Optical: systems and elements – Optical amplifier – Optical fiber
Reexamination Certificate
2005-01-18
2005-01-18
Hellner, Mark (Department: 3663)
Optical: systems and elements
Optical amplifier
Optical fiber
C385S127000
Reexamination Certificate
active
06844962
ABSTRACT:
A source that employs an Erbium-Doped Fiber Amplifier (EDFA) for generating light in an S-band of wavelengths. The EDFA uses a fiber having a core with a core cross section surrounded by a depressed cladding with a depressed cladding cross section and a secondary cladding with a secondary cladding cross section. A pump source is provided for pumping the Erbium contained in the core of the fiber to a high relative inversion D, such that the Erbium exhibits positive gains in the S-band and high gains in a long wavelength band longer than the S-band. The core cross-section, the depressed cladding cross-section, and the refractive indices no, n1, and n2are selected to produce losses at least comparable to the high gains in the long wavelength band and losses substantially smaller than the positive gains in the S-band. The source uses the amplified spontaneous emission (ASE) produced by the EDFA to generate broadband light and/or narrowband light with the aid of a wavelength selecting mechanism that selects an output wavelength of the light within the ASE emission spectrum of the EDFA.
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Arbore Mark A.
Kmetec Jeffrey D.
Zhou Yidong
Hellner Mark
Lightwave Electronics
Lumen Intellectual Property Services Inc.
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