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

Claim 5:
6. The optical digital-to-analog converter according to claim 1, further comprising:
a second splitter configured to split a single light beam into two equal light beams and input a first light beam of the two equal light beams to the first splitter;
a Y-combining optical waveguide configured to combine 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 output the second combined light beam;
a photodetector configured to convert the second combined light beam output from the Y-combining optical waveguide into an electrical signal; and
a second phase shifter configured to be adjustable such that the light beams that are combined by the Y-combining optical waveguide are made in phase.