Optical communications – Transmitter and receiver system – Including compensation
Reexamination Certificate
2007-10-02
2007-10-02
Bello, Agustin (Department: 2613)
Optical communications
Transmitter and receiver system
Including compensation
C398S140000, C398S118000, C398S119000
Reexamination Certificate
active
10676450
ABSTRACT:
Free-space optical (FSO) laser communication systems offer exceptionally wide-bandwidth, secure connections between platforms that cannot other wise be connected via physical means such as optical fiber or cable. However, FSO links are subject to strong channel fading due to atmospheric turbulence and beam pointing errors, limiting practical performance and reliability. We have developed a fade-tolerant architecture based on forward error correcting codes (FECs) combined with delayed, redundant, sub-channels. This redundancy is made feasible though dense wavelength division multiplexing (WDM) and/or high-order M-ary modulation. Experiments and simulations show that error-free communications is feasible even when faced with fades that are tens of milliseconds long. We describe plans for practical implementation of a complete system operating at 2.5 Gbps.
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Dowla Farid U.
Johnson Gary W.
Ruggiero Anthony J.
Bello Agustin
Lee John H.
The Regents of the University of California
Wooldridge John P.
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