CN1131458C - Optical amplifier for constantly adjusting per-channel output power and method thereof - Google Patents
Optical amplifier for constantly adjusting per-channel output power and method thereof Download PDFInfo
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- CN1131458C CN1131458C CN99100602A CN99100602A CN1131458C CN 1131458 C CN1131458 C CN 1131458C CN 99100602 A CN99100602 A CN 99100602A CN 99100602 A CN99100602 A CN 99100602A CN 1131458 C CN1131458 C CN 1131458C
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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
- H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
- H01S3/0064—Anti-reflection devices, e.g. optical isolaters
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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
- 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
- H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
- H01S3/16—Solid materials
- H01S3/1601—Solid materials characterised by an active (lasing) ion
- H01S3/1603—Solid materials characterised by an active (lasing) ion rare earth
- H01S3/1608—Solid materials characterised by an active (lasing) ion rare earth erbium
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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
- H04B10/2912—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form characterised by the medium used for amplification or processing
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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
- H04B10/2942—Signal power control in a multiwavelength system, e.g. gain equalisation using automatic gain control [AGC]
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- 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
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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
- H01S3/09—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
- H01S3/10—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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- Physics & Mathematics (AREA)
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
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- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
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Abstract
An optical amplifier includes a channel monitor section, an amplifier section, an amplifier control section, and a wavelength coupling section. The gain of the optical amplifier is controlled so that a target value of the amplified data channel optical signal corresponding to the number of channels becomes actually equal to a measured value. Thus, the output power for each channel can be constantly controlled.
Description
What the present invention relates to is image intensifer and its implementation that is used for the output power of each channel is continued adjustment, and especially the output power of each channel that uses in wavelength division multiplex transmission (WDM) system is image intensifer and its implementation of steady state value.
Exploitation as the image intensifer (EDFA) of the er-doped fiber of the nineties fiber optics has realized the epoch-making progress in light transmission field.Be accompanied by wdm system, WSN-EDFA also is developed success, and except that single channel, this amplifier can carry out the light transmission of 4 to 16 channels simultaneously.
The amplification of the gain compensation image intensifer that uses in the WDM transmission system is along with the variation of the intensity of the variation of channel quantity or input signal and change.The variation that this signal that produces along with wavelength change amplifies has reduced the equilibrium degree of gain, and make system produce mistake, thereby be harmful to for long-distance transmissions, in the WDM transmission system that adopts EDFA, importantly to the output power of each channel be controlled according to the quantity of channel, because changing will appear in the quantity of channel when the networking reconfigures or break down, and cause the variation of EDFA output power value.In other words, amplify because WDM-EDFA must carry out equivalence to the light signal of each channel, therefore, the signal of each wavelength all will obtain impartial gain.That is to say that the gain of WDM-EDFA must be controlled, when its quantity at channel is changed and unlikely appearance fluctuation.
The dynamic gain control Erbium-Doped Fiber Amplifier (EDFA) transponder of being revealed in " OFC ' 97 technical literature) " by C.Konish etc. that is used for the WDM network allows the signal of amplifier output constant intensity.Fig. 1 is the sketch of a common EDFA, comprises an amplifying unit 10, the first and second coupling mechanisms 12 and 14, wavelength monitoring unit 16 and a gain control unit 18.First and second coupling mechanisms 12 and 14 part output signals with amplifying unit are transferred to wavelength monitoring unit 16.Wavelength monitoring unit 16 receives and monitoring exporting through amplifying signal from second coupling mechanism 14.Gain control unit 18 is according to the gain of monitoring result control amplifying unit 10.Wavelength monitoring unit 16 comprises an acousto-optic tunable filter (AOTF), a photodiode (PD) and a wavelength counter, and the channel of the light signal that amplified via amplifying unit counted.Gain control unit 18 uses the mode of a PD or gain compensator gain by adjusting amplifying unit to control the intensity of output signal.
Yet this traditional structure is very complicated, and volume is big, uses a plurality of optical device, thereby uses in real system and also have any problem.And this EDFA directly tells a light signal through amplifying on delivery outlet, thereby the output of EDFA is had a direct impact.
For addressing the above problem, the invention provides the image intensifer that the power of a channel quantity and light signal is detected, and the output power of its each channel can be subjected to Sustainable Control according to the mode of the quantity of passage and the power input gain by adjusting EDFA, and its implementation.
