I really dont know I am also interested in that but my question is is there any ad network having pay rates like google adsense which pay us via bitcoins?I will open my own company so I need to know that.
The answer is simple: there is no advertising network that will pay like Adsense (not even close)
There are a few good advertising networks (bitcoin related):
https://bitvertise.net,
http://mellowads.com/,
https://bitmedia.io/, but as I told you: do not expect to get the same rates as you can get from Adsense.
That is correct. Many people already answered this question above. No company is paying like Google Adsense. They are the best, and that's why every publisher want to join that network. But if your trying to open a new company then it's hard to attract customers with that high pay rates because AdSense have a bidding system for each keyword and people will go against those keywords and end up paying such a high price because they know that they will get a quality buyers from their system.