Title :
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
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;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2011.2174193
