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E-band Nd³⁺ amplifier based on wavelength selection in an all-solid micro-structured fiber.

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|April 7, 2017

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This study demonstrates a novel Neodymium (Nd³⁺) fiber amplifier operating in the E-band (1375-1466 nm). Optimized fiber designs promise future amplifiers with lower noise and higher gain for telecommunications.

Area of Science:

Optical Engineering
Materials Science
Telecommunications

Background:

The E-band (1375-1466 nm) offers significant bandwidth for optical communications but lacks efficient amplifiers.
Neodymium (Nd³⁺) doped fibers present a potential alternative to erbium-doped fibers for E-band amplification.

Purpose of the Study:

To demonstrate a functional Nd³⁺ fiber amplifier operating in the E-band.
To investigate the impact of excited-state absorption (ESA) on Nd³⁺ gain characteristics.
To identify key fiber parameters for optimizing future E-band amplifier performance.

Main Methods:

Fabrication and characterization of a Nd³⁺ fiber amplifier.
Utilized a wavelength-selective waveguide to suppress amplified spontaneous emission (ASE).

Related Experiment Videos

Measured small-signal gain, noise figure, and emission/absorption cross-sections.

Main Results:

Achieved a gain bandwidth from 1376 nm to 1466 nm with a peak gain of 13.3 dB at 1402 nm.
Observed a noise figure of 7.6 dB.
Identified that ESA limits gain below 1375 nm but diminishes beyond this, enabling efficient amplification around 1400 nm.

Conclusions:

Nd³⁺ fiber amplifiers are feasible for E-band telecommunications.
Optimizing fiber mode field diameter and reducing background loss can significantly enhance amplifier performance (noise figure < 5 dB, gain > 20 dB).
This technology offers a pathway to extend optical communication capacity using existing amplifier architectures.