{"id":35148,"date":"2019-10-31T22:02:35","date_gmt":"2019-10-31T19:02:35","guid":{"rendered":"https:\/\/prohoster.info\/blog\/seti-kabelnogo-televideniya-dlya-samyh-malenkih-chast-8-opticheskaya-magistralnaya-set\/"},"modified":"2019-10-31T22:02:35","modified_gmt":"2019-10-31T19:02:35","slug":"seti-kabelnogo-televideniya-dlya-samyh-malenkih-chast-8-opticheskaya-magistralnaya-set","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/novosti-interneta\/seti-kabelnogo-televideniya-dlya-samyh-malenkih-chast-8-opticheskaya-magistralnaya-set","title":{"rendered":"Kabeltelevisiooni v\u00f5rgud k\u00f5ige v\u00e4iksematele. Osa 8: Optiline selgroog","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><img decoding=\"async\" alt=\"Kabeltelevisiooni v\u00f5rgud k\u00f5ige v\u00e4iksematele. Osa 8: Optiline selgroog\" src=\"\/wp-content\/uploads\/1c4d747d25a95ae994d82fbd59e116a0.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nAastate jooksul on optiline keskkond andmete edastamise aluseks olnud. On raske ette kujutada, et keegi ei tunneks neid tehnoloogiaid, kuid minu artiklisari n\u00f5uab l\u00fchikest tutvustust.<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\n<b class=\"spoiler_title\">Artiklite seeria sisu<\/b><\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/449322\/\">Osa 1: Kaabli-TV v\u00f5rgu \u00fcldine arhitektuur<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/449902\/\">Osa 2: Signaali koostis ja vorm<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/450256\/\">Osa 3: Signaali analoogne komponent<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/450258\/\">Osa 4: Signaali digitaalne komponent<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/450278\/\">Osa 5: Koaksiaalne jaotamisv\u00f5rk<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/450452\/\">Osa 6: RF-signaali v\u00f5imendid<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/454542\/\">Osa 7: Optilised vastuv\u00f5tjad<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/455355\/\">Osa 8: Optiline peav\u00f5rk<\/a><\/noindex><\/li>\n<li>Osa 9: Peajaam<\/li>\n<li>Osa 10: Veaotsing ja t\u00f5rgete k\u00f5rvaldamine kaabli-TV v\u00f5rgus<\/li>\n<\/ul>\n<p>\nPildi t\u00e4iendamiseks selgitan m\u00f5ningaid p\u00f5hiasju lihtsas keeles (\u00e4rge visake kingi, see on neile, kes ei tea midagi): optiline kiud on klaas, mis on venitatud juukses ontsest \u00f5hemaks. Selle kaudu liigub laseriga loodud kiir, millel (nagu igal elektromagnetilisel lainel) on kindel sagedus. Mugavuse ja lihtsuse huvides r\u00e4\u00e4gitakse optikast tavaliselt sageduse asemel lainepikkusest, mida m\u00f5\u00f5detakse nanomeetrites. Kaabeltelevisiooni signaalide edastamiseks kasutatakse tavaliselt \u03bb=1550nm.<\/p>\n<p>Peamised osad \u00fchendatakse omavahel keevitamise v\u00f5i pistikute abil. Selle kohta saab rohkem lugeda <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/193146\/\">suurep\u00e4rasest artiklist @stalinets<\/a><\/noindex>. \u00dctlen vaid, et KTV v\u00f5rkudes kasutatakse peaaegu alati kaldpindade poleerimist APC. <\/p>\n<p><img decoding=\"async\" alt=\"Kabeltelevisiooni v\u00f5rgud k\u00f5ige v\u00e4iksematele. Osa 8: Optiline selgroog\" src=\"\/wp-content\/uploads\/5d3dadf9f154a8a937721a5547df78c6.