US 2026/0074480 A1Published application

Core Pumping High Power Doped Fiber Amplifier Realizing Full Band Gain Flatness

AssigneeII-VI Photonics, Inc.

InventorsChunli Tao, Yongjun Fu, Jianhua Fu

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Abstract

In a method and system for generating high gain and increased output power in a doped fiber amplifier, a first pair of wavelengths of pump laser light are injected into an active optical fiber between an input end and an output end of the active optical fiber in a co-propagating direction, toward the output end of the active optical fiber, as one or more communication wavelengths of signal light from the input end to the output end of the active optical fiber. A second pair of wavelengths of pump laser light are injected into the active optical fiber between the input end and the output end of the active optical fiber in a counter-propagating direction, toward the input end of the active optical fiber, as the one or more communication wavelengths of signal light from the input end to the output end of the active optical fiber.

Claims22

Dependent claims

A method of amplification in an optical fiber having an input end for receiving one or more communication wavelengths of signal light and an output end for outputting the one or more communication wavelengths of signal light, the method comprising:

(a) injecting into the optical fiber, by a first pair of pump lasers, between the input end and the output end of the optical fiber, a first pair of wavelengths of pump laser light in a co-propagating direction, toward the output end of the optical fiber, as the signal light propagating from the input end to the output end of the optical fiber;
and
(b) injecting into the optical fiber, by a second pair of pump lasers, between the input end and the output end of the optical fiber, a second pair of wavelengths of pump laser light in a counter-propagating direction, toward the input end of the optical fiber, as the signal light propagating from the input end to the output end of the optical fiber, wherein:
the first pair of wavelengths of pump laser light includes a first wavelength in a wavelength range between 1470 nm and 1490 nm and a second wavelength in a wavelength range between 968 nm and 982 nm;
and
the second pair of wavelengths of pump laser light includes a third wavelength in a wavelength range between 968 nm and 982 nm and a fourth wavelength in a wavelength range between 1470 nm and 1490 nm.

3 more elements

A system for amplifying one or more communication wavelengths of signal light, the system comprising a booster amplifier including:

an active optical fiber coupled to receive and propagate one or more communication wavelengths of signal light in a downstream direction in the active optical fiber;
a first pair of pump lasers for injecting into the active optical fiber a first pair of wavelengths of pump laser light in the downstream direction in the active optical fiber;
and
a second pair of pump lasers injecting into the active optical fiber a second pair of wavelengths of pump laser light in an upstream direction in the active optical fiber, wherein:
the first pair of wavelengths of pump laser light includes a first wavelength in a wavelength range between 1470 nm and 1490 nm and a second wavelength in a wavelength range between 968 nm and 982 nm;
and
the second pair of wavelengths of pump laser light includes a third wavelength in a wavelength range between 968 nm and 982 nm and a fourth wavelength in a wavelength range between 1470 nm and 1490 nm.

4 more elements

Dependencies are inferred from the claim text.