Backward-flow ladder architecture and method
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United States of America Patent
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Nov 15, 1988
Grant Date -
N/A
app pub date -
Feb 2, 1987
filing date -
Feb 2, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A ladder architecture comprises an input optical fiber bus and an output optical fiber bus. A plurality of input optical couplers couple light between the input bus and a plurality of branching fibers. A plurality of output couplers couple light from the branching fibers to the output bus. The input bus and the branch fibers may be single mode optical fibers while the output bus a multimode optical fiber. The input couplers may be symmetrical, single mode devices, and the output couplers may be asymmetrical and single mode to multimode devices. The input bus may also be a multimode fiber, and the input couplers may also be multimode to single mode devices. The asymmetrical coupling reduces the amount of signal lost at fiber ends.
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