US 12,147,097 B2
Optical modulator and optical transmission apparatus using same
Norikazu Miyazaki, Tokyo (JP); and Toru Sugamata, Tokyo (JP)
Assigned to SUMITOMO OSAKA CEMENT CO., LTD., Tokyo (JP)
Appl. No. 17/764,022
Filed by SUMITOMO OSAKA CEMENT CO., LTD., Tokyo (JP)
PCT Filed Sep. 15, 2020, PCT No. PCT/JP2020/034974
§ 371(c)(1), (2) Date Mar. 25, 2022,
PCT Pub. No. WO2021/060087, PCT Pub. Date Apr. 1, 2021.
Claims priority of application No. 2019-175516 (JP), filed on Sep. 26, 2019.
Prior Publication US 2022/0342241 A1, Oct. 27, 2022
Int. Cl. G02F 1/03 (2006.01); G02F 1/01 (2006.01); G02F 1/035 (2006.01)
CPC G02F 1/0327 (2013.01) [G02F 1/0115 (2013.01); G02F 1/0316 (2013.01); G02F 1/035 (2013.01)] 8 Claims
OG exemplary drawing
 
1. An optical modulator comprising:
an optical modulation element that is configured to generate two modulated light beams, each of which is modulated by two sets of electrical signals, each set including two electrical signals, and 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 are accommodated,
wherein each of the plurality of signal conductor patterns include at least one parts mounting part including an electrical circuit element,
in the relay substrate, each of the two sets of electrical signals is propagated by each of two pairs of signal conductor patterns each formed by two adjacent signal conductor patterns of the plurality of signal conductor patterns,
the two adjacent signal conductor patterns, of the plurality of signal conductor patterns, constituting at least one pair of signal conductor patterns among the two pairs of signal conductor patterns are configured such that first signal propagation directions, which are signal propagation directions at the parts mounting parts, point in different directions away from each other.