Abstract

Fiber gratings are playing important roles in the optical communications and sensor systems.¹ The fabrication techniques of fiber gratings have achieved greatly progress. The techniques mostly used include phase mask technique,² holography³ and point-by-point writing technique.⁴ The phase mask technique has been widely used due to its advantages of lower requirements on stability of photo-imprinting apparatus and coherence of ultraviolet light source, But it also has disadvantages, for example, different phase masks are required for different wavelengths correspondingly.

© 2001 Optical Society of America