By The Lawrence Livermore National Laboratory
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Extra info for Science and Technology Review August 1995
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.
Science and Technology Review August 1995 by The Lawrence Livermore National Laboratory