Kurasikirwa kwekukotama kwefiber zvinoreva kurasikirwa kwechiratidzo chinoitika kana fiber ye optical yakakombama kupfuura radius yakati. Chiitiko ichi chinokonzerwa nekubuda kwechiedza kubva pakati pe fiber painofamba nepakati pe cladding. Kana fiber yakakombama, mwaranzi yechiedza inopinda mukati me core-cladding interface. Zvisinei, kana radius yakakombama iri diki zvakanyanya, mamwe maranzi echiedza anogona kubuda nepakati pe cladding, zvichikonzera kurasikirwa.

Kurasikirwa kwe fiber kunoenderana nezvinhu zvakawanda:

Nharaunda Inokombama: Kana dhayamita yekukombama iri diki, kurasikirwa kwekukombama kwacho kwakakwira. Izvi zvinodaro nekuti dhayamita diki yekukombama inoita kuti mwaranzi yechiedza ione kukombama kukuru, zvichiwedzera mukana wekubuda kwemvura kuburikidza necladding.

Rudzi rweFaibha: Mhando dzakasiyana dzemafiber dzine hunhu hwakasiyana hwekurasikirwa nekukotama. Semuenzaniso, mafiber emodhi imwe chete anowanzova nekurasikirwa kwakaderera kwekukotama zvichienzaniswa nemafiber emodhi yakawanda.

Kureba kwemafungu: Kurasikirwa kwekukombama kunogona kusiyana zvichienderana nehurefu hwechiedza chinopfuudzwa kuburikidza nefaibha. Mamwe marefu emwenje anogona kurasikirwa nekukombama kwakanyanya kupfuura mamwe.

Dhizaini yeFiber: Magadzirirwo efaibha, kusanganisira chimiro che refractive index uye zvinhu zvinoshandiswa, zvinogona kukanganisa kurasikirwa kwekukombama.

Kupfeka: Rudzi uye mhando yependi inoshandiswa pafaibha zvinogona kukanganisa kuchinjika kwayo uye kuramba kwayo kukanganiswa nekukotama.

Kuti uderedze kukotama, zvakakosha kubata mafiber e optical nokungwarira uye kudzivirira kukotama zvakanyanya, kunyanya kukotama kwakapinza. Tambo dze fiber optic dzinowanzogadzirwa nezvikamu zvekudzivirira uye zvinosimbisa kuti zvideredze kukotama uye kuve nechokwadi chekuti masaini anotumirwa zvakanaka.

Mukushandiswa kwefiber ye optical, rudzi rwakaoma rwekurasikirwa kwe optical i micro-bending loss. Nekugadzirwa kwemidziyo nema fiber e optical, kurasikirwa kwe micro-bending chinhu chinonyanya kukanganiswa. Kuchinja kwakananga kwe optical kunounzwa mumudziyo panzvimbo pekuchinja kwemagetsi, uye fiber inogona kushushikana kwenguva refu munzvimbo diki. Kune fiber, fiber yakatetepa, fiber diki ye dhayamita, kungave nekuderedza ukobvu hwe coating, kana nekuderedza dhayamita ye cladding; Saizvozvowo kune multi-core fibers, ukobvu hwe cladding hunoshanda huchaderedzwawo zvakanyanya, izvo zvinowedzera njodzi yekurasikirwa kwe micro-bending.

Kurasikirwa ne micro-bending uye kurasikirwa ne macro-bending zvine chekuita nekukotama chaiko, asi pane musiyano uri pachena pakati pazvo kubva pakuona kwemaitiro ekurasikirwa. Saka, mukushanda, zvakakosha zvikuru kusiyanisa kurasikirwa kubva kune micro bend kana macro bend zvichienderana nemhando yekurasikirwa, iyo inosanganisira nzvimbo chaiyo yedambudziko uye nzira yekugadzirisa dambudziko.

1. Panyaya yekuchinja kwejometri

Kurasikirwa kwe micro-bending chaizvoizvo kurasikirwa kunounzwa nekushanduka kudiki kwe fiber, nepo kurasikirwa kwe macro-bending kuri kurasikirwa kunounzwa nekukombama chaiko, uye dhayamita yekunze ye fiber inoramba iri iyo yakajairika. Izvi zvinoita mutsauko wakajeka mu geometry. Kushanduka kudiki kwe fiber kunogona kutorwa se high-frequency perturbation ye geometric circumference munzira refu ye fiber. Kukanganiswa uku kune zvinhu zviviri: amplitude uye frequency. Nzvimbo ye micro-bend inobva ku high frequency uye low amplitude. Kukanganiswa kwekunze kunogona kutevedzera, uye frequency yayo uye amplitude zvinoshanduka zvisina tsarukano nekufamba kwenguva. Tichitora Fourier transform yekuchinja uku kusina tsarukano, hukuru hwakaenzana nesimba, uye pane correspondence inoenderana pakati pe power spectral density uye spatial frequency.

