Optical square-wave clock generation based on an all-optical flip-flop

Aaron M Kaplan, Govind P. Agrawal, Drew N. Maywar

Research output: Contribution to journalArticlepeer-review

41 Citations (Scopus)


We demonstrate optical square-wave clock generation based on an all-optical flip-flop. The bistable output power from a resonant-type semiconductor optical amplifier (SOA) is switched ON and OFF by modulating its input with its output via cross-gain modulation in a traveling-wave SOA. AU active components are driven by dc currents, and the wavelength and clock frequency are selectable. A clock frequency of 3.5 MHz is demonstrated, limited by the time of flight between bulk optical components. Optical square-wave clock signals are promising for applications in photonic integrated circuits and all-optical signal processing. © 2010 IEEE.

Original languageEnglish
Article number5404908
Pages (from-to)489-491
Number of pages3
JournalIEEE Photonics Technology Letters
Issue number7
Publication statusPublished - 1 Apr 2010


  • Clocks
  • Flip-flops
  • Optical bistability
  • Optical signal processing


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