WO2004068093A1 - Procede et circuit pour la determination de la longueur d'onde, et appareil fonctionnant selon ce procede et comprenant ce circuit - Google Patents

Procede et circuit pour la determination de la longueur d'onde, et appareil fonctionnant selon ce procede et comprenant ce circuit Download PDF

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Publication number
WO2004068093A1
WO2004068093A1 PCT/JP2003/000921 JP0300921W WO2004068093A1 WO 2004068093 A1 WO2004068093 A1 WO 2004068093A1 JP 0300921 W JP0300921 W JP 0300921W WO 2004068093 A1 WO2004068093 A1 WO 2004068093A1
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WO
WIPO (PCT)
Prior art keywords
wavelength
unit
signal
optical
supplied
Prior art date
Application number
PCT/JP2003/000921
Other languages
English (en)
Japanese (ja)
Inventor
Kensuke Matsui
Akihiko Hayashi
Norio Nagase
Kakuji Inoue
Hiroshi Yamada
Original Assignee
Fujitsu Limited
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 Fujitsu Limited filed Critical Fujitsu Limited
Priority to PCT/JP2003/000921 priority Critical patent/WO2004068093A1/fr
Publication of WO2004068093A1 publication Critical patent/WO2004068093A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/03—WDM arrangements
    • H04J14/0307—Multiplexers; Demultiplexers

