Abstract
A multi-wavelength pumped thulium doped fiber amplifier is investigated to extend the spectral gain coverage of the amplifier in the 1.7-1.9μm wavelength range. Through the use of a combination of 791 nm, 1240 nm, and 1560 nm laser diode pumping, the amplifier gain can be improved significantly and overall gain bandwidth enhancement of ~47% as compared to single-wavelength pumping achieved. A nominal gain of 15 dB is achieved over a bandwidth of more than 250 nm spanning from 1700 to 1950 nm with a maximum gain of 29 dB and a noise figure of less than 5 dB.
Highlights
The explosive increases in internet speed and usage are steadily pushing today’s telecom wavelength region has been proposed as an attractive new transmission window for optical communications, motivated mainly by the demonstrations of low-loss, low nonlinearity, and low latency hollow-core photonic band-gap fibers which are predicted to have a minimum loss around 2 μm [3,4,5,6]
It is to be appreciated that the wide spectral coverage of the Thulium doped silica fiber amplifiers (TDFAs) has only been realized by concatenating several different TDFA configurations as individual amplifiers can only deliver a limited fraction of the full amplification bandwidth
We have demonstrated a low-noise broadband silica based TDFA employing multi-wavelength pumping
Summary
The explosive increases in internet speed and usage are steadily pushing today’s telecom wavelength region has been proposed as an attractive new transmission window for optical communications, motivated mainly by the demonstrations of low-loss, low nonlinearity, and low latency hollow-core photonic band-gap fibers which are predicted to have a minimum loss around 2 μm [3,4,5,6]. J. Richardson, "Diode-pumped wideband thulium-doped fiber amplifiers for optical communications in the 1800 – 2050 nm window," Opt. Express 21, 26450-26455 (2013). J. Richardson, "90 nm gain extension towards 1.7 μm for diode-pumped silica-based thulium-doped fiber amplifiers," in The European Conference on Optical Communication, 2014, 1-3.
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