Therefore, for achieving the above object, this invention provides an image intensifer, and the output power of its each channel is subjected to Sustainable Control.When supervisory channel light signal and data channel signal with a plurality of channels were imported simultaneously, this image intensifer was used for the light signal of amplification data channel.This image intensifer comprises: a channel monitoring unit, be used to isolate the supervisory channel light signal, and the supervisory channel light signal is converted to electric signal, from signal, isolate the channel quantity that comprises data channel, and output is through the signal of conversion through conversion; An amplifying unit comes the amplification data channel optical signal with predetermined drive source; One is amplified control module, is used for the input in controlling and driving source, so that make the target output value of the amplifying unit that is determined by channel quantity equal the output power value that measures of amplifying unit actually; A wavelength coupling unit is used for converting the output signal of channel monitoring unit to light signal, and the data channel light signal that light signal and process are amplified is coupled.
For achieving the above object, this invention provides the output power method of each channel of Sustainable Control image intensifer, may further comprise the steps: (a) output power of measuring light amplifier when the channel quantity of data channel light signal changes, and when the power of each channel of the image intensifer that is used to amplify the data channel light signal with a plurality of channels is subjected to Sustainable Control, store with channel quantity with by the output power value of channel quantity decision; (b) judge the variation of the channel quantity of the data channel light signal that comprises input optical signal by measuring the power of importing the data channel light signal, and channel quantity is separated from the data channel light signal; (c) in step (a), in the output power value of storage an output power value corresponding to the image intensifer of isolated channel quantity is being set as desired value.(d) measurement is by the output power of the input signal light of image intensifer amplification; (e) gain of adjustment image intensifer is so that the value of measuring equates with desired value actually.
With reference to accompanying drawing, by the detailed description to selected example, the above-mentioned purpose and the superiority of this invention will be more obvious, in the accompanying drawing:
Fig. 1 is for describing the block scheme of a traditional optical amplifier structure;
Fig. 2 is for describing one according to block diagram of the output power of each channel being carried out the image intensifer of Sustainable Control of the present invention;
Fig. 3 is a process flow diagram, and it has described the method for the output power of each channel of an image intensifer of the present invention being carried out Sustainable Control;
Fig. 4 A and 4B have described when the light signal of four channels is imported image intensifer of the present invention the output signal situation of each channel; And
Fig. 5 A and 5B have showed when 4 channel optical signal are exported image intensifer of the present invention the situation of the output signal of each channel.
Referring to Fig. 2, be an image intensifer, comprise a channel monitoring unit 200, first photo-coupler 210, first photodiode (PD) 211, the first isolators 220, amplifying unit 230, amplify control module 240,260, the second photodiode PD261 of 250, the second photo-couplers of second isolator, external control unit 270 and wavelength coupling unit 280.
When a data channel light signal and the supervisory channel light signal that is used for the Monitoring Data channel are coupled mutually and receive as input signal mutually, channel monitoring unit 200 is with the decoupling of supervisory channel light signal, thus, the information of relevant channel quantity is separated.Channel monitoring unit 200 comprises first wavelength selective coupler (WSC) 201, photoelectric commutator 202 and system control unit 203.First wavelength selective coupler WSC201 will be from the supervisory channel light signal decoupling of input optical signal.Photoelectric conversion unit converts the supervisory channel light signal of decoupling to electric signal.System control unit 203 is separated the information that is input to the relevant channel quantity of image intensifer from the supervisory channel electric signal.Simultaneously, system control unit 203 appends to the supervisory channel electric signal to the information of the magnifying state of the relevant amplifying unit 230 that amplifies control modules 240 outputs and gets on.
Drive source of amplifying unit 230 usefulness amplifies the data channel light signal.Amplifying unit 230 comprises second WSC231,233, the three WSC234 of Er-doped fiber (EDF) and as first, second pump light source 232 and 235 of the amplification drive source of EDF233.Second WSC231 be the pump light and the coupling of data channel light signal of first pump light source 232, and the 3rd WSC234 outputs to EDF233 with the pump light of second pump light source 235.
Wavelength coupling unit 280 becomes light signal with the output supervisory channel electrical signal conversion of system control unit 203, this through the light signal of conversion and the data channel light signal coupling of amplifying through amplifying unit 230, is sent to the next signal interface with this composite signal again.Wavelength coupling unit 280 comprises the 4th WSC281 and electricity one photoconverter 282.Electricity one photoconverter 282 converts the system monitoring channel electrical signal of system control unit 203 outputs to light signal.The 4th WSC281 will be through the data channel light signal and the coupling of supervisory channel light signal of amplifying.
The running status of the image intensifer with configuration like this is described now.Channel monitoring unit first WSC201 of 200 usefulness isolates the wavelength of supervisory channel, and converts this supervisory channel light signal to electric signal with electro-optic detector 202.System control unit 203 is separated from the supervisory channel electric signal for information about with the input channel quantity of current amplification unit.
