An optical interconnection network for terabit IP routers
| Autor: | Hung-Hsiang Jonathan Chao, Ti-Shiang Wang |
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| Rok vydání: | 2000 |
| Předmět: | |
| Zdroj: | Journal of Lightwave Technology. 18:2095-2112 |
| ISSN: | 1558-2213 0733-8724 |
| DOI: | 10.1109/50.908820 |
| Popis: | As data traffic increases exponentially in the Internet, a need of deploying ATM switches or IP routers with terabit/s capacity is emerging. By taking advantage of the advanced wavelength division multiplexing (WDM) technology, we propose a nonblocking WDM-based optical interconnection network (OIN) to interconnect multiple electronic router modules (RMs), where packets are stored and processed. The proposed architecture uses an input-output buffering scheme, where the OIN operates at twice the line rates to alleviate the head-of-line blocking and thus achieves close to 100% throughput. The OIN is capable of performing multicasting using the method of broadcast and select. Output port contention among the input packets is resolved by a novel ping-pong arbitration (PPA) scheme. For a 256-input packet switch, the arbitration can be completed within 11 gates delay, less than 5 ns using the current CMOS technology. We analyze the complexity of the OIN in optical components and interconnections, its power budget, and crosstalk caused by the finite ON-OFF ratio of optical switching gates. Bit error rates with respect to different ON-OFF ratios and extinction ratios are evaluated by simulations. The result shows that it is feasible to construct a 256/spl times/256 OIN with existing technology. |
| Databáze: | OpenAIRE |
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