Ukulahleka kokugoba kwefayibha ibhekisa ekulahlekeni kwesiginali eyenzeka xa i-optical fiber igobile ngaphaya kwe-radius ethile. Le nto ibangelwa kukuvuza kokukhanya okuvela embindini we-fiber njengoko ihamba nge-cladding. Xa i-fiber igobile, i-light ray idlula kwi-total internal reflection kwi-core-cladding interface. Nangona kunjalo, ukuba i-radius egobileyo incinci kakhulu, eminye ye-light ray inokuphuma kwi-cladding, nto leyo ebangela ilahleko.

Ukulahleka kwe-fiber bend kuxhomekeke kwizinto ezininzi:

Irediyasi egobayo: Oku kungenxa yokuba i-radius encinci yokugoba ibangela ukuba imisebe yokukhanya ibe nokugoba okukhulu, nto leyo enyusa amathuba okuvuza ngaphakathi kwe-cladding.

Uhlobo lwefayibha: Iindidi ezahlukeneyo zeefayibha zineempawu ezahlukeneyo zokulahlekelwa kukugoba. Umzekelo, iifayibha zemowudi enye zihlala zinelahleko eziphantsi zokugoba xa kuthelekiswa neefayibha zemowudi ezininzi.

Ubude bamaza: Ukulahleka kokugoba kunokwahluka ngokwe-wavelength yokukhanya okudluliselwa ngefayibha. Amanye ama-wavelength anokufumana ukulahleka okuphezulu kokugoba kunezinye.

Uyilo lweFayibha: Uyilo lwefayibha, kuquka iprofayili yesalathisi sokukhanyela kunye nezinto ezisetyenzisiweyo, zinokuchaphazela ukulahleka kokugoba.

Ukwaleka: Uhlobo kunye nomgangatho wengubo esetyenziswa kwifayibha inokuchaphazela ukuguquguquka kwayo kunye nokumelana nokulahleka kokugoba.

Ukuze kuncitshiswe ukulahleka kokugoba, kubalulekile ukuphatha iifayibha ze-optical ngononophelo kwaye uphephe ukugoba okugqithisileyo, ingakumbi ukugoba okubukhali. Iintambo ze-fiber optic zihlala ziyilwa ngeeleya zokukhusela kunye nokuqinisa ukunciphisa ukulahleka kokugoba nokuqinisekisa ukudluliselwa okuthembekileyo kwemiqondiso.

Ekusetyenzisweni kwefayibha ye-optical, uhlobo oluntsonkothileyo lokulahleka kwe-optical kukulahleka kwe-micro-bending. Ngophuhliso lwezixhobo kunye neefayibha ze-optical, ukulahleka kwe-micro-bending yeyona nto ibangela ilahleko. Ukutshintsha kwe-optical ngokuthe ngqo kungeniswa kwisixhobo endaweni yokutshintsha ngombane, kwaye ifayibha ichaphazeleka kuxinzelelo lwexesha elide kwindawo encinci kakhulu. Kwifayibha, ifayibha encinci, ifayibha encinci yobubanzi, nokuba kukunciphisa ubukhulu bengubo, okanye ngokunciphisa ububanzi be-cladding; Ngokufanayo kwiifayibha ezininzi, ubukhulu be-cladding obusebenzayo buya kuncipha kakhulu, nto leyo eyandisa umngcipheko wokulahleka kwe-micro-bending.

Ukulahleka kwe-micro-bending kunye nokulahleka kwe-macro-bending kunxulumene nokugoba ngokoqobo, kodwa kukho umahluko ocacileyo phakathi kwazo ngokwembono yendlela yokwenzeka kokulahleka. Ke ngoko, kwizicelo ezisebenzayo, kubaluleke kakhulu ukwahlula ilahleko kwi-micro bend okanye i-macro bend ngokwendalo yokulahleka, okubandakanya indawo echanekileyo yengxaki kunye nendlela yokusombulula ingxaki.

1. Ngokuphathelele ukuguquguquka kwejiyometri

Ukulahleka kwe-micro-bending ngokwenene kukulahlekelwa okubangelwa kukuguquka okuncinci kwe-fiber, ngelixa ukulahleka kwe-macro-bending kukulahlekelwa okubangelwa kukugoba kokwenyani, kwaye ububanzi bangaphandle be-fiber buhlala buyinto egqibeleleyo. Oku kwenza umahluko ocacileyo kwi-geometry. Ukuguquguquka okuncinci kwe-fiber kunokuphathwa njengokuphazanyiswa kwe-high-frequency ye-geometric circumference kwicala elide le-fiber. Olu kuphazamiseka kuneempawu ezimbini: i-amplitude kunye ne-frequency. Indawo ye-micro-bend ivela kwi-frequency ephezulu kunye ne-amplitude ephantsi. Ukuphazamiseka kwangaphandle kunokulingiswa, kwaye i-frequency kunye ne-amplitude yayo itshintsha ngokungacwangciswanga ngokuhamba kwexesha. Ukuthatha i-Fourier transform yale random variable, ubukhulu bulingana namandla, kwaye kukho ukuhambelana okulinganayo phakathi koxinano lwamandla kunye ne-spatial frequency.

