Patent ID: 11870205
Assignee: CYBEL, LLC.
Field: Optics (Instruments)
Classification: CPC H | IPC H

Claim 16:
17. A hybrid optical amplifier for operation within an eye-safe wavelength region comprising:
a preamplifier stage including:
a section of single-clad Ho-doped optical fiber, the preamplifier providing gain to an input signal propagating at a wavelength λS within the eye-safe wavelength region; and
a preamplifier pump source providing a pump beam operating at an absorption-dominant pump wavelength λpre where the absorption coefficient of the section of single-clad Ho-doped optical fiber is greater than the gain coefficient of the section of single-clad Ho-doped optical gain fiber, the presence of the pump beam in the section of single-clad Ho-doped optical fiber providing gain to the input signal, generating as an output an intermediate amplified output signal; and

a power amplifier stage disposed at the output of the preamplifier stage and including:
a section of double-clad Tm-doped optical fiber responsive to the intermediate amplified output signal from the preamplifier stage; and
a power amplifier pump source providing a pump beam operating at a waveguide appropriate for generating gain in the presence of Tm ions, the output from power amplifier comprising an amplified version of the incoming optical signal.