WO2004040719A1 - 光増幅器の制御装置及び制御方法 - Google Patents
光増幅器の制御装置及び制御方法 Download PDFInfo
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- WO2004040719A1 WO2004040719A1 PCT/JP2002/011447 JP0211447W WO2004040719A1 WO 2004040719 A1 WO2004040719 A1 WO 2004040719A1 JP 0211447 W JP0211447 W JP 0211447W WO 2004040719 A1 WO2004040719 A1 WO 2004040719A1
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- 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
- H04B10/294—Signal power control in a multiwavelength system, e.g. gain equalisation
- H04B10/296—Transient power control, e.g. due to channel add/drop or rapid fluctuations in the input power
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06754—Fibre amplifiers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
- H01S3/1301—Stabilisation of laser output parameters, e.g. frequency or amplitude in optical amplifiers
- H01S3/13013—Stabilisation of laser output parameters, e.g. frequency or amplitude in optical amplifiers by controlling the optical pumping
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- 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
- H04B10/2931—Signal power control using AGC
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S2301/00—Functional characteristics
- H01S2301/04—Gain spectral shaping, flattening
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/094003—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light the pumped medium being a fibre
- H01S3/094011—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light the pumped medium being a fibre with bidirectional pumping, i.e. with injection of the pump light from both two ends of the fibre
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/0941—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode
- H01S3/09415—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode the pumping beam being parallel to the lasing mode of the pumped medium, e.g. end-pumping
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10007—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers
- H01S3/10015—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers by monitoring or controlling, e.g. attenuating, the input signal
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10069—Memorized or pre-programmed characteristics, e.g. look-up table [LUT]
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
- H01S3/1305—Feedback control systems
Definitions
- the present invention relates to a control device and a control method for an optical amplifier used in an optical communication system such as a wavelength division multiplexing optical transmission system.
- long-distance transmission is realized by providing optical amplifiers at predetermined intervals. For example, an optical transmission across the Pacific
- optical amplifiers use an optical fiber doped with rare earth ions such as erbium (Er) ⁇ praseodymium (Pr) and thulium (Tm) as an amplification medium.
- Erbium ion-doped optical fibers EDFs, which provide gain and a wide band, are often used.
- OADM optical add-drop multiplex
- the output light power of the optical amplifier is monitored, and the amplification gain (actually, for example, the pump light power) of the optical amplifier is controlled based on the monitored value so that the output light power of the optical amplifier becomes constant. Is done.
- the AGC of the optical amplifier be capable of quickly controlling the output optical power in a short time by following the change of the input optical power at high speed.
- the response speed of the AGC is unlimitedly increased, an oscillation phenomenon may occur.
- Patent Document 1 Japanese Patent Application Laid-Open No. 9-200145
- Patent Document 2 Japanese Patent Application Laid-Open No. 7-221737
- an optical signal to be amplified is configured to be input to an optical amplifier (EDF) via an optical fiber having a predetermined delay time, and a signal is input to an input end of the optical fiber.
- the supply of the pump light is started from the time when the arrival of the light is detected to the time when the signal light reaches the EDF (for example, paragraph [0 034;] of Patent Document 1) to [0 0 3 9]).
- Patent Document 1 since an extra optical fiber is provided for delaying the signal light input to the optical amplifier, the characteristics of the optical fiber are inferior. This results in a dangling. Further, the technique described in Patent Document 2 requires high-speed control of the adjustment light, and also results in an increase in power consumption and heat generation of the optical amplifier due to the adjustment light output.
- the present invention has been made in view of the above-described problems, and does not cause an oscillation phenomenon, an increase in the size of an optical amplifier, power consumption, and an increase in heat generation in a change in input power of signal light. It is an object of the present invention to provide a control device and a control method for an optical amplifier, which can follow at high speed. Disclosure of the invention
- a control device and a control method for an optical amplifier according to the present invention include the following units.
- First control means for controlling the gain of an optical amplifier based on input optical power and output optical power of the optical amplifier
- the control means includes a gain control amount calculator for obtaining a difference from a target gain of the optical amplifier based on the input light power and the output light power, and obtaining the gain control amount based on the difference.
