Multimode fiber coupled laser diodes are based on broad area side emitting laser diode chips initially designed and made from a semiconductor wafer.
There are 4 types of Multimode fiber coupled laser diodes
Single emitters: when a laser diode chip is isolated, assembled on a sub-mount and packaged alone in a laser diode module. We talk here typically about 15W of power coupled into a 105 (core)/125µm(clad) laser diode
Multi emitters: when several emitters are separated and optically coupled together with other isolated emitters in a multimode fiber. The level of output power is thus scalable up to several hundred watts and the size of the fiber can be kept small like 100 or 200 µm core.
Single bars: when several emitters are kept together as a single bar and assembled in a laser diode module. We talk here typically about 50 W of power coupled into typically a 200 µm(core)/240 µm(clad) laser diode
Multiple bars: When several bars are assembled in a large water-cooled package and coupled in a large diameter multimode fiber. We talk here about 100’s of W of even KW coupled into, for example, 600 or 800 µm core multimode fibers.
It is interesting to notice how the typical voltage and current levels change when considering the various families:
A typical unitary emitter has a typical voltage level of ~1.5 V and a current of ~15 A.
For a multi-emitter laser diode, the emitters are assembled in series. It means that the level of current does not change (typically 15 A max), but it is the voltage which increases when considering more and more emitters. (for example, 4.5V/15A for a 60 W laser diode)
A laser diode bar assembles all the emitters in parallel. So, the level of voltage does not change, but the level of current can easily reach 45 or 50 A.
Again, when assembling several bars together, these are assembled in series, so the level of current (for example 45 A) does not change, but the voltage increases regularly with the number of bars.
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