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Summary form only given. We have presented a secure telecommunication system. The first security level is based on relative phase coding (requiring a specific decoder), while the second security level consists of sending false data which is then common-mode rejected at the decoder output.
The authors experimentally demonstrate coding and decoding of optical data using a passive spectral phase coding technique to modify the optical coherence of transmitted signals. Potential application to multiaccess communication networks is shown by demonstrating a high level of discrimination between codes.<<ETX>>
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