CN1402073A - Distributed Raman amplification subsystem and device - Google Patents
Distributed Raman amplification subsystem and device Download PDFInfo
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- CN1402073A CN1402073A CN02139059A CN02139059A CN1402073A CN 1402073 A CN1402073 A CN 1402073A CN 02139059 A CN02139059 A CN 02139059A CN 02139059 A CN02139059 A CN 02139059A CN 1402073 A CN1402073 A CN 1402073A
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Abstract
A distributed Raman amplification subsystem for configuring and automatically controlling the pump power on network management interface and its devices are disclosed. The pump power values needed by different optical fibres under different Raman gains are preset in the subsystem. The actual output power of each pump laser is indirectly measured and then compared with the given value by a feedback-ring controller in order to regulate its output power for meeting requirement.
Description
Technical field
The present invention relates to a kind of distribution Raman and amplify subsystem and device thereof, be used for the telecommunication transmission field, relate in particular to the optical fiber telecommunications system that needs the employing light amplification, for example high speed, long distance or over distance dense wave division multipurpose (DWDM) system and high speed, single-channel Optical synchronization digital net (SDH).
Background technology
Particularly in dense wave division multipurpose (DWDM) system, image intensifer can be described as requisite at jumbo optical transmission system.Just because of the invention of Erbium-Doped Fiber Amplifier (EDFA) (EDFA), dense wave division multipurpose (DWDM) technology just is able to develop rapidly.Current, spread all over the world based on dense wave division multipurpose (DWDM) system of EDFA Optical Amplification Technology.Yet EDFA also will introduce noise when providing gain to signal, i.e. amplified spont-aneous emission (ASE) noise, thereby the performance of deterioration system.Usually EDFA is a kind of optical amplification device of lump type, makes its noise figure be subjected to the restriction of 3dB quantum limit, and promptly noise figure can not be lower than 3dB.Under such restriction, conventional dwdm system regeneration transmission distance has only the hundreds of kilometer.
In order to realize hypervelocity, high channel number, extra long distance DWDM light transmission, be badly in need of a kind ofly can providing gain, not producing the image intensifer of too big noise again.The Raman fiber amplifier that distributes just in time can satisfy such requirement, because its intrinsic distribution amplification characteristic, the equivalent noise index of this amplifier can be broken through the restriction of 3dB quantum limit, even can be negative value.The main effect of distribution Raman amplifier in system is the Optical Signal To Noise Ratio (OSNR) of significantly improving transmission line, increases the Q value degree more than needed of system.Utilize this degree more than needed, we can be used for: 1) prolong the span between the amplifier greatly, can reach 250km at present; 2) prolong not have electricity regeneration distance, utilize Raman-EDFA to mix to amplify the nothing electricity regeneration Optical Fiber Transmission that can realize thousands of kilometers even up to ten thousand kilometers; 3) improve receiving sensitivity, help the high bit rate signal transmission, the distribution Raman amplifier will be one of 40Gbit/s topmost technology of epoch; 4) reduce launched power, thereby avoid the various nonlinear effects of optical fiber effectively, so not only help the signal transmission, and help reducing the WDM channel spacing, increase the number of channel, thereby improve spectrum efficiency.Raman amplifier also has some other characteristics: 1. Raman gain is not limited to any specific wavelength district.As time goes on, the application that Raman amplifies extends to whole oolemma, from 300nm～2000nm, even enters visible band.Recent DWDM is used, and in fact Raman gain can be used for 1300～1700nm low-loss district of optical fiber.And the usable range of EDFA has only the window of 100nm nearly at 1525～1620nm.2. utilize the multi wavelength pumping technology, can obtain wide gain bandwidth (GB) (～100nm).3. the topological structure of Raman amplifier design is simpler than EDFA because in Transmission Fibers direct amplifying optical signals just, and do not need special gain media.
