Signal Integrity Design For QSFP interface applicated in RF Optical transmitter Module

The QSFP interface is used as the input port in the design of 4*10GHz optical transmitter module. It will inevitably lead to impedance mismatch, resonance and signal distortion. Using the three-step optimization, in DC-10GHz bandwidth, the insertion loss S21 is greater than -2dB, and the echo loss S11 is less than -10dB, the S-parameter resonances were largely mitigated. Finally, The whole schematic link of transmitter module with the optimized QSFP interface is modeled and simulated by ADS, the gain flatness of the transmission link is within ±4dB, and shows that the optimized QSFP interface has a perfect electrical performance in the optical transmitter module.