Singlemode Optical Fiber G.652D

G.652.D Single-mode Low Water Peak Fiber

In fiberoptic communication, a singlemode optical fiber (SMF) is an optical fiber designed to carry only a single mode of light - the transverse mode. Modes are the possible solutions of the Helmholtz equation for waves, which is obtained by combining Maxwell's equations and the boundary conditions. These modes define the way the wave travels through space, i.e. how the wave is distributed in space. Waves can have the same mode but have different frequencies. This is the case in single-mode fibers, where we can have waves with different frequencies, but of the same mode, which means that they are distributed in space in the same way, and that gives us a single ray of light. Although the ray travels parallel to the length of the fiber, it is often called transverse mode since its electromagnetic oscillations occur perpendicular (transverse) to the length of the fiber. The standards G.652 and G.657 define the most widely used forms of single-mode optical fiber.

Unless specifically stated, it is commonly accepted among networking professionals that when requesting singlemode fibre cables they will conform to ITU-T G652.D. This standard is applicable to both singlemode OS1 and OS2 cables and describes the geometrical, mechanical and transmission attributes of the cable and ensures that the cable can be used in the operating wavelengths around 1310nm and 1550nm.

Note that G.652.D, G.657.A1 and G.657.A2 all have the same physical size with internal and external core diameters of 9μm and 125μm, respectively. This means that cables defined under all three standards are completely compatible with each other.

G.657.A1 vs G.657.A2

G.657.A2 is also compliant with G.652.D while having a tighter minimum bend radius of 7.5mm, compared to 10mm for G.657.A1.

Because of its tighter bend radius and compliance with G.652.D, G.657.A2 is popular for use in tighter spaces within high density patching fields in data centres. Many of our customers from larger telecommunication companies also ask for G.657.A2 for the same reason.

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