1. J. Azana, M. Kulishov, All-fibre ultrafast optical differentiator based on π-phase-shifted long-period grating. Electron. Lett. 41, 1368–1369 (2005)
2. R.A. Bergh, H.C. Lefevre, H.J. Shaw, Single-mode fiber optic polarizer. Opt. Lett. 5, 479–481 (1980)
3. V. Bhatia, Applications of long-period gratings to single and multi-parameter sensing. Opt. Express 4, 457–466 (1999)
4. V. Bhatia, A. Vengsarkar, Optical fiber long-period grating sensors. Opt. Lett. 21, 692–694 (1996)
5. M. Bibra, A. Roberts, Long period fibre gratings made with focused ion beam irradiation, in The 14th International Conference on Optical Fiber Sensors, (2000), pp. 604–607