Tsis tshua muaj dej ncov tsis-dispersive displacement ib hom fiber ntau yog tsim rau kev sib kis ntawm tag nrho cov band 1280nm ~ 1625nm, uas tsis tsuas yog tswj qhov qis dispersion ntawm cov tsoos band 1310nm, tab sis kuj muaj qhov poob qis ntawm 1383nm, ua E band. (1360nm ~ 1460nm) siv tag nrho. Qhov poob thiab tawg ntawm tag nrho cov qhab los ntawm 1260nm mus rau 1625nm yog optimized, thiab qhov khoov poob ntawm 1625nm wavelength raug txo, uas muab bandwidth kev pab cuam rau lub caj qaum network, MAN thiab nkag mus rau network.