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- Coupling loss, also known as connection loss, is the loss that occurs when energy is transferred from one circuit, circuit element, or medium to another. Coupling loss is usually expressed in the same units—such as watts or decibels—as in the originating circuit element or medium. Coupling loss in fiber optics refers to the power loss that occurs when coupling light from one optical device or medium to another. (See also Optical return loss.) Coupling losses can result from a number of factors. In electronics, impedance mismatch between coupled components results in a reflection of a portion of the energy at the interface. Likewise, in optical systems, where there is a change in index of refraction (most commonly at a fiber/air interface), a portion of the energy is reflected back into the source component. Another major source of optical coupling loss is geometrical. As an example, two fibers coupled end-to-end may not be precisely aligned, with the result that the two cores overlap somewhat. Light exiting the source fiber at a portion of its core that is not aligned with the core of the receiving fiber will not (in general) be coupled into the second fiber. While some such light will be coupled into the second fiber, it is not likely to be efficiently coupled, nor will it generally travel in an appropriate mode in the second fiber. Similarly, even for two perfectly aligned cores, where there is a gap of any significant distance between the two fibers, there will be some geometric loss due to spread of the beam. Some percentage of the light rays exiting the source fiber face will not intersect the second fiber within its entrance cone. (en)
- 耦合损耗（英語：coupling loss）指能量从一个电路或其中某个元件传播到另一个电路时发生的能量损耗。耦合损耗的单位为瓦特或分贝。 在光导纤维中，当耦合光从一种光学设备转换到另一种光学介质时，同样也会考虑耦合损耗。 耦合损耗源于多种不同的因素。在电子耦合中，参与耦合两部分阻抗的不匹配造成部分能量在界面处发生反射。同理，在光学系统里，如果折射率发生突变，能量也会被反射到能量来源的哪一端。 (zh)
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- 耦合损耗（英語：coupling loss）指能量从一个电路或其中某个元件传播到另一个电路时发生的能量损耗。耦合损耗的单位为瓦特或分贝。 在光导纤维中，当耦合光从一种光学设备转换到另一种光学介质时，同样也会考虑耦合损耗。 耦合损耗源于多种不同的因素。在电子耦合中，参与耦合两部分阻抗的不匹配造成部分能量在界面处发生反射。同理，在光学系统里，如果折射率发生突变，能量也会被反射到能量来源的哪一端。 (zh)
- Coupling loss, also known as connection loss, is the loss that occurs when energy is transferred from one circuit, circuit element, or medium to another. Coupling loss is usually expressed in the same units—such as watts or decibels—as in the originating circuit element or medium. Coupling loss in fiber optics refers to the power loss that occurs when coupling light from one optical device or medium to another. (See also Optical return loss.) (en)
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- Coupling loss (en)
- 耦合损耗 (zh)
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