Future silicon trackers will be operated in an intense radiation environment and require large volume of data to be transmitted off detector. In addition, the optical modules must be of low mass in order to limit multiple scattering and nuclear interactions that would degrade the overall performance of the detector. We will present a miniature optical engine that satisfies these constraints. The optical engine consists of two miniature connectors, an electrical connector and a MT ferrule. The “brain” of the optical engine consists of an ASIC driving a VCSEL (Vertical Cavity Surface Emitting Laser) array in an optical package. This intelligent part of the optical engine is relatively small in comparison. The ASIC is designed to operate a 12-channel VCSEL array at 5 Gb/s per channel, which yields a total bandwidth of 60 Gb/s. The ASIC is designed using only core transistors in a 65 nm CMOS process to enhance the radiation-hardness. The ASIC contains a DAC to control the bias and modulation currents of the individual channels in the VCSEL array. Each channel also contains pre-emphasis and equalization circuits so that the ASIC can restore the highly distorted electrical signal after propagating through several meters of small gauge wires (“skinny wires”). The pre-emphasis and equalization are programable via a DAC. The DAC settings are stored in SEU (single event upset) tolerant registers. The results of the optical engine will be presented at the conference.
|Submission declaration||Original and unpublished|