First photo-coupler 210 will be by first WSC201 about 1% the isolating of data channel light signal.First PD211 converts the data channel light signal to electric signal, and this electric signal is outputed to amplification control module 240.Second photo-coupler 260 will be amplified and be passed through about 1% isolation of the data channel light signal of second decoupling device 250 by amplifying unit 230.Second PD261 converts segregate data channel light signal to electric signal, and this electric signal is transported to amplification control module 240.
Amplify the power that control module 240 will be passed to the data channel light signal of amplifying unit 230 and check, and the specified data channel has increased or reduced with the value of the electric signal of the 1st PD211 reception.The gain of amplifying unit 230 is to be subjected to the result who checks of amplifying power is controlled.Amplification control module 240 is sent to system control unit 203 with the amplification situation of amplifying unit 230.
External control unit 270 by a RS-232C cable with amplify control module 240 and link, and allow the user to control the amplification performance of amplifying unit 230 from the mode of the state of external detection amplifying unit 230 and the parameter by adjusting amplifying unit 230.
In amplifying unit 230, gain is to be subjected to the pump power of first and second pump light sources 232 and 235 control, and 232 and 235 amplified control module 240 controls.Amplifying unit 230 is amplified control module 240 controls again.Amplifying unit 230 can be by controlled amplification coefficient amplification data channel optical signal.
Amplification resembles followingly to be finished described.When the centre wavelength from first and second pump light sources 232 and 235 was the pump light arrival EDF233 of 980nm, the ground state erbium ions that the pump light of injection is about to EDF233 activated, because be mixed with among the amplification medium EDF such as er element rare earth element such as (Er).Data channel signal is promptly amplified by this mode of emission that strengthens the er element that has been activated.
First and second isolators 220 block and reverse spontaneous emission and gain index and the noise figure of being improved amplifying signal by the optical device beam reflected that links to each other with each isolator 220 and 250 of amplifying by the EDF233 generation by forward with 250.
Wavelength coupling unit 280 utilizes electrical to optical converter 282 to convert supervisory channel electric signal (comprising the amplification of amplifying unit 230 data) to light signal, and utilize the 4th WSC281 to be coupled again, and this composite signal is sent to next interface or the receiving interface of amplifying through data channel light signal and the supervisory channel light signal that amplifies.
Fig. 3 is the process flow diagram that carries out the method for Sustainable Control according to the output power of each channel to image intensifer of the present invention.Referring now to Fig. 3 running status of the present invention is described.
At first, the output of each channel of amplifying unit 230 all is subjected to Sustainable Control, the output valve of second PD261 depends on the quantity of input channel, and the quantity of this input channel to be the maximum quantity by changing the channel that can be amplified by EDF233 and the way of the channel quantity between the minimum number measure.In step 300, the output valve of second PD261 that becomes along with the variation of channel quantity is as in the storage unit of data storing in being installed on amplification control module 240 (do not give among the figure and illustrating).In addition, the power of each channel output is prescribed a plurality of values, and the output valve of second PD261 that measures according to each output valve of determining as data storing in being installed on the storage unit of amplifying in the control module 240.The user can utilize external control unit 270 to select a desired output valve from being stored in the numerical value the inside of amplifying the control module 240 for each channel.External control unit 270 is connected with amplification control module 240 by the RS-232 cable.
First WSC201 makes supervisory channel light signal and input optical signal decoupling.Photoelectric commutator 202 converts the supervisory channel light signal of decoupling to electric signal and this electric signal is stored in the system control unit 203.System control unit 203 is separated the channel quantity of data channel signal from supervisory channel.
Amplify 240 pairs of power of control module and check, judgement is made in the variation of channel quantity, and the channel quantity that will separate is read from system control unit 203 from the input optical signal of first PD211 reception.
In step 302, amplify the target output value that control module 240 is read second PD261, and this target output value is to be determined by the channel quantity that the data separating from be stored in system control unit 203 is come out.In step 304, the mode of amplifying the output valve of control module 240 by measuring second PD261 is measured the output power of the data channel light signal that amplified by amplifying unit 230.In step 306, amplify control module 240 desired value in the step 302 and the measured value in the step 304 are compared.If two values are actually identical, so, the information of relevant current amplification unit 230, as the quantity of channel, the driving current value of pump light source etc. will be output to system control unit 203 or external control unit 270.System control unit 203 appends to the magnifying state data of the current amplification unit of exporting from amplification control module 240 230 on the supervisory channel data and the result and outputs to electrical to optical converter 282.Electrical to optical converter 282 becomes light signal to the supervisory channel electrical signal conversion from system control unit 203 inputs.In step 310, the 4th WSC281 makes supervisory channel light signal and the data channel light signal coupling of amplifying through amplifying unit 230, and coupled signal is sent to next interface or the receiving interface of amplifying.
