Abstract
The static and dynamic characteristics of digital wavelength switching in
a novel V-coupled-cavity semiconductor laser is investigated. In contrast to
previously investigated Y-laser, the V-shaped coupler can realize not only
an optimum coupling coefficient but also a $\pi$-phase difference between the cross-coupling and self-coupling
coefficients, which results in a high single-mode selectivity. It is shown
that while switching to an optimal current value results in the maximal
output power and maximal side-mode suppression ratio (SMSR), the digitally
wavelength switchable laser has a good tolerance on the accuracy of the
switching current. For a current deviation corresponding to ${\pm}25\hbox{\%}$ of the channel spacing, the SMSR only degrades by about 5.2 dB,
while the wavelength varies by only ${\pm}0.01$ nm from the set value for the case of 0.8 nm channel spacing. The
dynamic properties including the switching transients and switching delay
are also investigated and discussed.
© 2010 IEEE
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