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A 1.5 ?m InGaAsP buried-heterostructure laser amplifier having small optical-mode confinement was fabricated with a Fabry-Perot cavity configuration. Its signal gain, saturation output power and noise characteristics were studied and found to be superior to those for AlGaAs amplifiers, as a result of small optical-mode confinement.
Room-temperature operation of distributed Bragg reflector (DBR) lasers emitting at 1.5 ?m is reported. The diode was fabricated by conventional techniques and has a simple configuration with a built-in waveguide grown by single-step liquid-phase epitaxy. Single-longitudinal-mode oscillation at 1.504?1.505 ?m was obtained at temperatures between ?10?C and 5?C with 310?360 mA threshold current.
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