CA2218951C - Optical signal power detection with signature bit pattern in wdm systems - Google Patents
Optical signal power detection with signature bit pattern in wdm systems Download PDFInfo
- Publication number
- CA2218951C CA2218951C CA002218951A CA2218951A CA2218951C CA 2218951 C CA2218951 C CA 2218951C CA 002218951 A CA002218951 A CA 002218951A CA 2218951 A CA2218951 A CA 2218951A CA 2218951 C CA2218951 C CA 2218951C
- Authority
- CA
- Canada
- Prior art keywords
- signal
- bit pattern
- power
- optical
- signature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 230000003287 optical effect Effects 0.000 title claims abstract 26
- 238000001514 detection method Methods 0.000 title claims 3
- 238000000034 method Methods 0.000 claims abstract 12
- 230000005540 biological transmission Effects 0.000 claims abstract 9
- 238000001914 filtration Methods 0.000 claims 1
- 238000010079 rubber tapping Methods 0.000 claims 1
- 238000005070 sampling Methods 0.000 claims 1
- 239000000835 fiber Substances 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0221—Power control, e.g. to keep the total optical power constant
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optical Communication System (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
The power of an optical signal (s1) travelling on a channel (.lambda.1) of a WDM transmission system, is measured using a signature bit pattern (s BP1) which is inserted in the frame of the optical signal (s1). The power level of s BP1 is adjusted at the launching point to a predetermined ratio (m) with the power of the optical signal. At a point of interest, the fiber is tapped and a fraction of the tapped signal, that includes a corresponding fraction of s BP1, is converted to an electrical signal. The fraction of s BP1 is extracted from a the electrical signal and power of s BP1 is measured. This gives the optical power of s1 as (m) is known and also the calibration constant for the respective channel (.lambda.1) is known. The method can be applied for any and all channels of the WDM transmission system.
Claims (16)
1. A method for measuring the power of an optical signal (s1) within a frame travelling on a first channel (.lambda.1) of a WDM transmission system between a transmit terminal and a receive terminal, comprising the steps for:
at said transmit terminal, generating a signature bit pattern (s BP1);
inserting said signature bit pattern (s BP1) into the frame of said optical signal (s1) and transmitting same along a span of a transmission medium;
at a point of interest along said span, measuring the power P BP1 of said signature bit pattern (s BP1); and determining the optical power P1 of said optical signal (s1) in said point of interest using the relationship P1 =P BP1 /m, where m is a predetermined ratio.
at said transmit terminal, generating a signature bit pattern (s BP1);
inserting said signature bit pattern (s BP1) into the frame of said optical signal (s1) and transmitting same along a span of a transmission medium;
at a point of interest along said span, measuring the power P BP1 of said signature bit pattern (s BP1); and determining the optical power P1 of said optical signal (s1) in said point of interest using the relationship P1 =P BP1 /m, where m is a predetermined ratio.
2. A method as claimed in claim 1, wherein said signature bit pattern (s BP1) is unique to said span.
3. A method as claimed in claim 1, wherein said step of inserting comprises providing the bits of said signature bit pattern (s BP1) in predetermined positions of the frame of said optical signal (s1) just before launching said signal on said span.
4. A method as claimed in claim 3, further comprising:
providing a plurality of optical signals (s i), each for a respective transmission channel (.lambda.i), where I ~ [2, n]; and multiplexing said optical signal (s1), comprising said signature bit pattern (s BP1), with said optical signals (s i) into a multichannel signal (s) and launching said multichannel signal (s) on said span.
providing a plurality of optical signals (s i), each for a respective transmission channel (.lambda.i), where I ~ [2, n]; and multiplexing said optical signal (s1), comprising said signature bit pattern (s BP1), with said optical signals (s i) into a multichannel signal (s) and launching said multichannel signal (s) on said span.
5. A method as claimed in claim 4, wherein said step of measuring the power of said signature bit pattern (s BP1) comprises:
tapping a fraction of said multi-channel signal (s) in said point of interest;
converting said fraction into an electrical signal (v);
filtering said electrical signal (v) to pass a signature signal of a band comprising the frequency components of said signature bit pattern; and measuring the root mean square rms sB1 value of said signature signal.
tapping a fraction of said multi-channel signal (s) in said point of interest;
converting said fraction into an electrical signal (v);
filtering said electrical signal (v) to pass a signature signal of a band comprising the frequency components of said signature bit pattern; and measuring the root mean square rms sB1 value of said signature signal.
6. A method as claimed in claim 5, wherein said step of determining the optical power (P1) of said optical signal (s1) comprises applying said ratio (m) to said rms sB1 value.
7. A method as claimed in claim 6, further comprising applying a correction factor (a) to said (P1).
8. A method as claimed in claim 5, wherein measuring the root mean square rms sB1 value of said signature signal is performed with an analog filter with peak detect circuitry.