- the gain control variable means may include a coefficient controller that changes a coefficient for the difference according to at least one of the input light power and the output light power.
- the first control means calculates a difference from a target gain of the optical amplifier based on the input light power and the output light power, and calculates the difference based on the difference and an integrated value of the difference.
- a gain control amount calculator for obtaining a gain control amount is provided, and the gain control amount varying means calculates a coefficient corresponding to the difference between the input light power and the output light power.
- a coefficient controller that changes according to at least one of them may be provided.
- the first control means obtains a difference from a target gain of the optical amplifier based on the input light power and the output light power, and calculates the difference based on the difference and an integrated value of the difference.
- a gain control amount calculator for obtaining a gain control amount is provided, and the gain control amount varying means includes a coefficient for the difference and a coefficient for the integral value, at least one of the input light power and the output light power. It may be configured to include a coefficient controller that changes according to either of them.
- control device of the present optical amplifier further comprises second control means for feed-forward controlling the gain of the optical amplifier based on the input optical power, wherein the first control means and the second control means are provided.
- the gain of the optical amplifier may be controlled in combination with the means.
- a control device for an optical amplifier is a control device for an optical amplifier having a first pumping light source and a second pumping light source, based on an input light power and an output light power of the optical amplifier.
- a control means for obtaining a difference from the target gain of the optical amplifier and controlling the gain of the optical amplifier based on the difference is provided.
- the control means obtains the pump light power expected from the first pump light source.
- the second pumping light source determines a gain control amount for compensating for the shortage
- the first control unit calculates a gain control amount calculated by the shortage determination unit. It is characterized in that a converter is provided which performs conversion so that the coefficient for the difference does not change when the pumping light power expected of the pumping light source is sufficient or not.
- the method for controlling an optical amplifier according to the present invention includes: (1) obtaining a gain control amount when controlling the gain of the optical amplifier based on input optical power and output optical power of the optical amplifier; The gain control amount is changed according to at least one of the input optical power and the output optical power. .
- a control method for an optical amplifier is a control method for an optical amplifier having a first pumping light source and a second pumping light source, based on an input optical power and an output optical power of the optical amplifier. Calculating the difference from the target gain of the optical amplifier, and controlling the gain of the optical amplifier based on the difference. (1) When the pump light expected from the first pump light source cannot be obtained, A gain control amount for compensating for the shortage in the second pump light source, and (2) when the pump light power expected from the first pump light source is sufficient for the gain control amount. The conversion is performed such that the coefficient for the difference does not change when the difference is not enough.
- FIG. 1 is a block diagram showing a configuration of a main part of the optical amplifier according to the first embodiment of the present invention.
- FIG. 2 is a block diagram showing the configuration of the control unit shown in FIG.
- FIG. 3 is a diagram showing a relationship between a required feedback coefficient and a convergence limit with respect to input optical power according to the present embodiment.
- FIG. 4 is a block diagram showing a configuration of a feedback control unit and a feedback pack coefficient control unit shown in FIG. ⁇
- FIG. 5 is a block diagram showing a first modification of the feedback control unit and the feedback pack coefficient control unit shown in FIG.
- FIG. 6 is a block diagram showing a second modification of the feed pack control unit and the feed pack coefficient control unit shown in FIG.
- FIG. 7 is a block diagram illustrating a configuration of a control unit of the optical amplifier according to the second embodiment of the present invention.
- FIG. 8 is a block diagram showing a configuration of the feed pack control unit, the feed pack coefficient control unit, and the feed feed control unit shown in FIG.
- FIG. 9 is a block diagram showing a first modification of the feed pack control unit, feed pack coefficient control unit, and feed feed control unit shown in FIG.
- FIG. 10 is a block diagram showing a second modification of the feed pack control unit, feed pack coefficient control unit, and feed feed control unit shown in FIG.
- FIG. 11 is a block diagram showing a configuration of a main part of an optical amplifier according to a third embodiment of the present invention.
- FIG. 12 is a block diagram showing the configuration of the control unit shown in FIG.
- FIG. 13 is a block diagram showing a modified example of the control unit shown in FIG.
- FIG. 14 is a diagram showing the relationship between the pumping light control value and the pumping light power in order to explain the pumping light power control (without correction).
