We present the design and test results of two optical
data transmission ASICs for the High-Luminosity LHC (HL-LHC) experiments.
These ASICs include a two-channel serializer (LOCs2) and a single-channel
Vertical Cavity Surface Emitting Laser (VCSEL) driver (LOCld1V2). Both ASICs
are fabricated in a commercial 0.25-μm Silicon-on-Sapphire (SoS) CMOS
technology and operate at a data rate up to 8 Gbps per channel. The power
consumption of LOCs2 and LOCld1V2 are 1.25 W and 0.27 W at 8-Gbps data rate,
respectively. LOCld1V2 has been verified meeting the radiation-tolerance
requirements for HL-LHC experiments.