13-03-2014 дата публикации
Номер: US20140071436A1
Принадлежит:
A polarization-related characteristic of an optical path is determined from a predetermined function of the mean-square of a plurality of differences between polarization-analyzed optical power parameters corresponding to pairs of wavelengths mutually spaced about a midpoint wavelength by a small optical frequency difference. At least some of the said differences correspond to wavelength pairs measured under conditions where at least one of midpoint wavelength, input state of polarization (I-SOP) or analyzed state of polarization (A-SOP) of a pair is different. 118. A method of measuring a polarization-related characteristic of an optical path () wherein light comprising polarized light is propagated , the method comprising the steps of using:{'b': 14', '20', '14', '14', '20', '14', '14', '20', '14', '20', '14', '20', '14', '45, 'polarization-controller-and-analyzer means (,A;A,B,;A,B,A; ,; ,C; A,) connected to the optical path at or adjacent either the proximal end thereof or a distal end thereof to control at least one of state of polarization (I-SOP) of light launched in the optical path and state of polarization (A-SOP) used to analyze light leaving the optical path,'}{'b': 22', '22', '22', '22, 'detecting means (; A,B; D) to detect the analyzed light and provide corresponding detection signals, and'}{'b': '40', 'processing means () to process the detection signals to derive said polarization-related characteristic,'}wherein said light leaving the optical path is analyzed to provide transmitted coherent optical power at each wavelength of light in each of at least two groups of wavelengths,{'sub': L', 'U, 'and wherein the lowermost (λ) and uppermost (λ) said wavelengths in each said group of wavelengths are separated by a first small optical frequency difference;'}and wherein each of the said at least two groups comprises a wavelength pair, said pair in each group defining a midpoint wavelength therebetween, and being mutually spaced by a second small optical- ...
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