A Very High-Dense on-Board Optical Module Realizing >1.3 Tb/s/Inch ^2

We demonstrate >1.3-Tb/s VCSEL-based on-board optical module for high-density optical interconnects. The optical module integrates 28-Gb/s × 24-channel transmitter and receiver into one package of 1-inch^2 footprint. Subsequently, the total data rate is as high as 1.34 Tb/s. As investigated the temperature distributions of an optical module in calculation and experiment, an operating case temperature of optical module is lower than the maximum case temperature of 70 degree C in a practical air-cooling environment with the total power consumption of 9.1 W when activating all CDR circuitries as the harshest condition. The module exhibits a total jitter margin of 0.48 U. I. at a BER of 10^-12 when operated by a 28.05-Gb/s NRZ PRBS bit stream for each channel. By bypassing CDR circuitries with a capable length of electrical transmission line of 30 mm, a jitter margin was degraded to 0.21 U. I. at a case temperature of 70 degree C. If a system accepts such a level of jitter margin, the total power consumption can be suppressed to 6.0 W and an operating case temperature can be decreased accordingly.