| 摘要 |
PROBLEM TO BE SOLVED: To downsize a package of an optical modulator in the optical modulator and an optical transmitter.SOLUTION: An optical modulator 1 is configured to house a first substrate 3 and a second substrate 4 different from the first substrate 3 in a package 2, and has a flexible circuit substrate 5 outside the package 2. In the first substrate 3, a plurality of optical modulators 6 and 7 is juxtaposed that has a Mach-Zehnder type optical waveguide. In the second substrate 4, a plurality first signal lines 51 and 52 is provided that corresponds to each of the optical modulators 6 and 7, respectively. In the flexible circuit substrate 5, a plurality of second signal lines 61 and 62 is provided that corresponds to each of the optical modulators 6 and 7, respectively. An electric length of each of the second signal lines 61 and 62 is mutually different. An electric length of a signal path is mutually equal that reaches origins P, Pon signal electrodes 14 and 24 via the first signal lines 51 and 52 from input terminals 63 and 64 of the second signal lines 61 and 62 respectively corresponding to each of the optical modulators 6 and 7. |