Oku kulula ukukuqonda ngokulula kwaye kufikelele kwisigqibo esifanelekileyo: xa i-frequency yokuphazamiseka iphezulu kakhulu, ukuguquguquka kwefayibha kuyafana, kwaye impembelelo yokulahleka kwe-micro-bending ayinkulu. Nangona kunjalo, xa i-frequency yokuphazamiseka iphantsi kakhulu, ukugoba kokwenyani kunokubakho, kwaye i-macro-bending loss inamandla.

2. Ukusuka kwindlela yokulahlekelwa

Kwilahleko yokugoba okukhulu, kunokucingelwa ukuba usasazo lwentsimi yemo yemo yesiseko (ifayibha yemo enye) kwifayibha luyasasazeka kwicala lokugoba, kwaye inxalenye esasazeka nzulu kwi-cladding iya kwenza imitha kwaye ilahleke kancinci kancinci. Kwilahleko yokugoba okuncinci, inxalenye yamandla emo yesiseko esasazeka kwifayibha efanelekileyo idityaniswe neendlela ezahlukeneyo zolandelelwano oluphezulu phantsi kwemeko yokuphazanyiswa. Njengoko umgama wokugoba usanda, amandla athwalwa zezi ndlela zolandelelwano oluphezulu aphuma kwifayibha ye-Oran ye-ten-element, kwaye ngokuqinisekileyo inokuphinda idityaniswe kwimo yesiseko.

Uhlalutyo lokulahleka kwe-micro-bending luhlala lusekelwe kwithiyori yokudibanisa imo, kwaye ubudlelwane obusisiseko buyinkimbinkimbi kancinci.

Apho u-C yi-coupling coofficient phakathi kwendlela esisiseko kunye nenye yeendlela eziphezulu, nto leyo ebonisa ukuba angakanani amandla aza kudityaniswa ukusuka kwimodi eqondisiweyo ukuya kwimodi ephezulu okanye imodi ye-cladding (imeko yendlela enye). I-Qfiber kukuphazamiseka kwefayibha phantsi koxinzelelo oluthe ngqo, kwaye i-Qenv kukuphazamiseka phantsi koxinzelelo olungathanga ngqo xa imeko itshintsha. Ukuchaneka kolu hlalutyo lomzekelo kunzima kuba ukuphazamiseka okubangela ukulahleka kwe-micro-bending kungaqhelekanga kakhulu, kodwa injongo yohlalutyo kukubonelela ngesikhokelo esomeleleyo, kwaye kwiimeko ezithile, ii-coefficients ezongezelelweyo zingasetyenziselwa ukulinganisa iziphumo zokulinganisa.

U-olshansky wafunda waza wacebisa ulwalamano lokuqwalasela kwasekuqaleni.

Irediyasi engundoqo

b - Irediyasi yokugquma

Umahluko we-Delta - refractive index

I-modulus ye-elastic ye-EE-polymer coating

Umzekelo -I-modulus ye-elastic yeglasi yefayibha ye-optical

Kwiimeko ezininzi zokusetyenziswa, olu lwalamano luluncedo ngakumbi

3. Umthombo wokulahleka kwe-micro-bending

Umthombo wokulahleka kokugoba okuncinci ikakhulu zizinto zangaphandle. Ukuba ifayibha isetyenziswa kuphela njengefayibha engenanto ngaphandle kokwenziwa kwentambo, ukuba akukho mandla angaphandle kwindawo ekhululekileyo, akukho nokwenzeka kokulahleka kokugoba okuncinci. Nangona ukungalungelelani kwejometri yefayibha ngokwayo kunokuba nokwenzeka kokulahleka kokugoba okuncinci, impembelelo yokulahleka kokugoba okuncinci kwefayibha ngokwayo inokungahoywa kuba uvavanyo lokulahleka ludluliwe kuvavanyo lwefektri. Iqwalasela kuphela impembelelo yokulahleka kokugoba okuncinci kwefayibha ekhanyayo ehambelana nokulungiswa kwangaphandle kwintambo ekhanyayo okanye isixhobo.

