Random optical pulse generation with bistable semiconductor ring lasers

Satosh Sunada*, Takahisa Harayama, Kenichi Arai, Kazuyuki Yoshimura, Ken Tsuzuki, Atsushi Uchida, Peter Davis

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)


We experimentally show that a random optical pulse train can be generated by modulating a bistable semiconductor ring laser. When the ring laser is switched from the monostable to the bistable regime, it randomly selects one of two different stable unidirectional lasing modes, clockwise or counterclockwise modes. Non-deterministic random pulse sequences are generated by driving the switch parameter, the injection current, with a periodic pulse signal. The origin of the nondeterministic randomness is the amplified spontaneous emission noise coupled to the counter-propagating lasing modes. The statistical randomness properties are optimized by adjusting the relative strength of amplified spontaneous emission noise sources for the two lasing modes. It is also shown that it is possible to generate optical pulse sequences which pass a standard suite of statistical randomness tests.

Original languageEnglish
Pages (from-to)7439-7450
Number of pages12
JournalOptics Express
Issue number8
Publication statusPublished - 2011 Apr 11
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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