Fiber otu ụdị (SingleModeFiber) bụ eriri anya nke nwere ike ibunye naanị otu ụdị na ogologo ogologo ogologo.Isi iko etiti dị gịrịgịrị (dayameta isi bụ 9 ma ọ bụ 10μm).
Ya mere, ya inter-mode dispersion bụ nnọọ obere, adabara ime nkwurịta okwu Otú ọ dị, e nwekwara ihe dispersion na waveguide dispersion, nke mere na otu-mode eriri nwere elu chọrọ na ụdịdị obosara na nkwụsi ike nke ìhè isi iyi, ya bụ, obosara spectral kwesịrị ịdị warara na nkwụsi ike ka mma.
Mgbe e mesịrị, a chọpụtara na na 1.31μm wavelength, ihe dispersion nke otu-mode ngwa anya eriri na waveguide dispersion bụ nti na-adịghị mma, na ịdị ukwuu bụ kpọmkwem otu.N'ụzọ dị otú a, 1.31μm wavelength mpaghara aghọwo ezigbo window na-arụ ọrụ maka ngwa anya fiber nkwukọrịta, na ugbu a bụ isi ọrụ ìgwè nke bara uru ngwa anya fiber nkwurịta okwu usoro.The isi parameters nke 1.31μm ot otu-mode eriri na-atụ aro site International Telecommunication Union ITU-T na G652 Ụfọdụ, otú a eriri na-akpọ G652 eriri.Enwere ike kewaa eriri otu ụdị n'ime 652 otu ụdị eriri, 653 otu ụdị eriri na 655 otu ụdị eriri.
Nkọwa nke “fiber otu ụdị” na akwụkwọ agụmakwụkwọ: n'ozuzu, mgbe v bụ ihe na-erughị 2.405, naanị otu ọnụ ọgụgụ kasị elu nke eriri na-agafe, ya mere a na-akpọ ya otu eriri eriri.Isi ya dị gịrịgịrị, ihe dịka 8-10 microns, na mgbasa nke ọnọdụ dị obere.Isi ihe na-emetụta obosara nke eriri nnyefe eriri bụ mgbasa ozi dị iche iche, na mgbasa ozi bụ ihe kachasị mkpa.Mgbasa nke eriri otu ụdị dị obere, ya mere ọ nwere ike ibunye ọkụ n'ime eriri ogologo ogologo ogologo ogologo.
The otu-mode eriri nwere a isi dayameta nke 10 micron, nke na-enye ohere otu-mode beam nnyefe, nke nwere ike ibelata bandwit na Modal Dispersion.Otú ọ dị, n'ihi na otu-mode eriri isi dayameta dị oke obere, ọ na-esiri ike ịchịkwa nnyefe nnyefe, n'ihi ya, ọ dị mkpa ka oké ọnụ lasers na-eji dị ka ìhè isi iyi, na isi mmachi nke otu-mode ngwa anya cables bụ ihe dispersion. .Igwe nyocha anya nke otu ụdị na-ejikarị lasers nweta bandwidth ugboro ugboro.Ebe ọ bụ na LEDs ga-ebunye ọnụ ọgụgụ dị ukwuu nke isi iyi ọkụ dị iche iche na bandwit dị iche iche, ihe ndị na-ekesa ihe dị mkpa dị ezigbo mkpa.Single-mode eriri nwere ike na-akwado ogologo nnyefe anya karịa multi-mode eriri.Na 100Mbps Ethernet ma ọ bụ 1G Gigabit netwọk, otu ụdị eriri nwere ike na-akwado nnyefe anya nke ihe karịrị 5000m si a ọnụ ahịa anya.Site n'echiche nke ọnụ ahịa, ebe ọ bụ na transceiver ngwa anya dị oke ọnụ, ọnụ ahịa nke iji eriri anya nke otu mode ga-adị elu karịa ọnụahịa nke eriri eriri eriri multi-mode.
The refractive index nkesa yiri abrupt ngwa anya eriri, isi dayameta bụ naanị 8 ~ 10μm, na ìhè propagates na a linear udi tinyere isi axis.N'ihi na eriri a nwere ike ibunye naanị otu ụdị (steeti polarization abụọ na-emebi emebi), a na-akpọ ya eriri otu mode na mgbagha mgbagha ya dị obere.