A single-transmission holographic optical element capable of broadband five-channel demultiplexing in multimode fiber is described. A holographic optical element demultiplexer combines a hologram on dichromated gelatin with a computer-generated hologram. A design of the demultiplexer with a nonspherical wave front based on ray tracing and the optimization technique perfectly permits five cross-talk isolations by reducing the aberrations of multiple focused spots caused by a recording-readout wavelength shift. Such a system has a channel separation of 300 μm (20 nm in wavelength difference) between adjacent fibers in an operating laser diode wavelength region of 0.8–0.88 μm. Experiments demonstrating the feasibility of this demultiplexer with a 780-nm laser diode source are presented.
© 1993 Optical Society of America
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