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CHAPTER Challenges for Long-haul and Ultra-long-haul Dynamic Networks 10 Martin Birk, Kathy Tse AT&T Labs., USA CHAPTER OUTLINE HEAD 10.1. Photonic network evolution ........................................................................ 10.1.1. Data rate evolution ................................................................. 10.1.2. WDM evolution ...................................................................... 10.1.3. Network architecture evolution ................................................ 10.1.4. Amplifier evolution ................................................................. 10.1.5. Status quo............................................................................. 10.2. Requirements for amplifiers in today's photonic mesh networks ................... 277 278 278 279 283 285 285