WO2000069103A2 - Anordnung zur überwachung der performance von d-wdm mehrwell enlängen- systemen - Google Patents
Anordnung zur überwachung der performance von d-wdm mehrwell enlängen- systemen Download PDFInfo
- Publication number
- WO2000069103A2 WO2000069103A2 PCT/DE2000/001267 DE0001267W WO0069103A2 WO 2000069103 A2 WO2000069103 A2 WO 2000069103A2 DE 0001267 W DE0001267 W DE 0001267W WO 0069103 A2 WO0069103 A2 WO 0069103A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- arrangement according
- demultiplexer
- wavelength
- polarization
- wdm
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
- H04B10/07955—Monitoring or measuring power
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/077—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using a supervisory or additional signal
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
Definitions
- the invention relates to an arrangement for monitoring the performance of D-WDM multi-wavelength systems.
- D-WDM systems are known, for example, from the company publication "Basis Giveaway D-WDM Systeme” by Profile Optician Systeme GmbH, DE, January 1999. Reference is expressly made to this company publication to explain all of the details not described here.
- D-WDM systems - Dense avelength division multiplex also known as tightly packed WDM systems or dense WDM systems - information or messages about light signals at different wavelengths are transmitted via just one fiber. Each wavelength carries an information signal.
- the most important parameters include the wavelength and the power, the wavelength drift of the lasers, and the signal / noise ratio in each transmission channel.
- Typical specification requirements for monitoring are:
- tunable narrow-band filters are used for wavelength selection.
- Acousto-optical filters e.g. from Wandel & Golterann
- piezoelectrically controlled microfilters e.g. from Queensgate
- Another variant is the grating monochromator technology, in which either the grating is rotated and the spatially resolved signal spectrum is scanned with a single photodiode; alternatively, the grating can be fixed and a scanning deflection mirror can be provided in front of the exit slit of the monochromator (e.g. from Photonetics).
- a fixed grid can be used together with a photodiode array as a detector unit (e.g. Yokogawa).
- the spectrum is obtained from the detector signal of a Michelson interferometer with variable path lengths with the aid of the Fourier transformation (e.g. from Hewlett Packard).
- the aim of the invention is to implement a suitable compact measuring system which enables the channels of a D-WDM system to be permanently and parallel monitored for frequency, power, drift and SNR (signal / noise ratio) with measuring times in the ms range.
- a special demultiplexer of the D-WDM technology is used combined with an array of photodetectors.
- phased array demultiplexer The property of a phased array demultiplexer is preferably exploited such that the channel center frequencies of such a demultiplexer can be changed in a defined manner by changing the temperature. If the temperature is changed periodically and measured at the same time, the center frequencies of each separated channel can be clearly assigned.
- the filter profile of each channel of the demultiplexer is Gaussian.
- the output signal of the photodetector arranged at each channel output is the time average over the applied spectral function evaluated by the filter function.
- the system contains no moving parts.
- the channels to be monitored are separated using an assembly with integrated optics.
- the parallel data acquisition ensures short measuring times.
- the modules used are largely insensitive to polarization.
- the system has negligible repercussions.
- the measuring system is compact. Influences on the measurement accuracy due to undefined polarization directions of the spectra to be measured are prevented by the upstream connection of a device for polarization manipulation. Devices that statistically change the polarization direction (polarization scrambler) and polarization switches can be used for this.
- Fig. 1 shows the basic structure of a D-WDM monitor.
- the D-WDM spectrum to be examined is fed in at the fiber input (1) of a demultiplexer (2).
- the demultiplexer (2) separates n channels at its output; the number n depends on how many outputs this component is specified for.
- n photodetectors (4) are attached to the outputs, each of which detects the radiation of an output channel of the demultiplexer (2).
- the electrical signals are fed through the n-channel (5) to the evaluation unit (6) and the display and control unit (7).
- a feedback (8) from the display and control unit (7) periodically changes the pass characteristic of the demultiplexer (2) via a modulation device (3).
- the demultiplexer (2) is a phased array demultiplexer, which is changed in the characteristics by a substrate temperature control (10).
- the current temperature is measured via an integrated sensor (11), the signal (9) of which is evaluated by the display and control unit (7) and used for sequence control.
- FIG. 3 shows an arrangement in which the polarization direction of the input signal, which is not necessarily fixed, is statistically distributed by a polarization cambler (12) in order to avoid measurement errors due to polarization.
