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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 28,
  • Issue 19,
  • pp. 2890-2896
  • (2010)

A Liquid Crystal Tunable Wavelength-Interleaved Isolator With Flat Spectral Response

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Abstract

A liquid crystal tunable bidirectional isolator is proposed. A wave plate is employed to realize a wavelength interleaving function. If it works as a full wave plate, the corresponding light only may pass along a specific direction while the opposite way is isolated. However, for wavelengths that the light experiences a half wave plate, the isolator's passing direction is reversed. A liquid crystal cell is utilized to tune the isolator so that both the isolated wavelength and direction could be reconfigured. A 100-GHz channel-interleaved tunable bidirectional isolator is demonstrated with ${\sim} {\hbox {30}}$ dB isolation in both directions. The spectral response at ITU grids are further flattened by using a wave plate stacking technique.

© 2010 IEEE

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