Temperature-Dependent Study on L-Band EDFA Characteristics Pumped at 980 nm and 1480 nm in Phosphorus and Aluminum-Rich Erbium-Doped Silica Fibers

In this paper, wepresent a comparative study on temperature-dependent spectroscopic characteristics and L-band amplifier performance for aluminum-rich erbium-doped fiber (EDF) in-house fabricated phosphorus co-doped EDF. Different pumping configurations were studied to conclude that the pump wavelength of 980 nm with unequal forward/backward powers exhibited better temperature stability. Phosphorus EDF provided 19.4±1.4 dB gain 4.6±0.2 noise figure (NF) from 1575–1615 at room (RT), multi-channel input signal −25 dBm in each channel, whereas 20.3±5.1 5.3±0.8 NF. Using single-channel 1625 nm, maintained >10 9.6 12 increment than RT −60 °C, respectively. The (TDG) coefficient was range −0.006 −0.044 dB/°C 0.011 −0.023 EDF, over +80 °C. We propose hybrid concatenating suppress dependence improve bandwidth restriction 20.9±3.9 3.7±0.6 NF RT. TDG remained almost constant 1585–1615 contributing temperature-insensitive flatness.