Patent ID: 7200342

Claim:
A system for transmitting and receiving a communicated signal having first and second wavelengths that are optical wavelengths for frequency shift keying the communicated signal having spectrum spread data spread by a spreading code for spectrum spreading and modulating data into optically modulated data of the communicated signal that is frequency shift keyed in the optical domain for use with optical code division multiple access signaling, the system comprising, a transmitter code generator for generating the spreading code for directly modulating data into modulated data that is direct sequence spectrum spread modulated data, a transmitter optical generator for generating the first and second wavelengths, the transmitter optical generator comprising a first optical generator for generating the first wavelength and a second optical generator for generating the second wavelength, a transmitter modulator for converting the modulated data into the optically modulated data of the communicated signal communicated by the first and second wavelengths for encoding the modulated data into the optically modulated data having first and second wavelength frequency shift keyed fluctuations in the optical domain, the transmitter modulator comprising a first optical modulator for binary encoding the first wavelength, and comprises a second optical modulator for binary encoding the second wavelength, and comprises an optical coupler for combining the first and second wavelengths from the first and second optical modulators into the optically modulated data of the communicated signal, an optical path for communicating the communicated signal from the transmitter modulator, a code generator for generating a replica code of the spreading code, the replica code being generated in the electrical domain and coherently synchronized to the first and second wavelength frequency shift keyed fluctuations, a photooptical converter for receiving the communicated signal through the optical path and for converting the communicated signal into a received signal in the electrical domain, the photooptical converter converting the first and second wavelengths of the communicated signal by frequency into the received signal, and despreading means for spectrum despreading the received signal into a despread signal in the electrical domain for detecting the data.