Role of optical CDMA in access networks
Summary :
Table of Contents
- Abstract
- Introduction
- Optical CDMA for access networks
- Fair division of bandwidth
- Flexibility
- Network control and management
- Service differentiation
- Security
- Technological barriers to acceptance
- Shot and beat noise
- Forward error correction
- Cost barriers
- Encoding and decoding hardware
- Broadband light source
- Perception barriers
- Inefficient optical CDMA
- Conclusion
- References
Abstract
optical code-division multiple access (OCDMA) combines the large bandwidth of the fiber medium with the flexibility of the cdma technique to achieve high-speed connectivity. cdma was originally investigated in the context of radio frequency communications systems, and was first applied to the optical domain in the mid-1980s [1]. Researchers sought to use the excess bandwidth in single-mode fibers to achieve random asynchronous operation without the need for a centralized network controller.
In an O-cdma system, each bit is divided up into n time periods, called chips. By sending a short optical pulse during some chip intervals, but not others, an optical signature sequence, or codeword, can be created. Each user on the O-cdma system has a unique signature sequence.
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