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We experimentally demonstrate security vulnerability in the temporal phase coding single-user DPSK- and CSK-OCDMA systems with a DPSK demodulator. In the systems without proper decoding, error free BER performance and clear open eye diagrams indicate the eavesdropping possibility for both systems. We also discuss the principle of DPSK demodulation attack.
We report a reconfigurable 2D (temporal-spectral) coherent OCDMA system using Fiber Bragg Gratings for generating wavelength hopping pattern and single phase modulator for simultaneous time domain spectral phase encoding/DPSK data modulation.
The existence of dips in the waveform encoded by 0/π-phase-shifted superstructured fiber Bragg grating (0/π -SSFBG) allows eavesdroppers to extract code sequence straightforwardly. In this letter, the code extraction technique for 0/π-SSFBG is summarized and demonstrated. To address this security issue, we propose using ±π/2-phase-shifted ±π/2-SSFBG as encoder/decoder to improve security in time-spreading...
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