Methods and apparatuses for packaging long-period fiber gratings

A method for forming an optical waveguide device comprising the steps of:

• providing a tube having an inner wall and defining a cavity, said cavity having a first predetermined diameter;
• providing an optical fiber of a second predetermined diameter, wherein said second predetermined diameter is less than said first predetermined diameter;
• inserting said optical fiber into said cavity;
• collapsing a first section of said tube to form a first collapsed section with said inner wall contacting said optical fiber in a first location such that a first seal is formed;
• collapsing a second section of said tube to form a second collapsed section with said inner wall contacting said optical fiber in a second location such that a second seal is formed, and a length of said optical fiber is held between said first collapsed section and second collapsed section;
• providing a first epoxy plug disposed in a first end of the tube and a second epoxy plug disposed in a second end of the tube.