Patent ID: 11880116
Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 12:
13. The method according to claim 8, further comprising:
splitting, by a second splitter, a single light beam into two equal light beams and inputting a first light beam of the two equal light beams to the first splitter;
combining, by a Y-combining optical waveguide, the combined light beam output from the combiner and a second light beam of the two equal light beams output from the second splitter into a second combined light beam and outputting the second combined light beam;
converting, by a photodetector, the second combined light beam output from the Y-combining optical waveguide into an electrical signal; and
adjusting a second phase shifter such that the light beams that are combined by the Y-combining optical waveguide are made in phase.