Method and apparatus for generating 8-QAM-modulated optical...

Details Method and apparatus for generating 8-QAM-modulated optical... Method and apparatus for generating 8-QAM-modulated optical...

2009-11-11

2011-12-13

Pinkney, Dawayne (Department: 2873)

Optical: systems and elements

Optical modulator

Light wave temporal modulation

C359S238000, C385S003000

Reexamination Certificate

active

08077375

ABSTRACT:
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.

REFERENCES:
patent: 7817923 (2010-10-01), Akiyama et al.
patent: 2006/0263098 (2006-11-01), Akiyama et al.
patent: 2009/0185810 (2009-07-01), Kaplan et al.
patent: 2009/0324253 (2009-12-01), Winzer
patent: 2010/0329680 (2010-12-01), Presi et al.

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