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A novel Optical Fabry-Perot Interferometer (FPI) which consists of a couple of GRIN lenses is presented. The GRIN lenses are used not only as a collimating lens and a focus lens respectively, but also as a Fabry-Perot resonator which is piezoelectrically tuned. Compared with other types of FPI for optical filter this device has a much simple structure, lower insertion loss. It is compatible with fibers and useful for different WDM's wavelength spans.
Zhongxian Zhang
"A novel inline tunable Fabry-Perot filter for WDM fiber systems", Proc. SPIE 1230, International Conference on Optoelectronic Science and Engineering '90, 123056 (1 July 1990); https://doi.org/10.1117/12.2294823
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Zhongxian Zhang, "A novel inline tunable Fabry-Perot filter for WDM fiber systems," Proc. SPIE 1230, International Conference on Optoelectronic Science and Engineering '90, 123056 (1 July 1990); https://doi.org/10.1117/12.2294823