Tone modulation for out-of-band communication in a...

Details Tone modulation for out-of-band communication in a... Tone modulation for out-of-band communication in a...

2005-09-06

2005-09-06

Chan, Jason (Department: 2633)

Optical communications

Optical communication over freee space

Transmitter and receiver

C398S183000, C398S185000, C398S118000

Reexamination Certificate

active

06941076

ABSTRACT:
Systems and methods for the transmission of auxiliary data via a modulated carrier signal superimposed on a primary data communication signal between terminals of a free-space optical communication system are disclosed. The carrier signal is modulated with an auxiliary data signal via phase-shift keying, amplitude-shift keying, frequency-shift keying, or other suitable modulation technique, and superimposed on the primary data communication signal prior to transmission as an optical signal by a transmitting free-space optical terminal. The primary data communication signal is received by at least one photo detector coupled to a receiving free-space optical terminal that demodulates the primary data communication signal to reconstruct the auxiliary data.

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