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Modified laser communications subcarrier technique.

The variation to this basic configuration is to electrically displace, with an electrical double balanced mixer or other frequency translator, the electrical subcarrier signal to a frequency spectrum of which one end is at or close to dc. This signal is then used to modulate the intensity or polarization of laser light. The electrical output of the direct detection photodetector is displaced in frequency with an electrical mixer to any convenient i.f. from which electrical demodulation to baseband information can be performed.