The physical basis that Raman amplifies is stimulated Raman scattering (SRS), and this effect is that India physicist C .V.Raman found in nineteen twenty-eight.In nonlinear medium, incident beam ω
pWith the result of medium atomic interaction, make incident photon generation inelastic scattering, lose part energy, produce another low frequency photon ω
sThe energy that loses is absorbed by the form of medium with molecular vibration, promptly develops into optical phonon, and this process is called the Raman scattering effect.In Raman scattering, the difference on the frequency of incident photon and scattered photon is called Stokes (Stokes) frequency displacement, by the vibration mode decision of medium.When the flashlight of a branch of pump light and a branch of Stokes shift transmits (reverse in the same way or two-way) simultaneously in optical fiber 20, will produce stimulated Raman scattering, the part energy of pump light will be transferred to flashlight, make flashlight obtain amplifying, Here it is, and Raman amplifies, as shown in Figure 1 and Figure 2.
Discover that silica fibre has very wide stimulated Raman scattering (SRS) gain spectral, and the main peak of a broad is arranged near 13.2THz, as shown in Figure 3.If a weak signal and a heavy pumping light wave transmit in optical fiber simultaneously, and the weak signal wavelength is placed in the Raman gain bandwidth of pump light, weak signal light can obtain amplifying, and this image intensifer based on stimulated Raman scattering mechanism promptly is called optical fiber Raman amplifier.Fig. 4 has drawn the energy level diagram that Raman amplifies, the pump photon of incident is activated to virtual high level with electronics from low-lying level, stimulated radiation takes place then, signal is amplified, electron level transits to the last phonon energy level of quartzy molecule downwards, this energy level has certain width, originates from the amorphous characteristic of quartz glass, so silica fibre has the Raman gain spectrum of broad.The Stokes shift amount is corresponding to the self-energy of phonon, and to silica fibre, this frequency displacement is approximately 13.2THz (at 1550nm wavelength～100nm).Because it is that a kind of disresonance type amplifies that Raman amplifies, therefore suitable as long as pumping is selected, can obtain gain at any wavelength.The shortcoming of Raman amplifier is that conversion efficiency is low, solves by two kinds of methods at present, and the one, select the high optical fiber (as dispersion compensating fiber DCF) of Raman gain efficient as gain media; The 2nd, utilize the pumping source of high-output power.Pumping source development based on diode laser at present is very fast, and up-to-date high-power laser diode output power can be more than 1W, and the Raman optical fiber laser output power of new diode array cladding pumping can surpass 10W.
Along with the maturation of high-power semiconductor laser manufacturing technology, Raman amplifier is commercial.Yet for the distribution Raman amplifier, because its amplification medium is a Transmission Fibers, the supplier of Raman's module only provides the pumping source of multi-wavelength usually at present, for how effectively it to be applied to system, does not generally provide solution.Strict it is truly Raman amplifier that the Raman gain module also is not really in fact, and the distribution Raman fiber amplifier from the Raman gain module to practicability also has a lot of work to do.Wherein, technical difficult points is to design the perfect pump power controlling schemes of a cover, thus in various application scenario rapidly, convenient, realize satisfying the requirement of dwdm system by flat gain effectively.
Current, distribution Raman amplifying technique is applied to commercial dwdm system, demands a scientific and rational solution urgently.This be because, the Raman's amplification characteristic and the circuit optical fiber of distribution are closely related, along with the difference of optical fiber kind, Raman gain spectrum has very big otherness.Distribute in the dwdm system that amplifies comprising Raman,, need to regulate on the circuit output power of each pump laser in each raman pumping module in order to realize flat gain.Commercial Raman's module comprises 4～8 pump lasers usually, and the dwdm system of a long distance contains several to the dozens of section of striding, and as seen this adjusting work will be very loaded down with trivial details, and needs to be equipped with testing apparatuss such as multi-wavelength signals source and spectroanalysis instrument.Finish such work or acceptable in the laboratory, if also need to carry out such adjusting in engineering opening and maintenance process, then not only bothersome effort improves greatly and opens and maintenance cost, and often is difficult to such experiment condition.
