Hi,
The best thing that u can do in my opinion as you are a designer, to get a job and sign contracts with a another companies to do the construction with specific agreements. by this, u can minimize the liabilities as much as possible. and u can determine the profit. You know these ideas are...
hi;
http://electronics.howstuffworks.com/fiber-optic.htm , i hope u may find what u are looking for u, i have a full reseach about this subject but i'm aboard and so busy.