US4767207A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for measuring transmission characteristics of an optical fiber
Assignee: Hamamatsu Photonics KK
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Filing: 1985-11-08
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Granted: 1988-08-30
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Expires: 2005-11-08
Abstract
Abstract An apparatus for measuring transmission characteristics of a short optical fiber comprises a streak tube having a photoelectron-emitting surface for receiving through a connector light pulses transmitted simultaneously through a reference optical fiber and an optical fiber under test. The light pulses are generated by a laser and cause the streak tube to generate an optical output signal indicating time-wise changes in the luminance of the pulses transmitted through each of the optical fibers such that differences in light transmission characteristics between the reference optical fiber and the optical fiber under test may be determined.
Inventors
- 👤 Yoshihiro Takiguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:46
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/07; G; G01; G01M; G01M11/00; G01M11/30; G01M11/33; G01M11/332; G01M11/335
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
255 words
An apparatus for measuring transmission characteristics of an optical fiber comprising: means for converting changes in the intensity of light incident upon a photoelectron-emitting surface thereof into an optical output signal indicating time-wise changes in the luminance of said light received by said photo-electron emitting surface, said electron-emitting surface having first and second portions; means for generating short light pulses; a spectrometer having an output connected to said photoelectron-emitting surface of said converting means, said spectrometer having an input for receiving said light pulses and for suplying in response thereto said said output an optical spectrum having an intensity distribution with respect to wavelength; a reference optical fiber having a first end connected to said input of said spectrometer to produce a first optical spectrum on said first portion, said reference optical fiber also having a second end; an optical fiber under test having a first end connected to said input of said spectrometer to produce a second optical spectrum on said second portion, said optical fiber under test also having a second end; and connector means connected to said generating means and to said second end of said reference optical fiber and said second end of said optical fiber under test to supply simultaneously said light pulses to said reference optical fiber and said optical fiber under test such that said optical output signal includes spatially separated representations of said first and second optical spectrums which indicate differences in the light transmission characteristics between said reference optical fiber and said optical fiber under test.
Claim 2
Independent Claim
255 words
An apparatus for measuring transmission characteristics of an optical fiber comprising: means for converting changes in the intensity of light incident upon a photoelectron-emitting surface thereof into an optical output signal indicating time-wise changes in the luminance of said light received by said photo-electron emitting surface, said electron-emitting surface having first and second portions; means for generating short light pulses; a spectrometer having an output connected to said photoelectron-emitting surface of said converting means, said spectrometer having an input for receiving said light pulses and for suplying in response thereto said said output an optical spectrum having an intensity distribution with respect to wavelength; a reference optical fiber having a first end connected to said input of said spectrometer to produce a first optical spectrum on said first portion, said reference optical fiber also having a second end; an optical fiber under test having a first end connected to said input of said spectrometer to produce a second optical spectrum on said second portion, said optical fiber under test also having a second end; and connector means connected to said generating means and to said second end of said reference optical fiber and said second end of said optical fiber under test to supply simultaneously said light pulses to said reference optical fiber and said optical fiber under test such that said optical output signal includes spatially separated representations of said first and second optical spectrums which indicate differences in the light transmission characteristics between said reference optical fiber and said optical fiber under test.
Claim 3
Dependent Claim
37 words
An apparatus according to claim 1, wherein said optical output signal indicate temporal dispersion and waveform distortion of said optical fiber under test at different wavelengths of said light pulses transmitted through said optical fiber under test.
Claim 4
Dependent Claim
21 words
An apparatus according to claim 1, wherein said output optical signal indicates the optical cutoff of said optical fiber under test.
Claim 5
Dependent Claim
156 words
An appatatus for measuring light transmission characteristics of an optical fiber comprising: a streak tube for converting changes in the intensity of light incident upon a photoelectron-emitting surface thereof into an optical output signal indicating time-wise changes in the luminance of said light received by said photoelectron-emitting surface; a reference optical fiber having a first end connected to said photoelectron-emitting surface and a second end; an optical fiber under test having a first end connected to said photoelectron-emitting surface and a second end; means for generating short light pulses; and connector means connected to said generating means and to said second end of said reference optical fiber and said second end of said optical fiber under test to supply said light pulses to said reference optical fiber and said optical fiber under test such that said optical output signal indicates differences in light transmission characteristics between said reference optical fiber and said optical fiber under test.
Claim 6
Dependent Claim
156 words
An appatatus for measuring light transmission characteristics of an optical fiber comprising: a streak tube for converting changes in the intensity of light incident upon a photoelectron-emitting surface thereof into an optical output signal indicating time-wise changes in the luminance of said light received by said photoelectron-emitting surface; a reference optical fiber having a first end connected to said photoelectron-emitting surface and a second end; an optical fiber under test having a first end connected to said photoelectron-emitting surface and a second end; means for generating short light pulses; and connector means connected to said generating means and to said second end of said reference optical fiber and said second end of said optical fiber under test to supply said light pulses to said reference optical fiber and said optical fiber under test such that said optical output signal indicates differences in light transmission characteristics between said reference optical fiber and said optical fiber under test.
Claim 7
Dependent Claim
14 words
An apparatus according to claim 4, wherein said connector means includes a beam splitter.
Claim 8
Dependent Claim
13 words
An apparatus according to claim 4, wherein said generating means comprises a laser.
Claim 9
Dependent Claim
35 words
An apparatus according to claim 4, wherein said optical output signal indicates temporal dispersion and waveform distortions in the light transmission characteristics of said optical fiber under test with respect to said reference optical fiber.
Claim 10
Independent Claim
151 words
An apparatus for measuring light transmission characteristics of an optical fiber comprising: a streak tube for converting changes in the intensity of light incident upon a photoelectron-emitting surface thereof into an optical output signal indicating time-wise changes in the luminance of said light received by said photoelectron-emitting surface; a reference optical fiber having a first end connected to said photoelectron-emitting surface and a second end; an optical fiber under test having a first end connected to said photoelectron-emitting surface and a second end; means for generating short light pulses; connector means connected to said generating means and to said second end of said reference optical fiber and said second end of said optical fiber under test to supply simultaneously said light pulses to said reference optical fiber and said optical fiber under test; and an imaging device for producing optical images of said optical output signal produced by said streak tube.
Claim 11
Independent Claim
151 words
An apparatus for measuring light transmission characteristics of an optical fiber comprising: a streak tube for converting changes in the intensity of light incident upon a photoelectron-emitting surface thereof into an optical output signal indicating time-wise changes in the luminance of said light received by said photoelectron-emitting surface; a reference optical fiber having a first end connected to said photoelectron-emitting surface and a second end; an optical fiber under test having a first end connected to said photoelectron-emitting surface and a second end; means for generating short light pulses; connector means connected to said generating means and to said second end of said reference optical fiber and said second end of said optical fiber under test to supply simultaneously said light pulses to said reference optical fiber and said optical fiber under test; and an imaging device for producing optical images of said optical output signal produced by said streak tube.
Claim 12
Dependent Claim
20 words
An apparatus according to claim 8, further including memory means for storing said optical images produced by said imaging device.
Claim 13
Dependent Claim
13 words
An apparatus according to claim 9, wherein said generating means comprises a laser.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-08-30 | 1992-02-29 | 1992-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-30 | 1996-02-29 | 1996-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-30 | 2000-02-29 | 2000-08-30 | $7700.00 | Window Closed / Lapsed |