohlala, matla a sitiso a bakoang ke ho kopanya maqhubu a mane (FWM) a na le Leff e sebetsang ea bolelele ba 22km ka likhoele tse tloaelehileng tsa optical.
Channel crosstalk in wavelength division multiplexing system (WDM) e na le litšitiso tse tebileng. Ho nka sebaka sa 50GHz channel e le mohlala, bolelele bo sebetsang ba matla a tšitiso a hlahisoang ke ho kopanya maqhubu a mane (FWM) ke Leff = 22km (e tsamaellanang le coefficient ea fiber attenuation α = 0.22 dB / km).
Ha matla a ho kenya a ntse a eketseha ho ea ho + 15dBm, boemo ba crosstalk pakeng tsa liteishene tse haufi bo eketseha ka 7dB (e amanang le motheo oa -30dB), e qobella tsamaiso ho eketsa phoso ea ho lokisa phoso (FEC) ho tloha ho 7% ho ea ho 20%. Tšusumetso ea phetisetso ea matla e bakoang ke ho hasana ha Raman (SRS) e fella ka tahlehelo ea hoo e ka bang 0.02dB khilomithara ho likanale tse telele tsa maqhubu, e lebisang ho theolelo ea matla ho fihla ho 3.5dB tsamaisong ea C+L (1530-1625nm). Ho hlokahala matšeliso a nako ea 'nete ka sekhahla sa dynamic gain equalizer (DGE).
Moeli oa ts'ebetso ea tsamaiso ea liphello tsena tsa 'mele o kopantsoeng o ka lekanyetsoa ka sehlahisoa sa sebaka sa marang-rang (B · L): B · L ea mokhoa o tloaelehileng oa ho feto-fetoha ha NRZ ho G.655 fiber (dispersion compensated fiber) hoo e ka bang 18000 (Gb / s) · km, ha ho ntse ho e-na le mokhoa oa ho feto-fetoha oa PDM-QPSK le theknoloji e lumellanang ea ho lemoha, ho 0 (GG 80 km2) e ka ntlafatsoa ho 0 (GG 8 km) SD-FEC fumana 9.5dB).
The cut-edge 7-core x 3-mode space division multiplexing fiber (SDM) e fihletse matla a phetisetso ea 15.6Pb / s · km (mokhoa o le mong oa fiber ea 1.53Pb / sx sebaka sa phetisetso ea 10.2km) libakeng tsa laboratori ka ho kopanya ho fokolang inter core crosstalk control (<-40d).
Ho atamela moeli oa Shannon, litsamaiso tsa sejoale-joale li hloka ho amohela ka kopanelo sebopeho sa monyetla (PS-256QAM, ho fihlela phaello ea sebopeho sa 0.8dB), neural network equalization (katleho ea puseletso ea NL e ntlafalitsoe ka 37%), le ho ajoa ha Raman amplification (DRA, ho fumana ho nepahala ha moepa ± 0.5dB) ho eketsa theknoloji e le 'ngoe ea Q400 Phetiso ea PDM-64QAM ka 2dB (ho tloha 12dB ho ea 14dB), 'me u phomotse mamello ea OSNR ho 17.5dB/0.1nm (@ BER=2e-2).
Nako ea poso: Jun-12-2025