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Broad wavelength tuning under single-mode oscillation is achieved for a 1.5 ?m range multi-electrode distributed feedback laser. The lasing wavelength can be tuned electrically, maintaining a stable single-mode oscillation without mode jumping. The tuning has reached over 20 ? under a noticeable condition of constant power (5mW), with a sufficient side-mode suppression ratio over 30 dB.
The probability of single-longitudinal-mode (SLM) operation is calculated for three kinds of DFB facet structures. To obtain high SLM probability, a DFB laser with cleaved facets requires relatively large kL, but the introduction of asymmetry to facet reflectivity greatly relaxes the kL requirements.
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