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1, is the emitting source single mode or multimode? what are the parameters i.e. divergence, waist, ... %*&UJpbA
2, is the fiber single mode or multimode? what is the NA, core dia,... B<~ NS)w
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Generally, fiber coupling efficiency of 40%~90% is reasonable. J41G&$j(
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Again let us know your specific bug. "
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