[1] Hill K O, Fuji Y, Johnson D C, et al. Photosensitivity in optical fiber waveguides: application to reflection filter fabrication. Appl Phys Lett, 1978, 32(6): 647～649

[2] Meltz G., Morey M M, Glenn W H. Formation of Bragg gratings in optical fibers by a transverse holographic method. Opt Lett, 1989, 14(15): 823～825

[4] Cruz J L, Diez A, Andres M V. Improved thermal sensitivity of fiber Bragg gratings using a polymer overlay. Electron Lett , 1996, 32(4): 385～387

[5] Kumazaki H, Yamada Y, Nakamura H, et al. Tunable wavelength filter using a Bragg grating fiber thinned by plasma etching. IEEE Photo Tech Lett , 2001, 13(4): 1206～1208

[6] Erdogan T. Fiber grating spectra. J Lightwave Technol, 1997, 15(8): 1277～1294