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Abstract-Peripheral coupled waveguide (PCW) design has been deployed in InGaAsP multiple quantum-well (MQW) electroabsorption modulator (EAM) at 1.55-m wavelength. PCW enhances the optical saturation power and reduces the optical insertion loss and the equivalent V simultaneously. A radio-frequency link using a 1.3-mm-long lumped-element PCW EAM has achieved experimentally a link gain of 3 dB, at 500 MHz and at input optical power of 80 mW. The corresponding two-tone multioctave spurious-free dynamic range (SFDR) at the same bias is measured at 118 dB Hz 2 3 . The single-octave SFDR at the third-order null bias is 132 dB Hz 4 5 . Index Terms-Electroabsorption modulator (EAM), peripheral coupled waveguide (PCW), radio-frequency (RF) link gain, spurious-free dynamic range (SFDR).