In this paper, we propose a hybrid pulse position modulation/ultrashort light pulse code-division multiple-access (PPM/ULP-CDMA) system for ultrafast optical communications. The proposed system employs spectral CDMA encoding/decoding and PPM with very short pulse separation. The statistical properties of the encoded ULP are investigated with a general pulse model, and the performance of the proposed PPM/ULP-CDMA system is investigated. It is shown that we can improve upon the performance of other ULP-CDMA systems, such as those using on-off keying, by employing PPM. It is also shown that we can improve the performance of the proposed system by increasing the effective number of chips, by increasing the number of PPM symbols, and by reducing the ULP duration. The performance analysis shows that the aggregate throughput of the proposed PPM/ULP-CDMA system could be over 1 Tb/s.
Bibliographical noteFunding Information:
Paper approved by I. Andonovic, the Editor for Optical Networks and Devices of the IEEE Communications Society. Manuscript received May 17, 2001; revised March 25, 2002. This work was supported by National Science Foundation (NSF). The work of K. S. Kim and D. M. Marom was supported by the Korea Science and Engineering Foundation (KOSEF) and the Fannie and John Hertz Foundation, respectively.
All Science Journal Classification (ASJC) codes
- Electrical and Electronic Engineering