Abstract

Wavelength-division-multiplexed (WDM) networks require a number of optical components for their successful implementation. Optical filters are needed to separate wavelengths; wavelength taps divide the optical power in wavelength for different destinations. These components are currently based on surface-relief gratings, dielectric thin films, or Fabry-Perot filters, and they are relatively expensive. In addition, one has to use a series of them, each tuned to a specific wavelength, to allow the selection of different wavelength combinations. This can be costly and impractical. Multiplexed volume diffraction gratings (holograms) have been previously proposed¹ as potentially inexpensive alternatives that also allow flexibility in wavelength selection.

© 1994 Optical Society of America