Conference proceeding
4x4 space-time codes for free-space optical interconnects
Proceedings of SPIE, v 7221(1), pp 722116-722118
12 Feb 2009
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Currently, free space optical interconnect systems can be severely limited by optical crosstalk that can arise due to unfocused systems and misalignments between transmitter and receiver elements. To address this limitation, space-time codes, largely developed for radio frequency channels, are adapted for use in a free space optical interconnect system. We have extended space-time coding for a 4x4 optical channel based on on-off keying that uses real intensity-based signals. These codes improve system performance by taking advantage of the optical crosstalk in a system composed of multiple transmitters and receivers. Data is encoded by space-time codes based on orthogonal designs and is split into four streams that are simultaneously transmitted using four transmitters with the same wavelength. The received signal at each of the four optical receivers is a superposition of the transmitted signals with the addition of noise. Decision metrics are calculated making use of the received signals and the optical path gains which are determined using channel training. These metrics, in conjunction with maximum likelihood decoding, decouple the individual signals transmitted from different transmitters. Use of the modified codes based on orthogonal designs allows for simple maximum likelihood decoding based on minimum Euclidean distance. Simulated results show that our system can achieve a low BER on the order of 10
even in case of a substantial misalignment between the transmitter and receiver.
Metrics
Details
- Title
- 4x4 space-time codes for free-space optical interconnects
- Creators
- Sai V Chinta - Drexel Univ. (USA)Timothy P Kurzweg - Drexel Univ. (USA)Douglas S Pfeil - Drexel Univ. (USA)Kapil R Dandekar - Drexel Univ. (USA)
- Publication Details
- Proceedings of SPIE, v 7221(1), pp 722116-722118
- Conference
- Photonics Packaging, Integration, and Interconnects IX, 9th
- Publisher
- Society of Photo-Optical Instrumentation Engineers (SPIE)
- Resource Type
- Conference proceeding
- Language
- English
- Academic Unit
- Electrical and Computer Engineering
- Web of Science ID
- WOS:000285747700033
- Scopus ID
- 2-s2.0-66749159704
- Other Identifier
- 991014878196804721
UN Sustainable Development Goals (SDGs)
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InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Web of Science research areas
- Engineering, Electrical & Electronic
- Nanoscience & Nanotechnology
- Optics