| 摘要 |
The invention provides, in a system for effecting information security in an optical communication network, an optical data encryptor including first input means for receiving information signals to be transmitted over said communication network; a frequency-to-frequency coding means for coding the information received and for transforming the coded information into a stream of differential frequency shift keying (DFSK) signals; second input means for receiving key signals; a frequency modulation unit for receiving the DFSK stream and the key signals, for matching each signal of the DFSK stream with m key signals, and for dividing the matched stream into sets of n signals each, where m and n are positive integers; and a combiner for combining the sets, to be utilized for modulating optical transmitting means prior to effecting encrypted optical transmission over the communication network. |
