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1 April 1999 High-brightness broad-area lasers with high reliability for Yb-Er-fiber pumping applications
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State-of-the-art pump lasers for fiber amplifiers in optical telecommunication systems can deliver up to 250 mW optical power in single mode emission. Power approaching 500 mW is seen as the upper limit for single mode lasers without sacrificing reliability. For yet higher power, broad area laser diodes coupled into the cladding of ytterbium-erbium doped fibers have a great potential to achieve more gain. Here, Diode lasers with a ridge width of 30 micrometer mounted junction-side-up using a hard-tin solder are presented as an alternative over EDFA pumping by single-mode lasers. Reliable broad area lasers are obtained by adopting standard narrow-stripe single-mode laser technology with proven 110 FIT at 150 mW and 25 degrees Celsius varying only the ridge width. Reliability and packaging problems commonly associated with p- side down mounting are avoided. Due to the high power conversion efficiency greater than 55% of the laser chip, a cw maximum output power as high as 1.1 W can be obtained. Submicron fiber alignment tolerances are no longer required, as compared to single mode lasers. Due to low heat dissipation these 30 micrometer stripe lasers can be operated in standard butterfly packages and high coupling efficiencies are achieved above 80% into standard 50 micrometer multimode fibers. YEDFA's with 23 dBm output power using these lasers have been demonstrated.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Stefan Mohrdiek, Luigi R. Brovelli, Manfred Burkard, Christoph S. Harder, Abram Jakubowicz, William Patrick, Erica J. Williams, and Albert Oosenbrug "High-brightness broad-area lasers with high reliability for Yb-Er-fiber pumping applications", Proc. SPIE 3628, In-Plane Semiconductor Lasers III, (1 April 1999);

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