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Development of optical links with 850 nm multi-mode vertical-cavitysurface-emitting lasers (VCSELs) has advanced to 25 Gbps in speed. Forapplications in high-energy experiments, the transceivers are required to betolerant in radiation and particle fields. We report on prototyping of aminiature transmitter named MTx+, which is developed for high speedtransmission with the dual-channel laser driver LOCld65 and 850 nm VCSELspackaged in TOSA format. The LOCld65 is fabricated in the TSMC 65 nm processand is packaged in the QFN-40 for assembly. The MTx+ modules and test kits werefirst made with PCB and components qualified for 10 Gbps applications, and weretested for achieving 14 Gbps. The data transfer rate of the MTx+ module isinvestigated further for the speed of up to 25 Gbps. The LOCld65 is examinedwith post-layout simulation and the module design upgraded with componentsincluding the TOSA qualified for 25 Gbps applications. The PCB material isreplaced by the Panasonic MEGTRON6. The revised MTx+ is tested at 25 Gbps andthe eye-diagram shows a mask margin of 22 %.

Prototyping of a 25 Gbps optical transmitter for applications in high-energy physics experiments