tailieunhanh - Optical Networks: A Practical Perspective - Part 85

Optical Networks: A Practical Perspective - Part 85. This book describes a revolution within a revolution, the opening up of the capacity of the now-familiar optical fiber to carry more messages, handle a wider variety of transmission types, and provide improved reliabilities and ease of use. In many places where fiber has been installed simply as a better form of copper, even the gigabit capacities that result have not proved adequate to keep up with the demand. The inborn human voracity for more and more bandwidth, plus the growing realization that there are other flexibilities to be had by imaginative use of the fiber, have led people. | 810 Index large effective area fiber LEAF 94-95 choosing 342 dispersion profile 94 distribution of power 95 96 refractive index profile 95 See also optical fiber s large electronic switches 215-216 large optical switches 201-207 224 blocking characteristics 202-203 build considerations 201-203 loss uniformity 202 number of crossovers 202 number of switch elements 202 See also optical switches LARNET WRPON 607-608 laser arrays 185-186 lasers 166-176 coherent output 168 distributed-feedback DFB 37 169-171 edge-emitting 173 external cavity 171-172 Fabry-Perot FP 168 186 fiber 166 grating coupler sampled reflector GCSR 183 185 186 local-oscillator 263 longitudinal modes 168-169 mode-locked 174-176 multiple-longitudinal mode MLM 168 169 principle of operation 167-168 sampled grating SG DBR 183 184-185 semiconductor 166 526 single-longitudinal mode SLM 37 168 169 super-structure grating SSG DBR 183 184-185 tunable 178-186 vertical cavity surface-emitting 173-174 VGF 183-184 lasing loops 298-299 effects 298 handling methods 298 lasing threshold 168 latching switches 201 layered network architecture 16-20 classical 18-19 data flow between layers 17 data link layer 18-19 hierarchy illustration 17 IP over ATM over SONET network 20 IP over SONET network 19-20 multiplexing example 23 network layer 19 physical layer 18 SONET layer 22 23 transport layer 19 See also optical layer L-band 316 C-band vs. 689 EDFAs 158-159 289 positive chromatic dispersion fibers and 97 See also C-band Lead service class 567 light-emitting diodes LEDs 176-178 light output 177 slicing 177-178 lightpaths 15 403 504 average lease time 466 bandwidths 502 circuit-switched 428 dedicated 447 full-duplex 485 optical layer 21 permanent 21 protecting 420 428-429 protection routes per 580 sets of 475 setting up taking down 403 single-hop 443 undirected 455 lightpath topologies 405-406 440 442-443 all-optical 442 445-446 congestion vs. node degree 454 designing 449 453 hub design 442 444-445 PWDM ring 442 443 .