Noncoherent detection of coherent optical heterodyne signals corrupted by laser phase noise
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Authors
Varnum, Kent C. M.
Subjects
Optical heterodyne communications
OOK modulation
FSK modulation
OOK modulation
FSK modulation
Advisors
Robertson, R. Clark
Ha, Tri T.
Date of Issue
1991-03
Date
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
An error probability analysis is performed for noncoherent detection of optical
heterodyne signals corrupted by laser phase noise and additive white Gaussian noise.
Two types of laser modulation are investigated, on-off keying (00K) and frequency
shift keying (FSK).
Single user 00K system performance for different linewidth-to-bit rate ratios
is analyzed over a range of both signal-to-noise ratios (SNR) and normalized decision
thresholds. The decision threshold analysis illustrates which noise source dominates
system performance. An analytical expression representing the effect of laser phase
noise on system performance is derived based on a high user bit rate assumption. The
system performance obtained with the high bit rate expression is compared with the
system performance obtained with currently used expressions to determine its range
of validity. An error probability analysis is then performed for noncoherent detection of
FSK signals corrupted by laser phase noise and additive white Gaussian receiver
noise. The performance of the FSK system is compared with the performance of the
00K system. It is shown that optical FSK systems perform better than optical 00K
systems.
As a demonstration of future system capability, the performance of a multiuser
FSK code-division multiple access (FSK-CDMA) system is analyzed. The results obtained
indicate that the application of FSK-CDMA techniques to current wavelength
division multiplexed (WDM) systems can increase user capacity up to one thousand
fold.
Type
Thesis
Description
Series/Report No
Department
Electrical Engineering
Organization
Naval Postgraduate School
Identifiers
NPS Report Number
Sponsors
Funder
Format
Citation
Distribution Statement
Approved for public release; distribution is unlimited.