Json Reponse

Hi Guys !

I want to create a JSON response to request my DCA with JQuery.
I tried to create a module and everything works great except one thing : my result contain a ghost caracter (&#65279) at the begining so my Ajax request return an error because it's not a valid JSON respons. I encode my template with UTF-8 Without BOM but it does not change anything.
How can i correct that ? Or how to create a correct JSON response for my page.

Thanks in advance