Effect of the cladding-mode coupling losses on the spectrum of a multi-channel fiber Bragg grating

Hongpu Li; Yuusaka Nakamura; Kazuhiko Ogusu; Yunlong Sheng

doi:10.1117/12.667082

28 January 2006 Effect of the cladding-mode coupling losses on the spectrum of a multi-channel fiber Bragg grating

Hongpu Li, Yuusaka Nakamura, Kazuhiko Ogusu, Yunlong Sheng

Proceedings Volume 6025, ICO20: Optical Communication; 60251V (2006) https://doi.org/10.1117/12.667082
Event: ICO20:Optical Devices and Instruments, 2005, Changchun, China

Abstract

Effect of the cladding-mode coupling losses on the spectrum of multi-channel fiber Bragg grating (FBG) has been numerically investigated on the basis of the extended coupled-mode equations. It has been shown that there exists a reflection slope in the spectrum of both the intra- and inter-channels due to the existences of the cladding-modes. This slope could be larger than 1 dB when the induced index change is about 3x10^-3, which makes the channels especially the one at the shortest wavelength considerably asymmetric. For comparison, a 39-channel linearly chirped FBG with a channel spacing of 0.8 nm and a chromatic dispersion of -850 ps/nm has been designed and fabricated. The experimental results show good agreement with the numerical ones.

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Hongpu Li, Yuusaka Nakamura, Kazuhiko Ogusu, and Yunlong Sheng "Effect of the cladding-mode coupling losses on the spectrum of a multi-channel fiber Bragg grating", Proc. SPIE 6025, ICO20: Optical Communication, 60251V (28 January 2006); https://doi.org/10.1117/12.667082

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KEYWORDS

Fiber Bragg gratings

Apodization

Cladding

Dispersion

Dense wavelength division multiplexing

Picosecond phenomena

Laser optics

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