A 9pJ/bit SOP optical transceiver with 80 Gbps two-way bandwidth

The high-speed parallel optical transmitter module based on VCSEL/PD array, high-speed specialized integrated circuit, fiber array micro-optical components presents magnificent application and development potential. The coupling alignment between VCSEL/PD array and waveguide array has been reported using silicon optical bench (SiOB) [1-3]. In this paper, A passive coupling method based on SiOB and the packaging of the VCSEL/PD arrays are introduced; the coupling efficiency is about 80% with a misalignment tolerance of +/-15μm, optical cross talk is about -70dB. A silicon optical bench is fabricated as a platform for integrated photonic components. The thermal performance and electrical performance of optical sub-package is analyzed and optimized. A High density SOP Optical Transceiver is designed based on this coupling method. Signal integrity analysis and optimization of the high-density differential signal pairs on PCB is conducted and S parameters are extracted to optimize impedance and minimize the effects of discontinuity in the electrical channels. In addition, to suppress simultaneous switching noise (SSN) and optimize the target impedance, a novel embedded capacitor filter is used instead of the conventional power supply filter, the film capacitor measures 14μm in thickness, has a dielectric constant of 16 and a capacitance density of InF/cm². The transceiver loop back diagram is shown; the bit error rate of the optical transceiver is tested loop back with a 2³¹-1 PRBS pattern and found to be 10^-12s^-1 at 10Gbps while dissipating 90m W/channel.