Abstract
We have investigated transmission-type wavelength filtering operation in semiconductor distributed feedback (DFB) lasers incorporating gain coupling (GC). This GC DFB laser filter has an inherent single pass band which is not much affected by the facet reflection or phases. Our analysis has predicted larger parasitic-band suppression and narrower pass bandwidth than conventional DFB laser filters. Next, we have demonstrated optical wavelength filtering operation in an actual GC DFB multiple quantum well (MQW) laser for the first time. We have confirmed the single transmission pass band in this type of DFB laser filter, and obtained useful characteristics such as 0.02 nm transmission bandwidth, 14 dB discrimination, zero insertion loss, and -12 dBm saturation power.
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