SECURE ORTHOGONAL FREQUENCY MULTIPLEXED OPTICAL COMMUNICATIONS
First Claim
1. A system for secure data transmission via optical link, comprising:
- an optical transmitter for orthogonal frequency division multiplexed (OFDM) communications, wherein each channel carrier has multiple subcarriers, each subcarrier being individually encoded with data and a data encoding format is different for different subcarriers;
the transmitter is sending data to an optical receiver;
an output electrical signal from the optical receiver is processed in a digital signal processing (DSP) unit to recover data from each subcarrier.
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Accused Products
Abstract
The invention provides a system and method for secure communication that involve encoding and transmitting an optical orthogonal frequency division multiplexed (OFDM) signal. Each subcarrier of an optical carrier in OFDM transmission is modulated with data individually, and a variety of data format are used, such as QPSK, OOK, QAM, etc. The data format of each subcarrier may change in time according to a predetermined pattern. An optical receiver uncovers the data transmitted via an optical link. It is based on a coherent optical receiver and a digital signal processing (DSP) unit. A key to the data mapping and change is transmitted via the same optical link or by a separate channel. In one embodiment, the key is transmitted using quantum encryption technique. Besides subcarrier modulation encoding, the system may provide additional layers of security: optical carrier frequency hopping and polarization scrambling.
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Citations
20 Claims
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1. A system for secure data transmission via optical link, comprising:
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an optical transmitter for orthogonal frequency division multiplexed (OFDM) communications, wherein each channel carrier has multiple subcarriers, each subcarrier being individually encoded with data and a data encoding format is different for different subcarriers; the transmitter is sending data to an optical receiver; an output electrical signal from the optical receiver is processed in a digital signal processing (DSP) unit to recover data from each subcarrier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of optical secure communication, comprising:
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transmitting data using an optical carrier from a transmitter to an optical receiver, the optical carrier has N subcarriers, N>
1, the subcarriers forming an orthogonal frequency division multiplexed (OFDM) optical signal;each subcarrier being individually encoded with data and a data encoding format is different for different subcarriers; receiving the OFDM encoded signal using the optical receiver, where it is mixed with a signal from a local oscillator; an output electrical signal from the optical receiver is processed in a digital signal processing (DSP) unit to recover data from each subcarrier. - View Dependent Claims (18, 19, 20)
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Specification