what is an OS1
Thus OS1 is a general term used to specify Single mode optical fibers that comes under the heading of ITU-T G.652. OS2 was introduced in the year 2006. OS2 fibers are very clearly the low water peak fibers. Single mode fibers categorized in ITU-T as G.652C and G.652D comes under OS2 fibers.se of common terminology that will be helpful to everybody involved in fiber optic technology is a must especially for fiber optic engineers and technicians. There are two recent entries in Fiber optic terminology. The first one is OS1 and the second one is OS2.