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Wavelength-selective all-fiber filter based on a single long-period fiber grating and a misaligned splicing point |
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| Authors: | Xinyong Dong Lei Su Y Chung |
| Institution: | a Network Technology Research Centre (NTRC), School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Drive, RTP, 4th Storey, Slab Block, Singapore 637553, Singapore b Department of Information and Communications, Gwangju Institute of Science and Technology, Gwangju 500-712, Korea c School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798, Singapore |
| Abstract: | A novel wavelength-selective all-fiber filter using a single long-period fiber grating (LPG) interacting with a misaligned fusion splicing point has been demonstrated. The misaligned splicing point couples a part of the core mode power into the cladding modes, which is then recoupled into the core mode by the following LPG. As an optical path difference is introduced by the differential refractive index of the fiber, an in-fiber Mach-Zehnder interferometer is therefore formed, which may function as a cost-efficient WDM filter with good isolation and low insertion loss. |
| Keywords: | Optical fiber communication Long-period fiber gratings Optical fiber filters Mach-Zednder interferometers |
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