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Applied Optics

Applied Optics


  • Vol. 37, Iss. 29 — Oct. 10, 1998
  • pp: 6884–6891

Folded free-space polarization-controlled multistage interconnection network

Dan M. Marom, Paul E. Shames, Fang Xu, and Yeshaiahu Fainman  »View Author Affiliations

Applied Optics, Vol. 37, Issue 29, pp. 6884-6891 (1998)

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We present a folded free-space polarization-controlled optical multistage interconnection network (MIN) based on a dilated bypass–exchange switch (DBS) design that uses compact polarization-selective diffractive optical elements (PDOE’s). The folded MIN design has several advantages over that of the traditional transparent MIN, including compactness, spatial filtering of unwanted higher-order diffraction terms leading to an improved signal-to-noise ratio (SNR), and ease of alignment. We experimentally characterize a folded 2 × 2 switch, as well as a 4 × 4 and an 8 × 8 folded MIN that we have designed and fabricated. We fabricated an array of off-axis Fresnel lenslet PDOE’s with a 30:1 SNR and used it to construct a 2 × 2 DBS with a measured SNR of 60:1. Using this PDOE array in a 4 × 4 MIN resulted in an increased SNR of 120:1, highlighting the filtering effect of the folded design.

© 1998 Optical Society of America

OCIS Codes
(060.1810) Fiber optics and optical communications : Buffers, couplers, routers, switches, and multiplexers
(060.4250) Fiber optics and optical communications : Networks
(090.1760) Holography : Computer holography
(200.2610) Optics in computing : Free-space digital optics
(200.4650) Optics in computing : Optical interconnects
(230.5440) Optical devices : Polarization-selective devices

Original Manuscript: January 9, 1998
Revised Manuscript: June 1, 1998
Published: October 10, 1998

Dan M. Marom, Paul E. Shames, Fang Xu, and Yeshaiahu Fainman, "Folded free-space polarization-controlled multistage interconnection network," Appl. Opt. 37, 6884-6891 (1998)

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