WO1998016027B1 - Monitoring system using an optical side tone as a test signal - Google Patents
Monitoring system using an optical side tone as a test signalInfo
- Publication number
- WO1998016027B1 WO1998016027B1 PCT/US1997/018074 US9718074W WO9816027B1 WO 1998016027 B1 WO1998016027 B1 WO 1998016027B1 US 9718074 W US9718074 W US 9718074W WO 9816027 B1 WO9816027 B1 WO 9816027B1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- test
- signal
- optical
- data
- frequency
- Prior art date
Links
- 230000003287 optical Effects 0.000 title claims abstract 23
- 230000005540 biological transmission Effects 0.000 claims abstract 13
- 230000001702 transmitter Effects 0.000 claims abstract 2
- 230000003595 spectral Effects 0.000 claims 5
- 230000003111 delayed Effects 0.000 abstract 1
- 239000000835 fiber Substances 0.000 abstract 1
Abstract
An improved monitoring system for monitoring a fiber optic transmission system using optical side tones. The monitoring system includes a line monitoring equipment (LME) (12) connected to a portion of an optical transmission system. The LME includes a pseudo-random sequence (PRS) tone generator (14) for generating a PRS tone, a laser transmitter (16) for transmitting an LME optical side tone based on the PRS tone. The LME includes a delay system (20) for delaying the PRS tones, an optical filter (26) for passing only the wavelength of the LME side tone. A plurality of data channels are transmitted over the system using WDM. A coupler is used to combine the WDM data with the LME side tone. A repeater (36) having an optical loopback coupler (42) returns a portion of the combined signal to the LME. The comparator/correlator correlates (22) the delayed PRS tones with the LME side tone returned by each repeater.
Claims
AMENDED CLAIMS
[received by the International Bureau on 31 March 1998 (31.03.98); new claims 3-17 added; remaining claims unchanged (3 pages)]
d) a delay system coupled to said tone generator; and e) a correlator coupled to said delay system and said optical filter, said correlator correlating an output of the delay system with an output of the optical filter; an optical coupler combining the test signal with a data signal into a combined signal, said data signal having a data channel, the test signal having a frequency outside the frequency bandwidth of the data channel; a repeater coupled to said optical coupler and having an optical loopback, said loopback returning a portion of the combined signal to the optical filter of the LME; and said delay system delaying the test signal based on a location of said repeater.
3. The test system of claim 1 wherein said tone generator, said laser transmitter, said delay system and said comparator comprise a portion of a line monitoring equipment.
4. The test system of claim 1 wherein the frequency of the test signal is within the spectral bandwidth of the WDM transmission system.
5. The test system of claim 1 wherein said repeater comprises a plurality of optical repeaters located at different locations along the WDM transmission system, each said optical repeater includes an optical loopback.
6. The test system of claim 1 wherein said optical filter is wavelength selective and passes only the wavelength of the test signal.
15
7. The test system of claim 1 wherein said optical loopback returns a portion of a combined signal that includes the test signal and the data signal.
8. The test system of claim 7 wherein said optical filter receives the return signal from the optical loopback including the test signal and the data signal, the optical filter being wavelength selective and passing only the wavelength of the test signal to the comparator .
9. The test system of claim 1 wherein said test signal has a frequency located near the edge of the spectral bandwidth of the WDM transmission system.
10. The test system of claim 1 wherein said data signal comprises a plurality of data signals, each said data signal having a data channel, said test signal having a frequency outside the frequency bandwidths of the data channels on the WDM transmission system.
11. The test system of claim 10 wherein said test signal has a frequency located near the edge of the spectral bandwidth of the WDM transmission system.
12. The test system of claim 10 wherein said test signal has a frequency located between two of said data channels on said WDM transmission system.
13. The test system of claim 2 wherein the frequency of the test signal is within the spectral bandwidth of the WDM transmission system.
14. The test system of claim 2 wherein said repeater comprises a plurality of optical repeaters located at different locations along the WDM transmission system, each said optical repeater includes an optical loopback.
16
15. The test system of claim 2 wherein said data signal comprises a plurality of data signals, each said data signal having a data channel, said test signal having a frequency outside the frequency bandwidths of the data channels on the WDM transmission system.
16. The test system of claim 15 wherein said test signal has a frequency located near the edge of the spectral bandwidth of the WDM transmission system.
17. The test system of claim 15 wherein said test signal has a frequency located between two of said data channels on said WDM transmission system.
