Kubomi bokwenyani, ngenxa yesantya sokukhanya, siphuhlisa ukukhanya ukusasaza ulwazi.
Kanye njengokuba sihlala sisebenzisa ilizwi ukunxibelelana, ukuba umntu ufuna ukuthetha, bafuna inkxaso yezicubu zomzimba zezwi. Ngokomzekelo, umqala wethu ungomnye wezona zitho zibalulekileyo zezwi, kwaye ngokuqinisekileyo, izicubu zezwi ngaphakathi komqala wethu zibaluleke kakhulu.
Ngokufanayo, ukuba sifuna ukusebenzisa ukukhanya ukuze sithethe, sikwafuna ilungu elikhanyayo. Imodyuli yokukhanya ifana nomqala, kwaye isixhobo esikhanyayo sinokuthelekiswa nethambo lelizwi, elibizwa ngokuba yi-tosa.
Ngokuqinisekileyo, unxibelelwano yinkqubo yokunxibelelana, ngoko ke ngaphezu kokuthetha, akwanelanga, kodwa kuyimfuneko ukuba ukwazi ukuphulaphula. Emzimbeni womntu, sineendlebe zokusinceda siphulaphule. Ngokufanayo, kunxibelelwano lwe-optical, sineemodyuli ezifumana ukukhanya. Izixhobo ezinokufumana ukukhanya zihambelana ne-tympanum ngaphakathi kwendlebe, esiyibiza ngokuthi i-rosa. Isixhobo esikwaziyo ukuthetha nokuphulaphula kuthiwa yi- bosa.
Nangona kunjalo, kubomi bokwenyani, isandi esinokusenza thina bantu simiselwa ngokusisiseko emva kokuzalwa okanye emva kwexesha lokutshintsha isandi. Ngokuqhelekileyo, u-A akakwazi ukwenza isandi se-B, kwaye u-B akakwazi ukwenza isandi sika-A. Kuyafana nakwiimodyuli ze-optical. Kwimodyuli enye, imodyuli A ayinakukhupha ubude bobude bemodyuli B. Kuyafana nolwamkelo. Kwimowudi enye, imodyuli ye-optical ayikwazi ukwahlula. Kufuneka umxelele ukuba ngubani othethayo (usebenzisa imodyuli ehambelana nobude bokukhanya) phambi kokuba afumane ulwazi.
“Imodyuli yobudenge ngolo hlobo ayinakuhlangabezana neemfuno ezisebenzayo, ngoko ke sinokuyibuyekeza ngokusebenzisa imodyuli ye-optical enokufakwa nangaphandle ngokulula. Okwangoku, imodyuli ye-optical ilingana nesiguquli sesandi, kwaye unokwenza nasiphi na isandi (esiphi na ubude be-wavelength) ofuna ukuba siphume.