Deployment of optical fiber cable in limited space and in tight bend conditions demands reduced diameter optical fiber and cable with bend insensitive fiber. To address this need, optical fiber with 200 micron outer coating diameter instead of 250 micron for conventional fiber has been developed. This white paper outlines various advantages of 200 micron fiber and its backward compatibility with conventional fiber. Optical fiber is used in all modern optical communications including long-haul, regional, access, and FTTX networks. An optical fiber is made up of three layers, namely, core, cladding, and coating. Light is guided down the center of the fiber called the "core". The core is surrounded by an optical material called the "cladding" that contains the light in the core using an optical phenomenon called "total internal reflection." The fiber is coated by a buffer layer that protects it from moisture and physical damage. The buffer or “coating”is what one strips off the fiber for termination or splicing. More protection is provided by the cable which has the fibers and strength members inside an outer protective covering called a "jacket" or a "sheath."