I finished my Masters in Computer Science at a decently reputed university in the United States. I was (and still am) excited about doing research and I applied to the Ph.D. program at the same university. I was accepted and I started the program this Fall.
Because of my experience in the department, I could start working in a lab from my first day in the Ph.D. program. I'm currently working on a topic that is closely related to my Master's thesis topic. But now I feel that I should explore other areas before committing on a Ph.D. topic.
I've been working on Operating Systems for as long as I remember, but recently, I attended a couple of seminars on NLP and Bio-informatics that got me excited. I don't have any background in either topics. But this makes me think that I should take a semester to explore other areas of research in Computer Science.
How should I go about this?
Update - I told my advisor. He said I should devote 100% of my time on his project. I fired him.