All-optical, all-fiber circulating shift register with an inverter.

@article{Whitaker1991AllopticalAC,
  title={All-optical, all-fiber circulating shift register with an inverter.},
  author={Norman A. Whitaker and Maria C. Gabriel and Hercules Avramopoulos and Anhui Huang},
  journal={Optics letters},
  year={1991},
  volume={16 24},
  pages={1999-2001}
}
An all-optical fiber Sagnac interferometer switch and erbium amplifier have been combined to form an all-optical 254-bit circulating shift register with an inverter. This simple optical loop memory demonstrates the cascadability of Sagnac interferometer switches. 
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