Patent ID: 11881893
Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. An optical communication system comprising:
a dispersion compensation module, the dispersion compensation module including:
a dispersion compensation optical fiber, the dispersion compensation optical fiber having a negative dispersion value in an anomalous dispersion region corresponding to a longer wavelength side than a zero-dispersion wavelength of a transmission optical fiber disposed between an OLT (Optical Line Terminal) and an ONU (Optical Network Unit); and
an asymmetrical optical splitter, the asymmetrical optical splitter including:
one merge port to which the dispersion compensation optical fiber is connected;
N split ports (N is an integer of 2 or more) to which an optical network including one or a plurality of the ONUs is connected; and
N−1 split portions that split light from two first ports on a side of the merge port to two second ports on a side of the split port at a predetermined split ratio,
wherein the split portions are connected so that one of the second ports is connected to one of the split ports and the other of the second ports is connected to one of the first ports of the split portion of a next stage, and
the split portion of a first stage of the split portions has one of the first ports connected to the merge port, and the split portion of a final stage has the second ports connected to the split port,

wherein the dispersion compensation optical fiber has a first wavelength dependence property in which a first dispersion value with respect to a peak wavelength at the other of the first ports of the split portion of the first stage is negative, and
the transmission optical fiber has a second wavelength dependence property in which a second dispersion value at the peak wavelength at the other of the first ports of the split portion of the first stage is positive.