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Experimental layout: SF tunable seed laser, output (1); -band EDFA (2); OFR optical isolator (3); SIFAM pump combiner (4); fiber-coupled InP diode lasers (5); Liekki Er60-20/125DC fiber (6).
Combined spectrum of the six fiber-coupled laser diode modules at of output power (curve 2) overlaid with the Er60-20/125DC fiber absorption (curve 1).
Er60-20/125DC fiber absorption vs pump power in the presence of of seed radiation.
Single-frequency/single-mode output power of the Yb-free COTS Er60-20/125 cladding-pumped (at ) EDFA booster vs absorbed pump power with the fixed preamplifier output of at three different seeder wavelength (indicated on the inset).
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