I-Rofea' modulator bias controller yakhelwe ngokukhethekile amamoduli e-Mach- Zehnder ukuze aqinisekise isimo sokusebenza esizinzile ezindaweni ezihlukahlukene zokusebenza.Ngokusekelwe endleleni yayo yokucubungula isignali yedijithali ngokugcwele, isilawuli singanikeza ukusebenza okuzinzile kakhulu.
Isilawuli sifaka imvamisa ephansi, isignali ye-amplitude ephansi ye-dither kanye ne-bias voltage kumoduli.Ilokhu ifunda okukhiphayo kumoduli futhi inquma isimo se-voltage echema kanye nephutha elihlobene.I-voltage entsha yokuchema izosetshenziswa amagama angemuva ngokwesilinganiso sangaphambilini.Ngale ndlela, i-modulator iqinisekiswa ukuthi isebenza ngaphansi kwe-voltage efanele yokuchema.