1.optical eriri isi Ọdịdị
1) Isi: elu refractive index, eji na-ebunye ọkụ;
2) Cladding: obere refractive index, na-akpụ a ngụkọta echiche ọnọdụ na isi;
3) oyi akwa mkpuchi: na-echebe eriri anya.
2.Single-mode na multi-mode
Naanị otu ụdị ọkụ nwere ike ibunye. Ya mere, ya inter-mode mgbasa bụ obere na adabara ime nkwurịta okwu, ma e nwekwara ihe dispersion na waveguide dispersion. N'ụzọ dị otú a, eriri otu ụdị nwere ihe dị elu chọrọ maka obosara na nkwụsi ike nke ìhè ọkụ, ya bụ, obosara obosara ga-adị warara na nkwụsi ike ka mma. Otu ụdị eriri nwere efu mkpokọta mgbasa.
Nwere ike ibunye ọtụtụ ụdị ọkụ. Otú ọ dị, mgbasa ozi n'etiti ọnọdụ ya buru ibu, nke na-egbochi oge nke na-ebufe akara dijitalụ, ọ ga-adịkwa njọ site n'ịbawanye anya. Ogologo nnyefe eriri ọtụtụ ụdị dị mkpụmkpụ, n'ozuzu naanị kilomita ole na ole.
Ngwá ọrụ otu ụdị nwere ike na-agba ọsọ na eriri otu mode ma ọ bụ eriri multimode, ebe akụrụngwa na-ejedebe na-agba ọsọ na eriri multi mode.