Kodi njira yopambana ya Shannon pamakina opatsira optical ndi iti?

Kodi njira yopambana ya Shannon pamakina opatsira optical ndi iti?

Pofunafuna mphamvu zapamwamba komanso mtunda wautali wotumizirana maulumikizidwe amakono, phokoso, monga cholepheretsa chachikulu cha thupi, nthawi zonse limalepheretsa kusintha kwa ntchito.

Mu wambaEDFAerbium-doped fiber amplifier system, nthawi iliyonse yotulutsa kuwala imapanga pafupifupi 0.1dB ya phokoso lodziphatikizira lokhalokha (ASE), lomwe limachokera ku kuchuluka kwachisawawa kwa kuwala / ma elekitironi panthawi yokulitsa.

Phokoso lamtunduwu limawonekera ngati picosecond level time jitter mu nthawi yanthawi. Malinga ndi kulosera kwachitsanzo cha jitter, pansi pa chikhalidwe cha coefficient ya 30ps/(nm · km), jitter imawonjezeka ndi 12ps potumiza 1000km. M'magawo afupipafupi, zimayambitsa kuchepa kwa chiwerengero cha optical-to-noise ratio (OSNR), zomwe zimapangitsa kuti 3.2dB iwonongeke (@ BER = 1e-9) mu 40Gbps NRZ system.

Vuto lalikulu kwambiri limachokera ku kuphatikizika kwamphamvu kwa zotsatira za fiber zopanda malire ndi kubalalitsidwa - kufalikira kwa coefficient ya ochiritsira single-mode fiber (G.652) muwindo la 1550nm ndi 17ps / (nm · km), kuphatikizapo kusintha kwa gawo lopanda mzere chifukwa cha self phase modulation (SPM). Mphamvu yolowera ikadutsa 6dBm, zotsatira za SPM zidzasokoneza kwambiri mawonekedwe a pulse waveform.

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Mu dongosolo la 960Gbps PDM-16QAM lomwe likuwonetsedwa mu chithunzi pamwambapa, kutsegula kwa diso pambuyo pa kutumiza kwa 200km ndi 82% ya mtengo woyamba, ndipo Q factor imasungidwa pa 14dB (yogwirizana ndi BER ≈ 3e-5); Pamene mtunda ukuwonjezeka ku 400km, zotsatira ophatikizana wa mtanda gawo modulation (XPM) ndi zinayi mafunde kusakaniza (FWM) kuchititsa diso kutsegula digiri kugwa kwambiri ku 63%, ndi dongosolo zolakwa mlingo kuposa zovuta kusankha FEC zolakwa malire malire a 10 ^ -12.

Ndizofunikira kudziwa kuti kugunda kwafupipafupi kwa laser modulation laser (DML) kudzaipiraipira - mtengo wa alpha (linewidth enhancement factor) wa laser wamba wa DFB uli pakati pa 3-6, ndipo kusintha kwake kwakanthawi kochepa kumatha kufika ± 2.5GHz (mogwirizana ndi chirp parameter C = 2.5 GHz / mA pampul yapano) kuchuluka kwa 38% (cumulative dispersion D · L=1360ps/nm) pambuyo pa kufalikira kudzera mu 80km G.652 fiber.

Ma Channel crosstalk mumayendedwe a wavelength division multiplexing (WDM) amakhala ndi zopinga zakuya. Kutengera mtunda wa 50GHz monga chitsanzo, mphamvu yosokoneza yomwe imayambitsidwa ndi kusakanikirana kwa mafunde anayi (FWM) ili ndi kutalika kwa Leff pafupifupi 22km mu ulusi wamba wamba.

Ma Channel crosstalk mumayendedwe a wavelength division multiplexing (WDM) amakhala ndi zopinga zakuya. Kutengera mtunda wa 50GHz monga mwachitsanzo, kutalika kokwanira kwa mphamvu yosokoneza yopangidwa ndi kusakanikirana kwa mafunde anayi (FWM) ndi Leff = 22km (yogwirizana ndi fiber attenuation coefficient α=0.22 dB/km).

Pamene mphamvu yowonjezera ikuwonjezeka mpaka + 15dBm, mlingo wa crosstalk pakati pa mayendedwe oyandikana nawo ukuwonjezeka ndi 7dB (yogwirizana ndi -30dB baseline), kukakamiza dongosolo kuonjezera kuwongolera zolakwika (FEC) redundancy kuchokera ku 7% mpaka 20%. Mphamvu zotengera mphamvu zomwe zimachitika chifukwa cha kusonkhezereka kwa Raman scattering (SRS) kumapangitsa kutayika kwa pafupifupi 0.02dB pa kilomita imodzi munjira zazitali zakutali, zomwe zimatsogolera ku kuviika kwamphamvu mpaka 3.5dB mu C+L band (1530-1625nm). Malipiro a nthawi yeniyeni amafunikira kudzera mu dynamic gain equalizer (DGE).

Malire a machitidwe a machitidwe a thupi awa ophatikizidwa akhoza kuwerengedwa ndi bandwidth mtunda wa mankhwala (B · L): B · L ya machitidwe amtundu wa NRZ mu G.655 fiber (dispersion compensated fiber) pafupifupi 18000 (Gb / s) · km, pamene ndi PDM-QPSK kusinthasintha ndi teknoloji yodziwika bwino yodziwira, chizindikiro ichi chikhoza kukhala 0 (G2b / 8 km) SD-FEC ipeza 9.5dB).

The kudula-m'mphepete 7-pachimake x 3-mode space division multiplexing CHIKWANGWANI (SDM) akwaniritsa mphamvu kufala kwa 15.6Pb/s · Km (umodzi CHIKWANGWANI mphamvu ya 1.53Pb/sx kufala mtunda wa 10.2km) mu malo labotale kudzera ofooka kugwirizana inter core crosstalk control (<-40d).

Kuti muyandikire malire a Shannon, makina amakono akuyenera kutengera kusinthika kwa kuthekera (PS-256QAM, kukwaniritsa phindu lopanga 0.8dB), neural network equalization (NL compensation performance yakonzedwa ndi 37%), ndikugawa Raman amplification (DRA, kupeza kulondola kotsetsereka ± 0.5dB) kukulitsa ukadaulo umodzi wa Q400 Kutumiza kwa PDM-64QAM ndi 2dB (kuchokera ku 12dB mpaka 14dB), ndikupumula kulolerana kwa OSNR ku 17.5dB/0.1nm (@ BER=2e-2).


Nthawi yotumiza: Jun-12-2025

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