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Laser microwelding for fiber-chip coupling modules with tapered standard monomode fiber ends for optical communication systems

: Fischer, U.H.P.; Krips, O.; Müller, E.; Jacob, A.


Optical engineering 41 (2002), No.12, pp.3221-3229
ISSN: 0091-3286
ISSN: 0036-1860
ISSN: 1560-2303
Journal Article
Fraunhofer HHI ()

We design a laser welding machine for fabricating butterfly (BFY) modules with an optical coupling setup that is well suited for rapid prototyping and small-scale production of InP and GaAs-based waveguide-fed photonic components such as diode lasers, semiconductor amplifiers, optical modulators, and optoelectrical ICs (OEICs). The light of these devices is transferred very efficiently into single-mode fibers using integrated tapered lensed ends. In our setup the mechanical adjustment of the fiber-chip coupling is done semiautomatically by a newly designed coupling machine while laser welding performs the fixing of the fiber-chip connection. We found a yield of 47% within a shift of 1.0 µm at the initial welding spot. With additional weld adjustment, it was possible to extend the yield of 67%. We introduce, to our knowledge for the first time, an adjustable welding technique, which we call "strain-reducing" welding, which has several benefits in comparison to the well-known "laser hammering" technique.