| http://www.w3.org/ns/prov#value | - According to yet another embodiment, the present invention is a receiver for an optical QAM signal, comprising: (A) an optical detector adapted to mix the optical QAM signal with an optical LO signal to produce first and second digital measures of the QAM signal; (B) a differentiator circuit coupled to the optical detector and adapted to determine an amplitude differential and a phase differential
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