Yes, R20 is a "damping resistor" whose value can be changed for better impedance matching with laser diode. The typically value of damping resistor varies from 18Ω to 23Ω.
Yes, R20 is a "damping resistor" whose value can be changed for better impedance matching with laser diode. The typically value of damping resistor varies from 18Ω to 23Ω.