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Applied Optics

Applied Optics


  • Vol. 31, Iss. 16 — Jun. 1, 1992
  • pp: 3046–3050

Active-fiber star coupler that uses arrays of microlenses and liquid-crystal modulators

Kasra Rastani, Chinlon Lin, and Jay S. Patel  »View Author Affiliations

Applied Optics, Vol. 31, Issue 16, pp. 3046-3050 (1992)

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An active-fiber star coupler that uses arrays of N × N microlenses and liquid-crystal modulators is presented. A simplified implementation of this device uses an 8 × 8 array of Fresnel microlenses fan out an incident beam into 64 focused spots (an 18 dB fan-out loss); on–off capability (270:1 extinction ratio) at each element is provided by liquid-crystal spatial light modulators. A row of focused spots is coupled into an array of 1 × 8 multimode fibers with a measured excess loss of 12 dB along each path (with an estimated overall loss of 30 dB in an 8 × 8 device). A modification of this device that is capable of wavelength selection at individual output fibers is proposed for wavelength division multiplexing applications.

© 1992 Optical Society of America

Original Manuscript: July 25, 1991
Published: June 1, 1992

Kasra Rastani, Chinlon Lin, and Jay S. Patel, "Active-fiber star coupler that uses arrays of microlenses and liquid-crystal modulators," Appl. Opt. 31, 3046-3050 (1992)

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