| 单词 | IOR (Index Of Refraction) |
| 释义 | IOR (Index Of Refraction) It is extremely important to know the IOR of a given cable in order to calculate latency, i.e., the delay imposed on the signal, from end-to-end, by the medium. Latency has significant impact on the synchronization of transmitters, repeaters, multiplexers, and other active devices in a digital transmission system, and particularly in a high speed system such as a FOTS that runs at signaling speeds up to 40 Gbps. The IOR also has considerable impact on the physical construction of a glass optical fiber, which consists of an inner core surrounded by one or more layers of cladding.The optical signal is intended to travel through the inner core, and the cladding serves in various ways to ensure that happens. Step-index fiber is characterized by a sharp decrease in the IOR between the core and cladding, i.e., the cladding is sharply lower in IOR than the core material. This sharp step of approximately one percent in IOR at the core/cladding interface causes any errant light rays to reflect back into the core in a phenomenon known as total internal reflection. Graded-index fiber is characterized by a gradual decrease in the refractive index of the cladding through a great many layers of glass.The approach causes the errant light rays to gradually gain in velocity and bend back towards the core. Step-index construction is used largely in single-mode fiber (SMF) and graded-index in multimode fiber (MMF). See also core, cladding, graded-index fiber, latency, MMF, SMF, step-index fiber, and Vp. |
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