研究目的
To experimentally demonstrate high-speed correlated random bit generation in real time using synchronized chaotic lasers commonly driven by a laser with dispersive feedback.
研究成果
The study successfully demonstrated real-time high-speed correlated random bit generation using synchronized chaotic lasers driven by a laser with dispersive feedback. The dispersive feedback from a CFBG eliminated TDS, ensuring signal randomness and security. High-correlation synchronization between response lasers was achieved, with a low correlation level with the drive signal. Real-time 2.5-Gb/s correlated random bits with verified randomness were obtained, with potential for further BER reduction using robust sampling methods. The synchronization superiority of the responses over the drive was confirmed, indicating lower BER between responses over a wide parameter region.
研究不足
The main limitation is the relatively high bit error ratio (BER) of 0.07 for real-time correlated random bits between the responses, attributed to synchronization degradation after differential comparison. The difference in delay time of differential inputs of the two comparators is identified as a main driver for these errors.
1：Experimental Design and Method Selection:
The experiment utilizes a distributed feedback semiconductor laser with chirped fiber Bragg grating (CFBG) feedback as the common drive light source. The CFBG induces frequency-dependent feedback delay, eliminating time-delay signature (TDS) and ensuring signal randomness and security. The chaotic signal drives two response lasers into chaotic states, establishing synchronization.
2：Sample Selection and Data Sources:
The drive and response lasers are semiconductor lasers with specific threshold currents and wavelengths. The CFBG has a length of 10 cm, forming a feedback round-trip time of
3：6 ns. List of Experimental Equipment and Materials:
Includes distributed feedback semiconductor lasers, CFBG, polarization controller (PC), variable optical attenuator (VOA), optical amplifier (EDFA), photodetectors (PD), one-bit differential comparator (COM), D-type flip-flop (DFF), and trigger clock (CLK).
4：Experimental Procedures and Operational Workflow:
The drive laser's chaotic output is amplified and split into two branches, each injected into a response laser. The outputs are converted to electrical signals, quantized, and compared to generate correlated random bits.
5：Data Analysis Methods:
The correlation between the response lasers' outputs is analyzed, and the bit error ratio (BER) is calculated to evaluate the quality of the correlated random bits.
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