Abstract

Effective refractive indexes of the core mode and various cladding modes of a tapered single-mode step-index fiber were calculated for identifying the cladding modes of phase matching for coupling with the core mode, caused by a prewritten Bragg grating together with an applied flexural wave (microbending) in the tapered region. With these coupling mechanisms, the previously reported reflection wavelength switching could be well interpreted. Between the core mode and a cladding mode, the Bragg grating caused contradirectional coupling and the flexural wave resulted in codirectional coupling of either first-or second-order diffraction. Meanwhile, the period of the acoustic-induced flexural wave was calibrated to be a few hundreds of micrometers. Based on the phase-matching calculations, the relationship between cladding radius and flexural wave period with a chosen wavelength for reflection switching was provided. Such design considerations should be helpful in implementing wavelength switches, based on flexural wave modulation of fiber Bragg grating (FBG), for the applications of wavelength division multiplexing (WDM) fiber communications.

© 2002 IEEE

Numerical analysis and optimization of optical spectral characteristics of fiber Bragg gratings modulated by a transverse acoustic wave

Zhengqian Luo, Chenchun Ye, Zhiping Cai, Xianzhe Dai, Yun Kang, and Huiying Xu
Appl. Opt. 46(28) 6959-6965 (2007)

All-fiber frequency shifter consisting of a fiber Bragg grating modulated via an acoustic flexural wave for optical heterodyne measurement

Zeyang Gao, Pengfa Chang, Ligang Huang, Feng Gao, Dong Mao, Wending Zhang, and Ting Mei
Opt. Lett. 44(15) 3725-3728 (2019)

Acoustic-induced switching of the reflection wavelength in a fiber Bragg grating

Wen-Fung Liu, I-Ming Liu, Lung-Wei Chung, Ding-Wei Huang, and C. C. Yang
Opt. Lett. 25(18) 1319-1321 (2000)

Analysis of solving multimode-coupled equations and its improvement for modulated fiber Bragg gratings

Fatemeh Abrishamian, Shinya Sato, and Masaaki Imai
Appl. Opt. 48(20) 4031-4037 (2009)

Analysis of optical switching in a Yb³⁺-doped fiber Bragg grating by using self-phase modulation and cross-phase modulation

Zhigang Zang and Yujun Zhang
Appl. Opt. 51(16) 3424-3430 (2012)