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A true random bit generator (T-RBG) based on optoelectronic oscillator (OEO) with randomly distributed feedback is proposed and experimentally demonstrated. Through the implementation of a random fiber Bragg grating (RFBG) inside the OEO loop, a randomly distributed feedback is introduced into the proposed scheme, which allows it to produce broadband random signal and be used as entropy source. The random sequence can be obtained at a rate of 250 Gbps (50 GS/s × 5 bits) in real time, and it successfully passed all the NIST SP 800-22 tests. • A true random bit generator based on optoelectronic oscillator with randomly distributed feedback is proposed to generate true random bit sequences. • A random fiber Bragg grating is inserted into the OEO cavity to enable the proposed system to generate broadband random signal. • Random sequences can be obtained at a rate of 250 Gbps (50 GS/s × 5 bits) in real time and pass all the NIST SP 800-22 statistical tests. [ABSTRACT FROM AUTHOR]

A correlation optical time domain reflectometry (COTDR) based on broadband random optoelectronic oscillator (OEO) is proposed and experimentally demonstrated. Different from the conventional COTDR that utilizes an external feedback semiconductor laser as the chaotic source, the proposed scheme employs a random optoelectronic oscillator as the random signal source. With the assistance of randomly distributed feedback in the OEO caused by the random fiber Bragg grating, the generated signals have random and broadband characteristics, whose frequencies are not restricted by a fixed cavity length in the OEO. Due to the avoidance of relaxation oscillations in semiconductor chaotic laser, the generated random signal has a wide and flat spectrum as well as excellent autocorrelation features. The experimental results illustrate that the proposed COTDR can achieve a range-independent spatial resolution of about 10 mm and its dynamic range is at least 78.47 km. • A correlation optical time domain reflectometry based on broadband random optoelectronic oscillator is proposed and experimentally demonstrated. • A random optoelectronic oscillator is employed as the random signal source with a wide and flat spectrum alongside excellent autocorrelation features. • The proposed COTDR can achieve a range-independent spatial resolution of about 10 mm and its dynamic range is at least 78.47 km. [ABSTRACT FROM AUTHOR]