Advanced high-performance light sources for LiDAR sensors
EXALOS is the leading supplier of wide-bandwidth and high-power SLEDs in the near infrared range (NIR) with wavelengths ranging from 750 to 1700 nm. The EXALOS portfolio includes light sources with different output powers and bandwidths.
There are two key approaches to LiDAR sensing:
direct detection and coherent detection.
Direct detection measures the time it takes for individual emitted light pulses (“Time of Flight” or ToF) to return to the photodetector, and the distance to the object can then be calculated from that measurement.
Coherent detection modulates a source signal onto an emitted coherent laser wave. The receiving sensors then detect the environment by comparing the phase and frequency of the received signal to the original.
LiDAR Sensors operate in the 900 ~ 1550 nm near-infrared spectrum.
However, LiDAR operating at 1550 nm enables spatial resolutions that are 2500 times finer than radar’s 4mm when operating at 77GHz. This means LiDAR is ideal for creating very accurate 3D depictions of a vehicle’s surroundings. Incoherent systems (typically Time of Flight or ToF) and coherent systems (typically frequency modulated continuous wave or FMCW) are the key LiDAR approaches for automotive, each with differing trade-offs. indie believes that coherent LiDAR systems offer significant advantages in range, velocity, and reflectivity measurement over incoherent systems, and are also more resilient to other interfering light sources.
The performance and quality of LiDAR sensors depends on their light sources.
Flip-chip bonding of chip to PIC
Thin layers on chip (metal and oxide) and etch depths are controlled with high accuracy and tailored to customer needs. This to ensure an efficient matching to alignment features present on the PIC.