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| Fältnamn | Indikatorer | Metadata |
|---|---|---|
| 000 | 02704naa a2200301 4500 | |
| 001 | oai:research.chalmers.se:6f20a3f8-efa3-4271-a317-6a14a940e06f | |
| 003 | SwePub | |
| 008 | 171007s2009 | |||||||||||000 ||eng| | |
| 024 | 7 | a https://doi.org/10.1109/JLT.2009.20290642 DOI |
| 024 | 7 | a https://research.chalmers.se/publication/1084602 URI |
| 040 | a (SwePub)cth | |
| 041 | a engb eng | |
| 042 | 9 SwePub | |
| 072 | 7 | a art2 swepub-publicationtype |
| 072 | 7 | a ref2 swepub-contenttype |
| 100 | 1 | a Agrell, Erik,d 1965u Chalmers tekniska högskola,Chalmers University of Technology4 aut0 (Swepub:cth)agrell |
| 245 | 1 0 | a Power-efficient modulation formats in coherent transmission systems |
| 264 | 1 | c 2009 |
| 338 | a electronic2 rdacarrier | |
| 520 | a Coherent optical transmission systems have a four-dimensional (4-D) signal space (two quadratures in two polarizations). These four dimensions can be used to create modulation formats that have a better power efficiency (higher sensitivity) than the conventional binary phase shift keying/quadrature phase shift keying (BPSK/QPSK) signals. Several examples are given, with some emphasis on a 24-level format and an 8-level format, including descriptions of how they can be realized and expressions for their symbol and bit error probabilities. These formats are, respectively, an extension and a subset of the commonly used 16-level dual-polarization QPSK format. Sphere packing simulations in 2, 3, and 4 dimensions, up to 32 levels, are used to verify their optimality. The numerical results, as the number of levels increases, are shown to agree with lattice-theoretical results. Finally, we point out that the use of these constellations will lead to improved fundamental sensitivity limits for optical communication systems, and they may also be relevant as a way of reducing power demands and/or nonlinear influence. © 2009, IEEE. All rights reserved. | |
| 650 | 7 | a TEKNIK OCH TEKNOLOGIERx Elektroteknik och elektronikx Telekommunikation0 (SwePub)202042 hsv//swe |
| 650 | 7 | a ENGINEERING AND TECHNOLOGYx Electrical Engineering, Electronic Engineering, Information Engineeringx Telecommunications0 (SwePub)202042 hsv//eng |
| 700 | 1 | a Karlsson, Magnus,d 1967u Chalmers tekniska högskola,Chalmers University of Technology4 aut0 (Swepub:cth)magkar |
| 710 | 2 | a Chalmers tekniska högskola4 org |
| 773 | 0 | t Journal of Lightwave Technologyg 27:22, s. 5115-5126q 27:22<5115-5126x 0733-8724x 1558-2213 |
| 856 | 4 | u http://publications.lib.chalmers.se/records/fulltext/108460/local_108460.pdfx primaryx freey FULLTEXT |
| 856 | 4 8 | u https://doi.org/10.1109/JLT.2009.2029064 |
| 856 | 4 8 | u https://research.chalmers.se/publication/108460 |
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