1. A.P. McDonna, D.J. McCartney, D.B. Mortimore, ’1.3 μm bidirectional optical transmission over 31 km of installed single-mode fibre using optical couplers,’ Electronics Letters, vol.20, no. 18, pp.722–723, 1984.
2. R.D. Hall, R.A. Betts, J.P. Moss, ’Bidirectional transmission over 11 km of single-mode optical fibre at 34 Mbit/s using 1.3 μm LEDs and directional couplers,’ Electronics Letters, vol.21, no. 14, pp.628–629, 1985.
3. R.J.S. Bates, J.D. Spalink, S.J. Butterfield, J. Lipson, CA. Burrus, T.P. Lee, R.A. Loogan, ’1.3 μm/1.5 μm bidirectional WDM opticalfibre transmission system experiment at 144 Mbit/s,’ Electronics Letters, vol.19, no. 13, pp.458–459, 1983.
4. M. Stern, J.L. Gimmlett, L. Curtis, N.K. Cheung, M.B. Romeiser, W.C. Young, ’Bidirectional LED transmission on single-mode fibre in the 1300 and 1500 nm wavelength regions,’ Electronics Letters, vol.21, no.20, pp.928–929, 1985.
5. K. Okada, N. Miki, ’Fiber-optic subscriber systems for point-to- multipoint transmission architecture,’ 18th European Conference on Optical Communication (ECOC’92), Berlin, 27 September-1 October 1992, paper WeA11.2, pp.573–576.