Abstract

We propose and experimentally demonstrate a $40\mathrm{Gb}/\mathrm{s}$ secure optical communication system with on–off-keying (OOK) modulation format by using a time domain spectral phase en/decoding scheme, which employs a highly dispersive element and high-speed phase modulator for introducing significant symbol overlapping for both the encoded and incorrectly decoded noiselike signals to enhance the information security against eavesdropping using a power detector. The influence of dispersion and chip modulation rate on the symbol overlapping of the incorrectly decoded signal has been analytically investigated and experimentally verified. Security enhancement for $40\mathrm{Gb}/\mathrm{s}$ OOK data using fast reconfigurable $40\mathrm{Gchip}/\mathrm{s}$ optical codes with code lengths of up to 1024 has been demonstrated and compared with a $10\mathrm{Gb}/\mathrm{s}$ system.

© 2011 Optical Society of America

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