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Quantum Electronics and Laser Science Conference

A scheme to realize class B slow light buffer in semiconductor optical amplifiers

Ming Xin, Minghua Chen, Hongwei Chen, Shizhong Xie

Published May 1, 2007• 0 citations
Publisher

Abstract

We proposed a scheme to realize Class B slow-light buffer in semiconductor optical amplifiers. With three electrical control signals, good characteristics of Class B buffer can be approached in SOA.
DOI
10.1109/qels.2007.4431434

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In contrast to absorbers, where the delay time via wave mixing saturates to its maximum with increasing device length due to decay of pump power along the device, in semiconductor optical amplifiers (SOAs) the delay time increases with the device length and is limited by the corresponding growth of the SOA gain, which can lead to unacceptable amplified stimulated emission in the SOA. The number of pulses which can be stored in an SOA, defined by the gain and group velocity dispersion, also is given ultimately by this SOA gain limitation, and is estimated between one and two.
Optical buffer is a key component in all-optical information processing systems. Slow light at room temperature via four-wave mixing in semiconductor an optical amplifier (SOA) is experimentally investigated. Time delay of 0.4 ns is achieved for a sinusoidal modulation signal at 0.1GHz, corresponding to a delay-bandwidth product (DBP) of 0.04. Factors that affect the experimental results are discussed. It is found out that the variable optical delay via four-wave mixing in SOA can be controlled either electrically by changing the SOA bias, or optically by varying the pump power or pump-probe detuning.