9. A method as claimed in claim 5, wherein said step of measuring the root mean square rms sB1 value of said signature signal comprises digital matched filter detection.
10. A method as claimed in claim 9, wherein said digital matched filter detection is performed with a super Nyquist sampling analog-to-digital converter and a digital signal processing unit.
11. A method as claimed in claim 4, wherein each of said optical signals (s i) comprises a respective signature bit pattern (s BPi) for detecting a respective optical power (P i) of a respective optical signal (s i) in said point of interest.
12. An apparatus for measuring the power of an optical signal s i travelling on a first channel .lambda.1 of a WDM transmission system between a transmit terminal and a receive terminal, comprising, at a transmit site a signature bit pattern generator for generating a signature bit pattern s BP1 of a power level P BP1 at a predetermined ratio m with the power P1 of said optical signal; and an optical transmitter for inserting said s BP1 into the frame of said s1 and launching said s1 with said s BP1 along a span of said transmission system.
13. An apparatus as claimed in claim 12, further comprising means for measuring the power of said s BP1, for determining the optical power of said s1.
14. An apparatus for measuring the power of an optical signal s1 travelling on a first channel .lambda.1 of a WDM transmission system between a transmit terminal and a receive terminal, comprising:
means for receiving a fraction of said optical signal s1 with a signature bit pattern s BP1 multiplexed into pre-selected time-slots of the frame of said optical signal s1 and converting same into an electrical signal v;
means for separating said electrical signal v to separate a signature signal of a band comprising the frequency components of said signature bit pattern s BP1 ; and an rms detector for measuring the root mean square value rms sB1 value of said signature bit pattern s BP1.
means for receiving a fraction of said optical signal s1 with a signature bit pattern s BP1 multiplexed into pre-selected time-slots of the frame of said optical signal s1 and converting same into an electrical signal v;
means for separating said electrical signal v to separate a signature signal of a band comprising the frequency components of said signature bit pattern s BP1 ; and an rms detector for measuring the root mean square value rms sB1 value of said signature bit pattern s BP1.
15. An apparatus as claimed in claim 14, wherein said means for receiving is arranged to be coupled at a point of interest along a span of said transmission system.
16. An apparatus as claimed in claim 15, wherein said means for receiving comprises a four port optical tap connected on said span at said point of interest for separating a fraction of said s1.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002218951A CA2218951C (en) | 1997-10-22 | 1997-10-22 | Optical signal power detection with signature bit pattern in wdm systems |
| US08/986,027 US6239889B1 (en) | 1997-10-22 | 1997-12-05 | Optical signal power detection with signature bit pattern in WDM systems |
| DE69823609T DE69823609T2 (en) | 1997-10-22 | 1998-10-13 | Monitoring the optical signal power with a signature bit pattern in WDM systems |
| EP98308286A EP0911994B1 (en) | 1997-10-22 | 1998-10-13 | Optical signal power detection with signature bit pattern in WDM systems |
| JP10299198A JPH11194050A (en) | 1997-10-22 | 1998-10-21 | Measuring method for light signal power |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002218951A CA2218951C (en) | 1997-10-22 | 1997-10-22 | Optical signal power detection with signature bit pattern in wdm systems |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2218951A1 CA2218951A1 (en) | 1999-04-22 |
| CA2218951C true CA2218951C (en) | 2004-12-07 |
Family
ID=4161667
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002218951A Expired - Fee Related CA2218951C (en) | 1997-10-22 | 1997-10-22 | Optical signal power detection with signature bit pattern in wdm systems |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US6239889B1 (en) |
| EP (1) | EP0911994B1 (en) |
| JP (1) | JPH11194050A (en) |
| CA (1) | CA2218951C (en) |
| DE (1) | DE69823609T2 (en) |
Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3922819B2 (en) * | 1998-09-21 | 2007-05-30 | 富士通株式会社 | Error correction method and apparatus |
| US6748179B2 (en) * | 2001-03-07 | 2004-06-08 | Harris Corporation | WDM channel monitoring system and method |
| US7076164B2 (en) * | 2001-06-22 | 2006-07-11 | Tellabs Operations, Inc. | System and method for measuring power of optical signals carried over a fiber optic link |
