Hi . Thank you for your reply.Sorry about my expression.
To make it clear, my aim is to design a ring network with amplifiers to identify optical power management issues.
In my design, eight channels run in the ring network and it is required to use multiplexer and demultiplexer.
In all,my design maybe wrong. It is required to use multiplexer and demultiplexer in a ring network.Also, it is required to identify power management issues which result from several factors,like wavelength dependent loss in fiber;wavelength dependent gain in amplifiers;channel to channel insertion loss variation in multiplexer and demultiplexer.What the design should be like to realize this function?Please help.