Timing of high speed optical transients

Integrated timing detectors for high-speed optical transients in the region of 100ps to a few nanoseconds (FWHM) are being developed. Typically the “detector” consists of a sensitive amplifier chain (low noise) to convert the low current signal from the avalanche photo diode (APD) to a voltage-type signal, and the timing circuitry. The main aim is to minimize the timing error (timing walk) which is being produced due to the varying amplitude of the received optical echo and electrical delay of the receiver. Especially, “time-domain” timing discrimination techniques are being developed.

A recently designed fully integrated laser radar receiver channel (0.35 μm SiGe BiCMOS) with a BW of 300MHz, eq. input noise less than 100nArms and eq. ZT ≈ 70kΩ.

Timing walk as a function of the peak current of the APD output pulse (3ns) after ”time – domain” walk error compensation.

Selected publications

S. Kurtti, J. Kostamovaara, “An Integrated Laser Radar Receiver Channel Utilizing a Time-Domain Walk Error Compensation Scheme”, IEEE Transcations on Instrumentation and Measurement, vol 60, Issue 1, 2011, pp. 146-157.

J. Nissinen, I. Nissinen, J. Kostamovaara, “Integrated Receiver Including Both Receiver Channel and TDC for a Pulsed Time-of-Flight Laser Rangefinder With cm-Level Accuracy”, IEEE Journal of Solid-State Circuits, Vol. 44, Issue no. 5, 2009, pp. 1486-1497.

S. Kurtti, J. Kostamovaara, “Laser Radar Receiver Channel With Timing Detector Based on Front End Unipolar-to-Bipolar Pulse Shaping”, IEEE Journal of Solid-State Circuits, Vol. 44, Issue no. 3, 2009, pp. 835-847.

J. Pehkonen, P. Palojärvi, J. Kostamovaara , “Receiver Channel with Resonance-Based Timing Detection for a Laser Range Finder”, IEEE Transactions on Circuits and Systems I, Volume 53, Issue 3, March 2006, pp. 569 - 577

 

Last updated: 11.1.2013