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  ______    _____    _    _      ___              
 /_   _//  |  ___|| | |  | ||   / _ \\    ____    
   | ||    | ||__   | |/\| ||  | / \ ||  |    \\  
  _| ||    | ||__   |  /\  ||  | \_/ ||  | [] ||  
 /__//     |_____|| |_// \_||   \___//   |  __//  
 `--`      `-----`  `-`   `-`   `---`    |_|`-`   
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Text this: Symmetric 10-Gb/s WDM-PON using directly modulated lasers for downlink and RSOAs for uplink