The 25-year-old joined The Railwaymen from Kidderminster Harriers for a fee of £100,000 - a record for the non league side.
Bignot is a speedy full-back, but he lost his way at Crewe after suffering a shocking loss of form. He has represented England at semi-professional level and is well known for his competitiveness.
Having signed a two-year deal at Rovers, Bignot will be looking to get his career back on track.