Low threshold Er(x)Yb(Y)(2-x)SiO(5) nanowire waveguide amplifier.

Area of Science:

• Materials Science
• Optoelectronics
• Nanotechnology

Background:

• Waveguide amplifiers are crucial for optical communication.
• Erbium-doped materials are widely used for 1.53 μm amplification.
• Upconversion effects can limit amplifier performance.

Purpose of the Study:

• Investigate the 1.53 μm gain characteristics of Er$_{x}$Yb(Y)$_{2-x}$SiO$_{5}$ nanowire and film waveguide amplifiers.
• Analyze the impact of cooperative upconversion (CUC) on amplifier performance.
• Determine the factors influencing gain and threshold in nanowire waveguides.

Main Methods:

• Solving rate equations and propagation equations to model amplifier behavior.
• Comparing gain characteristics of nanowire and film waveguides.
• Analyzing the relationship between optical gain, material composition, waveguide dimensions, and pumping power.

Main Results:

• Er$_{x}$Yb(Y)$_{2-x}$SiO$_{5}$ nanowire waveguides exhibit significantly enhanced gain compared to film waveguides due to lower propagation loss and longer photoluminescence lifetime.
• Cooperative upconversion (CUC) significantly reduces gain (from 27 dB/mm to 2 dB/mm).
• Nanowire amplifiers demonstrate very low thresholds (0.7-10.7 mW) with CUC, orders of magnitude lower than thin-film devices.

Conclusions:

• Nanowire waveguides offer superior performance for 1.53 μm amplification compared to traditional film waveguides.
• While CUC reduces gain, it enables significantly lower threshold operation in nanowire amplifiers.
• These findings highlight the potential of Er$_{x}$Yb(Y)$_{2-x}$SiO$_{5}$ nanowires for advanced optical amplifier applications.