Method and apparatus for locating discontinuities in optical transmission media

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	Method and apparatus for locating discontinuities in optical transmission media
其他题名	Method and apparatus for locating discontinuities in optical transmission media
	WONG, ROGER W.; VIFIAN, HUGO; HART, MICHAEL G.
	1989-07-26
专利权人	HEWLETT-PACKARD COMPANY
公开日期	1989-07-26
授权国家	欧洲专利局
专利类型	发明申请
摘要	A lightwave component measurement system incorporates a transform capability that converts data measured in the modulation frequency domain to the time or distance domain to locate discontinuities or terminations with high resolution. The system comprises a modulation source (20), an electrical power splitter (22), a lightwave source 14, an optical splitter/combiner (26), connected to a device under test (DUT) and a lightwave receiver (16), and a tuned vector receiver 24. The incident and reflected waves are added to give frequency-domain information, which is subjected to an inverse Fourier transform to calculate time-domain data. The system can measure the magnitude and distance to each discontinuity, as well as the length of an optical transmission medium, such as an optical fiber cable.
其他摘要	光波分量测量系统结合了变换能力，该变换能力将在调制频率域中测量的数据转换为时域或距离域，以定位具有高分辨率的不连续点或终端。该系统包括调制源（20），电功率分配器（22），光波源14，光分路器/组合器（26），连接到被测器件（DUT）和光波接收器（16），以及加入入射波和反射波以得到频域信息，对其进行逆傅里叶变换以计算时域数据。该系统可以测量到每个不连续点的大小和距离，以及光传输介质（例如光纤电缆）的长度。
主权项	A method for measuring optical reflections which allows the resolution of one or more relections due to corresponding discontinuities in a device under test, characterised in that it comprises the steps of: producing a modulated optical signal; producing incident and reflected modulated lightwaves, the reflected lightwave being produced by the optical signal being reflected as the optical signal encounters a discontinuity in the device under test (DUT); vectorially adding the incident and reflected lightwaves to form frequency-domain information comprising an amplitude varying ripple pattern versus the modulation frequency, the periodicity and amplitude of each of the ripple components containing distance and magnitude information of the discontinuity; and calculating time-domain data from the modulation frequency-domain information by performing an inverse Fourier transform on the frequency amplitude and phase information, the location of the discontinuity being revealed by a signature in the time-domain data.
申请日期	1989-01-18
专利号	EP0325435A2
专利状态	失效
申请号	EP1989300461
公开（公告）号	EP0325435A2
IPC 分类号	G01M11/00 \| G01B11/02
专利代理人	-
代理机构	WILLIAMS, JOHN FRANCIS
文献类型	专利
条目标识符	http://ir.opt.ac.cn/handle/181661/62424
专题	半导体激光器专利数据库
作者单位	HEWLETT-PACKARD COMPANY
推荐引用方式 GB/T 7714	WONG, ROGER W.,VIFIAN, HUGO,HART, MICHAEL G.. Method and apparatus for locating discontinuities in optical transmission media. EP0325435A2[P]. 1989-07-26.

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