An optical ultrafast random bit generator

Ido Kanter, Yaara Aviad, Igor Reidler, Elad Cohen, Michael Rosenbluh

Research output: Contribution to journalArticlepeer-review

442 Scopus citations


The generation of random bit sequences based on non-deterministic physical mechanisms is of paramount importance for cryptography and secure communications. High data rates also require extremely fast generation rates and robustness to external perturbations. Physical generators based on stochastic noise sources have been limited in bandwidth to ∼ 100Mbits-1 generation rates. We present a physical random bit generator, based on a chaotic semiconductor laser, having time-delayed self-feedback, which operates reliably at rates up to 300Gbits-1. The method uses a high derivative of the digitized chaotic laser intensity and generates the random sequence by retaining a number of the least significant bits of the high derivative value. The method is insensitive to laser operational parameters and eliminates the necessity for all external constraints such as incommensurate sampling rates and laser external cavity round trip time. The randomness of long bit strings is verified by standard statistical tests.

Original languageEnglish
Pages (from-to)58-61
Number of pages4
JournalNature Photonics
Issue number1
StatePublished - Jan 2010


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