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1) When something is sold should not lead to the direct conclusion that it is good.
2) Yes Lucent spent a lot of time publishing papers on nonlinear effects of pre-comp. In the special circumstances they were investigating they were right. If a carrier deploys in other circumstances, it could work well for them.
3) The subject of the thread is "DPQPSK to be de facto?" and the answer is clearly no because:
a) DPSK and ODB have the market lead.
b) There are many more companies that can do DPSK than companies that can do DPQPSK, which might lead to lower cost because of competition.
c) Nonlinear effects are very detrimental and performance CANNOT match DPSK by merely reducing input power, this was demonstrated by several authors, not just the New Jersey guys. For some distances, DPQPSK just won't work. At shorter distances it is great, but you are probably paying for "great" when you only need "good".