- FIG. 15 is a diagram illustrating the relationship between the pump light control value and the pump light power in order to explain the pump light power control (with correction) by the control unit shown in FIG. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 is a block diagram showing a configuration of a main part of an optical amplifier according to a first embodiment of the present invention.
- the optical amplifier 1 shown in FIG. 1 includes optical demultiplexers 2, 3, 6 and an erbium-doped optical fiber ( EDF) 4, gain equalizer 5, optical sensors 7 and 9, excitation light source 8, and control unit (control device) 10.
- EDF erbium-doped optical fiber
- the optical demultiplexer 2 splits a part of the WDM signal light (main signal light) received from the optical transmission line 20 and outputs one to the EDF 4 side and the other to a power monitor.
- the optical demultiplexer 3 outputs the light to the optical sensor 7 as moyuta light.
- the optical demultiplexer 3 combines the main signal light from the optical demultiplexer 2 with the pump light (pump light) supplied from the pump light source 8. Things.
- the EDF 4 amplifies the main signal from the optical multiplexer 3 with the pump light.
- the gain equalizer 5 determines the gain of the amplified output of the EDF 4 by the gain of each wavelength of the main signal light.
- the optical demultiplexer 6 branches a part of the equalized output of the gain equalizer 5 and outputs one to the optical transmission line 30 on the output side. The other is output to the optical sensor 9 as monitor light for power monitoring.
- the optical sensor 7 receives the monitor light branched by the optical splitter 2, and receives the received monitor light.
- the optical sensor 9 receives the monitor light branched by the optical demultiplexer 6 and generates an electric signal corresponding to the amount of light (power). It generates signals, and each is composed of, for example, a photodiode (PD). That is, the optical sensor 7 functions as an input light measuring unit that measures the input optical power of the EDF 4 that functions as an optical amplifier, and the optical sensor 9 functions as an output light measuring unit that measures the output optical power of the EDF 4 It is.
- PD photodiode
- the pumping light source 8 is for generating pumping light for the EDF 4, and is composed of, for example, a laser diode (LD).
- LD laser diode
- control unit 10 controls the pumping light power of the pumping light source 8 based on the power measurement results (input optical power and output optical power) by the optical sensors 7 and 9 described above, and adjusts the gain of the EDF 4.
- This is for constant gain control (AGC: Automatic Gain Control), but in this embodiment, the response speed of AGC control is improved compared to the conventional one so that it can sufficiently follow sudden changes in input optical power. Something has been done to do that.
- the control unit 10 of the present embodiment includes, for example, a feed pack control unit 11 and a feed pack coefficient control unit 12 as shown in FIG.
- the feed-pack control unit (first control means) 11 calculates the gain of the EDF 4 based on the input optical power and the output optical power monitored by the optical sensors 7 and 9, respectively.
- control amount is calculated by the following formula (1).
- LD 0Ul ax (P in xG-P 0Ul )-(l)
- feed pack controller 1 for example, as shown in FIG. 4, a multiplier 1 1-3 for multiplying and the target gain G input optical path Wa P in, output light power P. from the multiplication result It is composed of a subtractor 1 1-2 for subtracting ut to obtain a difference, and a multiplier 11-13 for multiplying the obtained difference by a feedback coefficient a to obtain an excitation light control value.
- these multipliers 1 1-1, subtractor 11-2 and multiplier 11-3 provide the difference from the target gain G of the optical amplifier 1 based on the input optical power and the output optical power of the optical amplifier 1.
- Input optical power P in X target gain G—output optical power P. ut ) and it functions as a gain control amount calculator that calculates the gain control amount based on the difference.
- the coefficient (feedpack coefficient) a in the above equation (1) may be increased.
- this coefficient a is increased without limit, the EDF 4 Output oscillates and does not converge.
- EDFs which are often used as optical amplifiers, tend to oscillate due to their characteristics, and cannot have a large feedback coefficient a enough to follow a sudden change in input optical power. .
- Fig. 3 shows the relationship between the input optical power and the coefficient a (a convergence limit) a that oscillates and a coefficient a that ensures sufficient performance (high-speed response performance). As shown in FIG. 3, it can be seen that oscillation is difficult where the coefficient a needs to be increased.
