Hybrid pulse position modulation/ultrashort-light-pulse code division multiple access for data networking

Daniel M. Marom; Kwang Soon Kim; Laurence B. Milstein; Yeshaiahu Fainman

doi:10.1117/12.386867

24 May 2000 Hybrid pulse position modulation/ultrashort-light-pulse code division multiple access for data networking

Daniel M. Marom, Kwang Soon Kim, Laurence B. Milstein, Yeshaiahu Fainman

Proceedings Volume 4089, Optics in Computing 2000; (2000) https://doi.org/10.1117/12.386867
Event: 2000 International Topical Meeting on Optics in Computing (OC2000), 2000, Quebec City, Canada

Abstract

Future data networks are required to support numerous high- capacity connections while providing simplified management and connectivity. To meet these requirements, we propose to utilize broadband ultrashort light pulses (ULP) in conjunction with pulse position modulation (PPM) as an efficient modulation format and code division multiple access (CDMA) for interference suppression. This networking format is operated asynchronously for simplified control, and requires minimal management for ensuring that the number of active users is below the limit at which multi-user interference generates excessive errors. The pulse positions can be detected at the receiver with high temporal resolution by utilizing a time-to-space conversion operating in real-time. The performance of the PPM/ULP-CDMA is found to depend on the following parameters: the ULP duration, the bandwidth of each spectral chip of the CDMA filter, and the ULP repetition time. We find that employing PPM improves the performance of the system relative to On-Off Keying. The performance can be further improved by increasing the number of PPM symbols, reducing the spectral chip bandwidth, and reducing the ratio of the pulse duration to repetition time. The performance analysis shows that the proposed system operates at a high bandwidth efficiency.

Citation Download Citation

Daniel M. Marom, Kwang Soon Kim, Laurence B. Milstein, and Yeshaiahu Fainman "Hybrid pulse position modulation/ultrashort-light-pulse code division multiple access for data networking", Proc. SPIE 4089, Optics in Computing 2000, (24 May 2000); https://doi.org/10.1117/12.386867

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KEYWORDS

Modulation

Optical filters

Computer programming

Signal detection

Ultrafast phenomena

Code division multiplexing

Signal processing

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