發送短信 : Function of second cladding layer in hollow core tube lattice fibers

  _  __     ___     _    _     _____     ______  
 | |/ //   / _ \\  | || | ||  |  ___||  /_____// 
 | ' //   | / \ || | || | ||  | ||__    `____ `  
 | . \\   | \_/ || | \\_/ ||  | ||__    /___//   
 |_|\_\\   \___//   \____//   |_____||  `__ `    
 `-` --`   `---`     `---`    `-----`   /_//     
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