The circuit that allows for triangular wave modulation of the VCSEL drive current. The corresponding  block diagram of the circuit scheme that drives the VCSEL is given below the drive circuit.

 
  Part of: Sabuncu M, Yilmazlar İ (2016) Speckle Contrast Reduction with a Visible VCSEL Projector. Research Ideas and Outcomes 2: e9597. https://doi.org/10.3897/rio.2.e9597