Coherent detection in optical fiber systems
TL;DR: This work reviews detection methods, including noncoherent, differentially coherent, and coherent detection, as well as a hybrid method, and compares modulation methods encoding information in various degrees of freedom (DOF).
read more
Abstract: The drive for higher performance in optical fiber systems has renewed interest in coherent detection. We review detection methods, including noncoherent, differentially coherent, and coherent detection, as well as a hybrid method. We compare modulation methods encoding information in various degrees of freedom (DOF). Polarization-multiplexed quadrature-amplitude modulation maximizes spectral efficiency and power efficiency, by utilizing all four available DOF, the two field quadratures in the two polarizations. Dual-polarization homodyne or heterodyne downconversion are linear processes that can fully recover the received signal field in these four DOF. When downconverted signals are sampled at the Nyquist rate, compensation of transmission impairments can be performed using digital signal processing (DSP). Linear impairments, including chromatic dispersion and polarization-mode dispersion, can be compensated quasi-exactly using finite impulse response filters. Some nonlinear impairments, such as intra-channel four-wave mixing and nonlinear phase noise, can be compensated partially. Carrier phase recovery can be performed using feedforward methods, even when phase-locked loops may fail due to delay constraints. DSP-based compensation enables a receiver to adapt to time-varying impairments, and facilitates use of advanced forward-error-correction codes. We discuss both single- and multi-carrier system implementations. For a given modulation format, using coherent detection, they offer fundamentally the same spectral efficiency and power efficiency, but may differ in practice, because of different impairments and implementation details. With anticipated advances in analog-to-digital converters and integrated circuit technology, DSP-based coherent receivers at bit rates up to 100 Gbit/s should become practical within the next few years.
read more
Chat with Paper
AI Agents for this Paper
Find similar papers on Google Scholar, PubMed and Arxiv
Write a critical review of this paper
Analyze citations of this paper to find unaddressed research gaps
Citations
Statistical model for free-space optical coherent communications using adaptive optics
Esdras Anzuola,Szymon Gladysz +1 more
- 21 Oct 2016
TL;DR: In this paper, the authors presented a new model for describing the turbulence-induced fading that uses the representation of the phase in the aperture plane as a collection of random "cells" to calculate the probability density function of fading intensity.
6
A dual-polarization coherent communication system with simplified optical receiver for UDWDM-PON architecture.
Jianyu Zheng,Feng Lu,Mu Xu,Ming Zhu,Ibrahim Khalil,Xu Bao,Daniel Guidotti,Jianguo Liu,Ninghua Zhu,Gee-Kung Chang +9 more
TL;DR: A dual-polarization coherent heterodyne optical communication system using a simplified and low-cost demodulation scheme, for high-capacity UDWDM-PON access networks, is proposed and demonstrated and the experimental results are consistent with theoretical predictions.
6
Phase noise mitigation by a realistic optical parametric oscillator
TL;DR: In this paper , an optical parametric oscillator (OPO) was used to mitigate phase noise produced by phase diffusion in optical field measurements and quantum estimation of a phase shift imposed on a noisy probe.
6
Comparison of nonlinear fiber-based approaches for all-optical clock recovery at 40 Gb/s
TL;DR: In this paper, the authors compared two different nonlinear fiber-based approaches for all-optical clock recovery (AOCR) at 40 giga giga bit per second (Gb/s).
6
Towards Compact and High Speed Silicon Modulators
Brimont,Antoine Christian Jacques +1 more
- 02 Feb 2012
TL;DR: In this paper, a trabajo realizado en el diseno, the fabricación and the caracterización of estructuras de onda lenta with the goal of realizar moduladores compactos and eficientes integrados in a chip de silicio is presented.
References
A mathematical theory of communication
TL;DR: This final installment of the paper considers the case where the signals or the messages or both are continuously variable, in contrast with the discrete nature assumed until now.
74.4K
Multiuser OFDM with adaptive subcarrier, bit, and power allocation
TL;DR: The results show that the proposed algorithm outperforms multiuser OFDM systems with static time-division multiple access (TDMA) or frequency-divisionmultiple access (FDMA) techniques which employ fixed and predetermined time-slot or subcarrier allocation schemes.
Adaptive equalization
TL;DR: In this article, the authors give an overview of the current state of the art in adaptive equalization and discuss the convergence and steady-state properties of least mean square (LMS) adaptation algorithms.
1.3K
•Book
Infrared and optical masers
Arthur L. Schawlow,Charles H. Townes +1 more
- 01 Jan 1958
TL;DR: In this article, it was shown that by using a resonant cavity of centimeter dimensions, having many resonant modes, maser oscillation at these wavelengths can be achieved by pumping with reasonable amounts of incoherent light.
1.2K
Adaptive equalization
S.U.H. Qureshi
- 01 Sep 1985
TL;DR: This tutorial paper gives an overview of the current state of the art in adaptive equalization and discusses the convergence and steady-state properties of least mean-square (LMS) adaptation algorithms, including digital precision considerations, and three classes of rapidly converging adaptive equalizer algorithms.
1.1K