Alan Gross faces up to 20 years in prison if convicted on a charge of violating the “integrity and independence of Cuba.”
Both sides delivered closing arguments before a panel of judges in Havana Saturday, at the end of the two-day trial.
Under Cuban law, judges can give verdicts immediately following the presentation of evidence.
Gross was arrested in Cuba in December 2009. He is accused of distributing Internet equipment and satellite phones to Cuban dissident groups.
The company Gross was working for denies the charge, and says Gross was trying to provide Internet service to members of Cuba's small Jewish population.
Gross's wife and U.S. officials were present in the court. However, the trial is closed to the media. Gross's American lawyer said the contractor and his Cuban attorneys presented a vigorous defense during the first day of the hearing Friday, and urged Cuba to release the ailing 61-year-old on humanitarian grounds.
U.S. Secretary of State Hillary Friday appealed to Cuba to release Gross “unconditionally” and allow him to return to his family.
Gross was working for a private firm, Development Alternatives International, contracted by the U.S. Agency for International Development, when he was arrested. The firm has since ceased its activities in Cuba.
The United States has repeatedly called for his release and says he was not doing anything illegal.