Nonlinear MSM Photodetector Model for High Resolution Laser Impulse Radar Imaging

摘要

Based on the recently developed modulation scheme of highly dynamic and strong carrier injection into the active zone of a single-heterostructure (SH) laserdiode, laser pulses of some hundreds of watts and pulse widths (FWHM) of about 30 ps are available. Such optical pulses are useful for high precision near-field ranging. Until now suitable optical receivers are not available. This paper concerns a broadband optical receiver using a very fast large area MSM photodiode. We present nonlinear CAD Models for photodiode derived from measurement which can be to analyze the nonlinear transfer function versus the optical large signal stimulus. Accurate models correction of the distorted signals can be performed to making time interval measurement more accurate. Measurement uncertainties in the micrometer range could be attained by data range error correction using a nonlinear equivalent network for the device. The results are demonstrated on the basis of 2D and 3D mapped objects.