Czapla, A., Bock, W. J. and Woliński, T. R. (2009) “High-Efficiency Thermal Tuning of a Long-Period Fiber Grating Using a Liquid Crystal Layer”, Photonics Letters of Poland, 1(2), pp. pp. 100–102. doi: 10.4302/photon. lett. pl.v1i2.43.