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By Stanford Linear Accelerator Center.; United States. Department of Energy

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However, polyimide coatings are much more difficult to remove, and are generally only found on certain specialty fibers. Some large diameter (200 µm or more) multimode silica fibers are coated with a hard, low refractive index polymer, which can serve as both a coating and an optical cladding. The coatings of these hard clad silica fibers, commercially known as HCST M or TECST M , improves fiber strength and abrasion resistance so these fibers can often be cabled without Kevlar yarn. Moreover, connectors can usually be mechanically attached directly to the hard coating, facilitating connectorization.

1 Stripping The fundamental motivation for stripping the coating from a fiber prior to fusion splicing is that the high temperatures experienced during joint formation will damage polymer coatings and possibly damage the heated portion of glass contacting the coating. Furthermore, alignment of the fiber is more 28 2. Fiber Preparation accurate when gripping on the bare glass surface because the dimensional tolerances of the glass are usually far superior to that of the polymer coating. Finally, optical fiber coatings often exhibit shape memory, known as curl, which can complicate fiber alignment (see Sect.

The effect of fusion splices on multimode optical fiber communication systems can be particularly confusing. In contrast to the behavior of single-mode fiber splice, the loss of a multimode fiber splice can depend on its proximity to other splices. This is because a splice can scramble the distribution of optical power amongst the various modes, and splice loss partly depends on this power distribution. 23]. Multimode and single-mode fusion splice loss, as well as modal noise and MPI, are discussed in more detail in Chap.

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