Pump-efficient flattop O+E-bands bismuth-doped fiber amplifier with 116 nm –3 dB gain bandwidth

Abstract

We report on a new record in the field of broadband BDFA in the O+E spectral range. Using only 250 mW single wavelength pump at 1256 nm and a low-OH bismuth-doped fiber containing two types of bismuth active centers, we achieved >23 dB gain from 1325 nm to 1441 nm with flatness <3 dB and a NF of <6.8 dB. Three different pump wavelengths were considered: 1230, 1256, 1270 nm. Pumping at the shortest wavelength enabled wider gain bandwidth – 125 nm but required pump power up to ∼620 mW, whereas the longest one provided higher pump efficiency but narrower gain bandwidth. We also studied multiple wavelength amplification effects in the BDFA to reveal potential problems with simultaneous broadband signal amplification in such amplifiers.

(INVITED) Bi-doped optical fibers and fiber amplifiers

“…Being spectrally adjacent to the EDFA also makes it advantageous to develop efficient BDFAs due to the convenience of available components in the market. Moreover, it is not beneficial either economically or technically to use a number of separate [54,55,[80][81][82][83][84][85][86] amplifiers in optical communications. Therefore, a single fiber amplifier with a broad gain bandwidth is preferred.…”

High gain E-band amplification based on the low loss Bi/P co-doped silica fiber

“…Studies have shown that luminescence properties of Bi-doped silica fibers are closely related to the core composition and the valence state of Bi ions [6] . Over the past few decades, lasing and optical amplification between 1100-1800 nm have been reported using the Bi-doped fibers based on different glass hosts (i.e., aluminosilicate, phosphorsilicate, and germanesilicate) [7][8][9][10][11] . Bi-doped fiber amplifiers (BDFAs) operating over the extended transmission bands have been achieved abroad with the gain of 11.5 dB at 1180 nm, 40 dB at 1350 nm, 27.9 dB at 1445 nm, and 25 dB at 1725 nm using Bi-doped aluminosilicate fibers, Bi-doped phosphosilicate fibers, and Bi-doped high germania silica fibers, respectively [12][13][14][15] .…”

Neural network modeling of bismuth-doped fiber amplifier

“…This unique feature of Bi-doped fibers makes them one of the most promising amplification tools for the MBT. The bismuth-doped fiber systems showed a great potential for telecommunications after successful information transmissions in O- [10] and E-bands [11,12,13], and the simultaneous signal amplification in different amplification bands [8,14].…”