In this paper, we review different designs of distributed Raman amplifiers which have been
proposed to minimize the signal power profile asymmetry in mid-link optical phase …

The ability to process optical signals without passing into the electrical domain has always
attracted the attention of the research community. Processing photons by photons unfolds …

Current optical fibre transmission systems rely on modulation, coding and multiplexing
techniques that were originally developed for linear communication channels. However …

We report the first experimental realization and detailed characterization of thulium doped
fiber amplifiers (TDFAs) specifically designed for optical communications providing high …

In this paper, we review the historical evolution of predictions of the performance of optical
communication systems. We will describe how such predictions were made from the outset …

New services and applications are causing an exponential increase in Internet traffic. In a
few years, the current fiber optic communication system infrastructure will not be able to …

The capacity and reach of long-haul fiber optical communication systems is limited by in-line
amplifier noise and fiber nonlinearities. Phase-sensitive amplifiers add 6 dB less noise than …

The optical parametric amplifier (OPA) has attractive features for optical communications,
such as a wideband, high gain, and fast transient response. In addition, by using idler light …

Optical parametric amplifiers rely on second-order susceptibility (three-wave mixing) or third-
order susceptibility (four-wave mixing) in a nonlinear process where the energy of incoming …

We demonstrate fiber nonlinearity mitigation by using multiple optical phase conjugations
(OPCs) in the WDM transmission systems of both 8× 32-Gbaud PDM QPSK channels and 8× …