Summary of the invention
The objective of the invention is the distribution Raman in the dwdm system is provided by the solution that provides on the subsystem aspect, with various optical fiber, required pump power is preset in the subsystem under the various Raman gains, during practical application, different according to circuit optical fiber kind and required Raman's gain amplifier, only need on network management interface, to carry out simple configuration, just can realize smooth Raman's gain amplifier, avoided pump power loaded down with trivial details in engineering opening and the maintenance process to regulate problem, make in the DWDM optical transmission system, image intensifer reaches certain gain flatness, the luminous power and the Optical Signal To Noise Ratio that guarantee each optical channel of receiving end meet the demands, and realize the no error code transmission of each channel.
The solution that provides on the subsystem aspect is provided the distribution Raman in the dwdm system in the present invention, distribution Raman amplifies the control of subsystem to pump power, be that required pump power under various optical fiber, the various Raman gain is preset in the subsystem, during practical application, different according to circuit optical fiber kind and required Raman's gain amplifier are configured on network management interface.
Described distribution Raman amplifies subsystem, be that Output optical power to each pump laser carries out indirect detection, and the value that arrives of acquisition testing, utilize a feedback loop control circuit that comprises microprocessor, collection value and set-point are compared, the feedback loop control circuit is regulated according to the permission difference of setting, and up to reaching requirement, realizes the output power of a plurality of laser instruments is configured and control automatically.
Described distribution Raman amplifies subsystem, the concrete configuration mode is the network management configuration mode, different configurations with raman pumping according to optical fiber kind and Raman's gain amplifier are divided into several mode of operations, the corresponding a kind of specific optical fiber of each pattern and certain specific Raman gain value, the performance number of also corresponding one group of raman pumping laser instrument, these values are measured by experiment, be kept in the rom memory in the high power pump unit, only need size during engineering opening according to the required Raman gain of kind and system of user's optical fiber, on network management interface, click corresponding work mode, just can realize desired Raman gain and gain flatness automatically.
Described distribution Raman amplifies subsystem, configuration mode can be the continuous regulative mode of webmaster, what the continuous regulative mode of webmaster was imported on network management interface is the concrete performance number of each pump laser, be the output power of regulating each pump laser by network management interface continuously, it should be identical with the real output of laser instrument.
Described distribution Raman amplifies subsystem, configuration mode can also be the manual shift mode, be meant the drive current of each pump laser in the manual adjustment Raman gain module, make the luminous power of their output reach needed value, or make Raman amplifier reach required gain and gain flatness
The device that distribution Raman amplifies subsystem comprises high power pump unit and Transmission Fibers two parts, it is characterized in that the high power pump unit mainly comprises power supply, Raman gain module RGM and peripheral circuit thereof, microprocessing unit MPU and interface section thereof, Raman gain module RGM is made of pump laser and driving circuit thereof, various Passive Optical Components, PIN detector, generally encapsulate with modular form, electrical interface and optical interface externally are provided, and the data of Raman gain module RGM electrical interface output are delivered to the peripheral circuit ALM﹠amp of RGM; PM, BFM, ATC.ALM﹠amp; Performance data among the PM links to each other ALM﹠amp by its data bus with the data bus of MPU after the conversion of A/D change-over circuit; Alarm data among the PM can directly be linked the I/O mouth of MPU, the APC circuit receives the data from BFM on the one hand, receive on the other hand from microprocessing unit MPU and send and through the data after the D/A conversion, through linking to each other with the control terminal of Raman gain module RGM after its internal circuit conversion, for RGM provides driving.Handle by intercept and slope-compensation through disappearing for BFM, receive the data bus of microprocessing unit MPU after the A/D conversion.Microprocessing unit MPU links to each other with backboard with address wire by its serial data bus, clock line, and carries out the exchange of data and control information between the webmaster, and the ATC circuit is controlled automatically to the temperature of pump laser.
