Apparatus and method for upgrading a narrow-band optical communication system to a system with wide spectral band optical amplification
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United States of America Patent
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Issued Date -
May 19, 2005
app pub date -
Jul 20, 2004
filing date -
Nov 17, 2003
priority date (Note) -
Abandoned
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Abstract
An apparatus for optical amplification that imparts gain properties found in wide-band optical amplifiers to a narrow-band optical amplifier, specifically an Erbium doped fiber amplifier (EDFA). In one preferred embodiment, the apparatus comprises an EDFA and an externally attachable (to the EDFA) module that includes a single un-pumped Erbium doped fiber (EDF) connected to a gain flattening filter (GFF). The GFF may be internal or external to the module. In another embodiment, the apparatus comprises an EDFA and an externally attachable module having a plurality of un-doped EDFs with different lengths, switchably connectable to the GFF and to the EDFA to provide the required wide-band gain properties.
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