US5157652A
Expired / Lapsed
US
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Measurement of characteristics of broadcast optical networks
Assignee: Agilent Technologies Inc
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Filing: 1990-07-24
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Granted: 1992-10-20
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Expires: 2010-07-24
Abstract
Abstract The present invention provides techniques for analyzing sub-carrier multiplexed (SCM) networks in which a pseudo-random binary sequence (PRBS) test signal is applied to a component or components of the network and the resulting signal is analyzed. A phase locked loop circuit extracts the PRBS and provides a signal which removes from the test signal the frequency component corresponding to the channel under investigation. The spectral properties of the PRBS enable broadband analysis of an SCM network to be carried out.
Inventors
- 👤 Stuart D. Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:20
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/07
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
72 words
A method of measuring characteristics of a device in an optical network, the method comprising the following steps: (a) applying a test signal to a device under test, the test signal being a pseudo-random binary sequence; (b) analyzing a resulting output from the device under test; and (c) removing a spectral component of the sequence corresponding to a channel under investigation prior to application of the sequence to the device under test.
Claim 2
Independent Claim
72 words
A method of measuring characteristics of a device in an optical network, the method comprising the following steps: (a) applying a test signal to a device under test, the test signal being a pseudo-random binary sequence; (b) analyzing a resulting output from the device under test; and (c) removing a spectral component of the sequence corresponding to a channel under investigation prior to application of the sequence to the device under test.
Claim 3
Dependent Claim
14 words
The method recited in claim 1, wherein the network is a sub-carrier multiplexing network.
Claim 4
Dependent Claim
23 words
The method recited in claim 1, wherein the cancellation signal for removing the spectral component is generated using a phase locked loop circuit.
Claim 5
Dependent Claim
23 words
The method recited in claim 2, wherein a cancellation signal for removing the spectral component is generated using a phase locked loop circuit.
Claim 6
Dependent Claim
35 words
The method recited in claim 4, wherein the pseudo random binary sequence is extracted in optical form from the sub-carrier multiplexing network and coupled to the phase locked loop circuit to provide the cancellation signal.
Claim 7
Independent Claim
73 words
An apparatus for measuring characteristics of a device in an optical network comprising: (a) means for applying a test signal to a device under test, the test signal being a pseudo-random binary sequence; (b) means for analyzing a resulting output from the device under test; and (c) means for removing a spectral component of the sequence corresponding to a channel under investigation prior to application of the sequence to the device under test.
Claim 8
Independent Claim
73 words
An apparatus for measuring characteristics of a device in an optical network comprising: (a) means for applying a test signal to a device under test, the test signal being a pseudo-random binary sequence; (b) means for analyzing a resulting output from the device under test; and (c) means for removing a spectral component of the sequence corresponding to a channel under investigation prior to application of the sequence to the device under test.
Claim 9
Dependent Claim
14 words
The apparatus recited in claim 6, wherein the network is a sub-carrier multiplexing network.
Claim 10
Dependent Claim
25 words
The apparatus recited in claim 6, wherein the means for removing the spectral component comprises a phase locked loop circuit for generating a cancellation signal.
Claim 11
Dependent Claim
25 words
The apparatus recited in claim 7, wherein the means for removing the spectral component comprises a phase locked loop circuit for generating a cancellation signal.
Claim 12
Dependent Claim
29 words
The apparatus recited in claim 9, wherein the pseudo-random binary sequence is extracted in optical form from the sub-carrier multiplexing network and coupled to the phase locked loop circuit.
Claim 13
Independent Claim
97 words
A method of measuring characteristics of a device in an optical network, the method comprising the following steps: (a) applying a test signal to a device under test, the test signal being a pseudo-random binary sequence; (b) analyzing a resulting output from the device under test; (c) generating with a phase locked loop circuit a cancellation signal for removing a spectral component of the sequence corresponding to a channel under investigation; and (d) removing said spectral component of the sequence in response to said cancellation signal prior to application of the sequence to the device under test.
Claim 14
Independent Claim
97 words
A method of measuring characteristics of a device in an optical network, the method comprising the following steps: (a) applying a test signal to a device under test, the test signal being a pseudo-random binary sequence; (b) analyzing a resulting output from the device under test; (c) generating with a phase locked loop circuit a cancellation signal for removing a spectral component of the sequence corresponding to a channel under investigation; and (d) removing said spectral component of the sequence in response to said cancellation signal prior to application of the sequence to the device under test.
Claim 15
Dependent Claim
14 words
The method recited in claim 11, wherein the network is a sub-carrier multiplexing network.
Claim 16
Dependent Claim
34 words
The method recited in claim 12, wherein the pseudo-random binary sequence is extracted in optical form from the sub-carrier multiplexing network and coupled to the phase locked loop circuit to provide the cancellation signal.
Claim 17
Independent Claim
99 words
An apparatus for measuring characteristics of a device in an optical network comprising: (a) means for applying a test signal to a device under test, the test signal being pseudo-random binary sequence; (b) means for analyzing a resulting output from the device under test; (c) means comprising a phase locked loop circuit for generating a cancellation signal for removing a spectral component of the sequence corresponding to a channel under investigation; and (d) means for removing said spectral component of the sequence in response to said cancellation signal prior to application of the sequence to the device under test.
Claim 18
Independent Claim
99 words
An apparatus for measuring characteristics of a device in an optical network comprising: (a) means for applying a test signal to a device under test, the test signal being pseudo-random binary sequence; (b) means for analyzing a resulting output from the device under test; (c) means comprising a phase locked loop circuit for generating a cancellation signal for removing a spectral component of the sequence corresponding to a channel under investigation; and (d) means for removing said spectral component of the sequence in response to said cancellation signal prior to application of the sequence to the device under test.
Claim 19
Dependent Claim
14 words
An apparatus recited in claim 14, wherein the network is a sub-carrier multiplexing network.
Claim 20
Dependent Claim
29 words
The apparatus recited in claim 14, wherein the pseudo-random binary sequence is extracted in optical form from the sub-carrier multiplexing network and coupled to the phase locked loop circuit.
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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) | 1995-10-20 | 1996-04-20 | 1996-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-10-20 | 2000-04-20 | 2000-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-10-20 | 2004-04-20 | 2004-10-20 | $7700.00 | Window Closed / Lapsed |