Self driving cars are expected to drive safely under all weather conditions and traffic scenarios. Significant progress has been made so far, but further advancements in hardware and software are required to achieve this goal. This talk will discuss how lidar performance impacts autonomous driving; and how multiple sensing modalities combined with perception software are resolving edge cases experienced on the road.
The generation of optical pulses with parabolic time intensity profiles is experimentally demonstrated. A Mode Locked Laser
(MLL) that generates near transform limited pulses with a gaussian optical spectrum are temporally stretched using a linearly
chirped fiber Bragg grating. The temporal intensity profile of the stretched pulses matches the optical spectrum of the laser
due to frequency-to-time mapping. An amplitude modulator is driven by a carefully designed voltage signal to result in
parabolic pulses. Experimental results of pulse shaping with a MLL input source are presented, and show good agreement
with modeling results. Parabolic pulse generation using a CW laser source is also demonstrated and a deviation of less than
3% from an ideal parabola is observed.
A chirped fiber Bragg grating with a dispersion of 1651ps/nm is used to generate temporally stretched,
frequency chirped pulses from a passively mode locked fiber laser that generates pulses of ~1ps (FWHM)
duration at a repetition rate of 20MHz with 3.5mW average power (peak power of 175W). The use of a
chirped fiber Bragg grating enables the generation of temporally stretched pulses with low peak power so
that non-linear effects in the fiber can be avoided. A fiber based interferometeric arrangement is used for
interfering a reference signal with the reflected signal from the target to realize a coherent heterodyne
detection scheme. In the RF domain, the detected heterodyne beat frequency shifts as the target distance is
changed. A round trip target distance of 14km in air is simulated using 9.3km of optical fiber and a
resolution of less than a millimeter is observed.
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