发明名称 |
Node apparatus, optical wavelength division multiplexing network, and system switching method |
摘要 |
An optical wavelength division multiplexing network has a multi-level structure where a plurality of optical network units (ONUs) are connected to a lowest-level network. A node apparatus connected to networks other than the lowest-level network includes (a) passive optical components to branch optical signals from a higher-level network to a lower-level network, and couple optical signals from the lower-level network to the higher-level network, and (b) optical amplifiers for the optical signals. A node apparatus connected to the lowest-level network includes (a) an optical multiplexer/de-multiplexer to de-multiplex optical signals from the higher-level network, selectively output an optical signal to each ONU, and multiplex wave-length specific optical signals from the ONUs into a multiplexed optical signal, and (b) optical amplifiers for the optical signals. The node apparatuses provide an optical communication path between the higher-level network and the lower-level (or lowest-level) network without converting the optical signals into electrical signals.
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申请公布号 |
US7433594(B2) |
申请公布日期 |
2008.10.07 |
申请号 |
US20060580568 |
申请日期 |
2006.10.12 |
申请人 |
NIPPON TELEGRAPH AND TELEPHONE CORPORATION |
发明人 |
TAKACHIO NOBORU;IWATSUKI KATSUMI;OBARA HITOSHI |
分类号 |
H04B10/00;H04B10/20;H04B10/02;H04B10/213;H04J14/00;H04J14/02;H04Q3/52;H04Q11/00 |
主分类号 |
H04B10/00 |
代理机构 |
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