Optical intensity-modulated direct detection channels: signal space and lattice codes

Traditional approaches to constructing constellations for electrical channels cannot be applied directly to the optical intensity channel. This work presents a structured signal space model for optical intensity channels where the nonnegativity and average amplitude constraints are represented geome...

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Bibliographic Details
Published inIEEE transactions on information theory Vol. 49; no. 6; pp. 1385 - 1399
Main Authors Hranilovic, S., Kschischang, F.R.
Format Journal Article
LanguageEnglish
Published New York IEEE 01.06.2003
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Bandwidth
Biomedical optical imaging
Channels
Codes
Coding
Computation
Constellations
Construction
Electric power generation
Gain
Information systems
Lattices
Optical detectors
Optical distortion
Optical fiber communication
Optical modulation
Optical transmitters
Pulse modulation
Signal detection
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Summary:Traditional approaches to constructing constellations for electrical channels cannot be applied directly to the optical intensity channel. This work presents a structured signal space model for optical intensity channels where the nonnegativity and average amplitude constraints are represented geometrically. Lattice codes satisfying channel constraints are defined and coding and shaping gain relative to a baseline are computed. An effective signal space dimension is defined to represent the precise impact of coding and shaping on bandwidth. Average optical power minimizing shaping regions are derived in some special cases. Example lattice codes are constructed and their performance on an idealized point-to-point wireless optical link is computed. Bandwidth-efficient schemes are shown to have promise for high data-rate applications, but require greater average optical power.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0018-9448
1557-9654
DOI:10.1109/TIT.2003.811928