Definitions

  • the present invention relates to a wavelength detection method, a wavelength detection circuit, and an apparatus using the same, and more particularly, to a wavelength detection method, a wavelength detection circuit, and an apparatus using the same for detecting a wavelength component propagating in a WDM optical communication system.
  • Optical communication systems are evolving into systems in which the optical processing domain called the photonic network is expanded to the conventional electrical domain, and one of the technologies supporting this is wavelength division multiplexing (WDM) optical communication.
  • WDM wavelength division multiplexing
  • a WDM optical communication system it is necessary to arrange and maintain a high density of optical signals to be propagated.
  • the wavelength is detected using an optical spectrum analyzer, and the system is controlled.
  • An optical spectrum analyzer monitors an electric power level by scanning an optical filter, and has a problem that an optical component such as a prism is required, so that a mounting area is increased and a cost is increased. . Disclosure of the invention
  • the present invention can detect a plurality of wavelengths included in an optical signal to be detected collectively, can omit optical components such as a prism, and can reduce the size and cost. And a wavelength detection circuit and a device using the same.
  • the wavelength detection method of the present invention converts an optical signal obtained by modulating a periodically changing reference light with predetermined pattern data to an optical signal to be detected, and then converts it into an electric signal. Detecting an error rate of the electrical signal with respect to the predetermined pattern data, and determining an error rate from the wavelength of the reference light at a timing when the error rate exceeds a predetermined value. It is configured to detect a wavelength component included in the detected optical signal.
  • a plurality of wavelengths included in the optical signal to be detected can be detected at a time, optical components such as a prism can be omitted, and miniaturization and cost reduction can be achieved. It becomes.
  • FIG. 1 is a block diagram of a first embodiment of an optical receiver using the wavelength detection circuit of the present invention.
  • FIG. 2 is a block diagram showing the wavelength detection circuit of FIG. 1 in more detail.
  • FIG. 3 is a signal waveform diagram for explaining the present invention.
  • FIG. 4 is a block diagram showing a circuit configuration for stabilizing the center wavelength.
  • FIG. 5 is a signal waveform diagram for explaining the present invention.
  • FIG. 6 is a block diagram of a second embodiment of the optical receiver using the wavelength detection circuit of the present invention.
  • FIG. 7 is a block diagram of a first embodiment of an optical transmission device using the wavelength detection circuit of the present invention.
  • FIG. 8 is a block diagram of a second embodiment of the optical transmission device using the wavelength detection circuit of the present invention.
  • FIG. 9 is a block diagram of a third embodiment of an optical transmission device using the wavelength detection circuit of the present invention.
  • FIG. 1 is a block diagram of a first embodiment of an optical receiver using the wavelength detection circuit of the present invention.
  • FIG. 2 is a block diagram showing the wavelength detection circuit 16 of FIG. 1 in further detail.
  • the WDM signal propagated through the path is supplied to a branching unit 10 composed of an optical power plug or the like, where it is branched into two.
  • One WDM signal output from the branching unit 10 is separated into each wavelength (for example, wavelength; I1 to I5) by an optical separation unit (optical DEMUX), and the optical signal of each wavelength is received by the reception unit 14. And is converted into an electric signal and output.
  • the other WDM signal output from the branch unit 10 is supplied to the mixing unit 22 in the wavelength detection circuit 16.
  • the processing section 24 in the wavelength detection circuit 16 supplies the digital V control signal to the DZA section 26, and performs digital / analog conversion in the DZA section 26, thereby obtaining the sawtooth shown in FIG.
  • a control signal having a wave shape is generated and supplied to the reference light source 28.
  • the reference light source 28 outputs the reference light whose center wavelength ⁇ 0 changes (scans) at a constant period as shown by the solid line Ia in FIG. I do.
  • the processing unit 24 reads out the random data for error detection stored in the memory 32 and supplies it to the modulation unit 30.
  • the modulation unit 30 modulates the reference light with the random data. Then, a scanning modulated light is generated and supplied to the mixing unit 22. In the mixing unit 22, the WDM signal and the scan modulation light are combined and supplied to the photoelectric conversion unit 34, and the converted electric signal is supplied to the processing unit 24.
  • the processing unit 24 monitors the error rate by comparing the electric signal supplied from the photoelectric conversion unit 34 with random data supplied from the memory 32 to the modulation unit 30.
  • the processing unit 24 performs error detection as shown in FIG. 3 (C).
  • the wavelength included in the WDM signal can be detected from the error detection timing. It is possible to collectively detect the wavelength components of the WDM signal propagating on the main line.
  • the processing unit 24 supplies the detected wavelength information to the control unit 18.
  • the control unit 18 turns on only the photoelectric conversion unit corresponding to the detected wavelength among the photoelectric conversion units ( ⁇ / ⁇ ) 15 1 to 15 ⁇ of each wavelength constituting the reception unit 14, and The control is performed to turn off the other photoelectric conversion units for which is not detected.
  • the control unit 18 may control the center wavelength of the optical filter corresponding to the detected wavelength among the optical filters 13 1 to 13 ⁇ constituting the light separating unit 12. In this way, detection of a plurality of wavelengths of a WDM signal can be performed collectively, and no optical components are required for wavelength detection, so that downsizing and cost reduction can be achieved.
  • the center wavelength ⁇ 0 changes as the environmental temperature changes over time. Therefore, it is necessary to stabilize in some way because it may cause an error in the detection result.
  • the center wavelength ⁇ 0 can be stabilized by using a Peltier element to stabilize the laser element temperature, or by passing a part of the reference light source through an optical filter for wavelength detection and using a photodiode (PD).
  • PD photodiode
  • the processing unit 24 supplies the digital control signal (initial value) read from the memory 32 to the DZA unit 26 at every jf fixed time, for example, and the control signal output from the D / A unit 26
  • control is performed so that the center wavelength of the reference light is fixed to, for example, the wavelength; La for at least a fixed time (monitoring period).
  • a part (wavelength; La) of the reference light passing through the optical filter 36 is photoelectrically converted by a photodiode (PD) 38 and analog / digital converted by an A / D unit 40.
