Optical waveguides – Optical fiber waveguide with cladding
Reexamination Certificate
2005-11-29
2005-11-29
Lee, John R. (Department: 2881)
Optical waveguides
Optical fiber waveguide with cladding
C385S144000, C359S341100
Reexamination Certificate
active
06970631
ABSTRACT:
A fiber amplifier in which the active core is surrounded by a cladding and coupling of radiation between a core mode and cladding modes is suppressed to minimize cladding mode losses in a short wavelength range. An index profile is established in the active core and in the cladding such that the core exhibits a loss above a cutoff wavelength λcand positive gains in the short wavelength range below the cutoff wavelength λc. Suppression of cladding mode losses is achieved by an arrangement for suppressing the coupling of radiation in the short wavelength range between a core mode supported the active core and a cladding mode supported by the cladding. The arrangement for suppressing can include an absorbing material or a scattering material distributed in the cladding. The arrangement for suppressing can include a non-phase-matched length section of the fiber amplifier in which the core mode and the cladding modes are not phase matched.
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Johnston Phillip A.
Lee John R.
Lightwave Electronics
Lumen Intellectual Property Sciences, Inc.
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