Multiplex communications – Wide area network – Packet switching
Patent
1988-08-08
1989-06-27
Davie, James W.
Multiplex communications
Wide area network
Packet switching
350 9618, 370 3, G02B 610
Patent
active
048423572
ABSTRACT:
An optical sensor system for multiplexing a plurality of channels conveying information encoded by light reflected from areas on a moving surface. An optical sensor head (10,10') is connected to a plurality of discrete wavelength light sources (122,126,130) by an optical fiber (14). Alternatively, a single source 70 of relatively wide spectral bandwidth may be coupled to the optical fiber. Light is conveyed by the optical fiber to the optical sensor head, passes through a waveguide channel to a plurality of branching junctions (18 and 42) long pass interference filters (20 and 44) are disposed. Light having a wavelength shorter than a predetermined value is reflected into a branching waveguide channel (24 and 48), while light having a longer wavelength is transmitted through the filter. Light that passes through both of the long pass interference filters enters a waveguide channel (60). In one embodiment, the three branching waveguide channels terminate in lenses (26, 50 and 62), so that light traveling through the waveguide channels is collimated or focused on refletive areas of a moving surface (30), reflecting back from reflective areas (32) into the lenses. The reflected light is thus modulated, so that it conveys one bit of the data encoded on the surface. The modulated light reflects from the long pass interference filters, and propagates back through the optical fiber to a demultiplexer (142). In another preferred embodiment, the lenses are omitted. Additional channels may be provided to increase resolution by adding other long pass interference filters and demultiplexer channels.
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Davie James W.
The Boeing Company
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