Power-efficient dual-rate optical transceiver

Yongrong Zuo, Fouad E. Kiamiley, Xiaoqing Wang, Ping Gui, Jeremy Ekman, Xingle Wang, Michael J. McFadden, Michael W. Haney
2005 Applied Optics  
A dual-rate ͑2 Gbit͞s and 100 Mbit͞s͒ optical transceiver designed for power-efficient connections within and between modern high-speed digital systems is described. The transceiver can dynamically adjust its data rate according to performance requirements, allowing for power-on-demand operation. Dynamic power management permits energy saving and lowers device operating temperatures, improving the reliability and lifetime of optoelectronic-devices such as vertical-cavity surface-emitting lasers
more » ... (VCSELs). To implement dual-rate functionality, we include in the transmitter and receiver circuits separate high-speed and low-power data path modules. The high-speed module is designed for gigabit operation to achieve high bandwidth. A simpler low-power module is designed for megabit data transmission with low power consumption. The transceiver is fabricated in a 0.5 m silicon-on-sapphire complementary metal-oxide semiconductor. The VCSEL and photodetector devices are attached to the transceiver's integrated circuit by flip-chip bonding. A free-space optical link system is constructed to demonstrate correct dual-rate functionality. Experimental results show reliable link operation at 2 Gbit͞s and 100 Mbit͞s data transfer rates with ϳ104 and ϳ9 mW power consumption, respectively. The transceiver's switching time between these two data rates is demonstrated as 10 s, which is limited by on-chip register reconfiguration time. Improvement of this switching time can be obtained by use of dedicated input-output pads for dual-rate control signals.
doi:10.1364/ao.44.007112 pmid:16318182 fatcat:i3mmweyn4rhqjjyyhg7jq2th5y