Patent ID: 8428259
Filing Date: 2013-04-23
Classification: H04J,H04K

Abstract:
1. A method for transmitting an optical signal, the method comprising: receiving a first portion of an unencrypted optical signal containing data at a first time; splitting the first portion of the unencrypted optical signal containing data into a first unencrypted optical signal and a second unencrypted optical signal, the first unencrypted optical signal being identical to the second unencrypted optical signal; time-delaying the second unencrypted optical signal to generate a time-delayed second unencrypted optical signal, wherein the first unencrypted optical signal remains identical in content to the time-delayed second unencrypted optical signal but is out of phase with the time-delayed second unencrypted optical signal; continuing to receive a second portion of the unencrypted optical signal at a second time after the first time such that the second portion is received after the first portion; and generating an encrypted optical signal at an encryption device by feeding the time-delayed second unencrypted optical signal back to the encryption device and interfering the second portion of the unencrypted optical signal with the time-delayed second unencrypted optical signal.