Njikọ fiber optic

1. Ụdị nnyefe

Na-ezo aka n'ụdị nnyefe nke ìhè n'ime eriri anya (ụdị nkesa oghere electromagnetic).Fibre nzikọrịta ozi a na-ejikarị

modes na-ekewa n'ime otu mode na multimode, na otu mode adabara ogologo-anya nnyefe na multimode kwesịrị ekwesị maka.

nnyefe dị mkpụmkpụ.G652D otu ụdị eriri anya nwere otu dayameta d1 nke 9 um na dayameta mkpuchi d2 nke 125 um.Multimode

A na-ekekarị eriri anya ụzọ abụọ: 62.5/125 ma ọ bụ 50/125.

Nhọrọ nke ụdị eriri anya ga-adabarịrị na modul ngwa anya, ma ọ bụghị ya, ọ ga-ebute mfu ndị ọzọ n'ihi ngbanwe isi dayameta.

A naghị atụ aro njikọ n'etiti eriri anya na eriri nwere dayameta isi dị iche iche.

2. Ntinye ntinye

Ọnụego mbelata ike mgbaama ngwa anya, nke a na-egosipụtakarị na decibels, mgbe ị na-eji njikọ fiber optic maka njikọ.Ọmụmaatụ,

mgbe ntinye ntinye bụ 3dB, ọnwụ ike anya bụ ihe dịka 50%.Mgbe ntinye ntinye bụ 1dB, ọnwụ ike dị ihe dịka

20%, na IL = - 10lg (ike ngwa anya / ntinye anya ike).

3. nloghachi ọnwụ

Amarakwa dị ka mfu ntụgharị uche, ọ na-ezo aka na oke nleba anya nke mgbaàmà.Mfu Echo na-akọwa ego weghachiri eweghachi

mgbama ngwa anya mgbe ọ laghachiri na ụzọ izizi.N'ozuzu, ka uru ahụ buru ibu, ọ ka mma.Dịka ọmụmaatụ, mgbe ntinye ike 1mw, 10% nke ya bụ

tụgharịa uche azụ, nke bụ 10dB, na 0.003% na-egosipụta azụ, na-ebute mwepu nkwughachi nke ihe dịka 45dB.RL = - 10lg (ike ọkụ gosipụtara /

ntinye ike ọkụ)

4. Ụdị ihu

Ngwa anya eriri elu ụdị na-ekewa n'ime PC (spherical elu-egweri) na APC (oblique spherical elu-egweri).Mgbe APC mechachara,

ọkụ ọkụ na-egosipụta na-alọghachi n'akụkụ ụzọ mbụ ahụ na-ebelata nke ukwuu, nke na-enyere aka melite nkwụsịghachi nke njikọ.