Cholumikizira cha fiber optic

1. Njira yotumizira

Amatanthauza njira yotumizira kuwala mu ulusi wa kuwala (mawonekedwe a electromagnetic field distribution).Ulusi wolumikizana womwe umagwiritsidwa ntchito

modes amagawidwa mu single mode ndi multimode, ndi mode limodzi oyenera kufala mtunda wautali ndi multimode oyenera

kufala kwafupipafupi.G652D single mode kuwala ulusi ali ndi pakati awiri d1 wa 9 um ndi cladding m'mimba mwake d2 wa 125 um.Multimode

ulusi wa kuwala amagawidwa m'mitundu iwiri: 62.5/125 kapena 50/125.

Kusankhidwa kwa optical fiber mode kuyenera kufanana ndi gawo la Optical, apo ayi kungayambitse kutayika kwina chifukwa cha kusagwirizana pakati pa mainchesi.

Kulumikizana pakati pa ulusi wa kuwala ndi zingwe zokhala ndi mainchesi osiyanasiyana sikovomerezeka.

2. Kuyika kutaya

Kuchuluka kwa mphamvu yochepetsera mphamvu yamawu, yomwe nthawi zambiri imawonetsedwa mu ma decibel, mukamagwiritsa ntchito zolumikizira za fiber optic polumikizira.Mwachitsanzo,

pamene kutayika kwa kuika ndi 3dB, kutaya mphamvu kwa kuwala kuli pafupifupi 50%.Pamene kutayika kwa kuika ndi 1dB, kutaya mphamvu kumakhala pafupifupi

20%, ndi IL=- 10lg (mphamvu yamagetsi yotulutsa / mphamvu yamagetsi yolowetsa).

3. Bwezerani kutaya

Imadziwikanso kuti kutayika kwa chiwonetsero, imatanthawuza gawo la mawonekedwe a siginecha.Kutayika kwa Echo kumalongosola ndalama zomwe abweza

chizindikiro cha kuwala pamene chikubwerera ku njira yoyambirira.Nthawi zambiri, mtengo wokulirapo umakhala wabwinoko.Mwachitsanzo, pamene akulowetsa 1mw mphamvu, 10% ya izo

kuwonetseredwa mmbuyo, komwe kuli 10dB, ndipo 0.003% ikuwonetsedwa mmbuyo, zomwe zimapangitsa kuti ma echo awonongeke pafupifupi 45dB.RL = - 10lg (mphamvu yowunikira /

magetsi olowera)

4. Mtundu wa nkhope

Mitundu ya kuwala kwa fiber pamwamba imagawidwa kukhala PC (yozungulira pamwamba) ndi APC (oblique spherical surface akupera).Pambuyo APC akupera,

kuwala konyezimira komwe kumabwerera m'njira yoyambirira kumachepetsedwa kwambiri, zomwe zimathandiza kupititsa patsogolo kutayika kwa cholumikizira.