CA2261509A1 - Methods for equalizing wdm systems - Google Patents

Methods for equalizing wdm systems Download PDF

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Publication number
CA2261509A1
CA2261509A1 CA002261509A CA2261509A CA2261509A1 CA 2261509 A1 CA2261509 A1 CA 2261509A1 CA 002261509 A CA002261509 A CA 002261509A CA 2261509 A CA2261509 A CA 2261509A CA 2261509 A1 CA2261509 A1 CA 2261509A1
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CA
Canada
Prior art keywords
channel
ber
channels
fail
power
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.)
Granted
Application number
CA002261509A
Other languages
French (fr)
Other versions
CA2261509C (en
Inventor
Chris Wilhelm Barnard
Chung Yu Wu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nortel Networks Ltd
Original Assignee
Nortel Networks Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nortel Networks Corp filed Critical Nortel Networks Corp
Priority to CA002261509A priority Critical patent/CA2261509C/en
Publication of CA2261509A1 publication Critical patent/CA2261509A1/en
Application granted granted Critical
Publication of CA2261509C publication Critical patent/CA2261509C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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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
    • H04B10/29—Repeaters
    • H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
    • H04B10/293—Signal power control
    • H04B10/2933—Signal power control considering the whole optical path
    • H04B10/2935—Signal power control considering the whole optical path with a cascade of amplifiers
    • 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
    • H04J14/02216—Power control, e.g. to keep the total optical power constant by gain equalization
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0201—Add-and-drop multiplexing

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Optical Communication System (AREA)

Abstract

A method of equalizing the channels of a WDM link comprises identifying an error threshold level BER Fail for the BER defined for each signal S(j) in accordance with the channel rate, and determining the attenuation A(j) of, for example, the power P(j) of each signal S(j) transmitted over the WDM link. The transmitter powers are adjusted taking into account the attenuations determined for all channels. The attenuation A(j) for channel (j) is determined by first setting the power P(j) of all signals S(j) to a maximum P Max, attenuating the power P(j) of channel (j) until the BER reaches the threshold value BER Fail, measuring the power corresponding to the BER Fail for that channel, and calculating the difference between the P Max and P(j)Fail. The transmitter powers are then set according to the relationship P(j)=P Max-~ (A(j)-A Min), where ~ is 0.8 for a system with 3-4 channels. The method may be used for multi-channel systems with intermediate nodes where channels are added and dropped.
CA002261509A 1999-02-11 1999-02-11 Methods for equalizing wdm systems Expired - Fee Related CA2261509C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA002261509A CA2261509C (en) 1999-02-11 1999-02-11 Methods for equalizing wdm systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA002261509A CA2261509C (en) 1999-02-11 1999-02-11 Methods for equalizing wdm systems

Publications (2)

Publication Number Publication Date
CA2261509A1 true CA2261509A1 (en) 2000-08-11
CA2261509C CA2261509C (en) 2002-07-02

Family

ID=4163286

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002261509A Expired - Fee Related CA2261509C (en) 1999-02-11 1999-02-11 Methods for equalizing wdm systems

Country Status (1)

Country Link
CA (1) CA2261509C (en)

Also Published As

Publication number Publication date
CA2261509C (en) 2002-07-02

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