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
Carrier-suppressed modulation and self-mixing demodulation for vibration measurement
TL;DR: The achievement of carrier suppression and vibration measurement is experimentally demonstrated, and the result closely agrees with the theoretical predictions.
2
RSOA-based colorless multilevel transmitter with electrical signal predistortion
Angelina Totovic,Angelina Totovic,Marco Santagiustina,Cristian Antonelli,Dejan M. Gvozdić,Paola Parolari,Pierpaolo Boffi +6 more
TL;DR: The design and a numerical proof-of-concept of an RSOA-based colorless multilevel transmitter suitable for use in optical network units at user premises are presented and it is numerically confirmed that 4-QAM operation is possible without the modulation signal predistortion.
2
Coherent Optical Transmission Systems: Performance and Coding Aspects
Miu Yoong Leong
- 01 Jan 2015
TL;DR: This research presents a meta-modelling architecture that automates the very labor-intensive and therefore time-heavy and therefore expensive and expensive process of designing and installing and operating fiber opticoptic systems.
Theoretical and experimental demonstration on narrow-linewidth DFB laser utilizing equivalent CPM-apodized grating
Xiang Tian,Yunshan Zhang,Yuechun Shi,Jilin Zheng,Jun Lu,Wenxuan Wang,Xiangfei Chen +6 more
- 01 Sep 2016
TL;DR: In this article, a low-cost narrow-linewidth DFB laser with equivalent CPM-apodized grating was demonstrated, which was fabricated by the reconstruction-equivalent-chirp (REC) technique based on conventional holograph exposure combined with lithograph technology.
2
Phase Noise Reduction of a Laser Source by External Phase Compensation
Ha Trong Thuy,Yong-Yuk Won,Dongsun Seo +2 more
- 01 Aug 2019
TL;DR: Based on direct phase noise compensation utilizing an external phase modulator, the authors reduce the laser spectral width from 450 kHz to 60 kHz and detect directly 5 G-symbol/s binary and quaternary phase shift keying signals without digital signal processing electronics.
2
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