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We directly measure the spatially and spectrally resolved gain of erbium doped multicore and few mode fiber amplifiers using a coherent swept wavelength interferometer operated in the reflection mode. It greatly simplifies the characterization of multispatial mode amplifiers because it enables characterization of the mode-dependent gain with only a single mode-selective multiplexer at the input. The...
We directly measure the optimum length and the mode-dependent gain of multi-core and few-mode optical amplifiers using a swept wavelength interferometer operated in reflection mode. The technique requires only one space multiplexer and eliminates cut-backs.
We compare two 6-core annular cladding erbium-doped fibers achieving >19 dB gain and <6 dB noise figure across the C-band. The annular cladding improves the pump power utilization by 40% compared to uniform double-cladding.
Adiabatic pulse propagation in a dispersion-increasing fiber is used to generate dual spectrally compressed peaks with tunable amplitudes. Our experimental results are in excellent agreements as compared to numerical calculations.
We demonstrate experimentally that laser amplitude and timing jitters can be improved when the laser pulse undergoes adiabatic spectral compression in a dispersion-increasing fiber.
A few-mode fiber with a central depressed index region is designed for few-mode fiber parametric amplification. Such a design allows the zero dispersion wavelengths of both the LP01 and the LP11 modes shifted to the center of the C band. High gain and large bandwidth parametric amplification is demonstrate for both the LP01 and the LP11 modes in a single fiber.
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