He arrived here by a private carrier flight, nearly three weeks after his release from the prison.
When asked by reporters at the airport whether he will pen a book on his prison experience, Karnan said he will consider it.
He became the first sitting high court judge to have been sentenced to a prison term.
Karnan, who had enrolled himself as an advocate with the Bar Council of Tamil Nadu in 1983, was appointed a judge of the Madras High Court in 2009. He was transferred to the Calcutta High Court on March 11, 2016.
He was transferred from the Madras High Court for his repeated allegations against and run-ins with the then chief justice and fellow judges of the court.
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