Authorities consider Cuba's small community of outspoken dissidents to be traitorous counterrevolutionaries who accept foreign money to try to undermine the Communist system. They deny holding any political prisoners.
In recent years Cuba cleared its lockups of internationally recognized prisoners of conscience, with the last of 75 dissidents jailed in a 2003 crackdown walking free in 2011 thanks to a deal brokered by the Roman Catholic Church.
Many went into exile with their families, although others remained in Cuba.
Amnesty recognized five other Cuban "prisoners of conscience" last month.
But for the most part, activists say brief catch-and-release detentions have replaced long jail terms as a strategy for keeping dissent in check.
Elizardo Sanchez, who heads a Cuba-based non-governmental group that monitors opposition arrests, said there was no proof Fernandez had committed any crime, and expressed surprise at the sentence.
"We support Amnesty International's petition," Sanchez said.
Fernandez is not a well-known dissident, and Sanchez said he does not have a long history as an activist.
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Andrea Rodriguez on Twitter: www.twitter.com/ARodriguezAP