An InGaAs/GaAs SQW laser integrated with a surface-emitting harmonic generator for DWDM applications

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Abstract
An In/sub 0.22/Ga/sub 0.78/As/GaAs single quantum-well (SQW) laser integrated monolithically with a surface-emitting harmonic generator (SEHG) segment was fabricated and tested. By coupling a 1.06- mu m Nd:YAG laser output into the active device, the green surface-emitting light at 0.51 mu m was observed as the result of nonlinear interactions within the SEHG segment. The nonlinear interaction cross section A/sup nl/ of the device was found to be 2.3*10/sup -7/ W/sup -1/, which agrees well with theory. The application of the active devices as a dense wavelength-division-multiplexing (DWDM) demultiplexer was demonstrated with a tunable Ti:sapphire laser to simulate the multiwavelength signal source and a CCD detector array to record the spatially separated signals of different wavelength. System resolution better than 2 nm was obtained for the device, which was limited by the short length of the SEHG segment. Potential for a DWDM channel spacing of 10 GHz is discussed.<>