Holographic multiplexer/demultiplexer and its manufacturing meth

Details Holographic multiplexer/demultiplexer and its manufacturing meth Holographic multiplexer/demultiplexer and its manufacturing meth

1986-07-25

1989-04-25

Arnold, Bruce Y.

350 9619, G02B 532, G02B 634

Patent

active

048241938

ABSTRACT:
A holographic multiplexer and holographic demultiplexer, which has a diffraction grating formed of a hologram with an interference pattern produced by interference of two wave fronts, of which at least one wave front is of an aspherical wave and the other is of, for example, a spherical wave, and its manufacturing method are disclosed. The aspherical wave is used for correction of aberration and provided by obtaining the phase function .phi..sub.G of the aspherical wave using a computer generated hologram and through an optical method or an electron-beam direct drawing method. The hologram serving as the diffraction grating for the holographic multiplexer/demultiplexer is produced by a two-beam interference method of an electron-beam direct drawing method. As the result, a holographic multiplexer/demultiplexer having a high degree of multiplexing, which is compact in size, and exhibiting low loss of light can be provided.

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Watanabe et al., "Slab Waveguide Demultiplexer for Multimode Optical Transmission in the 1.0-1.4-.mu.m Wavelength Region", Applied Optics, vol. 19, No. 21, Nov. 1, 1980, pp. 3808-3591.
Philippe et al. Wavelength Demultiplexer: "Using Echelette Coatings on a Silicon Substrate", Applied Optics, vol. 24, No. 7, Apr. 1, '85, pp. 1006-1011.

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