Methods and apparatus for secure optical communications links

H - Electricity – 04 – B

Patent

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Details

H04B 10/10 (2006.01) H04B 10/12 (2006.01) H04L 9/00 (2006.01) H04L 9/08 (2006.01)

Patent

CA 2217218

Methods and apparatus for providing a secure optical communications link are disclosed. Communications information is encrypted with a security key. An optical beam is then modulated with both the security key and the encrypted communications information, with different modulation schemes being used for each. The dual-modulated optical beam is then transmitted to a receiver. At the receiver, the optical beam is split into first and second optical beams. First and second demodulators are then employed to demodulate the optical beams to recover the encrypted communications information and its data rate, and the security key and its data rate. The encrypted communications information, the security key, and the data rate information are then sent to decryption and timing circuitry which decrypts the encrypted communications information to obtain the original unencrypted communications information.

Méthodes et appareil permettant d'offrir une liaison de communication optique sûre. L'information à communiquer est codée au moyen d'une clé de sécurité. Un faisceau optique est ensuite modulé au moyen de la clé de sécurité et de l'information de communication codée, différents schèmes de modulation étant appliqués dans chaque cas. Le faisceau optique deux fois modulé est ensuite transmis à un récepteur. Là, il est scindé en un premier et un deuxième faisceaux optiques. Un premier et un deuxième démodulateurs servent ensuite à démoduler les faisceaux optiques afin de récupérer l'information de communication codée et son débit binaire, ainsi que la clé de sécurité et son débit binaire. L'information de communication codée, la clé de sécurité et l'information sur les débits binaires sont ensuite transmises aux circuits de décodage et d'horloge, qui décodent l'information de communication afin de l'obtenir sous sa forme originelle non codée.

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