Abstract: A VSB generation control system is provided that uses received signal quality (detected error rate) as a measure of correct VSB filter or signal wavelength adjustment. The use of VSB will offer spectral efficiency improvements for optical transmission and the margins gained may be used either to increase span length or reduce wavelength spacing. The control loops proposed offer minimal complexity and implementation whilst providing reliable and understandable performance improvement.

Abstract: A method and apparatus for transmitting optical data in an RZ modulation format is provided, which comprises passing a chirped NRZ encoded optical signal through a dispersive element to cause the light to bunch into packets centered on a respective clock cycle. An optical NRZ signal is transformed into a chirped RZ format by applying optical phase or frequency modulation at the data clock rate, and subsequently passing it through linear chromatic dispersion. The architecture required to perform this function can be implemented using a single Lithium Niobate substrate incorporating two modulation functions.