Could you please describe your application: jS.g]k
1, is the emitting source single mode or multimode? what are the parameters i.e. divergence, waist, ... F {+`uG
2, is the fiber single mode or multimode? what is the NA, core dia,... T ?Fcohz(
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Generally, fiber coupling efficiency of 40%~90% is reasonable. Wg`AZ=t
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Again let us know your specific bug. Y&HK