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Applied Optics

Applied Optics


  • Vol. 39, Iss. 14 — May. 10, 2000
  • pp: 2278–2286

Spatial-phase code-division multiple-access system with multiplexed Fourier holography switching for reconfigurable optical interconnection

Kazuya Takasago, Makoto Takekawa, Atsushi Shirakawa, and Fumihiko Kannari  »View Author Affiliations

Applied Optics, Vol. 39, Issue 14, pp. 2278-2286 (2000)

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A new, to our knowledge, space-variant optical interconnection system based on a spatial-phase code-division multiple-access technique with multiplexed Fourier holography is described. In this technique a signal beam is spread over wide spatial frequencies by an M-sequence pseudorandom phase code. At a receiver side a selected signal beam is properly decoded, and at the same time its spatial pattern is shaped with a Fourier hologram, which is recorded by light that is encoded with the same M-sequence phase mask as the desired signal beam and by light whose spatial beam pattern is shaped to a signal routing pattern. Using the multiplexed holography, we can simultaneously route multisignal flows into individually specified receiver elements. The routing pattern can also be varied by means of switching the encoding phase code or replacing the hologram. We demonstrated a proof-of-principle experiment with a doubly multiplexed hologram that enables simultaneous routing of two signal beams. Using a numerical model, we showed that the proposed scheme can manage more than 250 routing patterns for one signal flow with one multiplexed hologram at a signal-to-noise ratio of ∼5.

© 2000 Optical Society of America

OCIS Codes
(090.4220) Holography : Multiplex holography
(100.5090) Image processing : Phase-only filters
(200.4650) Optics in computing : Optical interconnects
(200.4740) Optics in computing : Optical processing

Original Manuscript: February 8, 1999
Revised Manuscript: January 3, 2000
Published: May 10, 2000

Kazuya Takasago, Makoto Takekawa, Atsushi Shirakawa, and Fumihiko Kannari, "Spatial-phase code-division multiple-access system with multiplexed Fourier holography switching for reconfigurable optical interconnection," Appl. Opt. 39, 2278-2286 (2000)

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