| US7124181B1 (en) | 2001-06-29 | 2006-10-17 | Mcafee, Inc. | System, method and computer program product for improved efficiency in network assessment utilizing variable timeout values |
| US6753960B1 (en) | 2001-12-05 | 2004-06-22 | Capella Photonics, Inc. | Optical spectral power monitors employing frequency-division-multiplexing detection schemes |
| US7035544B1 (en) | 2001-12-27 | 2006-04-25 | Mcafee, Inc. | Identification of related communications channels in a wavelength division multiplexed optical network |
| US20030165343A1 (en) * | 2002-03-01 | 2003-09-04 | Dietmar Spanke | Optoelectronic communication system |
| US7212742B2 (en) * | 2002-04-12 | 2007-05-01 | Fujitsu Limited | Power level management in optical networks |
| US7209655B2 (en) * | 2002-04-12 | 2007-04-24 | Fujitsu Limited | Sharing of power level information to support optical communications |
| US7209656B2 (en) * | 2002-04-12 | 2007-04-24 | Fujitsu Limited | Management of optical links using power level information |
| US20040027384A1 (en) * | 2002-08-12 | 2004-02-12 | Gilbert Levesque | End-to-end tracing of wavelength parameters in a wavelength division multiplexing span of a fiber optic network |
| EP1769594A1 (en) * | 2004-06-30 | 2007-04-04 | Siemens Aktiengesellschaft | Method and apparatus for obtaining an optical power level in a pon |
| US7557789B2 (en) * | 2005-05-09 | 2009-07-07 | Texas Instruments Incorporated | Data-dependent, logic-level drive scheme for driving LCD panels |
| CN101938313B (en) * | 2010-07-26 | 2014-04-02 | 华为技术有限公司 | Optical signal processing method, device and system in passive optical network |
| WO2012031334A1 (en) * | 2010-09-10 | 2012-03-15 | Ausanda Communications Pty Ltd | Method and apparatus for multi-bit per symbol optical modulation and transmission |
| US9236939B2 (en) * | 2014-06-04 | 2016-01-12 | The United States Of America As Represented By The Secretary Of The Navy | Atmospheric transmissometer using a modulated optical source |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54105404A (en) | 1978-02-06 | 1979-08-18 | Nec Corp | Data transmission system |
| JPS62139150A (en) | 1985-12-12 | 1987-06-22 | Matsushita Electric Ind Co Ltd | Optical disk substrate |
| JPS6385934A (en) | 1986-09-30 | 1988-04-16 | Toshiba Corp | Intelligent work station |
| JPS63203027A (en) | 1987-02-18 | 1988-08-22 | Mitsubishi Electric Corp | Optical relay transmission system |
| JPH0466835A (en) | 1990-07-06 | 1992-03-03 | Advantest Corp | Testing device of optical waveguide |
| JPH05235810A (en) * | 1992-02-20 | 1993-09-10 | Nec Corp | Remote control system and terminal station equipment used for said system and relay station equipment |
| ATE178173T1 (en) * | 1993-09-30 | 1999-04-15 | Ant Nachrichtentech | OPTICAL MESSAGE TRANSMISSION METHOD AND INTERMEDIATE AMPLIFIER THEREFOR |
| US5513029A (en) * | 1994-06-16 | 1996-04-30 | Northern Telecom Limited | Method and apparatus for monitoring performance of optical transmission systems |
| CA2155693C (en) * | 1994-08-25 | 1999-12-14 | Daniel A. Fishman | Performance monitoring and fault location in optical transmission systems |
| JPH09224016A (en) | 1996-02-15 | 1997-08-26 | Nippon Hoso Kyokai <Nhk> | Device and method for detecting light intensity |
| US5699081A (en) * | 1996-09-26 | 1997-12-16 | Lucent Technologies Inc. | Apparatus and method for automatically provisioning power on a per channel basis in a communications transmission system |
| US6043915A (en) * | 1997-03-31 | 2000-03-28 | Lucent Technologies Inc. | Stabilization of a multi-channel optical signal transmitter through correlation feedback |
| US6111676A (en) * | 1998-02-26 | 2000-08-29 | Nortel Networks Corporation | Wavelength specific optical reflection meter/locator in signatured wavelength division multiplexed systems |
-
1997
- 1997-10-22 CA CA002218951A patent/CA2218951C/en not_active Expired - Fee Related
- 1997-12-05 US US08/986,027 patent/US6239889B1/en not_active Expired - Lifetime
-
1998
- 1998-10-13 EP EP98308286A patent/EP0911994B1/en not_active Expired - Lifetime
- 1998-10-13 DE DE69823609T patent/DE69823609T2/en not_active Expired - Fee Related
- 1998-10-21 JP JP10299198A patent/JPH11194050A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| EP0911994A3 (en) | 2001-05-02 |
| CA2218951A1 (en) | 1999-04-22 |
| DE69823609T2 (en) | 2004-09-16 |
| DE69823609D1 (en) | 2004-06-09 |
| EP0911994B1 (en) | 2004-05-06 |
| US6239889B1 (en) | 2001-05-29 |
| EP0911994A2 (en) | 1999-04-28 |
| JPH11194050A (en) | 1999-07-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |