Optical signal amplification apparatus and method

1 . An optical signal amplification apparatus, applied to a space-division multiplexing (SDM) transmission system, wherein the optical signal amplification apparatus comprises:

a power detector configured to:

separately detect, for each of a plurality of N spatial dimensions, power of each of a plurality of G wavelength channels to obtain power detection information; and

determine power configuration information based on the power detection information;

an SDM multiplexer configured to generate, in the SDM transmission system, an SDM signal comprising the plurality of N spatial dimensions, wherein each spatial dimension comprises the plurality of G wavelength channels, wherein N is a positive integer, and wherein G is a positive integer;

a pump controller configured to:

receive the power configuration information from the power detector;

output N channels of pump light, wherein each of the N channels includes M pieces of split pump light of different wavelengths, wherein a proportion of each of the M pieces is based on the power configuration information, and wherein M is an integer greater than 1; and

adjust, for each of the N spatial dimensions, the proportions of the M pieces of split pump light based on the power configuration information; and

a Raman amplifier configured to perform Raman amplification on the SDM signal in all of the plurality of N spatial dimensions using the N channels of pump light.

2 . The optical signal amplification apparatus of claim 1 , wherein the pump controller comprises:

M pump light sources of different wavelengths and configured to generate the M pieces of split pump light;

M optical splitters, wherein each optical splitter of the M optical splitters comprises one input port and N output ports; and

N optical multiplexers configured to output the N channels of pump light, wherein each optical multiplexer of the N optical multiplexers comprises an output port,

wherein each pump light source of the M pump light sources is connected to the input port of one optical splitter of the M optical splitters,

wherein the N output ports of each optical splitter of the M optical splitters are connected to one output port in the N optical multiplexers,

wherein each optical splitter of the M optical splitters is configured to:

split pump light of a corresponding wavelength based on a first splitting coefficient; and

output N pieces of split pump light through the N output ports, wherein the N pieces of split pump light arrive at the N optical multiplexers, respectively,

wherein each optical multiplexer of the N optical multiplexers is configured to perform, based on a second splitting coefficient, beam combining on the M pieces of split pump light obtained from the M optical splitters in order to obtain one channel of pump light, and

wherein at least one of the first splitting coefficient or the second splitting coefficient is determined based on the power configuration information.

3 . The optical signal amplification apparatus of claim 2 , wherein the M optical splitters are tunable optical splitters, and wherein the first splitting coefficient corresponding to each tunable optical splitter is based on the power configuration information.

4 . The optical signal amplification apparatus of claim 2 , wherein the M optical splitters are uniform optical splitters, wherein the first splitting coefficient corresponding to each uniform optical splitter is based on equally splitting pump light of a corresponding wavelength, and wherein the second splitting coefficient is based on the power configuration information.

5 . The optical signal amplification apparatus of claim 4 , wherein the N optical multiplexers are configured to implement the second splitting coefficient by using a wavelength selective switch or an optical cross-connect device.

6 . The optical signal amplification apparatus of claim 1 , wherein the power detector is further configured to determine the power configuration information based on the power detection information by determining the power configuration information based on the power detection information according to a power flatness criterion.

7 . The optical signal amplification apparatus of claim 1 , wherein the power detector comprises:

a spatial channel separator configured to separate the SDM signal in the plurality of N spatial dimensions; and

a wavelength channel power detector configured to:

separate the plurality of G wavelength channels in each spatial dimension; and

detect a power of each wavelength channel.

8 . The optical signal amplification apparatus of claim 1 , further comprising a first optical splitter configured to separate the SDM signal from an SDM fiber link, wherein the first optical splitter is connected to the power detector.

9 . The optical signal amplification apparatus of claim 1 , wherein the Raman amplifier comprises:

an SDM fiber configured to:

transmit the SDM signal; and

stimulate Raman amplification on the SDM signal in response to the N channels of pump light; and

an SDM configured to couple the N channels of pump light to the SDM fiber.

10 . The optical signal amplification apparatus of claim 1 , wherein the optical signal amplification apparatus is applied to a few-mode fiber transmission system, wherein the optical signal amplification apparatus further comprises N phase plates disposed between the pump controller and the Raman amplifier, wherein the N phase plates are configured to load, to corresponding modes, the N channels of pump light output by the pump controller, and wherein the N spatial dimensions are N modes.