Izvi zviri nyore kunzwisisa uye zvinopa mhedziso yemhando yepamusoro: kana frequency yekukanganiswa yakakwira zvakanyanya, kushanduka kwefiber kwakafanana, uye simba rekurasikirwa nekukotama kwe micro-bending harisi rakakura. Zvisinei, kana frequency yekukanganiswa yakaderera zvikuru, kukotama chaiko kunogona kuumbwa, uye kurasikirwa kwekukotama kwe macro ndiko kwakanyanya.

2. Kubva panzira yekurasikirwa

Mukurasikirwa kwe macro-bending, zvinogona kufungwa kuti kugoverwa kwemode field kwe fundamental mode (single-mode fiber) mu fiber kunopararira kudivi rekukotama, uye chikamu chinopararira mukati me cladding chichagadzira radiation uye chinorasikirwa zvishoma nezvishoma. Mukurasikirwa kwe micro-bending, chikamu chesimba re fundamental mode rinopararira mu fiber yakanaka rinosanganiswa ne higher-order modes dzakasiyana pasi pemamiriro ekuvhiringidzika. Sezvo daro rekuparadzira richikwira, simba rinotakurwa ne higher-order modes idzi rinobuda mu Oran ten-element fiber, uye zvechokwadi rinogona kudzoserwa ku fundamental mode.

Kuongororwa kwekurasikirwa kwe micro-bending kunowanzo enderana nedzidziso yekubatanidza maitiro, uye hukama hwacho hwakaoma zvishoma.

Apo C iri coupling coefficient pakati pe fundamental mode neimwe ye higher-order modes, iyo inoratidza kuti simba rakawanda sei richabatanidzwa kubva ku guided mode kuenda ku higher-order mode kana cladding mode (single-mode scenario). Qfiber idambudziko re fiber pasi pekumanikidzwa kwakananga, uye Qenv idambudziko pasi pekumanikidzwa kwakananga kana nharaunda ikachinja. Kururama kwekuongorora uku kwemodeling kwakaoma nekuti kuvhiringidzika kunokonzera kurasikirwa kwe micro-bending kwakawanda zvisina kurongeka, asi chinangwa chekuongorora ndechekupa gwara rakasimba, uye mune mamwe mamiriro ezvinhu, mamwe ma coefficients anogona kushandiswa kufungidzira mhedzisiro ye simulation.

olshansky akadzidza uye akataura nezvehukama hwekucherechedza pakutanga.

a -Nharaunda yepakati

b - Nharaunda yekuvhara

Musiyano weDelta - refractive index

Modulus yepurasitiki yeEE-polymer coating

Semuenzaniso -Elastic modulus yegirazi re optical fiber

Panyaya dzekushandiswa kwakawanda, hukama uhwu hunobatsira zvikuru

3. Kunobva kurasikirwa kwe micro-bend

Chinhu chinokonzera kurasikirwa kwe micro-bend ndicho chinhu chinobva kunze. Kana fiber ikangoshandiswa se fiber isina chinhu isina kugadzirwa netambo, kana pasina simba rekunze munzvimbo yakasununguka, hapana mukana wekurasikirwa kwe micro-bend. Kunyangwe kusarongeka kwe geometric ye fiber pachayo kungave nemukana wekurasikirwa kwe micro-bend, simba rekurasikirwa kwe micro-bend ye fiber pachayo rinogona kufuratirwa nekuti bvunzo yekurasikirwa yakapasiswa mukuedzwa kwefekitori. Inongotarisa chete simba rekurasikirwa kwe micro-bend ye optical fiber inoenderana nekugadzika kwekunze mu optical cable kana mudziyo.

Manyuko ekurasikirwa kwema micro-bend anonyanya kubva pazvinhu zvitatu

Chekutanga idhizaini yefaibha pachayo. Dhizaini yefaibha pachayo haisiyo inokonzera kurasikirwa nekukotama kwe micro-bending, asi kunzwa kwekukotama kwe micro-bending kunotsanangurwa nedhizaini yefaibha pachayo. Dhizaini yefaibha core inonyanya kukanganiswa neMAC value. Izvi zvinoenderana nechimiro chaOlshansky.

