Patent ID: 11914189
Assignee: FUJITSU OPTICAL COMPONENTS LIMITED
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 11:
12. An optical communication apparatus comprising:
a processor that executes signal processing on an electrical signal;
a light source that generates light; and
an optical device that modulates, by using the electrical signal that is output from the processor, the light generated from the light source, wherein
the optical device includes
an input unit that inputs an optical signal,
a plurality of first silicon (Si) optical waveguides that split and output the optical signal received from the input unit,
a plurality of LN (LiNbO3) optical waveguides that are included in a LN modulator and that transmit the optical signals that are split and output by the first Si optical waveguides,
a plurality of second Si optical waveguides that multiplex and output optical signals that are output from the plurality of respective LN optical waveguides,
an output unit that outputs the optical signal multiplexed by the second Si optical waveguides, and
a plurality of Mach-Zehnder interferometers that are disposed on optical waveguides connected by the first Si optical waveguides, the LN optical waveguides, and the second Si optical waveguides, respectively, and

when there are differences among waveguide lengths of the LN optical waveguides, optical waveguides for the respective Mach-Zehnder interferometers are configured so as to equalize optical path lengths by adjusting an effective refractive index and a waveguide length inside at least one of the optical waveguides.