- the feed packs coefficient control unit (gain control amount varying means) 12, and controls (variable) in accordance with the input light power P in which the monitored feed pack coefficient a by the optical sensor 7.
- control is performed by a function fi (function calculator 12-1) of a necessary feedback coefficient a shown in FIG.
- the function fi of the necessary feedback coefficient a shown in FIG. 3 can be represented by, for example, the following equation (2).
- Equation (2) “b” is a constant from 0 to less than 1, which depends on how fast response performance is required.
- the “convergence limit” can be expressed by the following equation (3) when, for example, EDF4 has a gain of about 20 dB.
- the optical amplifier 1 of this embodiment the input optical power P in the optical amplifier 1 (EDF 4) and the output optical power P out is measured in the optical sensor 7, 9, respectively, feed the pack controller 1 In 1, a difference from the target gain G (input optical power P in X target gain G—one output optical power P. ut ) is subtracted by the subtracter 1 1 based on the measured input optical power P in and output optical power P in. ⁇ 2, and the obtained difference is multiplied by a feed-pack coefficient a in a multiplier 11 3 to obtain an excitation light control value.
- the target gain G input optical power P in X target gain G—one output optical power P. ut
- the feed pack coefficient a is variable in accordance with the input light power P in the feed pack coefficient control section 1 2 (function, it requires sufficient value in the "convergence limit", produce oscillation phenomenon It is possible to increase the speed of the AGC of the EDF 4.
- the feedforward control is also performed by the feedforward control unit 13, a higher-speed AGC can be realized. Therefore, it is possible to quickly follow the fluctuation of the input power of the signal light to the optical amplifier 1 used in the WDM transmission system without causing oscillation phenomenon, enlargement of the optical amplifier, increase in power consumption and heat generation, and It is possible to suppress fluctuations in the output power of the optical amplifier 1. Specifically, when the number of wavelengths (channels) used as signal light fluctuates, In addition, the output power fluctuation of each signal light can be reduced, and as a result, a more stable WDM optical communication than before can be realized.
- FIG. 5 shows the control unit 10 (feed pack control unit 11 and feed pack
- FIG. 5 is a block diagram showing a first modified example of the number control unit 13).
- the feed-pack control unit 11 is different from the configuration shown in FIG. The difference is that an integrator 1 1-4, a multiplier 1 1-5, and an adder 1 1-6 are further provided in addition to 1 1 1 3 and the subtracter 1 1-2.
- the other constituent elements (those having the same reference numerals as those described above) are the same as or similar to those described above unless otherwise specified, and are the same in the following modifications.
- the integrator 1 1-4 integrates the difference obtained by the subtractor 1 1-2, and the multiplier 1 1-1 5 calculates the difference obtained by the integrator 1 1-4. Is multiplied by a predetermined coefficient.
- the adder 11-6 adds the multiplication result of the multiplier 15 and the multiplication result of the multiplier 11-3 to generate an excitation. The light control value is determined.
- the components 1 1 one 1-1 1 one 6 feed the pack controller 1 1 of the present embodiment, from the target gain G based on the input light power P in the optical amplifier 1 and the output light power P out
- a difference input optical power P in X target gain G—output optical power P. ut
- a gain control amount calculator for obtaining a gain control amount of the optical amplifier 1 based on the difference and an integrated value of the difference. It works.
- FIG. 6 is a block diagram showing a second modification of the above-described control unit 10 (feed pack control unit 11 and feed pack coefficient control unit 13).
- the configuration shown in FIG. 6 the configuration shown in FIG.
- the function f 2 (function operator 1 2-2) is provided in addition to the function (function operator 1 2-1), and the output of the function f 2 Is configured to be multiplied by the output of the integrator 11 to 14 by the multiplier 11-5 of the feed pack control unit 11.
- the above-mentioned function f 2 is a function that differs only in the value of “C” in the above-mentioned function (depending on EDF characteristics, gain, amplifier configuration, and the like).
- the feedback control unit 11 not only the difference obtained by the subtracter 1 1-2 but also the coefficient multiplied by the integrated value of the difference obtained by the integrator 1 1-4 Is also varied according to the input light power Pin by the function f2.
