Is LN channel bidirectional?
Yes, all Lightning Network channels are bidirectional. There is no reason to artificially change that. Consider reading my "
Basics of The Lightning Network" thread if you are still confused. I also updated
the FAQ yesterday. You might find these two threads useful.
2) May Bob and Alice open just 1 channel where both fund 1 BTC so the total balance of the channel will be 2 BTC or the only possible way is that Bob opens channel with Alice where he funds 1 BTC so the total balance will be 1BTC and Alice has to opend channel with Bob, where she fund 1 BTC?
Currently, it is not possible for two people to provide funds for the same channel. Theoretically, Bob could open a channel with 2 BTC and push 1 BTC to the Alice's side.