Abstract
We propose and demonstrate an advanced optical modulation
format that makes use of both spectral and temporal phase encodings
(2-D) for applications requiring exceptional security. The method
combines modulation techniques used in direct-sequence
spread-spectrum coding, spectral-phase encoding, and M-ary
phase-shift keying with codes generated using cryptographically
secure pseudorandom number generators. The wideband transmission
signal is very difficult for an eavesdropper to record or analyze.
Signal-to-noise ratio limitations imposed by quantum effects enhance
the security further. The properties of the transmitted signal make
it especially useful for physics-based key expansion systems. We
have successfully used this setup to transmit encrypted 155 Mb/s
data over 70 km of fiber with a BER value of 4E-5.
© 2011 IEEE
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