Fiber amplifiers with depressed cladding and their uses in...

Details Fiber amplifiers with depressed cladding and their uses in... Fiber amplifiers with depressed cladding and their uses in...

2005-06-21

2005-06-21

Hellner, Mark (Department: 3663)

Optical: systems and elements

Optical amplifier

Optical fiber

Reexamination Certificate

active

06909538

ABSTRACT:
A fiber amplifier in a depressed cladding or W-profile fiber. The fiber has a core doped with the active material and defined by a core cross-section and a refractive index no. A depressed cladding of index n1surrounds the core and a secondary cladding of index n2surrounds the depressed cladding. The fiber amplifier is pumped to a level of high relative inversion, such that the active material exhibits positive gains in a short wavelength band and high gains in a long wavelength band. The core cross-section, the depressed cladding cross-section and the refractive indices no, n1, and n2are selected to obtain a roll-off loss curve about a cutoff wavelength λc. The roll-off loss curve yields losses at least comparable to the high gains in the long wavelength band and losses substantially smaller than the positive gains in the short wavelength band.

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