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

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Text this: In-line Mach-Zehnder interferometer composed of microtaper and long-period grating in all-solid photonic bandgap fiber