Abstract
An extremely short long-period grating (LPG) with strong resonance has been developed in a large-mode-area photonic crystal fiber (PCF) by use of the heat source of a laser. We believe that such a LPG in pure silica PCF is the first example to be obtained with the point-by-point technique. The fabrication method is simple and repeatable. The resulting LPG has 8 periods, written by a laser, within a 2.8-mm length of fiber, which yields a deep notch of core–cladding mode coupling of at the telecommunication wavelength of 1529.2 nm, with a FWHM of . The principal advantages of this LPG are that it is practical, cost effective, and compact.
© 2003 Optical Society of America
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