US 11,929,784 B2
Wavelength dispersion compensation apparatus and wavelength dispersion compensation method
Shimpei Shimizu, Musashino (JP); Takushi Kazama, Musashino (JP); Takayuki Kobayashi, Musashino (JP); and Yutaka Miyamoto, Musashino (JP)
Assigned to NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo (JP)
Appl. No. 17/797,266
Filed by NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo (JP)
PCT Filed Feb. 12, 2020, PCT No. PCT/JP2020/005314
§ 371(c)(1), (2) Date Aug. 3, 2022,
PCT Pub. No. WO2021/161411, PCT Pub. Date Aug. 19, 2021.
Prior Publication US 2023/0059003 A1, Feb. 23, 2023
Int. Cl. H04B 10/2507 (2013.01); H04B 10/2513 (2013.01); H04B 10/2525 (2013.01); H04B 10/61 (2013.01)
CPC H04B 10/2525 (2013.01) [H04B 10/2507 (2013.01); H04B 10/2513 (2013.01); H04B 10/6161 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A wavelength dispersion compensating apparatus, comprising:
a signal light generating unit which generates, from predetermined signal light, signal light having a phase correlation centered on a degenerate frequency of a phase sensitive amplifier;
a dispersion compensation transmission path which compensates for a wavelength dispersion of the predetermined signal light included in the signal light;
a filter which compensates for a residual wavelength dispersion after compensation by the dispersion compensation transmission path of the predetermined signal light included in the signal light;
a phase sensitive amplifier which amplifies the signal light input via the dispersion compensation transmission path and the filter;
a residual wavelength dispersion calculating unit which calculates a residual wavelength dispersion amount based on a measurement result of output light amplified by the phase sensitive amplifier; and
a filter control unit which controls the filter so as to add a wavelength dispersion that cancels out the calculated residual wavelength dispersion amount to the predetermined signal light.