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	Measurement of attenuation of optical fibers using bidirectional transmission of information via the fiber
	LAMONDE JOSEPH EMILIEN GERMAIN; LAFLAMME JEAN; CYR MICHEL
	1997-12-16
著作权人	EXFO ELECTRO-OPTICAL ENGINEERING INC.
专利号	CA2121429C
国家	加拿大
文献子类	授权发明
其他题名	Measurement of attenuation of optical fibers using bidirectional transmission of information via the fiber
英文摘要	Attenuation of an optical fiber is measured by transmitting an optical signal having a predetermined wavelength to the fiber, and FSK modulating the optical signal with information identifying the wavelength and transmitted power of the optical signal. At a receiver, the optical signal is detected and the information is recovered by demodulation. Wavelength-dependent sensitivity information for the detector is read from a store in dependence upon the wavelength information and used to control the gain of an amplifier for amplifying a subsequently transmitted continuous wave optical signal used for attenuation measurement. The received power level of this optical signal is converted into a digital value and used with the transmitted power information to determine the fiber attenuation at the predetermined wavelength. Reference power levels are determined by connecting a jumper between a port and an external detector. Measurement of attenuation and communication data over the fiber under test may be effected using two transceiver units, one at each end of the fiber. In addition to the external detector, each unit has an internal detector and sources connected to a port which is connected to the fiber under test by a jumper. Determination of the attenuation of the fiber then takes account of the loss of each fiber using reference power levels determined by initial calibration measurements.
公开日期	1995-10-16
申请日期	1994-04-15
状态	失效
内容类型	专利
源URL	[http://ir.opt.ac.cn/handle/181661/34437]
专题	半导体激光器专利数据库
作者单位	EXFO ELECTRO-OPTICAL ENGINEERING INC.
推荐引用方式 GB/T 7714	LAMONDE JOSEPH EMILIEN GERMAIN,LAFLAMME JEAN,CYR MICHEL. Measurement of attenuation of optical fibers using bidirectional transmission of information via the fiber. CA2121429C. 1997-12-16.

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