Methods and apparatus for generating 16-QAM-modulated...

Details Methods and apparatus for generating 16-QAM-modulated... Methods and apparatus for generating 16-QAM-modulated...

2009-09-02

2011-12-06

Pinkney, Dawayne (Department: 2873)

Optical: systems and elements

Optical modulator

Light wave temporal modulation

C359S279000, C385S003000

Reexamination Certificate

active

08072669

ABSTRACT:
A system and method for producing a 16-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/2; combining the modulated first part with the phase shifted and modulated second part to produce a four-level modulated signal; phase modulating the four-level modulated signal with a third signal with a phase modulation of about (0, π/2) to produce an 8-QAM-modulated signal, and thereafter modulating that signal with a fourth signal with a phase-modulation of about (0, π) to produce the 16-QAM-modulated signal.

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