If the desired value in the step 302 is not equal to the measured value in the step 304 actually, amplify poor that control module 240 will be according between desired value and the measured value so in step 308, mode of the input current by controlling first and second pump light source 232 and 235 makes these two values equal.If the user has falsely dropped output valve for each channel, perhaps variation has taken place in the quantity of channel, and the output valve of the new standard of second PD261 then becomes desired value, thereby the output of each channel is maintained.That is to say that as mentioned above, when the output of each channel was selected, the control that gain promptly is subjected to amplifying control module 240 was even also be like this when the quantity of the intensity of the input signal of each channel or channel changes.Therefore, the output of each channel is invariable.Especially, no matter be that the quantity that coupling or isolation owing to channel make channel changes, and then the overshoot of each channel power that produces all can be suppressed, thereby make the output of channel invariable.
What Fig. 4 A and 4B showed is that the wavelength of optical signal of two channels is respectively 1542nm and 1560nm, the output situation of each channel when being input to the image intensifer that comes from this invention.In Fig. 4 A, the power input of each channel is-15dBm; Among Fig. 4 B, the power input of each channel is-20dBm; In two figure, no matter import size, output power is constant+5dBm.Among the figure, dot-and-dash line is represented the waveform imported, and solid line is represented the waveform exported.
What Fig. 5 A and Fig. 5 B showed is that the wavelength of four channels is respectively 1542nm, 1548nm, the output situation of each channel when the light signal of 1554nm and 1560nm is input to the image intensifer that comes from this invention.In Fig. 5 A, the power input of each channel is-15dBm; Among Fig. 5 B, the power input of each channel is-20dBm; In two figure, no matter import size, its output power is constant+5dBm.Among the figure, dot-and-dash line is represented the waveform imported, and solid line is represented the waveform exported.
According to the present invention, when the input optical signal with a plurality of data channels was exaggerated, the amplification degree by the control amplifier section also made the desired value of output valve of each channel identical with measured value actually, thereby make the output power of each channel invariable.Especially, even when the intensity of an input signal or channel quantity change, it is constant that the output of each channel also can keep, and therefore, image intensifer of the present invention can be used in channel couples/piece-rate system.
Simultaneously, many additional optical device are also inessential, and this optical amplifier structure is simple, thereby are easy to be applied in the actual optical communication system.
In addition, the output power of each channel can represent that the user selects the output power of each channel with the data of a plurality of relatively light signals from numerical value.Thereby, can to the output power of each channel different requirements be proposed according to the structure of selected transmission system.
Claims (2)
1. the output power of each channel of an image intensifer is carried out a kind of method of Sustainable Control, may further comprise the steps:
(a) when the power of each channel of the image intensifer that is used to amplify the data channel light signal with a plurality of channels is subjected to Sustainable Control, in the number of channel that changes the data channel light signal, the output power of measuring light amplifier, and store with the quantity of channel with by the output power value of channel quantity decision;
(b) mode of the power by measuring input data channel light signal is judged the variation of the channel quantity of the data channel light signal that is contained in the input optical signal;
(c) from step (a) the storage output power value in, corresponding to isolated channel quantity, the output power value of image intensifer is set and with it as desired value;
(d) measurement is through the output power of the input signal light of image intensifer amplification;
(e) gain of adjustment image intensifer is so that the value of measuring equates with desired value actually.
