De-embedment of optical component characteristics and calibration of optical receivers using rayleigh backscatter
First Claim
1. A method of de-embedding optical component characteristics from optical device measurements using Rayleigh backscatter (RIBS), comprising:
- sweeping an optical signal at a predefined sweep rate over a predefined wavelength range;
detecting the RBS on both sides of an optical component;
obtaining a frequency domain average or a frequency domain least square fit for the RBS on both sides of the optical component;
determining an optical component characteristic from the frequency domain average or the frequency domain least square fit; and
de-embedding the optical component characteristic from the optical device measurements.
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Abstract
Method and system are disclosed for de-embedding optical component characteristics from optical device measurements. In particular, the invention uses frequency domain averaging of the RBS on both sides of an optical component to determine one or more of its optical characteristics. Where the RBS has a slope (e.g., as in the case of a lossy fiber), a frequency domain least square fit can be used to determine the optical component characteristics. In addition, the invention uses a reference DUT to correct for variations in the frequency response of the photoreceiver. A reference interferometer is used in the invention to correct for sweep non-linearity of the TLS. The optical component characteristics are then de-embedded from optical device measurements to provide a more precise analysis of the optical device.
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Citations
40 Claims
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1. A method of de-embedding optical component characteristics from optical device measurements using Rayleigh backscatter (RIBS), comprising:
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sweeping an optical signal at a predefined sweep rate over a predefined wavelength range;
detecting the RBS on both sides of an optical component;
obtaining a frequency domain average or a frequency domain least square fit for the RBS on both sides of the optical component;
determining an optical component characteristic from the frequency domain average or the frequency domain least square fit; and
de-embedding the optical component characteristic from the optical device measurements. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An optical device analyzer for use with an interferometer and a photoreceiver, the intefferometer receiving an optical signal at a predefined sweep rate over a predefined wavelength range from an optical source, and the photoreceiver detecting RBS in a composite signal from the interferometer, comprising;
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a signal processing unit configured to capture RBS on both sides of an optical component from the photoreceiver and to transform the RBS from the time domain to the frequency domain; and
a data processing module configured to determine a frequency domain average for the RBS or a frequency domain least square fit for the RBS. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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31. A method of de-embedding optical component characteristics from optical device measurements using Rayleigh backscatter (RBS), comprising:
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sweeping an optical signal at a predefined sweep rate over a predefined wavelength range;
detecting the RBS on both sides of an optical component using an interferometric analyzer;
adjusting a wavelength range of the optical signal to increase a spatial resolution of the analyzer;
obtaining a frequency domain average or a frequency domain least square fit for the RBS on both sides of the optical component;
determining an optical component characteristic from the frequency domain average or the frequency domain least square fit; and
de-embedding the optical component characteristic from the optical device measurements.
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Specification