1. K. C. Kao and G. A. Hockham, “Dielectric-Fibre Surface Waveguides for Optical Frequencies,” Rroc. Inst. Elect. Eng. 113(7), 1151 (1966).
2. F. P. Kapron, D. B. Keck, and R. D. Maurer, “Radiation Losses in Glass Optical Waveguides,” Appl. Phys. Lett. 17, 423 (1970).
3. P. C. Schultz, “Making the First Low-Loss Optical Fibers,” Optics Photonics News, No. 30 (2010).
4. A. V. Belov, M. M. Bubnov, A. N. Gur’yanov, et al., “A Low-Loss Fiber Guide with a Quartz Glass Core and a Borosilicate Cladding,” Pis’ma Zh. Tekh. Fiz. 1(15), 689 (1975).
5. Zh. I. Alferov, M. I. Belovolov, A. T. Gorelenok, et al., “Fiber-Optical Long-Distance Communication Line Operating at the Wavelength of 1.3 μm,” Kvant. Elektron. 5, 2486 (1978) [Sov. J. Quantum Electron. 8 (11), 1403 (1978)].