Bright prospects for erbium-doped fiber amplifiers in future lightwave communication systems

A perturbation method for analyzing multisoliton interaction

“…The first is the active mode-locked method with an intensity/phase modulator within the fiber ring [4]. Another method is passive mode lock with the use of the nonlinear Kerr effect in the fiber, which 26 MICROWAVE AND OPTICAL TECHNOLOGY LETTERS / Vol 12, includes the nonlinear polarization rotation [5], or a nonlinear fiber-loop mirror [6]. In this Letter, we propose a novel Er-doped fiber laser to generate an output pulse that can be simply adjusted by controlling the amplitude voltage of an applied phase modulation signal.…”

“…There are several approximate methods for the potential corresponding to two solitons, that is, perturbation methods [3, 41, and variational methods [51. To the best of the authors' knowledge only purely numerical methods [6] appear in the literature for the general case of the potential corresponding to more than two solitons.…”

BER Floor Due to Modulation Instability in a 2.5 Gbit/s Field Trial with +22 dBm Booster EDFA

“…The MI-ASE introduces two types of noises, similar to the ASE-signal beat noise and ASE-ASE beat noise in optical amplifier systems [15]. The MI-ASE-MI-ASE beat noise was calculated directly from the measured spectrum of Fig.…”

“…We made a calculation of the signal-to-noise ratio (Q-factor) based on the analysis of [15]. The optical spectrum of Fig.…”

Optimization of a two-stage erbium-doped fiber amplifier with large-signal input power and pump lasers with moderate power

“…New system applications requirements have led to the development of multistage optical amplifiers [4, 51. However, these designs may involve a complex optical circuitry [6].…”