Could you please describe your application: Jq$6$A,f 1, is the emitting source single mode or multimode? what are the parameters i.e. divergence, waist, ... Kq@m?h 2, is the fiber single mode or multimode? what is the NA, core dia,... !h`cXY~w eNlF2M Generally, fiber coupling efficiency of 40%~90% is reasonable. iuH8g HNkZ1+P { Again let us know your specific bug. '<{oYXZW3 >%jEo'0;_ MANG2004 >M8^Jgh