Fabrication and emission properties of Er 3+/Yb 3+ codoped tellurite glass fiber for broadband optical amplification

Abstract

Tellurite glass is proposed as a host for broadband erbium-doped fiber amplifiers because of their excellent optical and chemical properties. A new single mode Er 3+/Yb 3+ codoped tellurite fiber with D-shape cladding geometry is fabricated in this work. When pumped at 980 nm, a broad erbium amplified spontaneous emission (ASE) nearly 100 nm in the wavelength range of 1450–1650 nm around 1.53 μm is observed. It was found that the emission spectrum from erbium in tellurite glass fibers is almost twice as broad as the corresponding spectrum in tellurite bulk glass. The changes in ASE with regard to fiber lengths and pumping power were measured and discussed. The output of about 2.3 mW from Er 3+/Yb 3+ codoped tellurite fiber ASE source is obtained under the pump power of 700 mW. The broad 1.53 μm emission of Er 3+ in Er 3+ /Yb 3+ codoped tellurite glass fiber can be used as host material for potential broadband optical amplifier and tunable fiber lasers.