US 12,034,269 B2
Light amplifying relay system
Takayuki Mizuno, Tokyo (JP); Koki Shibahara, Tokyo (JP); Akira Isoda, Tokyo (JP); Takayuki Kobayashi, Tokyo (JP); and Yutaka Miyamoto, Tokyo (JP)
Assigned to NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo (JP)
Appl. No. 17/258,408
Filed by NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo (JP)
PCT Filed Jul. 5, 2019, PCT No. PCT/JP2019/026852
§ 371(c)(1), (2) Date Jan. 6, 2021,
PCT Pub. No. WO2020/013096, PCT Pub. Date Jan. 16, 2020.
Claims priority of application No. 2018-132530 (JP), filed on Jul. 12, 2018.
Prior Publication US 2021/0296847 A1, Sep. 23, 2021
Int. Cl. H01S 3/067 (2006.01); H01S 3/094 (2006.01); H01S 3/10 (2006.01); H01S 3/30 (2006.01); H04B 10/2581 (2013.01); H04B 10/291 (2013.01); H04B 10/293 (2013.01); H04J 14/04 (2006.01)
CPC H01S 3/30 (2013.01) [H01S 3/06737 (2013.01); H01S 3/06779 (2013.01); H01S 3/094007 (2013.01); H01S 3/10015 (2013.01); H04B 10/2581 (2013.01); H04B 10/2916 (2013.01); H04B 10/293 (2013.01); H04J 14/04 (2013.01)] 7 Claims
OG exemplary drawing
 
1. An optical amplifier repeater system comprising:
an optical fiber configured to propagate a light beam in a plurality of propagation modes; and
an optical amplifier repeater configured to amplify the light beam,
wherein the optical amplifier repeater includes
an optical demultiplexer configured to demultiplex the light beam in the plurality of propagation modes propagated through the optical fiber into a plurality of single-mode light beams,
an optical amplifier configured to amplify, by simultaneous pumping, intensities of the plurality of single-mode light beams using a light beam generated by one pumping light source,
an optical multiplexer configured to multiplex the plurality of single-mode light beams amplified by the optical amplifier into a light beam in the plurality of propagation modes, and
an optical intensity adjuster configured to adjust the intensity of each of the plurality of single-mode light beams at least one of before or after the amplification by the optical amplifier,
wherein the optical intensity adjuster performs the adjustment by amplifying or attenuating the optical intensity of each of the plurality of single-mode light beams in an individual optical path through which the single-mode light beam is propagated
the optical amplifier includes a plurality of input ports to each of which one of the plurality of single-mode light beams is input, and
the optical demultiplexer, to reduce variations in the optical intensity after the amplification by the optical amplifier,
outputs, from each of a plurality of output ports, the plurality of single-mode light beams demultiplexed, and
inputs the plurality of single-mode light beams output from each of the plurality of output ports by switching to an input port which is different from another input port of the optical amplifier, the switching being performed in accordance with the plurality of single-mode light beams.