Advantage of the present invention provides a kind of flexible configuration, practical distribution Raman amplifies the subsystem technology scheme, has following characteristics:
1. practical, diversified pump power control mode are convenient to the system applies of Raman amplifier.
The manual shift mode makes Raman amplifier still can provide smooth gain under the situation that webmaster, microprocessing unit lost efficacy;
The network management configuration mode is equipped with 9 kinds of mode of operations at different gains and dissimilar predispersed fibers, also can expand as required in the future;
The continuous regulative mode of webmaster, within the specific limits, by webmaster can each pump laser of regulated at will output power, thereby realize needed Raman gain and gain flatness.Utilize this mode, can compensate the gain unevenness that causes because of the EDFA cascade to a certain extent.
2. optical fiber there is not specific (special) requirements, applicable to the silica fibre of all kinds, different manufacturers, as standard single-mode fiber (NDSF), dispersion shifted optical fiber (DSF), non-zero dispersion displacement optical fiber (NZ-DSF), dispersion compensating fiber (DCF) etc.;
3. Raman gain height, to standard single-mode fiber (NDSF), turn off gain can be greater than 10dB;
To DCF optical fiber, Raman gain can reach more than the 20dB.
4. gain flatness height, to C-band, gain flatness is near 1dB; To the C+L wave band,
Gain flatness can be controlled in the 1.5dB;
5. noise is low, and the equivalent noise index is near 0dB.
6. have pumping and automatically shut down function, fibercuts or connection when front, high power pump unit
Head is when getting loose, and pumping moment automatically shuts down, thus the safety of keep the scene intact personnel and equipment.
7. self provide performance monitoring and alarm function to the high power pump unit;
3. the light signal to input carries out power monitoring.
Description of drawings
Fig. 1 is the Raman scattering synoptic diagram;
Fig. 2 is the basic principle schematic that Raman amplifies;
Fig. 3 is the gain spectrogram that silica fibre Raman amplifies;
Fig. 4 is the energy level diagram that silica fibre Raman amplifies;
Fig. 5 is the application block diagram of distribution Raman amplifier (DRA) in dwdm system;
Fig. 6 is the block diagram that Raman of the present invention amplifies subsystem assembly;
Fig. 7 is a software flow pattern of the present invention.
Embodiment
The distribution Raman fiber amplifier is different from conventional EDFA, and its structure is open, tens of kilometers because the core component-gain media in the amplifier (Transmission Fibers or dispersion compensating fiber DCF) will stretch out usually.Therefore, a distribution Raman amplifies subsystem and comprises high power pump unit 50 and Transmission Fibers 20 two parts, and Transmission Fibers is also served as gain media except transmission signals.If gain media adopts DCF, then such Raman amplifier also has the function of dispersion compensation.
Because the Amplifier Gain medium is common Transmission Fibers, so amplifier not only can not propose any specific (special) requirements to optical fiber, on the contrary, also wants to adapt to various fiber types.Even same type optical fiber, as optical fiber G.652, the product that different manufacturers is sold, Raman's amplification characteristic is also slightly different, and amplifier should have the ability of this species diversity of opposing.
Raman disclosed by the invention amplifies subsystem, satisfies requirement recited above fully, and key is high power raman pumping unit (RPU) wherein.This RPU has adopted special monitoring feedback loop backlight (BFM Feedback Loop) technology, and not only stable performance, flexible configuration can adapt to the silica fibre of any kind, and possess function of safety protection.
Fig. 6 shows a case study on implementation of the present invention, and Raman amplifies subsystem and is made up of high power raman pumping unit (RPU) 50 and Transmission Fibers 20, and wherein high power raman pumping unit 50 comprises hardware circuit and two parts of Control Software.
Hardware circuit comprises:
1. power supply 40: for whole unit provides direct current supply voltage.
2. Raman gain module (RGM) 30: most important element in the unit partly is made of pump laser and driving circuit thereof, various Passive Optical Components, PIN detector etc.Generally, externally provide electrical interface and optical interface with the modular form encapsulation.
