Apparatus and method for upgrading a narrow band optical...

Details Apparatus and method for upgrading a narrow band optical... Apparatus and method for upgrading a narrow band optical...

2006-04-04

2006-04-04

Hellner, Mark (Department: 3663)

Optical: systems and elements

Optical amplifier

Correction of deleterious effects

Reexamination Certificate

active

07023612

ABSTRACT:
An apparatus for optical amplification that imparts to a narrow band optical amplifier, specifically an Erbium dope fiber amplifier (EDFA), gain properties found in wide band optical amplifiers. 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 the EDFA to provide the required wide-band gain properties.

REFERENCES:
patent: 6396624 (2002-05-01), Nissov et al.

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