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5 November 2020 Detection of Bragg wavelength shift with high resolution based on an Erbium-doped fiber Bragg grating
Li Kai, Junqiang Sun
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Proceedings Volume 11569, AOPC 2020: Optical Information and Network; 115690D (2020) https://doi.org/10.1117/12.2579975
Event: Applied Optics and Photonics China (AOPC 2020), 2020, Beijing, China
Abstract
We analyze theoretically and verify experimentally a low-cost and effective scheme to realize detection of Bragg wavelength shift with high resolution based on an Erbium-doped fiber Bragg grating. The phase-shifted fiber Bragg grating is used in our experiments in order to achieve tunable single sideband modulation. Through the combination of the microwave domain and the optical domain, the Bragg wavelength shift of the grating induced by the 980-nm pump laser is translated to the amplitude variation of the beat signal generated in the photodetector. The experimental results indicate that 0.008 nm-wavelength shift is detected, which breaks out the resolution of commercial optical spectrum analyzer. Moreover, this resolution can be further improved by employing more accurate temperature and environment controlling systems. Compared with traditional optical domain detecting methods, the proposed approach shows obvious advantages in high resolution and convenient operation.
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Li Kai and Junqiang Sun "Detection of Bragg wavelength shift with high resolution based on an Erbium-doped fiber Bragg grating", Proc. SPIE 11569, AOPC 2020: Optical Information and Network, 115690D (5 November 2020); https://doi.org/10.1117/12.2579975
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KEYWORDS
Modulation
Fiber Bragg gratings
Single sideband modulation
Refractive index
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