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  ______   _    _      _____     ___     _____    
 /_____// | || | ||   / ___//   / _ \\  |  __ \\  
 `____ `  | || | ||   \___ \\  / //\ \\ | |  \ || 
 /___//   | \\_/ ||   /    // |  ___  ||| |__/ || 
 `__ `     \____//   /____//  |_||  |_|||_____//  
 /_//       `---`   `-----`   `-`   `-`  -----`   
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Text this: Truyền và dẫn sóng quang