E rima ngā momo muka maha-aratau: OM1, OM2, OM3, OM4, ā, inaianei ko OM5. He aha te mea e rerekē ai rātou?
I te pūtake (mōhio mai te kupu whakakatakata), ko te mea e wehewehe ana i ēnei momo muka ko ō rātou rahi matua, ngā tuku, me ngā āheinga whānui.
Ko te matua o ngā muka whatu maha-aratau (OM) he 50 µm (OM2-OM5) 62.5 µm rānei (OM1). Ko te tikanga o te matua nui ake ka haere ngā momo mārama maha i te matua i te wā kotahi, koia te ingoa "multimode".
Ngā muka tawhito
He mea nui, ko te rahi matua 62.5 µm o OM1 te tikanga kāore e hototahi ki ētahi atu momo aratau maha, ā, kāore e taea te whakaae ki ngā hononga ōrite. Nā te mea ka taea e OM1 me OM2 te whai i ngā koti o waho karaka (e ai ki ngā paerewa TIA/EIA), tirohia tonu te tohu tā i runga i te taura kia mōhio ai kei te whakamahi koe i ngā hononga tika.
I hangaia ngā muka OM1 me OM2 o mua hei whakamahi me ngā pūtake LED, ngā tuku rānei. Waihoki, nā ngā herenga whakarerekētanga o ngā LED i whakawhāiti i ngā āheinga o OM1 me OM2 o mua.
Heoi, nā te pikinga ake o te hiahia mō te tere, i nui ake ai ngā āheinga whānui o ngā muka whatu. Ka uru mai ngā muka aratau maha kua arotauhia ki te taiaho (LOMMF): OM2, OM3 me OM4, ā, ināianei ko OM5.
Arotau-Reias
Kua hangaia ngā muka OM2, OM3, OM4, me OM5 kia mahi tahi me ngā taiaho whakaputa mata-poutū (VCSEL), i te nuinga o te wā i te 850 nm. I ēnei rā, kei te wātea hoki ngā OM2 kua arotauhia ki te taiaho (pēnei i tā mātou). Ka taea e ngā VCSEL te tere ake i ngā tere whakarerekētanga i ngā LED, ko te tikanga ka taea e ngā muka kua arotauhia ki te taiaho te tuku raraunga nui ake.
E ai ki ngā paerewa ahumahi, ko te whānuitanga o te whānuitanga o te OM3 (EMB) he 2000 MHz*km i te 850 nm. Ka taea e OM4 te whakahaere i te 4700 MHz*km.
Mō te tautuhi, kei te pupuri tonu a OM2 i te koti karaka, e ai ki te kōrero i runga ake nei. Ka taea e OM3 me OM4 te whai koti o waho wai (he pono tēnei mō ngā taura papaki Cleerline OM3 me OM4). Ka taea hoki e OM4 te puta me te koti o waho "Erika papura". Mena ka tūtaki koe ki tētahi taura muka whatu magenta kanapa, ko OM4 pea. He waimarie, ko OM2, OM3, OM4, me OM5 he muka 50/125 µm katoa, ā, ka taea e rātou katoa te whakaae ki ngā hononga kotahi. Heoi, kia mahara he rerekē ngā waehere tae hononga. Ka tohua pea ētahi hononga maha-aratau hei "kua arotauhia mō te muka OM3/OM4" ā, ka tae wai. Ka taea e ngā hononga maha-aratau kua arotauhia e te laser paerewa te parauri, te mangu rānei. Mena he pōhēhētanga, tirohia te whakatakotoranga hononga mō te rahi matua. Ko te taurite i te rahi matua te āhuatanga tino nui mō ngā hononga miihini, nā te mea ka whakarite kia mau tonu te haere tonu o te tohu mā te hononga.
Wā tuku: 01 o Ākuhata-2022