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We present a suite of silica-based thulium-doped fiber amplifiers (TDFAs) operating across the 1650–2050nm waveband. High gain and low NF are achieved by combining several TDFA designs optimized for short, central and long wavelength operation.
We demonstrate mode-multiplexed transmission over all-fiber optically amplified spans of 215 km and 179 km for 3 and 6 spatial modes, respectively. The spans were amplified using two cladding-pumped few-mode fiber amplifiers.
We report the first demonstration of in-band diode-pumped silica-based thulium-doped fiber amplifiers working in the 1.7–1.8 μm waveband. Compared to previously reported results, 90 nm gain extension has been achieved by exploiting novel amplifier designs.
We present a 3-moded cladding-pumped multi-element fiber amplifier comprising 4 Er/Yb doped signal fibers and 1 multimode pump-delivery fiber with spatial multiplicity of 12. An average signal gain of 18dB and differential modal gain of 2–5dB are achieved.
We report a detailed study on the system performance of a two-mode group EDFA. In particular we quantify how the gain spectrum and BER performance are affected by input signal and pump power as required in the execution of our ongoing MDM transmission experiments.
We report the realization of a thulium doped fiber amplifier designed for optical communications providing high gain (>35dB) and low noise figure (<;6dB) over 1910nm-2020nm with a maximum saturated output power of more than 1W.
We report the first experimental realization of thulium doped fiber amplifier providing high gain (>40dB), noise figure as low as 5dB and over 100nm wide bandwidth around 2µm with maximum saturated output power of 400mW.
We present results on broadband gain equalisation in a MM-EDFA for SDM transmission obtained by optimization of the pump launch and careful tailoring of both the fiber refractive index profile and erbium ion distribution.
We demonstrate simultaneous modal gains of ∼20dB for different pair-wise combinations of spatial and polarization modes in a MM-EDFA. The differential modal gains are reduced by fiber design and control of the pump field distribution.
A circular-polarized array antenna having a novel feeding structure like a substrate integrated waveguide(SIW), SIW-based power divider, and sequentially rotated cavity-backed single element is proposed for satellite communication and enhancement of electrical performances in a double-layered fabrication. The bandwidth enhancements in terms of CP generation and broadband impedance matching characteristics...
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