Patent ID: 11953767
Assignee: SUMITOMO OSAKA CEMENT CO., LTD.
Field: Optics (Instruments)
Classification: CPC G  H | IPC G

Claim 0:
1. An optical modulator comprising:
an optical modulation element that includes a plurality of signal electrodes;
a plurality of signal input terminals each of which inputs an electrical signal to be applied to each of the signal electrodes;
a relay substrate on which a plurality of signal conductor patterns that electrically connect the signal input terminals to the signal electrodes, and a plurality of ground conductor patterns are formed; and
a housing in which the optical modulation element and the relay substrate accommodated,
wherein at least one signal conductor pattern includes at least one component mounting portion including an electrical circuit element,
two ground conductor patterns sandwiching the at least one signal conductor pattern on the relay substrate are formed in an asymmetrical shape in a plan view within a component mounting area having a square shape in the plan view centered on the component mounting portion, with respect to a straight line extending in an extending direction of the at least one signal conductor pattern in the component mounting portion, and
a direction of a side of the component mounting area having the square shape is same as the extending direction of the at least one signal conductor pattern in the component mounting portion and a length of a side of the component mounting area is equal to a distance from a center of the component mounting portion to a portion on an adjacent signal conductor pattern closest to the center.