11 . The optical signal amplification apparatus of claim 1 , wherein the optical signal amplification apparatus is applied to a multi-core fiber transmission system, wherein the optical signal amplification apparatus further comprises a multi-core fan-in module disposed between the pump controller and the Raman amplifier, wherein the multi-core fan-in module is configured to inject, into corresponding fiber cores, the N channels of pump light output by the pump controller, and wherein the N spatial dimensions are N fiber cores.

12 . An optical signal amplification method comprising:

separately detecting, for each of a plurality of N spatial dimensions, power of each of a plurality of G wavelength channels to obtain power detection information;

generating, in a space-division multiplexed (SDM) transmission system, an SDM signal comprising the plurality of N spatial dimensions, wherein each spatial dimension comprises the plurality of G wavelength channels, wherein N is a positive integer, and wherein G is a positive integer;

determining power configuration information based on the power detection information;

outputting N channels of pump light, wherein each of the N channels includes M pieces of split pump light of different wavelengths, and wherein a proportion of each of the M pieces is based on the power configuration information;

adjusting, for each of the N spatial dimensions, the proportions of the M pieces of split pump light based on the power configuration information; and

performing Raman amplification on the SDM signal in all of the N spatial dimensions using the N channels of pump light.

13 . The optical signal amplification method of claim 12 , further comprising:

obtaining the M pieces of split pump light in each channel of pump light through beam combining based on a second splitting coefficient; and

obtaining each piece of split pump light by splitting pump light of a corresponding wavelength based on a first splitting coefficient,

wherein at least one of the first splitting coefficient or the second splitting coefficient is based on the power configuration information.

14 . The optical signal amplification method of claim 13 , wherein determining the power configuration information based on the power detection information comprises determining the power configuration information according to a power flatness criterion.

15 . The optical signal amplification method of claim 12 , wherein the method is applied to a few-mode fiber transmission system and further comprises loading the N channels of pump light to corresponding modes, where the N spatial dimensions are N modes.

16 . The optical signal amplification method of claim 12 , wherein the method is applied to a multi-core fiber transmission system and further comprises injecting the N channels of pump light into corresponding fiber cores, wherein the N spatial dimensions are N fiber cores.

17 . A non-transitory computer-readable storage medium comprising computer-executable instructions that, when executed by a processor, cause an apparatus to:

separately detect, for each of a plurality of N spatial dimensions, power of each of a plurality of G wavelength channels to obtain power detection information;

generate, in a space-division multiplexing (SDM) transmission system, an SDM signal comprising the plurality of N spatial dimensions, wherein each spatial dimension comprises the plurality of G wavelength channels, wherein N is a positive integer, and wherein G is a positive integer;

determine power configuration information based on the power detection information;

output N channels of pump light, wherein each of the N channels includes M pieces of split pump light of different wavelengths, and wherein a proportion of each of the M pieces is based on the power configuration information;

adjust, for each of the N spatial dimensions, the proportions of the M pieces of split pump light based on the power configuration information; and

perform Raman amplification on the SDM signal in all of the N spatial dimensions using the N channels of pump light.

18 . The non-transitory computer-readable storage medium of claim 17 , wherein the instructions, when executed by the processor, further cause the apparatus to:

obtain the M pieces of split pump light in each channel of pump light through beam combining based on a second splitting coefficient; and

obtain each piece of split pump light by splitting pump light of a corresponding wavelength based on a first splitting coefficient,

wherein at least one of the first splitting coefficient or the second splitting coefficient is based on the power configuration information.

19 . The non-transitory computer-readable storage medium of claim 18 , wherein the instructions further cause the apparatus to determine the power configuration information based on the power detection information comprises the instructions further cause the apparatus to determine the power configuration information according to a power flatness criterion.

20 . The non-transitory computer-readable storage medium of claim 17 , wherein the instructions are applied to a few-mode fiber transmission system wherein the instructions further cause the apparatus to load the N channels of pump light to corresponding modes, and wherein the N spatial dimensions are N modes.