Abstract
A novel scheme is proposed, in which the aberrations in the off-axis
holographic lenses used as demultiplexers are reduced to a low enough level for
relatively small channel spacing. The scheme includes optimizing the recording and
reconstruction geometries and collimating the reconstruction wave with a
gradient-index lens. A demultiplexer operated in the 1 550-nm band with 5-nm channel
spacing and ?\infty-dB crosstalk is obtained using the scheme. The channel spacing
can be decreased to 2 nm by etching the cladding of the output fibers to a smaller
size.
© 2011 Chinese Optics Letters
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