Abstract
A novel approach for an optical direct-sequence spread spectrum is presented. It is based on the complementary processes of broad-band parametric down-conversion and up-conversion. With parametric down-conversion, a narrow-band continuous-wave (CW) optical field is transformed into two CW broad-band white-noise fields that are complex conjugates of each other. These noise fields are exploited as the key and conjugate key in optical direct-sequence spread spectrum. The inverse process of parametric up-conversion is then used for multiplying the key by the conjugate key at the receiver in order to extract the transmitted data. A complete scheme for optical code-division multiple access (OCDMA) based on this approach is presented. The salient feature of the approach presented in this paper is that an ideal white-noise key is automatically generated, leading to high-capacity versatile code-division multiple-access configurations.
| Original language | English |
|---|---|
| Pages (from-to) | 1463-1471 |
| Number of pages | 9 |
| Journal | Journal of Lightwave Technology |
| Volume | 22 |
| Issue number | 6 |
| DOIs | |
| State | Published - Jun 2004 |
| Externally published | Yes |
Bibliographical note
Funding Information:Manuscript received November 10, 2003; revised February 12, 2004. This work was supported in part by the Yeda Research and Development Company, Limited, The Weizmann Institute of Science, Rehovot, Israel.