1.3 μm InGaAsP buried crescent lasers with cobalt-doped semi-insulating current blocking layers grown by metalorganic chemical vapor deposition

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Abstract
Cobalt-doped semi-insulating InP layers grown by low-pressure metalorganic chemical vapor deposition (LPMOCVD) have been used for the first time as a current blocking layer for 1.3 μm InGaAsP buried crescent lasers. Lasers with this cobalt-doped InP blocking layer have cw threshold currents as low as 8 mA at room temperature. This is the lowest cw threshold current yet reported for an InGaAsP laser with a semi-insulating current blocking layer. In addition, the lasers exhibit total differential quantum efficiency of 60%, high-temperature operation up to 100 °C, high output power of 30 mW/facet, and a 3-dB modulation bandwidth of 11.6 GHz. These results indicate that the cobalt-doped semi-insulating InP layer grown by LPMOCVD provides effective current blocking for high-performance lasers.