We report side-wall sampled grating and quantum well intermixing techniques to fabricate a full function 4-channel DWDM source with excellent wavelength precision (residuals <0.13 nm) and high yield. Output power was >10 mW.
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monolithic side-wall sample grating,DFB laser array,quantum well intermixing,full function 4-channel DWDM source,wavelength precision,high yield,output power