What are voltages VD and VL in the schematic and what are approximate current consumptions from VD, VL and 3.3VD?
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VL refers to the voltage supplied to the laser. VD referes to the voltage supplied to everything else in the circuit.
Additional details on power consumption can be inferred in the following document. http://www.ti.com/lit/ug/tiduc73b/tiduc73b.pdf
Reference section 184.108.40.206 Laser Driver on page 16.