US 2026/0259473 A1Published application

Optical amplification apparatus and optical amplification method

AssigneeNTT, Inc.

InventorsShimpei SHIMIZU, Takushi KAZAMA, Takayuki KOBAYASHI, Takeshi UMEKI, Yutaka MIYAMOTO

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Abstract

An optical amplification apparatus includes a polarization demultiplexing unit that demultiplexes signal light into polarization components, a first excitation light multiplexing unit that multiplexes excitation light with each polarization component, a first optical amplification unit that generates an optical parametric amplification process to amplify each polarization component, a first excitation light separation unit that separates the excitation light from each polarization component, an unnecessary band separation unit that removes an unnecessary frequency component from each polarization component, a second excitation light multiplexing unit that multiplexes the separated excitation light with each polarization component, a second optical amplification unit that generates an optical parametric amplification process to amplify each polarization component, a second excitation light separation unit that separates the excitation light from each polarization component, and a polarization multiplexing unit that multiplexes each polarization component, and a band-pass filter unit that removes an unnecessary frequency component from the multiplexed signal light. The first optical amplification unit is in a phase matching state in which amplification gain increases as a frequency is separate from a center frequency, and the second optical amplification unit is in a phase matching state in which amplification gain increases near the center frequency.

Claims6

Dependent claims

An optical amplification apparatus comprising:

a polarization demultiplexer that demultiplexes first signal light into first polarized signal light and second polarized signal light which are two orthogonal polarization components;
a first excitation light multiplexer that multiplexes excitation light with each of the first polarized signal light and the second polarized signal light;
a first optical amplifier that generates an optical parametric amplification process to amplify the first polarized signal light and the second polarized signal light having been multiplexed with the excitation light by the first excitation light multiplexer;
a first excitation light separator that separates the excitation light from each of the first polarized signal light and the second polarized signal light having been amplified by the first optical amplifier;
an unnecessary band separator that removes an unnecessary frequency component from each of the first polarized signal light and the second polarized signal light from which the excitation light has been separated by the first excitation light separator;
a second excitation light multiplexer that outputs a third polarized signal light obtained by multiplexing the first polarized signal light from which the unnecessary frequency component has been removed by the unnecessary band separator and the excitation light having been separated from the first polarized signal light by the first excitation light separator and outputs a fourth polarized signal light obtained by multiplexing the second polarized signal light from which the unnecessary frequency component has been removed by the unnecessary band separator and the excitation light having been separated from the second polarized signal light by the first excitation light;
a second optical amplifier that generates an optical parametric amplification process to amplify the third polarized signal light and the fourth polarized signal light having been multiplexed with the excitation light by the second excitation light multiplexer;
a second excitation light separator that separates the excitation light from each of the third polarized signal light and the fourth polarized signal light having been amplified by the second optical amplifier;
a polarization multiplexer unit that outputs second signal light obtained by multiplexing the third polarized signal light and the fourth polarized signal light from which the excitation light has been separated by the second excitation light separator;
and
a band-pass filter unit that removes an unnecessary frequency component from the second signal light output from the polarization multiplexer,
wherein the first optical amplifier is in a phase matching state in which amplification gain becomes larger as a frequency is separate from a center frequency that is ½ of a frequency of the excitation light, and
the second optical amplifier is in a phase matching state in which amplification gain increases near the center frequency.

10 more elements

An optical amplification method comprising:

demultiplexing first signal light into first polarized signal light and second polarized signal light which are two orthogonal polarization components;
a multiplexing excitation light with each of the first polarized signal light and the second polarized signal light;
generating a first optical parametric amplification process to amplify the first polarized signal light and the second polarized signal light having been multiplexed with the excitation light;
separating the excitation light from each of the first polarized signal light and the second polarized signal light having been amplified in the first optical parametric amplification process;
removing an unnecessary frequency component from each of the first polarized signal light and the second polarized signal light from which the excitation light has been separated;
outputting a third polarized signal light by multiplexing the first polarized signal light from which the unnecessary frequency component has been removed and the excitation light having been separated from the first polarized signal light and outputting a fourth polarized signal light by multiplexing the second polarized signal light from which the unnecessary frequency component has been removed and the excitation light having been separated from the second polarized signal light;
generating a second optical parametric amplification process to amplify the third polarized signal light and the fourth polarized signal light;
separating the excitation light from each of the third polarized signal light and the fourth polarized signal light having been amplified in the second optical parametric amplification process;
outputting second signal light obtained by multiplexing the third polarized signal light and the fourth polarized signal light from which the excitation light has been separated;
and
removing an unnecessary frequency component from the second signal light,
wherein in the first optical parametric amplification process, the first polarized signal light and the second polarized signal light are amplified in a phase matching state in which amplification gain becomes larger as a frequency is separate from a center frequency that is ½ of a frequency of the excitation light, and
in the second optical parametric amplification process, the third polarized signal light and the fourth polarized signal light are amplified in a phase matching state in which amplification gain increases near the center frequency.

10 more elements

Dependencies are inferred from the claim text.