  • PD photodiode
  • the processing unit 24 compares the output level of the photodiode 38 shown in FIG. 5A with the level at the time of setting of the memory 32 during the monitoring period, and outputs the digital control signal so as to maintain the level at the time of setting.
  • the correction is performed and the correction data is stored in the memory 32. Thereafter, the digital control signal for generating the control signal having the sawtooth waveform is corrected using this correction data.
  • FIG. 6 is a block diagram of a second embodiment of the optical receiver using the wavelength detection circuit of the present invention.
  • the same parts as those in FIG. 1 are denoted by the same reference numerals.
  • the WDM signal propagated through the main line is separated into each wavelength (for example, wavelengths 1 to L5) by an optical demultiplexer (optical D EMUX).
  • the signal is supplied to the receiving section 14 through 4 2 _ 5, converted into an electric signal, and output.
  • the branch / detection units 42-1-42-5 have the same configuration, of which the branch-detection unit 42-5 is illustrated in detail.
  • Branch ⁇ Detection part 4 2-5 light of wavelength 5
  • the signal component is supplied to a branching unit 10 composed of an optical power blur or the like, where it is branched into two.
  • One optical signal output from the branching unit 10 is supplied to the receiving unit 14, and the other optical signal is supplied to the mixing unit 22 in the wavelength detection circuit 16.
  • the wavelength detection circuit 16 periodically changes the central wavelength of the reference light; L0, and is supplied from the branching unit 42 based on the error rate caused by beat noise.
  • Five wavelength components are detected from the optical signal, and the detection result is supplied to the control unit 18. The same operation is performed for the other branch / detection sections 42-1 to 42-4.
  • the control unit 18 controls the center wavelength of each of the wavelengths I 1 to L 5 in the receiving unit 14 using the detection result.
  • FIG. 7 is a block diagram of a first embodiment of an optical transmission device using the wavelength detection circuit of the present invention.
  • a transmission unit 50 is supplied with a plurality of series of electric signals, converts each signal into an optical signal of a different wavelength (for example, wavelength; L1 to L5), and then uses an optical filter for each wavelength.
  • the wavelength is controlled and supplied to the optical multiplexing unit (optical MUX) 52.
  • the optical multiplexing unit 52 supplies a WDM signal obtained by multiplexing these wavelengths to the branching unit 54.
  • a branching unit 54 composed of an optical power blur or the like splits the WDM signal into two, sends one to the main line, and supplies the other to the wavelength detection circuit 56.
  • the wavelength detection circuit 56 has the same configuration as the wavelength detection circuit 16 shown in FIG. 2, and as described above, the center wavelength of the reference light; 10 is periodically changed to cause the beat noise.
  • the wavelength included in the WDM signal is detected from the error rate to be detected, and the detection result is supplied to the control unit 58.
  • the control unit 58 controls the center wavelength of each of the wavelengths I 1 to ⁇ 5 in the transmission unit 50 using the detection result.
  • FIG. 8 is a block diagram of a second embodiment of the optical transmission device using the wavelength detection circuit of the present invention.
  • a transmission unit 50 is supplied with a plurality of series of electric signals, converts each signal into an optical signal having a different wavelength (for example, wavelength ⁇ to 15), and then performs wavelength control for each wavelength to output.
  • the optical signal of each wavelength is supplied to an optical multiplexing unit (optical MUX) 62 through a branching / detecting unit 60-1 to 60_5.
  • optical MUX optical multiplexing unit
  • the optical multiplexing unit 62 multiplexes the optical signal of each wavelength supplied from the transmission unit 50 into a WDM signal supplied from the outside, and sends out the obtained WDM signal to the main line.
  • the branch 'detectors 60-1 to 60-5 have the same configuration, and the branch' detector 60-1 is illustrated in detail.
  • the signal component is supplied to a branching unit 54 composed of an optical power blur or the like, where it is branched into two.
  • One optical signal output from the branching unit 54 is supplied to the optical multiplexing unit 62, and the other optical signal is supplied to the wavelength detection circuit 56.
  • the wavelength detection circuit 56 has the same configuration as the wavelength detection circuit 16 shown in FIG.
  • the wavelength ⁇ 1 component is detected from the optical signal supplied from the branching unit 54 based on the rate, and the detection result is supplied to the control unit 58. The same operation is performed for the other branch detection units 60-0 to 60-5.
  • the control section 58 controls the center wavelength of each of the wavelengths L1 to I5 in the transmission section 50 using the above detection result.
  • FIG. 9 is a block diagram of a third embodiment of the optical transmitter using the wavelength detection circuit of the present invention.
  • a transmission unit 50 is supplied with a plurality of series of electric signals, converts each signal into an optical signal of a different wavelength (for example, wavelength ⁇ 1 to 5), and then performs wavelength control with an optical filter for each wavelength. And supplies it to the optical multiplexing unit (optical MUX) 62.
  • the optical multiplexing unit 62 multiplexes the optical signal of each wavelength supplied from the transmitting unit 50 into the WDM signal supplied from the branching unit 64, and sends out the obtained WDM signal to the main line.
  • the WDM signal supplied from the outside is supplied to a branching unit 64 composed of an optical power bra and the like, where it is branched into two.
  • One WDM signal output from the branching unit 64 is supplied to the optical multiplexing unit 62 described above, and the other optical signal is supplied to the wavelength detection circuit 56.
  • the wavelength detection circuit 56 has the same configuration as the wavelength detection circuit 16 shown in FIG. 2, and as described above, the center wavelength of the reference light; L 0 is periodically changed to cause the beat noise.
  • the wavelength included in the WDM signal supplied from the branch unit 64 is detected based on the error rate to be detected, and the detection result is supplied to the control unit 58.
  • the control unit 58 controls the center wavelength using the detection result.
  • the processing section 24, the D / A section 26, the reference light source 28, and the modulation section 30 correspond to the scanning modulated light generating means described in the claims, and the mixing section 22 and the photoelectric conversion section 34 correspond to the mixed conversion.
  • the processing unit 24 corresponds to the detecting means, the optical filter 36 and the photodiode 38 correspond to the level detecting means, the processing unit 24 corresponds to the correcting means, and the memory 34 corresponds to the detecting means. Corresponds to the storage method.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)

