The hardware of the ToF sensor can be divided into a transmitting end and a receiving end. The transmitting end is composed of a VCSEL laser source, a collimating lens and a DOE diffuser, and the receiving end is composed of a narrowband filter, an optical lens and an infrared CIS.
1. VCSEL is more suitable for 3D Sensing
There are two types of emission sources, one is edge-emitting (such as LD) and the other is vertical (such as VCSEL). The former generally has a longer wavelength and is used for information transmission; the latter can be used for compressing the volume of the vertical cavity. In smaller applications, it is more suitable as the light source of the tof sensor.
CSEL has excellent characteristics such as high efficiency, low power consumption, fast transmission rate, and low manufacturing cost. It has gradually replaced LED as the mainstream choice in 3D Sensing.
