EP0269448A2
Expired / Lapsed
EP
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Optical time domain reflectometer
Assignee: HP Inc
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Filing: 1987-11-26
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Granted: —
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Expires: 2007-11-26
Abstract
Abstract An optical time domain reflectometer that injects at least two complementary code sequences into an optical fiber (26) and detects the return signal produced by each of these code sequences. These return signals are processed to extract the function h k that is equal to the response function for the fiber when a single pulse is injected into the fiber. This processing utilizes a correlation scheme that has no sidelobe distortion. Various combinations of Golay codes are suitable for use as the complementary codes.
Inventors
- 👤 William Richard Trutna, Jr.
- 👤 Moshe Nazarathy
- 👤 Steven Arthur Newton
- 👤 Scott Haines Foster
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-10 02:26
CPC Classifications
G; G01; G01M; G01M11/00; G01M11/30; G01M11/31; G01M11/3109; G01M11/3118
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
115 words
A tester comprising: a word generator (71) for generating complementary code sequences r m k ; means (22-24) responsive to the word generator, for injecting said complementary code sequence into a device under test; means (24,27-29) for detecting a return signal x m k produced by said device under test in response to r m k for each value of m = 1, ....,n for some integer n>1; and means (210,72) for processing the x m k to produce an output signal O k , said means for processing including means (72) for correlating linear combinations of the x m k with correlation functions C p k for p = 1,....,q for some integer q>1.
Claim 2
Dependent Claim
115 words
A tester comprising: a word generator (71) for generating complementary code sequences r m k ; means (22-24) responsive to the word generator, for injecting said complementary code sequence into a device under test; means (24,27-29) for detecting a return signal x m k produced by said device under test in response to r m k for each value of m = 1, ....,n for some integer n>1; and means (210,72) for processing the x m k to produce an output signal O k , said means for processing including means (72) for correlating linear combinations of the x m k with correlation functions C p k for p = 1,....,q for some integer q>1.
Claim 3
Dependent Claim
31 words
A tester as in claim 1 wherein the r m k are sums of boxcar sequences of length L and a complementary code sequence of length L, for some integer L>1.
References Cited (Backward Citations)
No citation records indexed.
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