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Our experiment is to use a quarter wave plate that rotates the
polarization direction of the incident semiconductor laser
light by 90 degree. The resultant output is fedback to the LD
to achieve the goal of feedback of orthogonal polarization
laser light. From the distance of 15 cm where the reflector is
set, using the feedback of orthogonal polarization laser light,
we can make the semiconductor laser produce the high speed
oscillation about 1GHz. However, with the change of laser
output power, and the shift of the frequency of high speed
oscillation, and the influence of how much the feedback is, we
can discuss the existing evidence such as to support the theory
of Otsuka & Chern . Moreover, during the process of experiment,
we observe some spectrums of those phenomenon which are
analogous to period-2, and period-3 and a quasi-chaotic state
discussed in nonliear dynamics.
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