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>Pilt saidilt fiber-optic-solutions.com<\/i><\/p>\n<p>See refleksioonide s\u00fcnkroonsus, kuigi see tekitab veidi rohkem vaibumist kui sirge, omab v\u00e4ga olulist omadust: peegeldatud signaal levib s\u00f5lmpunktis mitte sama telje kaudu kui p\u00f5hjakas signaal, mille t\u00f5ttu m\u00f5jutab see v\u00e4hem. Digitaalsete edastusv\u00f5rkude puhul, kus on sisseehitatud liig, ei tundu see olulise, kuid analoogsisignaalil, sealhulgas kiudoptikas, on see v\u00e4ga kriitiline: k\u00f5ik m\u00e4letavad kahekordistumist v\u00f5i pildi libisemist vanadel telesaatjail ebakindla vastuv\u00f5tu korral. Sarnased lainefenomeenid, nii \u00f5hus kui ka juhtmetes, on t\u00f5epoolest olemas. Kuigi digitaalne telesignaal on ohu t\u00f5ttu suurem, puuduvad tal siiski paljud pakettandmete edastuse eelised ning see v\u00f5ib samuti f\u00fc\u00fcsikalise tasandi t\u00f5ttu kahjustuda, kuid mitte enam taastada taastamise p\u00e4ringute kaudu.<\/p>\n<p>Selleks, et signaali saaks edastada pika vahemaa taha, on vajalik selle k\u00f5rge tase, seet\u00f5ttu ei saa ahelas loobuda v\u00f5imendajatest. Optilist signaali kaabeltelevisiooni (KTV) s\u00fcsteemides v\u00f5imendavad erbiumi v\u00f5imendid (EDFA). Selle seadme t\u00f6\u00f6 on suurep\u00e4rane n\u00e4ide sellest, et iga piisavalt arenenud tehnoloogia ei eristu maagia eest. L\u00fchidalt \u00f6eldes: kui kiir kulgeb erbiummooduliga kiududes, luuakse tingimused, kus iga algse kiirguse foton loob kaks oma klooni. Selliseid seadmeid kasutatakse k\u00f5ikides andmeedastuss\u00fcsteemides pika vahemaa taha. Need ei ole muidugi odavad. Seet\u00f5ttu juhtudel, kui signaali suurendamine ei ole olulisel m\u00e4\u00e4ral vajalik ja ei ole rangeid n\u00f5udeid m\u00fcra osas, kasutatakse signaaliregeneraatoreid:<\/p>\n<p><img decoding=\"async\" alt=\"Kabeltelevisiooni v\u00f5rgud k\u00f5ige v\u00e4iksematele. Osa 8: Optiline selgroog\" src=\"\/wp-content\/uploads\/629f8aa97d6a0a00ceb8b044d5bdc033.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSee seade, nagu n\u00e4ha struktuurskeemilt, teostab signaali kahetise muundamise optilise ja elektrilise keskkonna vahel. Selline konstruktsioon v\u00f5imaldab vajadusel muundada signaali lainepikkust.<\/p>\n<p>Selliseid toiminguid nagu signaali tugevdamine ja regeneratsioon on vajalik mitte ainult kaabli kilomeetrilise kadu kompenseerimiseks. Suurimad kaod toimuvad signaali jagamisel v\u00f5rgu harude vahel. Jagamine toimub passiivsete seadmete abil, millel v\u00f5ib vastavalt vajadusele olla erinev arv harusid ning ka signaali jagamine v\u00f5ib toimuda nii s\u00fcmmeetriliselt kui mitte.<\/p>\n<p><img decoding=\"async\" alt=\"Kabeltelevisiooni v\u00f5rgud k\u00f5ige v\u00e4iksematele. Osa 8: Optiline selgroog\" src=\"\/wp-content\/uploads\/e1b3b0cc2513d8ae8377090a4410d67d.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nJagaja sees on kas kiud, mis on \u00fchendatud k\u00fclgpindadega, v\u00f5i on see s\u00f6\u00f6vitatud nagu teed tr\u00fckiplaadil. S\u00fcvendi s\u00fcvendamiseks soovitan artikleid <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/users\/nagru\/\" class=\"user_link\">NAGru<\/a><\/noindex> r\u00e4\u00e4kinud <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/nag\/blog\/408963\/\">keevitatud<\/a><\/noindex> ja <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/nag\/blog\/371203\/\">planar<\/a><\/noindex> jagajad vastavalt. Mida rohkem harusid jagajal on, seda suuremad on selle p\u00f5hjustatud kadud signaalis.<\/p>\n<p>Kui lisada jagajale filtrid erineva lainepikkusega kiirte jagamiseks, saame edastada samaaegselt kaks signaali \u00fches kiududes.<\/p>\n<p><img decoding=\"async\" alt=\"Kabeltelevisiooni v\u00f5rgud k\u00f5ige v\u00e4iksematele. Osa 8: Optiline selgroog\" src=\"\/wp-content\/uploads\/8532a92e861978723ce0a7bb0906346b.