Method and apparatus for generating 8-QAM-modulated optical signal
A system and method for producing an 8-QAM-modulated signal are disclosed. The methodology, in an exemplary expedient, generally comprises splitting light from a CW laser into two parts; modulating the first part with a first signal and modulating the second part with a second signal; phase shifting the modulated second part by about π/4; combining the modulated first part with the phase shifted and modulated second part to produce a four-level modulated signal; and phase modulating the four-level modulated signal with a third signal with a phase modulation of (0, π/2). Several variations of this method are described herein.
AT&T Intellectual Property I, L.P.
H H G
H04B H04B G02F
inventional inventional additional
Xiang Peter
Zhou Magill