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP97911628A EP0950293B1 (en) | 1996-10-09 | 1997-10-08 | Monitoring system using an optical side tone as a test signal |
AU48953/97A AU719961B2 (en) | 1996-10-09 | 1997-10-08 | Monitoring system using an optical side tone as a test signal |
DE69736560T DE69736560T2 (en) | 1996-10-09 | 1997-10-08 | MONITORING SYSTEM USING AN OPTICAL BACK-UP SIGNAL AS A TEST SIGNAL |
CA002267777A CA2267777C (en) | 1996-10-09 | 1997-10-08 | Monitoring system using an optical side tone as a test signal |
JP51767198A JP4213218B2 (en) | 1996-10-09 | 1997-10-08 | Monitoring system using optical sidetone as test signal |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/728,515 | 1996-10-09 | ||
US08/728,515 US5969833A (en) | 1996-10-09 | 1996-10-09 | Monitoring system using an optical side tone as a test signal |
Publications (2)
Publication Number | Publication Date |
---|---|
WO1998016027A1 WO1998016027A1 (en) | 1998-04-16 |
WO1998016027B1 true WO1998016027B1 (en) | 1998-05-14 |
Family
ID=24927168
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1997/018074 WO1998016027A1 (en) | 1996-10-09 | 1997-10-08 | Monitoring system using an optical side tone as a test signal |
Country Status (8)
Country | Link |
---|---|
US (1) | US5969833A (en) |
EP (1) | EP0950293B1 (en) |
JP (1) | JP4213218B2 (en) |
AU (1) | AU719961B2 (en) |
CA (1) | CA2267777C (en) |
DE (1) | DE69736560T2 (en) |
TW (1) | TW359922B (en) |
WO (1) | WO1998016027A1 (en) |
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US6134032A (en) * | 1999-04-02 | 2000-10-17 | Tyco Submarine Systems Ltd. | Method and apparatus for automatically identifying system faults in an optical communications system from repeater loop gain signatures |
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US6778778B1 (en) * | 2001-01-11 | 2004-08-17 | Sprint Communications Company, L.P. | Arrangement and method for testing fiber optic telecommunications circuits over dense wavelength division multiplexing (DWDM) |
DE10112813A1 (en) * | 2001-03-16 | 2002-10-02 | Siemens Ag | Method for transmitting data with an optical wavelength multiplex system subdivides a wavelength band into two adjacent sub-bands with a preset band gap at a minimum wavelength distance to avoid crosstalk. |
US20020154351A1 (en) * | 2001-04-24 | 2002-10-24 | Feinberg Lee Daniel | Optical network architecture with reduced equipment |
US6563979B2 (en) | 2001-06-22 | 2003-05-13 | Dorsal Networks, Inc. | Automatically switched redundant switch configurations |
US20040105136A1 (en) * | 2001-05-08 | 2004-06-03 | Corvis Corporation | Interconnections and protection between optical communications networks |
US6556319B2 (en) * | 2001-05-08 | 2003-04-29 | Dorsal Networks, Inc. | Split redundant trunk architecture using passive splitters and path switching |
WO2003001706A1 (en) * | 2001-06-22 | 2003-01-03 | Tellabs Operations, Inc. | System and method for measuring power of optical signals carried over a fiber optic link |
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KR20020009542A (en) * | 2001-12-06 | 2002-02-01 | 엔엠소프트(주) | method and apparatus for monitoring optical fiber, equipments and environmental states of remote communication stations by using a test signal |
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US20040126119A1 (en) * | 2002-08-20 | 2004-07-01 | Evangelides Stephen G. | Method and apparatus for providing a terminal independent interface between a terrestrial optical terminal and an undersea optical transmission path |
US20040047295A1 (en) * | 2002-08-20 | 2004-03-11 | Morreale Jay P. | Method and apparatus for providing a common optical line monitoring and service channel over an WDM optical transmission system |
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US20050013610A1 (en) * | 2003-07-16 | 2005-01-20 | Evangelides Stephen G. | Optical performance monitoring between terminal equipment and an optical interface to an optical submarine transmission line |
JP4229810B2 (en) * | 2003-11-10 | 2009-02-25 | 富士通株式会社 | Communication test equipment |
US20050232634A1 (en) * | 2004-03-29 | 2005-10-20 | Evangelides Stephen G Jr | Undersea optical transmission system employing low power consumption optical amplifiers |
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JP4516868B2 (en) * | 2005-03-22 | 2010-08-04 | 富士通株式会社 | Fault point evaluation method, apparatus and system for optical amplification multistage relay transmission line |
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-
1996
- 1996-10-09 US US08/728,515 patent/US5969833A/en not_active Expired - Lifetime
-
1997
- 1997-10-08 JP JP51767198A patent/JP4213218B2/en not_active Expired - Fee Related
- 1997-10-08 AU AU48953/97A patent/AU719961B2/en not_active Ceased
- 1997-10-08 EP EP97911628A patent/EP0950293B1/en not_active Expired - Lifetime
- 1997-10-08 WO PCT/US1997/018074 patent/WO1998016027A1/en active IP Right Grant
- 1997-10-08 DE DE69736560T patent/DE69736560T2/en not_active Expired - Lifetime
- 1997-10-08 CA CA002267777A patent/CA2267777C/en not_active Expired - Fee Related
- 1997-12-16 TW TW086114863A patent/TW359922B/en active
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