Ravi was convicted of bias intimidation last week and was sentenced to 30 days in jail. He will begin to serve his sentence on Thursday.
The former student was convicted for his role in harassing Tyler Clementi, who committed suicide after Ravi used a webcam to spy on him.
Dharun Ravi committed 'reprehensible' acts in setting up a webcam to spy on his Rutgers roommate's gay relationship, but they did not reach the level of a hate crime, the judge said.
Gay-rights activists in New Jersey said they would file a lawsuit following the defeat of the gay-marriage bill in the state Senate Thursday. But the effort to legalize gay marriage through the courts carries its own risks.