- FIG. 7 is a block diagram showing a configuration of a control unit of the optical amplifier according to the second embodiment of the present invention.
- the control unit 10 shown in FIG. 7 is different from the one shown in FIG. The difference is that a part 13 and an adder 14 are further provided.
- the feedforward control unit (second control means) 13 is a control amount (excitation light) for performing the feedforward control of the excitation light power according to the input light power Pin monitored by the optical sensor 7.
- the power U calculator 14 adds the pumping light control values calculated by the control units 11 and 13 and supplies the sum to the pumping light source 8 as a pumping light control signal. It is.
- the feed pack control unit 11 uses the same multipliers 11 1—1, 1 1 1 3 and subtracter 1 1 1 2 as those already described.
- the feed-pack coefficient controller 12 is provided with the same function (function calculator 12-1) as described above, and the feed-forward controller 13 is provided with a feed-forward controller. It is configured with a function f 3 (function operator 13-1). Note that the feedforward function f 3 may be a function used for known feedforward control.
- control unit 10 of the present embodiment is configured to control the gain of the optical amplifier 1 by a combination of the feedpack control unit 11 and the feedforward control unit 13.
- the AGC of the optical amplifier 1 can be further speeded up without causing an oscillation phenomenon, as compared with the first embodiment.
- the feed pack control unit 11 is also configured as shown in FIGS. 9 and 10, for example, as shown in FIGS.
- the integrated value of the difference obtained by the subtractor 1 1 and 1 2 may be used for feed pack control, or the integrated value may be multiplied in a powerful configuration. Coefficients may be configured to be variable by the function f 2 also. In any case, the AGC of the optical amplifier 1 can be performed more stably and at a higher speed.
- FIG. 11 is a block diagram showing a configuration of a main part of an optical amplifier according to a third embodiment of the present invention.
- the optical amplifier 1 shown in FIG. 11 has a plurality (here, 2) pump light sources 8-1 and 8-2 are provided, and an optical multiplexer 3 'for inputting the pump light generated by the pump light source 8-2 to the EDF 4 from behind the EDF 4 is used as an EDF. The difference is that it is provided between 4 and the gain equalizer 5.
- the control unit 10 in this case also has a feed pack control unit 11 and a feed pack coefficient control unit 12 similar to those shown in FIG. 2, but in this case, the feed pack control unit 11
- a function f 4 current value calculator 11 A-7
- a function f 5 current value calculator 11 B-7
- a function fc conversion calculator 11 B-8
- Limiters 11A-8, 11B-9 Limiters 11A-8, 11B-9.
- the multiplier 11-1, the subtractor 11-2, the multiplier 11-13, and the function are the same as or similar to those described above.
- the above function f 4 calculates one (first) pump light source 8-1 from the pump light control value obtained by the multiplier 11-13 as described above. It is intended to determine a current value for driving dynamic, limiter 11 A- 8 is the allowable range (maximum value when the current value obtained by the function f 4 exceeds the allowable range of the excitation light source 8 Below).
- the limiter 11A-8 when the current value obtained by the function f4 exceeds the allowable range, the limiter 11A-8 is used to calculate the current value obtained by subtracting the maximum value from the current value to be output. Is supplied to the function fc (conversion calculator 11B-8) as a current value corresponding to the shortage of the pumping light power by one of the pumping light sources 8-1 (hereinafter, referred to as an undercurrent value). In other words, this limiter 11A-8 finds the gain control amount for compensating for the shortage in the other pumping light sources 8-2 when the expected pumping light power cannot be obtained in the pumping light source 8-1. It functions as a shortage determination unit.
- the above function f 5 (current value calculator 11b- 7), similar to the function f 4, above Is for determining a current value for driving the other of the excitation light source 8 2 from the excitation light control value, the function fc [transform operator (converting unit) 1 1 B- 8] is this function f 4
- the shortage of the pumping light power by one pumping light source 8-1 is compensated by the pumping light power of the other pumping light source 8-2.
- the above-mentioned undercurrent value is to be corrected (converted) so that the feedback coefficient a for both excitation light sources 8-1, 8-2 does not change.
- the output (current value) 1 3 of the function fc (transform operator 1 1 B- 8) is the output of the function f 5 equal to 1 2 I 1 shortage current, for example, the following formula ( It is expressed by 5).
