A. Klehr et al., INFLUENCE OF EXTERNAL OPTICAL FEEDBACK ON POLARIZATION SWITCHING IN INGAASP INP LASERS/, Optics communications, 134(1-6), 1997, pp. 179-185
Optical feedback effects on the emission properties of 1.3 mu m InGaAs
P/InP ridge waveguide lasers were studied experimentally for both de p
umping and current modulation. The laser diodes used in our experiment
s showed a current-induced transition from TM to TE polarization witho
ut external feedback. At external optical feedback, the current for th
e onset of TM/TE transition droped by 25 mA and multiple TM/TE switchi
ng was observed over a large current interval. The dynamic response of
the external-cavity laser to current pulses of various width was foun
d to depend sensitively on the fine tuning of the external cavity leng
th, resulting in TM/TE oscillations of 2 or 10 GHz, respectively, in t
he case of 2 ns current pulses. The physical mechanism responsible for
the observed behaviour is discussed.