The importance of lower cost while maintaining high performance of erbium-doped fiber amplifiers (EDFAs) is growing with increased bandwidth demand. The uncooled 980-nm miniature dual-inline (Mini-DIL) pump laser is attractive for compact EDFA designs because it offers the advantages of lower cost, smaller footprint, minimal heat generation, and reduced electrical power consumption. In this paper, we report a low-cost uncooled Mini-DIL module designed for 980-nm pump lasers. A three-dimensional finite element analysis model effectively predicts module thermal and stress performance. Experimental results of module power and coupling efficiency stability over assembly processes are presented. A minimum optical output power of 150 mW is achieved in a group of 10 devices across a temperature range of 0 C to 70 C at a drive current of 350 mA with a 1.5-mm raised ridge InGaAs/AlGaAs single quantum well laser chip.Index Terms-Finite-element method, miniature dual-inline (Mini-DIL), semiconductor laser, uncooled laser.

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This paper reviews recent progress of high-power 14xx-nm pump lasers using AlGaInAs/InP material. This material has superior temperature characteristics to conventional InGaAsP/InP. As a result, it is more suitable for high current and high efficiency operations as well as uncooled applications for the high power 14xx-nm lasers, which are required for advanced optical amplifications. The laser module consists of a laser chip coupled to a fiber lens and mounted on a thermoelectric cooler in a standard butterfly package. The wavelength of the laser can be stabilized with an external fiber Bragg grating (FBG). We have demonstrated a maximum module fiber output power of 550mW at 1.75A and characteristic temperatures of T 0 = 99K and T 1 = 348K over a range of chip heat-sink temperatures from 15 0 C to 50 0 C. To the best of our knowledge, these are the highest efficiency and temperature characteristics from a single-mode 14xx-nm semiconductor laser module capable of over 0.5W fiber output power. At a chip heat-sink temperature of 70°C, a power of 360mW was obtained for a laser module with FBG, which is the highest reported to date for any wavelengths from 1300nm to 1600nm and would enable uncooled applications of the 14xx-nm lasers in the future.

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