Encrypting A 7.88ghz Frequency Message Within A Chaotic Carrier by Optical Feedback

Ayser A. Hemed, Thorsten Ackemann, Hani J. Kbashi, Baha T. Chead

Research output: Contribution to journalConference articlepeer-review


A new laser system is suggested and experimentally verified as a chaotic transmitter for a secure optical communication system. The laser source kind is a distributed feedback with a peak wavelength 1310nm and maximum power 5mW. A doubly external cavity with 85cm of length is constructed via air. Chaotic signal is achieved successfully after the laser reach of coherence collapse, with a very wide band spectrum (12GHz). This value is capable to increase subjecting to several parameters based on optical feedback (OFB) such as laser current operating level, beam focusing, polarization control, etc. In order to test a message hiding possibility, a frequency message is modulated directly into the laser, which is connected with the laser source using a bias tee. For the free running (solitary) semiconductor laser, the maximum available direct current modulation is: 3GHz/mA, while this value can be increased by this technique. This gives the possibility for very high modulation values and increasing data package volume that can send securely in the applications that requires immunity.

Original languageEnglish
Article number012027
JournalJournal of Physics: Conference Series
Issue number1
Publication statusPublished - 8 Mar 2021

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