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  ____       ___       _____    _____             
 |  _ \\    / _ \\    / ___//  |  ___||   ____    
 | |_| ||  / //\ \\   \___ \\  | ||__    |    \\  
 | .  //  |  ___  ||  /    //  | ||__    | [] ||  
 |_|\_\\  |_||  |_|| /____//   |_____||  |  __//  
 `-` --`  `-`   `-` `-----`    `-----`   |_|`-`   
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發送短信 : SNR enhancement in OTDR using pulse coding