[ns] optical link in Ns2

[Lion Bedroo]

Hi all,
It was written in some Ns2 materials that there is an optilink object which could be useful to make an optical link between two nodes in the Ns2 simulator but unfortunately I didn't found it in any places of the Ns2 files that I have.
Does anybody have tried to make an optical link using this simulator? would be very useful if some basic ideas given to start with them! 

Thanks in anticipates
Lion