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Force-induced long-period fiber gratings are formed in a graded-index two-mode fiber and a step-index two-mode fiber in series to build an all-fiber bandpass filter. The passband transmittance and bandwidth in… Click to show full abstract
Force-induced long-period fiber gratings are formed in a graded-index two-mode fiber and a step-index two-mode fiber in series to build an all-fiber bandpass filter. The passband transmittance and bandwidth in the filter response are refined by adjusting the orientation of the LP11 mode traveling through the in-line two-mode fibers. The filter passband singly appeared over 1450 to 1650 nm with a peak transmittance of −2.2 dB and a full-width half-maximum bandwidth of 17 nm. This device scheme can be applied for various fiber components, including all-fiber tunable fiber lasers, wavelength-selective filters, and fiber-optic sensors.
Journal Title: IEEE Photonics Technology Letters
Year Published: 2017
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