Amaza okukhanya yimitha ye-electromagnetic eveliswa zii-electron kwinkqubo yentshukumo yeathom.Ukushukuma kwee-electron kwiiathom zezinto ezahlukeneyo kwahlukile, ngoko ke amaza okukhanya eziwakhuphayo nawo ahlukile.
I-Spectrum yipatheni yokukhanya kwe-monochromatic eyahlulwe yinkqubo yokusabalalisa (njenge-prism kunye ne-grating) emva kokuba ukukhanya kwe-polychromatic kuhlulwe yinkqubo ye-dispersion system, ehlelwe ngokulandelelana ngokobude be-wavelength (okanye i-frequency).Ibizwa ngokuba yi-optical spectrum ngokupheleleyo.
Xa uvavanya i-tosa yokudlulisa, sidla ngokubandakanya ipharamitha, i-SMSR (iSide Mode Suppression Ratio).Umlinganiselo wexabiso eliphezulu lemowudi ephambili yamandla kumandla emowudi yecala kuthiwa yi-side mode suppression ratio, nto leyo isalathiso esibalulekileyo sokusebenza kwemowudi yelongitudinal.Ngokuqhelekileyo, xa ulinganisa umlinganiselo wokulahlwa kwendlela yecala, kufuneka isetyenziswe kunye nomakishi kunye nohlalutyo kwi-analyzer ye-spectral.Umenzi usetyenziselwa ukuchonga incopho yamaza esembindini kunye neyona ncopho iphakamileyo yamaza.Funda iincopho ezimbini.Umlinganiselo wokulahlwa kwendlela yecala ngumahluko wenqanaba lamandla phakathi kweencopho ezimbini.Inokubalwa ngokusebenzisa iinketho ezincinci kuhlalutyo.
Ichazwa njengomlinganiselo we-primary longitudinal mode optical power M1 kunye nemodi yecala elipheleleyo lamandla optical M2 phantsi kweemeko zokumodareyitha ngokupheleleyo.
Ifomula yokubala yile:
SMSR=10*lg(M1/M2)
Kwi-transmitter optical, ngokuqhelekileyo ichazwa ukuba i-SMSR inkulu kune-30dB;oko kukuthi, amandla optical yemowudi ephambili yobude bungaphezulu kwe-1000 amaxesha awona mandla aphezulu endlela yecala.Ukuphakama kwexabiso le-SMSR, ngakumbi kugxininise indlela yokukhanya.Njengoko kuboniswe kumzobo ongezantsi: i-SMSR yi-51dB
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