| Optical Broadcast-and-Select Network Architecture with Centralized Multi-Carrier Light Source Recent countries visiting this post |  |
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| Optical Broadcast-and-Select Network Architecture with Centralized Multi-Carrier Light Source Recent countries visiting this post | |
| 18 | United States |
| 1 | |
| 1 | Pakistan |
| 1 | India |
| 1 | China |