OPT3101EVM: OPT3101 EVM Emitter modulation

Part Number: OPT3101EVM Hello Support, I am using an OPT3101 EVM module and want to know if the emitted light signal can in any way be modulated from my side. Is it possible to emit sinusoidally modulated light signal from the emitter? Even with external modulation? Thanks in advance. best regards, Ayushya

Hi, What is the reason for doing this? OPT3101 already modulates the emitter with a 10MHz square wave. Are you trying to add a lower frequency component on top of this? Can you also give some background on your application and use-case here for me to better understand? Best, Alex

Hello Alex, Thanks for your reply. I want to modulate the emitter with a sinusoidal wave, although with the same amplitude and frequency. Best, Ayushya

Hi, You cannot change the 10MHz modulation to a sine wave. Best, Alex

Hello Alex, Thanks for your reply. So, is there any way that I can attempt to emit a sinusoidally modulated light signal from the LED and then receive the reflected light (which will also be sine) by the Photodiode? Any assistence is hugely appreciated. Best regards Ayushya

Hi Ayushya, Is this question different from what I answered above? If so I will need more details of what you are trying to do. Best, Alex

Hi Alex, thanks again. My project is based on distance measurement using time of flight. In this, an emitter transmits a sinusoidally modulated light signal in NIR range, and based on the phase shift of the reflected sinusoidal light signal, the distance is measured. There is an algorithm to be developed which will remove the Multipath Interference from the received light signal. See image : I was initially hoping that the OPT3101EVM might be useful in collecting the received signal from the sensor and also that the LED can be supplied with a sinusoidal signal. Please let me know if there is more information I can provide on this. Thanks and regards Ayushya