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TRIDENT (The tRopIcal DEep-sea Neutrino Telescope) is a proposednext-generation neutrino telescope to be constructed in the South China Sea. InSeptember 2021, the TRIDENT Pathfinder experiment (TRIDENT EXplorer, T-REX forshort) was conducted to evaluate the in-situ optical properties of seawater.The T-REX experiment deployed three digital optical modules at a depth of 3420meters, including a light emitter module (LEM) and two light receiver modules(LRMs) equipped with photomultiplier tubes (PMTs) and cameras to detect lightsignals. The LEM emits light in pulsing and steady modes. It features a fasttunable driver to activate light-emitting diodes (LEDs) that emitnanosecond-width light pulses with tunable intensity. The PMTs in the LRMreceive single photo-electron (SPE) signals with an average photon number ofapproximately 0.3 per 1-microsecond time window, which is used to measure thearrival time distribution of the SPE signals. The fast tunable driver can beremotely controlled in real-time by the data acquisition system onboard theresearch vessel, allowing for convenient adjustments to the driver's parametersand facilitating the acquisition of high-quality experimental data. This paperdescribes the requirements, design scheme, and test results of the fast tunabledriver, highlighting its successful implementation in the T-REX experiment andits potential for future deep-sea experiments.

A fast tunable driver of light source for the TRIDENT Pathfinder experiment