We demonstrate an all-fiber multi-mode, multi-core photonic lantern mode multiplexer for SDM applications. Selective excitation of 21 spatial channels, LP01 and LP11a,b modes in 7 cores, with insertion losses below 0.4dB is obtained.
We demonstrate selective spatial mode amplification in a few mode, double-clad Yb-doped large mode area (LMA) fiber, utilizing an all-fiber photonic lantern. Amplification to multi-watt output power is achieved while preserving high spatial mode selectivity. We observe gain values of over 12 dB for all modes: LP<sub>01</sub>, LP<sub>11a</sub>, and… (More)