- the equation (5) is, when there is no shortage of current value becomes current value is the drive current value of the left pumping light source 8 2 obtained by the function f 5, otherwise determined by the function f 5 current This means that the value obtained by adding the undercurrent value corrected so that the feedback coefficient a does not change to the value is the drive current value of the excitation light source 8-2.
- “d” in this equation (5) is selected so that the feed-pack coefficient a is the same between “State 1” and “State 2” shown in FIGS. 14 and 15 (simple measurement by actual measurement). Can be). In this way, the oscillation limit can be made the same between "State 1" and "State 2".
- FIG. 14 shows that the maximum output of the pump light source 8-1 and the pump light source 8-2 are the same, and that the output power (pump light power) of the pump light source 8-1 and the pump light source 8-2 is 2: 1.
- each of the pumping light powers represented by the solid lines 20 and 21 is linearly increased as the pumping light control value increases.
- the pump light sources 8-1 Pump light power (drive current value) is maintained at the maximum value by the limiter 11A-8, and the pump light power of the other pump light source 8-2 indicated by the solid line 21 reaches the maximum value until it reaches the maximum value. It can be seen that it increases linearly with the same slope as.
- the excitation light source 8 _ has a larger slope than the slope in the “state 1”. It can be seen that the pump light power of pump light source 8-2 is increased and the shortage of the pump light power of pump light source 8-1 is compensated for by the pump light power of pump light source 8-2.
- the limiter 11B-9 shown in Fig. 12 is similar to the limiter 11A-8 described above, when the output (current value) of this function fc exceeds the allowable range of the excitation light source 8-2. In this case, it is intended to keep it within the permissible range (below the maximum value).
- the control unit 10 feed pack control unit 11 of the present embodiment operates until the pump light power of the pump light source 8-1 reaches the maximum value (“state 1” shown in FIG. 15).
- the pump light power of both pump light sources 8-1, 8-2 was varied according to the input light power by the respective functions as shown by the solid lines 20 and 21 in Fig. 15. It is controlled based on the excitation light control value (output of the multiplier 111) obtained using the feedback coefficient a.
- the pumping light power of the pumping light source 8-1 reaches the maximum value (during “State 2” shown in Fig. 15)
- the pumping light power of the pumping light source 8-1 is maintained at the maximum value. is, by being added to the current value calculated by the function f 5 with insufficient in this period fraction (under current value determined by the limiter 1 1 A- 8) is Tadashisa auxiliary function fc, the excitation light source 8
- the pump light power of No. 2 has the same feed-pack coefficient a in “State 1” and “State 2”, and the shortage due to the pump light source 8-1 Increase to make up.
- a plurality of pump light sources 8-1, 8-2 are used in the optical amplifier 1, and when one pump light source 8-1 runs short of pump light power, the other pump light sources 8-1, 8-2 are used. Even when the shortage is compensated for by the excitation light power of 8-2, it is possible to perform a stable AGC without causing an oscillation phenomenon by making it seemingly different in the oscillation limit.
- control unit 10 (common to the pump light sources 8-1 and 8-2)
- the pack control unit 1 1) changes the feed pack coefficient a according to the input optical power, so there is no need to provide a separate control unit for each of the pump light sources 8 _ 1 and 8-2, and low cost and high speed AGC can be realized.
- the pumping light power of the pumping light source 8-1 when the pumping light power of the pumping light source 8-1 is insufficient, the shortage is compensated for by the pumping light power of the excitation light 8-2. The same applies when the power of the pumping light source 8-1 is used to make up for the shortage when the power of the pumping light source 8-2 is insufficient.
- the excitation light sources 8-1, 8-2 are arranged on the input / output side of the EDF so as to sandwich the EDF 4, but are arranged on only one of the input side and the output side. You may. Furthermore, the number of excitation light sources is not limited to two, but may be three or more.
- the feedback control unit 11 performs control using the difference or the difference and its integral value.
- the control using a combination of these and the differential value of the difference is performed. You can also do so.
- the configuration in which the feed-pack coefficient a in the feedback control unit 11 is made variable according to the input optical power of the optical amplifier 1 has been described.
