Design of long-period gratings: Necessity of a three-layer fiber geometry for cladding mode characteristics

作者：Singh R^*; Kumar H; Sharma EK

来源：Microwave and Optical Technology Letters, 2003, 37(1): 45-49.

DOI：10.1002/mop.10820

• long-period fiber grating
• resonances
• three-layer fiber geometry
• two-layer approximation
• erbium-doped fiber amplifiers

In this paper, we show that a complete three-layer analysis is necessary to characterise the cladding modes in order to obtain grating period, resonances, and coupling length in the design of long-period gratings (LPGs), and that the simplified two-layer fiber geometry used by many authors leads to incorrect designs. This is illustrated by design calculations corresponding to actual applications of long-period gratings as sensors and gain equalisation filters for EDFA.

• 出版日期2003-4-5