In Part I of this two-part paper, we proposed and investigated a hybrid pulse position modulation/ultrashort light pulse code-division multiple-access (PPM/ULP-CDMA) system for ultrafast optical communication networks. In the proposed scheme, the large bandwidth of an ULP is efficiently utilized by virtue of the very high time resolution of a time-space processor. In this paper, more detailed analysis and discussion on the receiver scheme using the time-space, processor is presented; nonideal performance of the time-space processor, including the reference pulse realization problem, as well as amplifier and detector noise, are taken into account. Discussions on physically achievable ranges of the system parameters that determine the performance of the proposed PPM/ULP-CDMA system are also made based upon current, state of the art technology. As remedies to overcome the physical limitations on the system parameters, two modified modulation/demodulation schemes are proposed and investigated to enhance the performance of the hybrid PPM/ULP-CDMA system.
Bibliographical noteFunding Information:
Paper approved by J. A. Salehi, the Editor for Optical CDMA of the IEEE Communications Society. Manuscript received May 24, 2001; revised August 23, 2002. This work was supported by the National Science Foundation under Grant NSF-9813721 and under Grant NSF-0123405. 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