Education could range upon Bachelor's Degrees or even PhD's, depending on how advance the position you are aiming for. Also must have a School Diploma.
You must have knowledge like CADD, CAM to operate systems. Mechanical engineering, engineering science, electrical engineering degrees are required as well.
Photonic Engineer like other Engineers needs to look professionally. There is no need for flashy outfits but you shouldn't wear a casual shirt like a T-Shirt to work.
A polo and a good set up pants to work efficently but also looking professionally.