Abstract
Optical feedback effects on the emission properties of 1.3 μm InGaAsP InP ridge waveguide lasers were studied experimentally for both dc pumping and current modulation. The laser diodes used in our experiments showed a current-induced transition from TM to TE polarization without external feedback. At external optical feedback, the current for the onset of TM/TE transition droped by 25 mA and multiple TM/TE switching was observed over a large current interval. The dynamic response of the external-cavity laser to current pulses of various width was found to depend sensitively on the fine tuning of the external cavity length, resulting in TM/TE oscillations of 2 or 10 GHz, respectively, in the case of 2 ns current pulses. The physical mechanism responsible for the observed behaviour is discussed.
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