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSee on lihtsaim optilise mitmekihistamise versioon \u2014 FWDM. \u00dchendades TV ja Express seadmed KTV ja interneti vastavalt, saame segasignaali \u00fchises COM-v\u00e4ljas, mida saab edastada \u00fche kiu kaudu, ning teisel pool jagada seda optilise vastuv\u00f5tja ja l\u00fcliti vahel, n\u00e4iteks. See toimub umbes sama moodi, nagu klaasprismas valgest valgusest ilmub vikerkaar.<\/p>\n<p>Optilise signaali varustamiseks v\u00f5ivad lisaks kahe sisendiga optilistele vastuv\u00f5tjatele, millest ma r\u00e4\u00e4kisin <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/454542\/\">eelmisel korral<\/a><\/noindex> kasutada elektromehaanilist releed, mis saab signaaliparametrite j\u00e4rgi \u00fchest allikast teisele vahetada.<br \/>\nKui \u00fcks kiud laguneb, vahetab seade automaatselt teise peale. Vahetusaeg on alla sekundi, seega n\u00e4ib see kasutajale halvas olukorras nagu hulk artefakte digitaalses telesignaalis, mis kaovad kohe j\u00e4rgmise kaadriga.<br \/>\n<br \/>Allikas: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/455355\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412\u043e\u0442 \u0443\u0436\u0435 \u043c\u043d\u043e\u0433\u043e \u043b\u0435\u0442 \u043e\u0441\u043d\u043e\u0432\u043e\u0439 \u043f\u0435\u0440\u0435\u0434\u0430\u0447\u0438 \u0434\u0430\u043d\u043d\u044b\u0445 \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u043e\u043f\u0442\u0438\u0447\u0435\u0441\u043a\u0430\u044f \u0441\u0440\u0435\u0434\u0430. \u0421\u043b\u043e\u0436\u043d\u043e \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u0438\u0442\u044c \u0445\u0430\u0431\u0440\u0430\u0447\u0438\u0442\u0430\u0442\u0435\u043b\u044f, \u043d\u0435 \u0437\u043d\u0430\u043a\u043e\u043c\u043e\u0433\u043e \u0441 \u044d\u0442\u0438\u043c\u0438 \u0442\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u044f\u043c\u0438, \u043e\u0434\u043d\u0430\u043a\u043e \u0431\u0435\u0437 \u0445\u043e\u0442\u044f \u0431\u044b \u043a\u0440\u0430\u0442\u043a\u043e\u0433\u043e \u043e\u043f\u0438\u0441\u0430\u043d\u0438\u044f \u043e\u0431\u043e\u0439\u0442\u0438\u0441\u044c \u0432 \u043c\u043e\u0435\u0439 \u0441\u0435\u0440\u0438\u0438 \u0441\u0442\u0430\u0442\u0435\u0439 \u043d\u0435\u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e. \u0421\u043e\u0434\u0435\u0440\u0436\u0430\u043d\u0438\u0435 \u0441\u0435\u0440\u0438\u0438 \u0441\u0442\u0430\u0442\u0435\u0439 \u0427\u0430\u0441\u0442\u044c 1: \u041e\u0431\u0449\u0430\u044f \u0430\u0440\u0445\u0438\u0442\u0435\u043a\u0442\u0443\u0440\u0430 \u0441\u0435\u0442\u0438 \u041a\u0422\u0412 \u0427\u0430\u0441\u0442\u044c 2: \u0421\u043e\u0441\u0442\u0430\u0432 \u0438 \u0444\u043e\u0440\u043c\u0430 \u0441\u0438\u0433\u043d\u0430\u043b\u0430 \u0427\u0430\u0441\u0442\u044c 3: \u0410\u043d\u0430\u043b\u043e\u0433\u043e\u0432\u0430\u044f \u0441\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u044e\u0449\u0430\u044f \u0441\u0438\u0433\u043d\u0430\u043b\u0430 \u0427\u0430\u0441\u0442\u044c 4: \u0426\u0438\u0444\u0440\u043e\u0432\u0430\u044f \u0441\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u044e\u0449\u0430\u044f \u0441\u0438\u0433\u043d\u0430\u043b\u0430 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-35148","post","type-post","status-publish","format-standard","hentry","category-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.0.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0412\u043e\u0442 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