Patent ID: 8701161
Filing Date: 2014-04-15
Classification: H04B,H04L

Abstract:
1. An optical communication system, comprising: a first optical communication device; and a second optical communication device coupled to the first optical communication device via an optical fiber, the second optical communication device having a receiver configured to receive from the optical fiber an optical signal transmitted by the first optical communication device, the optical signal comprising a data signal defining data and a security signal embedded in the data signal via amplitude modulation of the data signal, the receiver configured to demodulate the optical signal thereby recovering the data from the data signal and security information from the security signal, wherein the second optical communication device is configured to detect whether an intrusion device is coupled to the optical fiber between the first and second optical communication devices based on the security information, and wherein a power of the security signal is sufficiently less than a power of the data signal such that the amplitude modulation of the data signal with the security signal affects an amplitude of the data signal by less than 10 percent.