- Fig. 4 the scrambler is replaced by a polarization switch (13) which switches periodically and synchronously with the data acquisition and processing between two orthogonal polarization states and provides a defined polarization state to the input of the phased array by a further polarizer. This allows measurement errors due to changing polarization directions of the input signal to be eliminated.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Optical Communication System (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP00940143A EP1173938A2 (de) | 1999-04-23 | 2000-04-25 | Anordnung zur überwachung der performance von d-wdm mehrwellenlängensystemen |
JP2000617587A JP3727852B2 (ja) | 1999-04-23 | 2000-04-25 | D−wdm多重波長システムの性能監視装置 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1999118630 DE19918630A1 (de) | 1999-04-23 | 1999-04-23 | Anordnungen zur Überwachung der Performance von D-WDM Mehrwellenlängensystemen |
DE19918630.8 | 1999-04-23 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2000069103A2 true WO2000069103A2 (de) | 2000-11-16 |
WO2000069103A3 WO2000069103A3 (de) | 2001-04-12 |
Family
ID=7905714
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2000/001267 WO2000069103A2 (de) | 1999-04-23 | 2000-04-25 | Anordnung zur überwachung der performance von d-wdm mehrwell enlängen- systemen |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1173938A2 (de) |
JP (1) | JP3727852B2 (de) |
DE (1) | DE19918630A1 (de) |
WO (1) | WO2000069103A2 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10020878B2 (en) | 2015-04-17 | 2018-07-10 | Fujitsu Limited | Optical signal-to-noise ratio monitor and method for measuring optical signal to-noise ratio |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB0111049D0 (en) * | 2001-05-04 | 2001-06-27 | Bookham Technology Plc | Optic device and method of operating the same |
KR20040066888A (ko) | 2001-12-10 | 2004-07-27 | 이 아이 듀폰 디 네모아 앤드 캄파니 | 파장 분할 다중 전송 광학 성능 모니터 |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0703679A2 (de) * | 1994-09-26 | 1996-03-27 | Nippon Telegraph And Telephone Corporation | Schaltung zur gleichzeitiger Überwachung mehrerer Wellenlängen unter Verwendung eines aus gruppierten Wellenleiter gebautes Gitters |
-
1999
- 1999-04-23 DE DE1999118630 patent/DE19918630A1/de not_active Ceased
-
2000
- 2000-04-25 EP EP00940143A patent/EP1173938A2/de not_active Withdrawn
- 2000-04-25 JP JP2000617587A patent/JP3727852B2/ja not_active Expired - Lifetime
- 2000-04-25 WO PCT/DE2000/001267 patent/WO2000069103A2/de not_active Application Discontinuation
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0703679A2 (de) * | 1994-09-26 | 1996-03-27 | Nippon Telegraph And Telephone Corporation | Schaltung zur gleichzeitiger Überwachung mehrerer Wellenlängen unter Verwendung eines aus gruppierten Wellenleiter gebautes Gitters |
Non-Patent Citations (4)
Title |
---|
KOHTOKU M ET AL: "Packaged polarization-insensitive WDM monitor with low loss (7.3 dB) and wide tuning range (4.5 nm)" IEEE PHOTONICS TECHNOLOGY LETTERS, NOV. 1998, IEEE, USA, Bd. 10, Nr. 11, November 1998 (1998-11), Seiten 1614-1616, XP002146720 ISSN: 1041-1135 * |
OTSUKA K ET AL: "A high-performance optical spectrum monitor with high-speed measuring time for WDM optical networks" 11TH INTERNATIONAL CONFERENCE ON INTEGRATED OPTICS AND OPTICAL FIBRE COMMUNICATIONS 23RD EUROPEAN CONFERENCE ON OPTICAL COMMUNICATIONS IOOC-ECOC 97 (CONF. PUBL. NO.448), 11TH INTERNATIONAL CONFERENCE ON INTEGRATED OPTICS AND OPTICAL FIBRE COMMUNICATI, 22. September 1997 (1997-09-22), Seiten 147-150 vol.2, XP002146722 1997, London, UK, IEE, UK ISBN: 0-85296-697-0 * |
SHAN ZHONG ET AL: "Full-coverage multichannel wavelength-monitoring circuit for WDM system" TECHNICAL DIGEST. SUMMARIES OF PAPERS PRESENTED AT THE CONFERENCE ON LASERS AND ELECTRO-OPTICS. CONFERENCE EDITION. 1998 TECHNICAL DIGEST SERIES, VOL.6 (IEEE CAT. NO.98CH36178), TECHNICAL DIGEST SUMMARIES OF PAPERS PRESENTED AT THE CONFERENCE ON LASE, 3. Mai 1998 (1998-05-03), Seiten 28-29, XP002146721 1998, Washington, DC, USA, Opt. Soc. America, USA ISBN: 1-55752-339-0 * |
TESHIMA M ET AL: "100-GHZ-SPACED 8-CHANNEL FREQUENCY CONTROL OF DBR LASERS FOR VIRTUAL WAVELENGHT PATH CROSS-CONNECT SYSTEM" IEEE PHOTONICS TECHNOLOGY LETTERS,US,IEEE INC. NEW YORK, Bd. 8, Nr. 12, 1. Dezember 1996 (1996-12-01), Seiten 1701-1703, XP000679554 ISSN: 1041-1135 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10020878B2 (en) | 2015-04-17 | 2018-07-10 | Fujitsu Limited | Optical signal-to-noise ratio monitor and method for measuring optical signal to-noise ratio |
Also Published As
Publication number | Publication date |
---|---|
WO2000069103A3 (de) | 2001-04-12 |
JP3727852B2 (ja) | 2005-12-21 |
DE19918630A1 (de) | 2000-11-16 |
JP2003526232A (ja) | 2003-09-02 |
EP1173938A2 (de) | 2002-01-23 |
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