Optical: systems and elements – Optical amplifier – Optical fiber
Patent
1997-04-22
1998-03-24
Moskowitz, Nelson
Optical: systems and elements
Optical amplifier
Optical fiber
359177, 372 6, H01S 313, G02B 600
Patent
active
057318921
ABSTRACT:
Multistage Er-doped fiber amplifiers (EDFAs) are disclosed. They comprise a first stage that comprises Er and Al, and further comprise a second stage that comprises Er and a further rare earth element, exemplary Yb. Such multistage EDFAs can have advantageous characteristics e.g., a relatively wide flat gain region (e.g. 1544-1562 nm), and relatively high output power, without significant degradation of the noise figure. Exemplary, the amplifiers are used in WDM systems and in analog CATV systems.
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DiGiovanni David John
Park Namkyoo
Womack Kim Willard
Wysocki Paul Francis
Lucent Technologies - Inc.
Moskowitz Nelson
Pacher Eugen E.
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