Abstract
Near infrared broadband emission characteristics of bismuth-doped aluminophosphate glass have been investigated. Broad infrared emissions peaking at 1210nm, 1173nm and 1300nm were observed when the glass was pumped by 405nm laser diode (LD), 514nm Ar+ laser and 808nm LD, respectively. The full widths at half maximum (FWHMs) are 235nm, 207nm and 300nm for the emissions at 1210nm, 1173nm and 1300nm, respectively. Based on the energy matching conditions, it is suggested that the infrared emission may be ascribed to 3P1? 3P0 transition of Bi+. The broadband infrared luminescent characteristics of the glasses indicate that they are promising for broadband optical fiber amplifiers and tunable lasers.
Highlights
In the process of realizing super-high speed and super-large transmission capacity of optical communication, wavelength division multiplexing (WDM) technique is playing a key role because it can transmit multiple signals into a single optical fiber simultaneously
Novel optical fiber amplifiers with more broad band than existed EDFA, PDFA and TDFA amplifiers are indispensable for WDM systems to obtain much more transmission channels
The luminescent spectra of PAB and glass with the composition of 96GeO2-3Al2O3-1Bi2O3 (GAB) glasses are shown in Fig. 3 when excited by 808nm laser diode (LD)
Summary
In the process of realizing super-high speed and super-large transmission capacity of optical communication, wavelength division multiplexing (WDM) technique is playing a key role because it can transmit multiple signals into a single optical fiber simultaneously. Erbiumdoped optical fiber amplifiers (EDFA) have been extensively utilized in WDM systems for the third telecommunication window (1.55μm) and ~80nm super-broad flat gain has been achieved [1]. To fully utilize the second window of the optical communication, two possible ways are under consideration: 1) to investigate most suitable hosts for praseodymium ion, which have high quantum efficiency of Pr3+ and should be connected to silica fiber. Fujimoto discovered a new infrared broadband emission from bismuth-doped silica glasses and realized 1.3μm optical amplification with 0.8μm excitation [3,4], which provided a promising candidate for 1.3μm broadband optical fiber amplifiers and tunable lasers. To the best of our knowledge, infrared emission of bismuth-doped aluminophosphate glasses hasn’t been investigated up to now. We synthesized bismuth-doped aluminophosphate glasses and observed infrared broadband emission centered at 1300nm with FWHM of 300nm under 808nm LD excitation. The lifetime is as long as 500μs, comparable to those of other transition metal ions (e.g. Ni2+, Cr4+) [6,7]
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