Patent ID: 7609968
Filing Date: 2009-10-27
Classification: H04J,H04K

Abstract:
1. A secure optical communications system for transmitting a plurality of analog signals comprising: an optical link having a plurality of transmitters at a first end and a plurality of receivers at a second end, each transmitter configured to generate an analog optical signal at a respective one of a plurality of wavelengths in response to an analog electrical signal, and each receiver adapted to detect one of the analog optical signals at the respective wavelength; an analog multiplexer having a plurality of multiplexer input terminals to accept one of the analog electrical signals and having a plurality of multiplexer output terminals each in communication with one of the transmitters; an analog demultiplexer having a plurality of demultiplexer input terminals each in communication with one of the receivers and having a plurality of demultiplexer output terminals; a first sequence logic module in communication with the analog multiplexer to provide a channel selection signal in response to a shared key; and a second sequence logic module in communication with the analog demultiplexer to provide the channel selection signal in response to the shared key, the channel selection signal controlling the switching of the multiplexer input terminals to the multiplexer output terminals and the switching of the demultiplexer input terminals to the demultiplexer output terminals, wherein the duration of a time interval between switching of the multiplexer input terminals to the multiplexer output terminals and the switching of the demultiplexer input terminals to the demultiplexer output terminals is pseudorandom and wherein each analog electrical signal provided at one of the multiplexer input terminals is reproduced at a respective one of the demultiplexer output terminals.