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Detuning characteristics and conversion efficiency of nearly degenerate four-wave mixing in a 1.5-μm traveling-wave semiconductor laser amplifier

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2 Author(s)
Mukai, Takaaki ; NTT Basic Res. Labs., Tokyo, Japan ; Saitoh, Tadashi

The optical nonlinearity in a semiconductor laser gain medium is investigated through copropagating nearly degenerate four-wave mixing (NDFWM) in a 1.5-μm InGaAsP traveling-wave laser amplifier (TWA). The FWM signal output powers vary symmetrically with the sign of probe detuning with respect to the pump frequency, while the pump and probe output powers vary asymmetrically. The NDFWM conversion efficiency from the probe input to the FWM signal output is a maximum of 8.3 dB around zero detuning and has positive gain in the range of ±6 GHz. This demonstrates highly efficient nonlinear interaction due to both large optical gain and large third-order susceptibility. The NDFWM efficiency is also investigated in connection with the TWA gain saturation characteristics and is found to be a maximum for operation around the saturation intensity of the TWA

Published in:

Quantum Electronics, IEEE Journal of  (Volume:26 ,  Issue: 5 )