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However, there are also extra costs from the amplifiers and the larger splitters. The choice which option will be the most feasible is a technoeconomical choice. 24 2. Network aspects a) -------------------, LocaL exchange b) r----------------, LocaL exchange I c) r----------------, LocaL exchange Fig. 7 Bidirectional communication. a) Star-tree: 100 channels for 1000 subscribers. b) Tree-tree: ten times 10 channels for 100 subscribers. c) Tree-tree plus bidirectional optical amplifier: three times 30 channels for 300 subscribers.

48 2. 0 Frequency IGHz) Fig. 26 IF spectrum of the coherent distribution system: a) unmodulated and free running, b) unmodulated and AFC locked, c) FSK modulated signal. 57J, courtesy ECOC). Bidirectional communicative transmission For the bidirectional channels a "tandem locking scheme" is applied. The subscriber LO laser is locked relative to the incoming signal using an AFC signal extracted from the demodulator, at an IF of 600 MHz. 4 GHz. For this purpose 10% of both LO and TX output are mixed on a single photo detector.

2. 12] A. Sp1ett, C. Kurtzke, K. 41-44. 13] K. -E. -P. 1821-1830, 1988. 14] J-M. Gagne, E. David, L. 3, no. 10261028, 1991. W. G. 455-457, 1989. 16] N. Shimosaka, K. Kaede, M. Fujiwara, S. Yamazaki, S. Murata, M. 1078-1086, 1990. 17] Q. Z. 1626-1628, 1989. c. J. J. Fitzgerald, B. W. R. 1313-1314, 1988. 19] P-Y. Chien, C-L. 83, no. 81-84, 1991. 20] H. Toba, K. Inoue, K. Nosu, G. 50-54, 1988. W. R. Barry, T. E. 5 /-tm regoin,' Electronics Letters, vol. 25, no. 1, pp. 9-11, 1989. 54 2. 22] P. Gambini, M.

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Science and Technology Review August 1995 by The Lawrence Livermore National Laboratory

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