N G van Kampen 1981 Amsterdam: North-Holland xiv + 419 pp price Dfl 180 This is a book which, at a lower price, could be expected to become an essential part of the library of every physical scientist concerned with problems involving fluctuations and stochastic processes, as well as those who just enjoy a beautifully written book. It provides an extensive graduate-level introduction which is clear, cautious, interesting and readable.

https://iopscience.iop.org/article/10.1088/0031-9112/34/4/040/pdf

Stochastic Processes in Physics and Chemistry

A topical review of numerical and experimental studies of supercontinuum generation in photonic crystal fiber is presented over the full range of experimentally reported parameters, from the femtosecond to the continuous-wave regime. Results from numerical simulations are used to discuss the temporal and spectral characteristics of the supercontinuum, and to interpret the physics of the underlying spectral broadening processes. Particular attention is given to the case of supercontinuum generation seeded by femtosecond pulses in the anomalous group velocity dispersion regime of photonic crystal fiber, where the processes of soliton fission, stimulated Raman scattering, and dispersive wave generation are reviewed in detail. The corresponding intensity and phase stability properties of the supercontinuum spectra generated under different conditions are also discussed.

Supercontinuum generation in photonic crystal fiber

We describe a method to estimate the capacity limit of fiber-optic communication systems (or ?fiber channels?) based on information theory. This paper is divided into two parts. Part 1 reviews fundamental concepts of digital communications and information theory. We treat digitization and modulation followed by information theory for channels both without and with memory. We provide explicit relationships between the commonly used signal-to-noise ratio and the optical signal-to-noise ratio. We further evaluate the performance of modulation constellations such as quadrature-amplitude modulation, combinations of amplitude-shift keying and phase-shift keying, exotic constellations, and concentric rings for an additive white Gaussian noise channel using coherent detection. Part 2 is devoted specifically to the "fiber channel.'' We review the physical phenomena present in transmission over optical fiber networks, including sources of noise, the need for optical filtering in optically-routed networks, and, most critically, the presence of fiber Kerr nonlinearity. We describe various transmission scenarios and impairment mitigation techniques, and define a fiber channel deemed to be the most relevant for communication over optically-routed networks. We proceed to evaluate a capacity limit estimate for this fiber channel using ring constellations. Several scenarios are considered, including uniform and optimized ring constellations, different fiber dispersion maps, and varying transmission distances. We further present evidences that point to the physical origin of the fiber capacity limitations and provide a comparison of recent record experiments with our capacity limit estimation.

Capacity Limits of Optical Fiber Networks

Real and Complex Analysis

Squeezed states of the electromagnetic field have been generated by nondegenerate four-wave mixing due to Na atoms in an optical cavity. The optical noise in the cavity, comprised of primarily vacuum fluctuations and a small component of spontaneous emission from the pumped Na atoms, is amplified in one quadrature of the optical field and deamplified in the other quadrature. These quadrature components are measured with a balanced homodyne detector. The total noise level in the deamplified quadrature drops below the vacuum noise level.

Observation of squeezed states generated by four-wave mixing in an optical cavity

Existing models for inter-core crosstalk in uncoupled multi-core fibers neglect intra-core random polarization-mode coupling, and conjecture other mechanisms to justify experimental findings. In this work we show that random polarization-mode coupling can explain observed crosstalk values. Good agreement between theory and experiments is obtained.

Random Polarization-Mode Coupling Explains Inter-Core Crosstalk in Uncoupled Multi-Core Fibers

The statistics of the instantaneous frequency fluctuations of CW narrowed-linewidth single-mode semiconductor lasers are studied under the most general conditions. In the case in which the rate equations describing the evolution of the system cannot be linearized the statistics are found to deviate appreciably from a Gaussian distribution. A Monte Carlo simulation is shown to give results in good agreement with previous experimental measurements. >

Non-Gaussian statistics of frequency fluctuations in line-narrowed semiconductor lasers

In this letter, we present a numerical investigation of impairments due to polarization-mode dispersion (PMD) in chaos-encrypted communication systems. We show that PMD could affect master-slave synchronization, hence degrading system performance at typical PMD values of deployed fiber plants. We also analyze the effectiveness of a first-order compensation.

Impairments Due to Polarization-Mode Dispersion in Chaos-Encrypted Communication Systems

We present the theory of Raman amplification in multi-mode fiber structures in the framework of space-division multiplexed transmission. Random linear coupling between the various fiber modes plays a critical role in the process of amplification by equalizing the Raman gain within quasi-degenerate mode groups.

Modeling Raman amplification in multimode and multicore fibers

We compare fluctuations of propagation delay and inter-core skew on spooled and field-deployed multicore fibers. Our observations show a reduction of propagation delay fluctuations over deployed fibers but similar inter-core skew behavior.

Antonio Mecozzi

Papers

Random Polarization-Mode Coupling Explains Inter-Core Crosstalk in Uncoupled Multi-Core Fibers

Non-Gaussian statistics of frequency fluctuations in line-narrowed semiconductor lasers

Impairments Due to Polarization-Mode Dispersion in Chaos-Encrypted Communication Systems

Modeling Raman amplification in multimode and multicore fibers

Evaluation of Dynamic Skew on Spooled and Deployed Multicore Fibers using O-Band Signals