Ultra-wide bandwidth fiber based optical amplifier
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United States of America Patent
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Oct 23, 2001
Grant Date -
N/A
app pub date -
Oct 4, 1999
filing date -
Oct 4, 1999
priority date (Note) -
Expired
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Abstract
An ultra-wide bandwidth optical amplifier for the 1.5 .mu.m optical band divides the 1520 nm-1610 nm bandwidth into three narrow bandwidths, i.e. C1 (1520 nm-1541 nm), C2 (1541 nm-1565 nm) and L (1565 nm-1610 nm), and uses three separate erbium doped fiber amplifier blocks, configured in parallel relation and individually optimized to separately amplify the respective bandwidth. Multipath interference is controlled by constructing all three amplifier blocks with the same optical transmission length. The C1 and C2 band amplifier blocks, which include shorter erbium doped fibers than the L band amplifier block, are physically lengthened using lengths of single mode fiber so that the total length of the optical transmission path of each amplifier block is generally equal. Fiber lengths are controlled to within 500 microns. Selected amplifier blocks further include delay control devices which selectively delay signals passing through the respective amplifier block to provide fine adjustment to signal recombination.
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