In this paper, we demonstrate a traveling wave linear modulator for high speed analog optical link applications. A two-section Y-fed directional coupler modulator based on electro-optic polymer is linearized with Δβ -reversal technique to suppress the third-order intermodulation distortions. A traveling wave electrode with low RF loss and excellent velocity matching is designed and demonstrated with the bandwidth-length product of 125 GHz·cm. The 3-dB electrical bandwidth of 10 GHz and the spurious free dynamic range of 110 ± 3 dB/Hz2/3 over the modulation frequency of 2–8 GHz are measured form the fabricated device.
© 2011 IEEE
Beom Suk Lee, Che-Yun Lin, Alan X. Wang, and Ray T. Chen, "Demonstration of a Linearized Traveling Wave Y-Fed Directional Coupler Modulator Based on Electro-Optic Polymer," J. Lightwave Technol. 29, 1931-1936 (2011)