Cryogenic electro-optic modulators have promising applications in cryogenic optical interconnects for superconducting computing systems. Because of lithium niobate’s high Pockels coefficient, lithium niobate Mach-Zehnder modulators can achieve low half-wave voltage and high-speed data transmission when combined with superconducting traveling-wave electrodes. In this paper, a high-performance and scalable bent superconducting traveling-wave electrode is designed and fabricated using an asymmetric coplanar waveguide (ACPW) transmission line. By introducing unequal ground gaps on the two sides of the signal line, the proposed ACPW structure concentrates the electric field toward the narrower-gap side, yielding an approximately 90% enhancement in central electric field intensity compared with conventional symmetric designs, which is expected to improve modulation efficiency. Within a limited chip area, a circular bent transmission-line geometry is implemented. SU-8 photoresist dielectric bridges are employed to suppress discontinuities and parasitic mode conversion in the bent regions, significantly enhancing high-frequency signal integrity. The high-frequency performance of the fabricated ACPW is characterized at cryogenic temperatures using a cryogenic probe station. Measurement results demonstrate that the dielectric bridges effectively suppress parasitic resonances induced by impedance discontinuities in the bent regions, improving the 3 dB electrical bandwidth from 9 GHz to 59 GHz at 4.2 K. The dielectric-bridge fabrication process demonstrated in this work is applicable to other superconducting device platforms.