WORCESTER — A former Rutland police officer serving 28 years in jail on two rape convictions has been denied a bid for a retrial he requested in November. Jason D. Briddon, who was 40 when sentenced on the second of two rape convictions in 2012, would not have prevailed had his wife been asked to testify as an alibi, a judge ruled, because she would not have testified on account of perjury concerns. It took two trials for a jury to convict Briddon in his second rape case, which centered on allegations Briddon raped a woman he met at a bar in 2007. Briddon’s wife had testified as his alibi in the first trial — that ended in mistrial — but by the second trial, the two were in a contentious divorce, and Briddon’s lawyer, David R. Yannetti, elected not to call her.