Abstract

L'invention concerne un appareil conçu pour le multiplexage d'un signal optique obtenu par modulation d'une lumière de référence dont la longueur d'onde varie périodiquement et présentant des données de référence spécifiées, un signal optique étant détecté avant sa conversion en signal électrique. Ledit appareil détecte le taux d'erreur du signal électrique par rapport aux données de modèle spécifiées, et il détecte les composantes de longueur d'onde comprises dans le signal optique détecté à partir de la longueur d'onde de la lumière de référence au moment où le taux d'erreur dépasse une valeur spécifiée. Avec un tel dispositif, une pluralité de longueurs d'onde comprises dans le signal optique détecté peuvent être détectées collectivement, ce qui permet de se passer de composants optiques, y compris des prismes, et ainsi de réduire la taille et le coût dudit appareil.
PCT/JP2003/000921 2003-01-30 2003-01-30 Procede et circuit pour la determination de la longueur d'onde, et appareil fonctionnant selon ce procede et comprenant ce circuit WO2004068093A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2003/000921 WO2004068093A1 (fr) 2003-01-30 2003-01-30 Procede et circuit pour la determination de la longueur d'onde, et appareil fonctionnant selon ce procede et comprenant ce circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2003/000921 WO2004068093A1 (fr) 2003-01-30 2003-01-30 Procede et circuit pour la determination de la longueur d'onde, et appareil fonctionnant selon ce procede et comprenant ce circuit

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WO2004068093A1 true WO2004068093A1 (fr) 2004-08-12

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6418284A (en) * 1987-07-13 1989-01-23 Nec Corp Method and equipment for stabilizing oscillation frequency intervals of plural laser devices
JPH03115939A (ja) * 1989-09-29 1991-05-16 Anritsu Corp 光スペクトラム分析装置
JPH0755579A (ja) * 1993-08-09 1995-03-03 Nippon Telegr & Teleph Corp <Ntt> 光スペクトラムアナライザ
JPH1065649A (ja) * 1996-08-26 1998-03-06 Nec Corp 波長多重光送信装置
JPH1114463A (ja) * 1997-06-25 1999-01-22 Tokyo Electric Power Co Inc:The 光波長計測装置
JPH11196068A (ja) * 1998-01-05 1999-07-21 Nec Corp 波長分割多重送信装置
JP2000115132A (ja) * 1998-09-30 2000-04-21 Nec Corp 光波長多重送信器及び送信方法、光波長多重受信器及び受信方法、および光波長多重伝送装置
JP2001077754A (ja) * 1999-09-01 2001-03-23 Fujitsu Ltd 光分岐装置および光分岐・挿入装置
JP2002232075A (ja) * 2001-01-31 2002-08-16 Ando Electric Co Ltd 波長可変光源

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6418284A (en) * 1987-07-13 1989-01-23 Nec Corp Method and equipment for stabilizing oscillation frequency intervals of plural laser devices
JPH03115939A (ja) * 1989-09-29 1991-05-16 Anritsu Corp 光スペクトラム分析装置
JPH0755579A (ja) * 1993-08-09 1995-03-03 Nippon Telegr & Teleph Corp <Ntt> 光スペクトラムアナライザ
JPH1065649A (ja) * 1996-08-26 1998-03-06 Nec Corp 波長多重光送信装置
JPH1114463A (ja) * 1997-06-25 1999-01-22 Tokyo Electric Power Co Inc:The 光波長計測装置
JPH11196068A (ja) * 1998-01-05 1999-07-21 Nec Corp 波長分割多重送信装置
JP2000115132A (ja) * 1998-09-30 2000-04-21 Nec Corp 光波長多重送信器及び送信方法、光波長多重受信器及び受信方法、および光波長多重伝送装置
JP2001077754A (ja) * 1999-09-01 2001-03-23 Fujitsu Ltd 光分岐装置および光分岐・挿入装置
JP2002232075A (ja) * 2001-01-31 2002-08-16 Ando Electric Co Ltd 波長可変光源

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