The following is described on page 20 of the data sheet.
-------------------------------------------------- -------------------------------------------------- ---------
The output stage of the ONET4211LD is optimized for driving a 20-Ω The combination of a damping diode, RD,
along with the resistance of the laser diode, must be 20 Ω for impedance matching.
The suggested typical value for RD is 6 Ω to 15 Ω. A bypass capacitor of 10 nF placed close to the laser diode also helps to optimize performance.
-------------------------------------------------- -------------------------------------------------- ---------
About the above Between IC pin 16 and VCC IC pin 15-LD between cathodes I know that I put a resistance for impedance matching directly into the Does pattern wiring need to take characteristic impedance into account?
Or, because it is wired at a short distance, it is not important to consider the pattern width, etc. Should I adjust it with resistance?