2. a kind of method of the output power of each channel of Sustainable Control image intensifer may further comprise the steps:
(a) power when each channel of image intensifer has been determined a plurality of values, in the channel quantity that changes the data channel light signal, and the output power of measuring light amplifier, and channel quantity and the output power value that determined by channel quantity stored;
(b) judge the variation of the channel quantity of the data channel light signal that is contained in the light signal with the mode of the power of measuring input data channel light signal, and channel quantity is separated from the data channel light signal;
(c) from the output power value that step (a), stores, corresponding to isolated channel quantity, the output power value of image intensifer is set and with it as desired value;
(d) measurement is through the output power of the input signal light of image intensifer amplification;
(e) gain of adjustment image intensifer is so that the value of measuring equates with desired value actually.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR983502 | 1998-02-06 | ||
| KR3502/1998 | 1998-02-06 | ||
| KR1019980003502A KR19990069330A (en) | 1998-02-06 | 1998-02-06 | Optical amplifier with constant output power per channel and its method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1241728A CN1241728A (en) | 2000-01-19 |
| CN1131458C true CN1131458C (en) | 2003-12-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN99100602A Expired - Fee Related CN1131458C (en) | 1998-02-06 | 1999-02-08 | Optical amplifier for constantly adjusting per-channel output power and method thereof |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JPH11275027A (en) |
| KR (1) | KR19990069330A (en) |
| CN (1) | CN1131458C (en) |
| CA (1) | CA2261257A1 (en) |
| FR (1) | FR2777142A1 (en) |
| GB (1) | GB2334397B (en) |
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| US6307670B1 (en) | 1999-12-14 | 2001-10-23 | Corning Incorporated | Pump power control for optical fiber amplifier |
| AUPQ511700A0 (en) * | 2000-01-17 | 2000-02-10 | University Of Sydney, The | Method and apparatus for monitoring of data channels |
| AU781588B2 (en) * | 2000-01-17 | 2005-06-02 | University Of Sydney, The | Method and apparatus for monitoring of data channels |
| KR100346221B1 (en) * | 2000-09-06 | 2002-08-01 | 삼성전자 주식회사 | Gain control device and method thereof for a erbium doped fiber amplifier |
| US6504989B1 (en) | 2000-10-23 | 2003-01-07 | Onetta, Inc. | Optical equipment and methods for manufacturing optical communications equipment for networks |
| US6498677B1 (en) | 2000-10-23 | 2002-12-24 | Onetta, Inc. | Optical amplifier systems with transient control |
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| US6731424B1 (en) | 2001-03-15 | 2004-05-04 | Onetta, Inc. | Dynamic gain flattening in an optical communication system |
| US6529316B1 (en) | 2001-05-03 | 2003-03-04 | Onetta, Inc. | Optical network equipment with optical channel monitor and dynamic spectral filter alarms |
| US6483631B1 (en) | 2001-06-05 | 2002-11-19 | Onetta, Inc. | Optical amplifier spectral tilt controllers |
| US6545800B1 (en) | 2001-06-05 | 2003-04-08 | Onetta, Inc. | Depolarizers for optical channel monitors |
| GB0129717D0 (en) | 2001-12-12 | 2002-01-30 | Marconi Comm Ltd | A method and an apparatus for signal transmission |
| JP4198082B2 (en) * | 2004-03-24 | 2008-12-17 | 富士通株式会社 | Optical amplifier gain monitoring method and apparatus |
| ATE544252T1 (en) * | 2009-06-02 | 2012-02-15 | Alcatel Lucent | METHOD AND DEVICE FOR ADJUSTING POWER GAIN |
| CN103647539B (en) * | 2013-11-08 | 2017-01-11 | 上海华力微电子有限公司 | Switching device and multichannel coupling selector provided with same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2714982B1 (en) * | 1994-01-13 | 1996-02-02 | Alcatel Nv | Regulated optical amplifier. |
| JP3379052B2 (en) * | 1994-09-26 | 2003-02-17 | 富士通株式会社 | WDM optical amplifier, WDM transmission system, and WDM transmission method |
| US6025947A (en) * | 1996-05-02 | 2000-02-15 | Fujitsu Limited | Controller which controls a variable optical attenuator to control the power level of a wavelength-multiplexed optical signal when the number of channels are varied |
| JPH09321701A (en) * | 1996-05-31 | 1997-12-12 | Fujitsu Ltd | Optical communication system and optical amplifier |
-
1998
- 1998-02-06 KR KR1019980003502A patent/KR19990069330A/en not_active Application Discontinuation
-
1999
- 1999-02-08 CA CA002261257A patent/CA2261257A1/en not_active Abandoned
- 1999-02-08 CN CN99100602A patent/CN1131458C/en not_active Expired - Fee Related
- 1999-02-08 JP JP11030656A patent/JPH11275027A/en active Pending
- 1999-02-08 GB GB9902566A patent/GB2334397B/en not_active Expired - Fee Related
- 1999-02-08 FR FR9901439A patent/FR2777142A1/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| KR19990069330A (en) | 1999-09-06 |
| CN1241728A (en) | 2000-01-19 |
| CA2261257A1 (en) | 1999-08-06 |
| GB9902566D0 (en) | 1999-03-24 |
| FR2777142A1 (en) | 1999-10-01 |
| GB2334397A (en) | 1999-08-18 |
| JPH11275027A (en) | 1999-10-08 |
| GB2334397B (en) | 2000-11-15 |
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