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Ga/sub x/In/sub 1-x/As/sub y/P/sub 1-y/-InP tensile-strained multiple quantum wells (MQWs) grown by low pressure metalorganic chemical vapor deposition (LP-MOCVD) are studied for the application to 1.3-μm lasers. High-resolution X-ray diffraction curves show good agreement with theoretical simulation. Clear energy separation of light hole and heavy hole bands is observed in the room temperature photoluminescence measurement. Threshold characteristics of -1.15% tensile-strained MQW lasers with graded index separate confinement heterostructure (GRINSCH) are investigated. The minimum threshold current density per well (J/sub th//N/sub w/) for infinite cavity length obtained is 100 A/cm2 for the device with a well number of 3. Tensile strain dependence of J/sub th//N/sub w/ for an infinite cavity is also clarified.