WO1998016027B1 - Monitoring system using an optical side tone as a test signal - Google Patents

Monitoring system using an optical side tone as a test signal

Info

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
Application number
PCT/US1997/018074
Other languages
French (fr)
Other versions
WO1998016027A1 (en
Filing date
Publication date
Priority claimed from US08/728,515 external-priority patent/US5969833A/en
Application filed filed Critical
Priority to EP97911628A priority Critical patent/EP0950293B1/en
Priority to AU48953/97A priority patent/AU719961B2/en
Priority to DE69736560T priority patent/DE69736560T2/en
Priority to CA002267777A priority patent/CA2267777C/en
Priority to JP51767198A priority patent/JP4213218B2/en
Publication of WO1998016027A1 publication Critical patent/WO1998016027A1/en
Publication of WO1998016027B1 publication Critical patent/WO1998016027B1/en

Links

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.
PCT/US1997/018074 1996-10-09 1997-10-08 Monitoring system using an optical side tone as a test signal WO1998016027A1 (en)

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

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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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