Optics: measuring and testing – For optical fiber or waveguide inspection
Patent
1983-08-31
1985-12-03
McGraw, Vincent P.
Optics: measuring and testing
For optical fiber or waveguide inspection
G01N 2127
Patent
active
045563144
ABSTRACT:
The dispersion in an optical fiber is determined using an intensity or optical signal envelope cross-correlation. Light from an optical source is injected into two transmission paths in which the relative delay can be varied. At least one path comprises the optical fiber whose dispersion is to be determined. Each path provides an output signal having a signal envelope. These envelopes are then cross-correlated for a number of wavelengths to provide a measurement of group delay from which the dispersion is determined.
REFERENCES:
patent: 4411520 (1983-10-01), Mochizuki et al.
"Wavelength Dependence of Modal Dispersion in Graded Index Optical Fibers", Jeunhomme et al., Electronics Letters, 6-1978, pp. 364-366.
"Measuring Equipment for an Experimental Optical Fiber Transmission System", Kobayashi et al., Electrical Communication Liboratories, 6-1978, pp. 712-726.
IEEE J. Quant. Elect., QE-17, "Interferometric Method for Chromatic Dispersion Measurement in a Single-Mode Optical Fiber", Tateda et al., 1981.
Elect. Lett., 1981, 17 (7), "Chromatic Dispersion Measurement by White-Light Interferometry on Meter-Length Single-Mode Optical Fiber", Shang.
Pending application Cohen-Stone 9-15, Ser. No. 388,027, filed Jun. 14, 1982.
IEEE, vol. 68, No. 10, Oct. 1980, "Experimental Techniques for Evaluation of Fiber Transmission Loss & Dispersion"-Cohen et al.
Applied Physics Ltrs., vol. 27, No. 4, Aug. 1975, "Measurement of Very Short Optical Delays in Multimode Fibers"-Crosignani et al.
Optics Ltrs., vol. 3, No. 2, Aug. 1978, "Polarization Mode Dispersion in Single-Mode Fibers"-Rashleigh-Ulrich.
Applied Optics, vol. 19, "Spatial Technique for Measuring Modal Delay Differences in Dual-Mode Optical Fibers" May 1980-Shibata et al.
Electronics Ltrs., vol. 17, No. 14, Jul. 1981, "Interference Measurement of Dispersion of a Single-Mode Optical Fiber"--Bomberger et al.
AT&T Bell Laboratories
McGraw Vincent P.
Padnes David R.
Turner S. A.
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