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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