IEC 60793-1-49-2006
光学纤维.第1-49部分:测量方法和试验程序.差分模延迟

Optical fibres - Part 1-49: Measurement methods and test procedures - Differential mode delay

IEC 60793-1-49-2006 发布历史

This part of IEC 60793 applies only to multimode, graded-index glass-core (category A1) fibres. The test method is commonly used in production and research facilities, but is not easily accomplished in the field. This standard describes a method for characterizing the modal structure of a graded-index multimode fibre. This information is useful for assessing the bandwidth performance of a fibre especially when the fibre is intended to support a variety of launch conditions such as those produced by standardized laser transmitters. With this method, the output from a fibre that is single-mode at the test wavelength excites the multimode fibre under test. The probe spot is scanned across the endface of the fibre under test, and the optical pulse delay is determined at specified offset positions. Two results can be produced from the same data. First, the difference in optical pulse delay time between the fastest and slowest mode groups of the fibre under test can be determined. The user specifies the upper and lower limits of radial offset positions over which the probe fibre is scanned in order to specify desired limits of modal structure. The DMD data is then compared to DMD specifications that have been determined by modeling and experimentation to correspond to a minimum EMB for a range of transmitters. Second, the optical pulse shapes can be combined using specific weights to determine a calculated effective modal bandwidth (EMBc), and by calculating a sequence of EMBc values with different sets of weights, a minimum EMBc can be calculated, corresponding to a range of transmitters. The test quantifies the effects of interactions of the fibre modal structure and the source modal characteristics excluding the source spectral interactions with fibre chromatic dispersion. Adding the effects of chromatic dispersion and source spectral width will reduce the overall transmission bandwidth, but this is a separate calculation in most transmission models. In this test, the effects of non-zero spectral width are minimized but any residual effects will tend to increase the DMD value and decrease the EMBc value.

IEC 60793-1-49-2006由国际电工委员会 IX-IEC 发布于 2006-06。

IEC 60793-1-49-2006 在中国标准分类中归属于: M33 光通信设备，在国际标准分类中归属于: 33.180.10 光纤和光缆。

IEC 60793-1-49-2006的历代版本如下：

• 2003年03月 IEC 60793-1-49-2003 光学纤维.第1-49部分:测量方法和试验程序.差分模延迟
• 2006年06月 IEC 60793-1-49-2006 光学纤维.第1-49部分:测量方法和试验程序.差分模延迟
• 2018年08月15日 IEC 60793-1-49-2018 光纤 - 第1-49部分:测量方法和测试程序 - 差分模式延迟

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标准号

IEC 60793-1-49-2006

发布日期

2006年06月

实施日期

废止日期

无

中国标准分类号

M33

国际标准分类号

33.180.10

发布单位

IX-IEC

代替标准

IEC 60793-1-49-2018

被代替标准

IEC 86A/1061/FDIS-2006 IEC 60793-1-49-2003 IEC 60793-1-49 Corrigendum 1-2005

适用范围

This part of IEC 60793 applies only to multimode, graded-index glass-core (category A1) fibres. The test method is commonly used in production and research facilities, but is not easily accomplished in the field. This standard describes a method for characterizing the modal structure of a graded-index multimode fibre. This information is useful for assessing the bandwidth performance of a fibre especially when the fibre is intended to support a variety of launch conditions such as those produced by standardized laser transmitters. With this method, the output from a fibre that is single-mode at the test wavelength excites the multimode fibre under test. The probe spot is scanned across the endface of the fibre under test, and the optical pulse delay is determined at specified offset positions. Two results can be produced from the same data. First, the difference in optical pulse delay time between the fastest and slowest mode groups of the fibre under test can be determined. The user specifies the upper and lower limits of radial offset positions over which the probe fibre is scanned in order to specify desired limits of modal structure. The DMD data is then compared to DMD specifications that have been determined by modeling and experimentation to correspond to a minimum EMB for a range of transmitters. Second, the optical pulse shapes can be combined using specific weights to determine a calculated effective modal bandwidth (EMBc), and by calculating a sequence of EMBc values with different sets of weights, a minimum EMBc can be calculated, corresponding to a range of transmitters. The test quantifies the effects of interactions of the fibre modal structure and the source modal characteristics excluding the source spectral interactions with fibre chromatic dispersion. Adding the effects of chromatic dispersion and source spectral width will reduce the overall transmission bandwidth, but this is a separate calculation in most transmission models. In this test, the effects of non-zero spectral width are minimized but any residual effects will tend to increase the DMD value and decrease the EMBc value.

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