Ho na le limaraka tse 5 tsa fiber ea multimode: OM1, OM2, OM3, OM4, 'me joale OM5. Hantle-ntle ke eng e etsang hore li fapane?
Sebakeng sa mantlha (tšoarela pun), se arolang limaraka tsena tsa fiber ke boholo ba tsona ba mantlha, li-transmitters, le bokhoni ba bandwidth.
Likhoele tsa Optical multimode (OM) li na le mokokotlo oa 50 µm (OM2-OM5) kapa 62.5 µm (OM1). Mokotla o moholo o bolela hore mefuta e mengata ea khanya e tsamaea bohareng ka nako e le 'ngoe, kahoo e bitsoa "multimode."
Lifaele tsa Lefa
Habohlokoa, boholo ba mantlha ba OM1's 62.5 µm bo bolela hore ha e tsamaellane le limaraka tse ling tsa multimode 'me e ke ke ea amohela likhokahanyo tse tšoanang. Kaha OM1 le OM2 ka bobeli li ka ba le lijase tsa ka ntle tsa lamunu (ho ea ka litekanyetso tsa TIA/EIA), kamehla hlahloba tšōmo e hatisitsoeng thapong ho netefatsa hore u sebelisa lihokelo tse nepahetseng.
Likhoele tsa pele tsa OM1 le OM2 li ne li etselitsoe ho sebelisoa le mehloli ea LED kapa li-transmitters. Meeli ea ho feto-fetoha ha li-LED le eona e ile ea fokotsa bokhoni ba OM1 le OM2 ea pele.
Leha ho le joalo, tlhoko e ntseng e eketseha ea lebelo e ne e bolela hore likhoele tsa optical li hloka bokhoni bo phahameng ba bandwidth. Kenya li-laser-optimized multimode fibers (LOMMF):OM2, OM3 le OM4, 'me joale OM5.
Laser-optimization
Lithapo tsa OM2, OM3, OM4, le OM5 li etselitsoe ho sebetsa ka li-laser tsa vertical-cavity surface-emitting lasers (VCSELs), ka kakaretso ho 850 nm. Kajeno, laser-optimized OM2 (joalo ka ea rona) le eona e fumaneha habonolo. Li-VCSEL li lumella ho feto-fetoha ha maemo ka potlako ho feta li-LED, ho bolelang hore likhoele tse ntlafalitsoeng ka laser li ka fetisa lintlha tse ngata haholo.
Ho latela maemo a indasteri, OM3 e na le modal bandwidth (EMB) e sebetsang ea 2000 MHz*km ho 850 nm. OM4 e khona ho sebetsana le 4700 MHz* km.
Mabapi le boitsebahatso, OM2 e boloka baki ea lamunu, joalo ka ha ho boletsoe ka holimo. OM3 le OM4 ka bobeli li ka ba le baki ea kantle ea aqua (sena ke 'nete ka lithapo tsa patch tsa Cleerline OM3 le OM4). OM4 e ka hlaha ka baki ea kantle ea "Erika violet". Haeba u kena thapong e khanyang ea magenta fiber optic, mohlomong ke OM4. Ka thabo, OM2, OM3, OM4, le OM5 kaofela ke likhoele tsa 50/125 µm 'me kaofela li ka amohela likhokahanyo tse tšoanang. Leha ho le joalo, hlokomela hore mebala ea sehokelo ea fapana. Lihokelo tse ling tsa multimode li kanna tsa tšoauoa joalo ka "optimized for OM3/OM4 fiber" mme e tla ba aqua e mebala. Lihokelo tse tloaelehileng tsa laser-optimized multimode li ka ba beige kapa tse ntšo. Haeba ho na le pherekano, ka kopo sheba lintlha tsa sehokelo ka ho khetheha mabapi le boholo ba mantlha. Ho bapisa boholo ba mantlha ke tšobotsi ea bohlokoa ka ho fetisisa bakeng sa lihokelo tsa mochini, kaha e netefatsa hore lets'oao le tla boloka ts'ebetso ka sehokelo.
Nako ea poso: Aug-01-2022