DocumentCode
778122
Title
Robustness to laser frequency offset in direct-detection DPSK and DQPSK systems
Author
Kim, Hoon ; Winzer, Peter J.
Author_Institution
Lucent Technol., Bell Labs., Holmdel, NJ, USA
Volume
21
Issue
9
fYear
2003
Firstpage
1887
Lastpage
1891
Abstract
We assess, both by measurement and simulation, the receiver performance degradation caused by frequency offsets between the optical source and the delay interferometer for nonreturn-to-zero (NRZ) and return-to-zero (RZ) differential-phase-shift-keying (DPSK) and differential-quadrature-phase-shift-keying (DQPSK) systems. We find that NRZ- and RZ-DQPSK systems are about six times more sensitive to frequency offsets than NRZ- and RZ-DPSK systems operating at the same bit rate. We explain the reason for this behavior by means of eye aperture considerations.
Keywords
differential phase shift keying; distributed feedback lasers; light interferometers; optical fibre communication; DQPSK systems; bit rate; delay interferometers; direct-detection DPSK; eye aperture considerations; frequency offsets; laser frequency offset; performance degradation; return-to-zero differential-phase-shift-keying; Bit rate; Degradation; Delay; Differential quadrature phase shift keying; Frequency measurement; Optical interferometry; Optical receivers; Optical sensors; Optical signal processing; Robustness;
fLanguage
English
Journal_Title
Lightwave Technology, Journal of
Publisher
ieee
ISSN
0733-8724
Type
jour
DOI
10.1109/JLT.2003.816816
Filename
1230167
Link To Document