DWDM and EDFA and DCM

Does anyone have some experience to use dwdm monofiber mux/demux ( ex. fiberstore ) about 68km using a ADFA ? Have I to use a DCM( for chromatic dispersion ) on this distance? When I have to use a DCM ? Rodrigo Augusto Gestor de T.I. Grupo Connectoway http://www.connectoway.com.br <http://www.connectoway.com.br/> http://www.1telecom.com.br <http://www.1telecom.com.br/> * rodrigo@connectoway.com.br <mailto:rodrigo@connectoway.com.br> ( (81) 3497-6060 ( (81) 8184-3646 ( INOC-DBA 52965*100