Chaos laser chips with delayed optical feedback using a passive ring waveguide

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

66 Citations (Scopus)


We report a novel chaos semiconductor laser chip in which a distributed feedback (DFB) laser, two semiconductor optical amplifiers (SOAs) and a photodiode (PD) are monolithically integrated with a passive ring waveguide. The ring-type structure with the two separate SOAs achieves stronger delayed optical feedback compared to previous chaos laser chips which use linear waveguide and facet-reflection. The integrated PD allows efficient detection of the optical signal with low optical loss. A rich variety of dynamical behaviors and optical signals can be selectively generated via injection currents to the two separate SOAs. In particular, the strong optical feedback makes possible the generation of strong broadband optical chaos, with very flat spectrum of ±6.5 dB up to 10 GHz. The stability and quality of the chaotic mode is demonstrated using strict statistical tests of randomness applied to long binary sequences extracted by sampling the optical intensity signal.

Original languageEnglish
Pages (from-to)5713-5724
Number of pages12
JournalOptics Express
Issue number7
Publication statusPublished - 2011 Mar 28
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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