Flexural waves on fiber and fiber Bragg gratings for WDM switching and gain equalization of erbium-doped fiber amplifiers

Chih Chung Yang; Chih-Nan Lin; Chung-Yih Tang; Yan-Ju Chiang; Yean-Woei Kiang; Chih-Cheng Chou; Nai-Hsiang Sun; Chih-An Wei; Wen-Fung Liu; I-Ming Liu; Lung-Wei Chung; Ding-Wei Huang

doi:10.1117/12.444877

19 October 2001 Flexural waves on fiber and fiber Bragg gratings for WDM switching and gain equalization of erbium-doped fiber amplifiers

Chih Chung Yang, Chih-Nan Lin, Chung-Yih Tang, Yan-Ju Chiang, Yean-Woei Kiang, Chih-Cheng Chou, Nai-Hsiang Sun, Chih-An Wei, Wen-Fung Liu, I-Ming Liu, Lung-Wei Chung, Ding-Wei Huang

Author Affiliations +

Proceedings Volume 4579, Optical Fiber and Planar Waveguide Technology; (2001) https://doi.org/10.1117/12.444877
Event: Asia-Pacific Optical and Wireless Communications Conference and Exhibit, 2001, Beijing, China

Abstract

Flexural waves on fiber and fiber Bragg gratings generated with applied ultrasounds and loading were used for switching the reflection wavelength of fiber Bragg grating and for controlling the transmission spectra of fiber. By producing lateral vibration of a fiber Bragg grating, which has been etched in cladding, it was found that the reflection wavelength could be switched from the Bragg wavelength to other wavelengths, which corresponded to the conditions of strong coupling between core mode and cladding modes. By adjusting the applied voltage for acoustic waves, the relative strength of different reflection wavelengths could be well adjusted. Theoretical analysis of phase-matching condition indicated that the diameter of etched cladding played a key role in controlling the switched reflection wavelength. Flexural waves were also generated on fiber by applying loading with one or two periodically corrugated plates. By adjusting the orientation of the periodical corrugation, loading level, and the relative position of the two corrugated plates, depressions of transmission spectrum at various wavelengths could be well controlled. The spectral depressions were caused by the coupling between core mode and various cladding modes. Such depressions were used for gain equalization of erbium-doped fiber amplifiers. The equalization operation was more efficient with curved fiber under loading. Control of fiber curvature for various forms of spectral depression will be discussed.

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Chih Chung Yang, Chih-Nan Lin, Chung-Yih Tang, Yan-Ju Chiang, Yean-Woei Kiang, Chih-Cheng Chou, Nai-Hsiang Sun, Chih-An Wei, Wen-Fung Liu, I-Ming Liu, Lung-Wei Chung, and Ding-Wei Huang "Flexural waves on fiber and fiber Bragg gratings for WDM switching and gain equalization of erbium-doped fiber amplifiers", Proc. SPIE 4579, Optical Fiber and Planar Waveguide Technology, (19 October 2001); https://doi.org/10.1117/12.444877

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KEYWORDS

Cladding

Fiber Bragg gratings

Acoustics

Refractive index

Switching

Optical filters

Phase matching

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