3.5 W Broadband PM Hybrid Amplifier at 2051 nm With Holmium- and Thulium-Doped Single-Clad Fibers

Novel Highly Efficient In-Band Pump Wavelengths for Medium Slope Efficiency Holmium-Doped Fiber Amplifiers

“…To our knowledge, our presentation of 1860 nm in-band pumping for a Ho-doped fiber amplifier is the first discussion of a noteworthy in-band alternative pump wavelength for this amplifier system. Previous published work has used pump wavelengths almost exclusively at or near 1940 nm [8]- [20], [29]. A high wavelength pump near 2000 nm was investigated in [15], [19] and found to yield suboptimum results.…”

“…We start our analysis by noting that in our research on HDFAs to date, we have chosen an in-band pump wavelength of 1940 nm based on a survey of the previous literature [14]- [20], [29] and also on consideration of the gain and absorption curves for the iXblue single clad Ho-doped fiber IXF-HDF-PM-8-125 [8], [14]. Figure 1 is a plot of these gain and absorption curves, where we see that the maximum absorption is 57 dB/m at 1945 nm.…”

“…We have previously shown that hybrid polarization maintaining (PM) Holmium-doped fiber amplifier (HDFA) architectures exhibit low noise figure (NF), high output powers, and a large operating spectral bandwidth [8]- [13]. In all these amplifiers, the HDFA is pumped at an in-band wavelength of 1940 nm which is based on a survey of the previous literature [14]- [20], [29] and also on previous technical results.…”

Performance Optimization of Holmium Doped Fiber Amplifiers for Optical Communication Applications in 2–2.15 μm Wavelength Range

“…DFAs have researched widely since past few decades but as such HDFAs are concerned, we find handful contributions such as [5,[12][13][14][15][16][17] because this dopant is being recently considered for applications in 2-2.15 µm wavelength range. R. E. Tench et al proposed a medium efficiency HDFA design employing an alternate pump wavelength of 1.84 µm instead of conventional in-band pump wavelength of 1.940 µm.…”

“…Zhluktova et al proposed a HDFA which produce a gain of 34.5 dB and output power of 0.798 W for signal having wavelength of 2.016 µm [16]. A broadband Thulium and Holmium dopants based hybrid amplifier was proposed where peak gain of 49.1 dB and output power of 3.54 W at 2.051 µm was demonstrated [17].…”