Kana MAC iri diki, kurasikirwa kwe micro-bending kuchava kudiki pasi pekukanganiswa kwekunze kwakafanana.

Izvi zvinoratidzwa mufayibha chaiyo, kazhinji fayibha yeG657 ine kurasikirwa kushoma kwekukotama kupfuura fayibha yeG652 ·

Kunyangwe kuderedza core radius uye kuwedzera musiyano we refractive index kunogona kuderedza kurasikirwa kwe micro-bending, hukama huripo pakati pe fiber parameters uye standardization ye fiber hazvigoneke kuvapo kana paine shanduko ye parameter imwe chete asi dzimwe dzisina kuchinja. Asi maitiro acho ari kuenderera mberi.

Magadzirirwo ejira remukati mefaibha anogonawo kuunza kuvandudzwa. Kuenderana kwehurefu hwewavelength nekurasikirwa kwe microbending kunosiyana zvakanyanya kana dhizaini chaiyo ye groove yakawedzerwa kujira remukati.

Kuenderana kwehurefu hwemafungu ekurasikirwa kwefiber yakakombama mumufananidzo kwakasiyana zvikuru nekwe fiber yakajairwa. Kuenderana kwehurefu hwefiber yakakombama mumufananidzo uyu kuri kupfuura data renguva dzose, kunyanya kune fiber yakagadzirwa ne grooved ine kurasikirwa kwe micro-bending kwakatsetseka. Izvi zvinoreva kuti nzvimbo yedambudziko yakajairika uye kuongorora dambudziko kunofanirwa kufunga nezve dhizaini yefiber, zvikasadaro kungobva pane zvakaitika kunogona kutsausa. Mukupfupisa, dhizaini yefiber inogadzirisa kurasikirwa kwe micro-bending, izvo zvinobatsira kune mamwe mamiriro ezvinhu.

Chechipiri, chikonzero chekurasikirwa ne micro-bending chakabatana ne factor ye optical fiber cable, iyo yakaoma zvikuru. Kuoma kwacho kuri pakuti kune mhando dzakawanda dze optical fiber cable uye dhizaini yacho yakasiyana zvikuru, asi zviri nyore kutaura zvakananga kune imwe mhando. Chinhu chinowanzo shandiswa ipesvedzero ye coating. Nekunzwisisa, zvinogonawo kugumiswa kuti coating, senzira yekutanga yekudzivirira kuchengetedza fiber, inoita basa rekufambisa kushushikana zvinobudirira. Kana coating ikashandiswa sebasa rekutamisa kushushikana, internal elastic modulus iri diki uye external elastic modulus iri yakakura, kukosha kwebasa rekutamisa kushushikana kudiki, uye pesvedzero ye micro-bending loss inoenderana nayo idikiwo. Kana dhayamita ye coating yakakura, pesvedzero ye micro-bending loss inozivikanwa nekuziva.

Zviri pachena kuti dhayamita ye900um idiki zvikuru pane kurasikirwa ne microbending ye 250um fiber. Zvinogonawo kuzivikanwa kuti mukugadzirwa kwakafanana kwe fiber optic cable, kunyange zvazvo nzvimbo yekushanda ye 900um fiber iri diki, mumamiriro ezvinhu akajairwa, kurasikirwa kwayo micro-bending kudiki chaizvo mu cable.

Chinhu chechitatu ndechekukanganiswa kwenzvimbo iri tambo. Nekuda kwekuoma kwekurasikirwa ne micro-bending, hapana nzira yekuedza yakajairika parizvino, uye nzira yekuedza yakapihwa neIEC/TR62221 inowanzo shandiswa zvakananga. Zvakaoma kuziva kukanganiswa. Kunyangwe kune dzimwe nzira dzekuedza, nzvimbo dzekuedza uye michina yekuedza, nzvimbo dzakasiyana dzekuisa dzinogona kuva nemigumisiro yakasiyana. Mhedzisiro yemarabhoritari akasiyana uye nzira dzakasiyana dzekuedza hadzigone kuenzaniswa zvakananga, asi dzese kuenzanisa kwemhando. Pamhedzisiro yayo yekuedza, inofanirwa kuongororwa yoga.