[OPTICAL REVIEW Vol. 6, No. 2 (1999) 144-148]
Autocorrelation Method to Detect Frequency Shift of a Laser Diode by Short Pulse Irradiation
Sasono RAHARDJO, Seiichi KAKUMA and Ryoji OHBA
Division of Applied Physics, Graduate School of Engineering, Hokkaido University, Kita-13 Nishi-8, Kita-ku, Sapporo, 060-8628 Japan
(Received November 9, 1998; Accepted December 25, 1998)
A new method to investigate fast frequency modulation of a laser diode by applying optical pulse irradiation is presented. The self-delayed heterodyne technique and an autocorrelation method are used to detect beat in the heterodyne signal due to frequency shift by the irradiation. Autocorrelation of the beat signal is suggested to be calculated via its spectrum.
Key words : optical frequency modulation, optical pulse irradiation, autocorrelation function, self-delayed heterodyne technique, laser diode