Real-time 3Â Gbit/s true random bit generator based on a super-luminescent diode

We present a real time random bit generation scheme using broadband amplified spontaneous emission noise from a super-luminescent diode (SLD) as the physical entropy source. Utilizing latch comparators, and an exclusive-or gate, we eventually demonstrate a 3 Gbit/s true random bit sequence with real waveform that can be directly applied to the communication network obtained, and its randomness satisfies all of the NIST statistical tests. Moreover, our system has the scalability so that it can generate multiple channels of true random bits simultaneously. This feature further improves its bit rate to meet the needs of secure communication with higher rate.