Continuous Phase Modulation for Fiber-Optic Links

Author

Detwiler, Thomas F. ; Searcy, Steven M. ; Ralph, Stephen E. ; Basch, Bert

Author_Institution

Georgia Inst. of Technol., Atlanta, GA, USA

Volume

29

Issue

24

fYear

2011

Firstpage

3659

Lastpage

3671

Abstract

Advances in photonics, silicon electronics and digital signal processing (DSP) have converged to enable highly efficient transmission across fiber optic channels. Single wavelength data rates of 112 Gb/s are sought for wide deployment based on QPSK transmission, coherent detection, and digital demodulation. Here we examine continuous phase modulation (CPM) as a means to enhance performance and reach of coherent optical links. We quantify the robustness of the constant amplitude CPM format to spectral filtering and nonlinearities in comparison to QPSK. The challenges of generating and receiving the CPM waveform are considered and a novel CPM transmitter architecture is proposed.

Keywords

light coherence; optical fibre networks; optical filters; optical links; optical modulation; optical transmitters; phase modulation; quadrature phase shift keying; QPSK transmission; bit rate 112 Gbit/s; coherent detection; coherent optical links; constant amplitude format; continuous phase modulation; digital demodulation; digital signal processing; fiber optic channels; fiber-optic links; silicon electronics; spectral filtering; transmitter architecture; wavelength data rates; Optical fiber networks; Optical filters; Optical modulation; Optical transmitters; Phase shift keying; 100 Gb/s ethernet; continuous phase modulation (CPM); optical networking;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/JLT.2011.2174193

Filename

6068212