Multiplex communications – Wide area network – Packet switching
Patent
1989-11-13
1991-06-25
Arnold, Bruce Y.
Multiplex communications
Wide area network
Packet switching
370 3, 350 9619, 3501622, 35016221, G02B 518
Patent
active
050261312
ABSTRACT:
A wavelength division multiplexer/demultiplexer having optical path lengths between a fiber array and a Fourier transform lens, and between a dispersion grating and the lens equal to the focal length of the lens. The equal optical path lengths reduce losses due to angular acceptance mismatch in the multiplexer. Close orientation of the fiber array about the optical axis and the use of a holographic dispersion grating reduces other losses in the system. Multi-exposure holographic dispersion gratings enable the multiplexer/demultiplexer for extremely broad-band simultaneous transmission and reflection operation. Individual Bragg plane sets recorded in the grating are dedicated to and operate efficiently on discrete wavelength ranges. A volume Bragg vertically non-uniform holographic grating enables operation of the multiplexer or other devices that act on light waves according to wavelength over nearly the full usable 0.8-1.3 .mu.m wavelength range.
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"Fiber-Optic Wavelength-Division Multiplexing and Demultiplexing Using Volume Holographic Gratings", Moslehi et al., Optics Letters, vol. 14, #19, Oct. 1989.
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Jannson Joanna L.
Jannson Tomasz P.
Moslehi Behzad
Rich Christopher C.
Arnold Bruce Y.
Physical Optics Corporation
Ryan J. P.
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