- the gain control amount when controlling the gain of an optical amplifier, the gain control amount can be controlled according to at least one of the input optical power and the output optical power of the optical amplifier. Therefore, it is possible to follow the input power fluctuation of the signal light at high speed without causing oscillation phenomenon, enlargement of the optical amplifier, increase of power consumption and heat generation, and realize stable optical communication. . Therefore, its usefulness in the optical communication field is considered to be extremely high.
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Lasers (AREA)
- Optical Communication System (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP02779992A EP1557916A4 (en) | 2002-11-01 | 2002-11-01 | OPTICAL AMPLIFIER CONTROL DEVICE AND CONTROL METHOD |
PCT/JP2002/011447 WO2004040719A1 (ja) | 2002-11-01 | 2002-11-01 | 光増幅器の制御装置及び制御方法 |
JP2004548005A JP4603361B2 (ja) | 2002-11-01 | 2002-11-01 | 光増幅器の制御装置 |
US11/008,963 US7158290B2 (en) | 2002-11-01 | 2004-12-13 | Controlling apparatus for optical amplifier and controlling method thereof |
US11/605,275 US7388711B2 (en) | 2002-11-01 | 2006-11-29 | Controlling apparatus for optical amplifier and controlling method thereof |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2002/011447 WO2004040719A1 (ja) | 2002-11-01 | 2002-11-01 | 光増幅器の制御装置及び制御方法 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/008,963 Continuation US7158290B2 (en) | 2002-11-01 | 2004-12-13 | Controlling apparatus for optical amplifier and controlling method thereof |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004040719A1 true WO2004040719A1 (ja) | 2004-05-13 |
Family
ID=32260031
Family Applications (1)
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---|---|---|---|
PCT/JP2002/011447 WO2004040719A1 (ja) | 2002-11-01 | 2002-11-01 | 光増幅器の制御装置及び制御方法 |
Country Status (4)
Country | Link |
---|---|
US (2) | US7158290B2 (ja) |
EP (1) | EP1557916A4 (ja) |
JP (1) | JP4603361B2 (ja) |
WO (1) | WO2004040719A1 (ja) |
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JP2007035961A (ja) * | 2005-07-27 | 2007-02-08 | Sumitomo Electric Ind Ltd | 光増幅装置およびその制御方法 |
JP2007180409A (ja) * | 2005-12-28 | 2007-07-12 | Furukawa Electric Co Ltd:The | 光増幅方法および光増幅装置 |
US7457549B2 (en) * | 2005-05-13 | 2008-11-25 | Fujitsu Limited | Sub signal modulation apparatus, sub signal demodulation apparatus, and sub signal modulation demodulation system |
US7511883B2 (en) | 2003-02-12 | 2009-03-31 | The Furukawa Electric Co., Ltd. | Optical amplifying method, optical amplifying apparatus, and optical amplified transmission system using the apparatus |
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JP3914236B2 (ja) * | 2003-01-30 | 2007-05-16 | 富士通株式会社 | 光増幅器 |
DE10358698B4 (de) * | 2003-12-15 | 2015-10-22 | Xieon Networks S.À.R.L. | Verfahren zur Regelung der Pumpleistung eines optischen Verstärkers |
US8174759B2 (en) * | 2008-06-19 | 2012-05-08 | Srikanth Ramakrishnan | Apparatus for gain control in optical amplifiers |
CN104466681B (zh) * | 2014-11-25 | 2018-12-25 | 武汉光迅科技股份有限公司 | 一种光纤放大器的串级控制系统 |
US20240114270A1 (en) * | 2022-09-30 | 2024-04-04 | Huawei Technologies Co., Ltd. | Assemblies and methods for managing spectral hole burning |
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Also Published As
Publication number | Publication date |
---|---|
JPWO2004040719A1 (ja) | 2006-03-02 |
US20070070492A1 (en) | 2007-03-29 |
EP1557916A4 (en) | 2009-12-16 |
US7158290B2 (en) | 2007-01-02 |
US7388711B2 (en) | 2008-06-17 |
EP1557916A1 (en) | 2005-07-27 |
JP4603361B2 (ja) | 2010-12-22 |
US20050116147A1 (en) | 2005-06-02 |
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