• Title : Variable-bandwidth Optical Paths: Comparison between Optical Code-Labeled Path and OCDM Path
• Author : Shaowei Huang, Ken-ichi Baba, Masayuki Murata, and Ken-ichi Kitayama
• Journal : IEEE J. Lightwave Technol., vol. 24, no. 10, pp.3563-3573, 2006.
• Abstract : In a conventional wavelength routed network, the bandwidth of one wavelength is considered as the minimum granularity for a given connection request. Therefore, no multiple connection requests can be accepted by using a single wavelength simultaneously. This may cause inefficiency in the bandwidth utilization in some cases. In this study, we focus on the variable bandwidth approach called optical code (OC)-based path to improve this bandwidth utilization. The concept of OC enabling paths is investigated, which shows its potential in resolving the above granularity problem inherent to wavelength-routed network. First, two optical paths, called optical code (OC)-labeled path and optical code division multiplexing (OCDM) path, are proposed. The former is based upon label switching and sta-tistical multiplexing, while the latter is based upon optical code division multiplexing. Next, OC-Label OXC and OCDM OXC are described so as to support OC-labeled path and OCDM path, respectively. In our paper, coherent time-spread OC is adopted. A two-state flow-fluid traffic model is addressed and regarded as the general analysis model. Finally, the performances between these proposed paths are qualified and compared, numerical results show that the OC-labeled path outperforms OCDM path under short burst duration time, whereas, the OCDM path provides higher flexibility than OC-labeled path owing to inde-pendence of burst duration time.

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