Chaotic synchronization characteristics of the vertical-cavity surface-emitting lasers subjected by
anisotropic optical injection are numerically investigated. First of all, the synchronization quality of the
x-linear polarization (LP) mode and the y-LP mode are both periodically changed with the angle θ
between the polarizer and the light axes. Second, in a enough large scale region of the feedback
coefficient and the injection current, each LP mode can be obtained good synchronization quality when
the angle θ exists in the former half periods region., in the case that their synchronization quality are
independent of the polarization states of the lasers output. However, each LP mode can be achieved very instable and inferior synchronized quality, which is caused by the angle θ in latter half periods range.
The dynamic single-mode and modulation performance of λ/4 phase-shifted distributed feedback laser
diode with chirped grating (QWS-CG-DFB) are analyzed theoretically. The numerical simulation
shows that, In contrast to purely QWS-DFB laser, the enhanced dynamic single-mode suppression ratio
(SMSR) can be reached by QWS-CG-DFB laser; Under the smaller biasing current, the modulation
band-width in presence of chirped grating is narrower, this difference shrinks for larger biasing current;
For large signal modulation, the chirped grating is helpful to increase the output extinction ratio, but
worsens the frequency chirping.
The carrier lifetime is usually treated as a constant (called as the constant carrier lifetime assumption (CCLA)) during modeling theoretically the chaotic behaviors of semiconductor lasers. In this paper, after considering the actually recombination mechanism of the carriers in the semiconductor and the variation of the carrier lifetime with the time, the chaotic characteristics of semiconductor laser with optical feedback have been investigated numerically, and the obvious differences can be observed compared with those obtained with the CCLA.
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