This demodulator is suitable for the quadrature phase-shift keying (QPSK) modulator previously published by the same author, "Novel Low-Cost QPSK Modulator Needs No Adjustments" (electronic design, ...
Fig 1. In this view of the architecture of an optical analyzer, the coherent reference receiver serves as the optical front end to the digitizer, taking as inputs two single-mode fibers, one carrying ...