Imithombo yokulahleka kwe-micro-bending ikakhulu ivela kwiinkalo ezintathu

Eyokuqala luyilo lwefayibha ngokwayo. Uyilo lwefayibha ngokwayo alungomthombo wokulahleka kokugoba okuncinci, kodwa uvakalelo lokugoba okuncinci lumiselwa luyilo lwefayibha ngokwayo. Uyilo lwe-fiber core luphenjelelwa kakhulu lixabiso le-MAC. Oku kuhambelana nefomula ka-Olshansky.

Okukhona i-MAC incinci, kokukhona ilahleko yokugoba encinci iya kuba phantsi kokuphazamiseka okufanayo kwangaphandle.

Oku kubonakala kwifayibha ethile, ngokubanzi ifayibha ye-G657 ayinayo ilahleko yokugoba encinci kunefayibha ye-G652 ·

Nangona ukunciphisa i-core radius kunye nokwandisa umahluko we-refractive index kunokunciphisa ilahleko ye-micro-bending, ulwalamano phakathi kwee-fiber parameters kunye nokumiswa kwe-fiber akunakwenzeka ukuba kubekho kwimeko yokutshintsha i-parameter enye kuphela ngelixa ezinye zingatshintshi. Kodwa le ndlela iyaqhubeka.

Uyilo lwe-cladding kwi-fiber lunokubangela uphuculo. Ukuxhomekeka kwe-wavelength yokulahleka kwe-microbending kuyahluka kakhulu xa uyilo oluthile lwe-groove longezwa kwi-cladding.

Ukuxhomekeka kobude bexesha lokulahleka kwe-microbending ye-grooved fiber kumfanekiso kwahluke kakhulu kokwe-standard fiber. Ukuxhomekeka kobude bexesha lokukhanya kwe-standard fiber kulo mfanekiso kungaphaya kancinci kwedatha eqhelekileyo, ikakhulu kwi-grooved design fiber apho i-micro-bending loss yayo i-micro-bending loss ithambile. Oku kuthetha ukuba indawo yengxaki eqhelekileyo kunye nohlalutyo lwengxaki kufuneka kuqwalaselwe uyilo lwe-fiber, kungenjalo ngokusekelwe kumava nje kunokulahlekisa. Ngamafutshane, uyilo lwe-fiber luphucula i-micro-bending loss, eluncedo kwiimeko ezithile.

Okwesibini, umthombo wokulahleka kwe-micro-bending unxulumene ne-factor ye-optical fiber cable, eyinkimbinkimbi ngakumbi. Ubunzima bukwinyani yokuba kukho iintlobo ezininzi kakhulu ze-optical fiber cable kwaye uyilo lwahlukile kakhulu, kodwa kulula ukuba ngqo kuhlobo oluthile. Into eqhelekileyo yimpembelelo ye-coating. Ngokwengqiqo, kunokugqitywa kwelokuba i-coating, njengomgca wokuqala wokuzikhusela ukukhusela i-fiber, idlala indima yokuqhuba uxinzelelo olusebenzayo. Ukuba i-coating isetyenziswa njengomsebenzi wokudlulisa uxinzelelo, kokukhona i-internal elastic modulus incinci kwaye i-external elastic modulus inkulu, kokukhona ixabiso lomsebenzi wokudlulisa uxinzelelo lincinci, kwaye impembelelo ye-micro-bending loss ehambelanayo nayo incinci. Okukhona ububanzi be-coating bukhulu, kokukhona i-micro-bending loss incinci yaziwa ngabom.

Ngokucacileyo, ububanzi be-900um buncinci kakhulu kunokulahleka kwe-microbending ye-250um fiber. Kuyaziwa nokuba kuyilo olufanayo lwentambo ye-fiber optic, nangona indawo yokusebenza ye-900um fiber incinci, phantsi kweemeko eziqhelekileyo, ukulahleka kwayo kwe-micro-bending kuncinci kakhulu kwintambo.

Into yesithathu yimpembelelo yendawo ekuyo intambo. Ngenxa yobunzima bokulahleka kwe-micro-bending, akukho ndlela yovavanyo eqhelekileyo okwangoku, kwaye indlela yovavanyo ebonelelwe yi-IEC/TR62221 isetyenziswa ngokuthe ngqo. Kunzima ukufumanisa ukuphazamiseka. Kwanakwiindlela ezithile zovavanyo, iindawo zovavanyo kunye nezixhobo zovavanyo, iindawo ezahlukeneyo zokubeka zinokuba neziphumo ezahlukeneyo. Iziphumo zeelabhoratri ezahlukeneyo kunye neendlela ezahlukeneyo zovavanyo azinakuthelekiswa ngokuthe ngqo, kodwa zonke zithelekiso lomgangatho. Kwiziphumo zovavanyo, kufuneka ihlolwe ngokwahlukeneyo.