We experimentally investigated the wavelength matching between the probe light and injection-locked modes of FP-LD
(Fabry-Perot laser diode) for wavelength conversion configuration. Wavelength conversion from 1552.9nm to 1548.5nm
was obtained experimentally based on cross-gain modulation with the 10GHz repetition rate optical pulse train in a
FP-LD. Our results indicate that there always exists a selected longitudinal mode of the probe light in the FP-LD to
maximize the extinction ratio of the conversion signal. Moreover, there also exists an optimum injection signal pulse
power to improve the conversion signal further under the same matching mode of probe light wavelength with the
constant input power, and the constant detuning between the probe light and signal pulse wavelengths and the locked
modes of FP-LD with a certain bias current range.
We propose and experimentally demonstrate a novel technique that uses a single Fabry-Perot laser diode (FP-LD) to
perform simultaneous all-optical clock division and wavelength conversion. Utilizing the period-two oscillations
characteristics in an optically injected semiconductor laser and the cross-gain modulation effect of the injection locked
semiconductor laser, we achieve the simultaneous all optical clock division and wavelength conversion in a single FP-LD.
Clock frequency division of 12.8 GHz to 6.4 GHz with simultaneous wavelength conversion from 1550.24 nm to
1545.91 nm is obtained. The experimental results indicate there is a certain injection signal power to obtain stable clock
frequency division in an optimum wavelength detuning. It was empirically found that the best clock division and
wavelength conversion occurred when the injected signal power was approximately 2~2.5 times as the injected probe
light power, and the range of optimum wavelength detuning was about from -0.01 nm to 0.06 nm. Moreover, the FP-LD's
bias current also influence the clock frequency divisions, we demonstrate that the most effective conversion can be
obtain when bias current is located in the range of 1.6Ith~2.3Ith. The experimental investigations further show that there
is an optimum matching mode between the FP-LD and the probe light for obtaining the largest extinction ratio in
wavelength conversion.
We experimentally study the period doubling phenomenon of gain-switched multiple quantum well Fabry-Perot laser
diodes with/without external optical injection. The relations between resonance frequency and modulation frequency are
analyzed detailedly when period doubling occurs. The obtained research results indicate that external optical injection
may be an effective technique to suppress or enhance period doubling of a gain switched laser diode with injection
optical power. Experiments show that the period doubling would appear in a broader frequency range with external
optical injection, and indicate that period doubling occurs over a wide range of modulation frequency in laser diode as
the injection power increases. Moreover, we have studied in detail that period doubling easily occurs when bias current is
located between 1.1Ith and 1.3Ith, and modulation current is set between 0.5Idc and 2.5Idc.
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