[OPTICAL REVIEW Vol. 17, No. 1 (2010) 1-4]
© 2010 The Japan Society of Applied Physics

Single Resonant and Widely Tunable Ultrathin Cladding Long-Period Fiber Grating Filters

Cheng-Ling LEE*, Pin-Cheng WU, and Li-Wei LIU

Department of Electro-Optical Engineering and Optoelectronics Research Center, National United University, No. 1 Lien-Da, Kung-Ching Li, Miaoli 360, Taiwan, R.O.C.

(Received August 27, 2009; Accepted November 30, 2009)

A spectrally single resonant and widely tunable, ultrathin cladding long-period fiber grating (UCLPG) is demonstrated in the present paper. Both experimental and theoretical analyses of the characteristics for the proposed device are accomplished. Since the single resonant and widely tunable characteristics of the proposed UCLPG are strongly influenced by the waveguide structure and surrounding material, both material dispersion and waveguide dispersion were included in the calculation for determining the wideband tuning range and resonant spectra of the UCLPG. The tuning range covered wavelength from 1.41 to 1.56 μm for the variation of refractive index of 1–1.445 (optical liquid nD=1.456 for λ = 1.5 μm) is achieved in the study.

Key words: ultrathin cladding long-period fiber grating (UCLPG), dispersion, sensor

*E-mail address: cherry@nuu.edu.tw