3. the peripheral circuit of Raman gain module (RGM): for RGM provides driving, automated power control (APC) 42 and automatic temperature-adjusting control (ATC) 44 etc., and to performance and the warning information (ALM﹠amp of RGM; PM) 41 handle, report webmaster.
4. microprocessing unit (MPU) and interface: MPU thereof are based on the control module of one chip microcomputer, its major function reports the NE management unit (EMU) except information such as the alarm of gathering high power raman pumping unit, performances, a critical function is the automatic control that realizes pump unit, it is the control center of this unit, be mainly used to control the output power of each pump laser among the RGM, turn-off pumping in case of necessity, its control procedure is realized by software.MPU also has a function to provide the DEBUG debug port, is convenient to the debugging of pump unit.
The power control of each pump laser detects the output power backlight of pump laser as feedback control signal with configuration by monitoring feedback loop backlight, intercept and slope-compensation are handled through disappearing, obtain the collection value of pumping output power, as foundation to configuration of pumping output power and control, utilize a feedback loop control circuit that comprises microprocessor, the output power of a plurality of laser instruments is configured and control automatically.Microprocessing unit is still realized by the drive current of regulating pump laser the configuration and the control of pumping output power.
Scheme comprises three kinds of pump power regulative modes to be described in detail below, i.e. manual shift mode, network management configuration mode and the continuous regulative mode of webmaster can adopt wherein any one as required in system applies.
The manual shift mode is meant the drive current of each pump laser in the manual adjustment Raman gain module, makes the luminous power of their output reach needed value, or makes Raman amplifier reach required gain and gain flatness.This mode does not need webmaster, does not even need microprocessing unit (MPU), is particularly suitable under lab studying Raman's enlarge-effect.Using although the manual shift mode not quite is fit to the scene of system, also is that system manufacturer is needed.Utilize this pumping regulative mode, can find out Raman's enlarge-effect of various optical fiber, thereby find out a cover optimal parameter configuration, for following network management configuration mode provides foundation.
The network management configuration mode is that the different configurations with raman pumping according to optical fiber kind and Raman's gain amplifier are divided into several mode of operations, the corresponding a kind of specific optical fiber of each pattern and certain specific Raman gain value.For example, it is the SMF28 of Corning company that pattern 1 is represented Transmission Fibers, and Raman's turn off gain of system requirements is 8dB; It is the G.652 fine of Fiberhome Telecommunication Technologies Co., Ltd. that pattern 2 is represented Transmission Fibers, and Raman's turn off gain of system requirements is 10dB; Or the like.During engineering opening, only need size, on network management interface, click corresponding work mode, just can realize desired Raman gain and gain flatness automatically according to the required Raman gain of kind and system of user's optical fiber.Raman disclosed by the invention amplifies subsystem and has preset 9 kinds of mode of operations, also can infinitely expand as required from now on.The performance number of the corresponding one group of raman pumping laser instrument of each mode of operation, these values are measured by experiment, be kept in the memory (ROM) of high power pump unit, the control of the power of each pump laser realizes by monitoring feedback loop technology backlight with configuration.
The continuous regulative mode of webmaster is exactly the output power of regulating each pump laser by network management interface continuously, this mode is somewhat similar to first kind of mode, different is that this mode is at network management interface adjusted power, and the manual shift mode must directly be operated on the high power pump unit.Also have a bit important difference, what the continuous regulative mode of webmaster was imported on network management interface is the concrete performance number of each pump laser, and it should be identical with the real output of laser instrument, and the manual shift mode must be furnished with instrument and be monitored.Under the situation of webmaster operate as normal, the continuous regulative mode of webmaster can replace the manual shift mode that the gain and the gain flatness of Raman amplifier are adjusted.When the second way is several mode of operations of network management configuration mode all can not satisfy actual demands of engineering the time, adopt the continuous regulative mode of webmaster also can reach the purpose of engineering opening.This mode also has a very important purposes, the EDFA cascade causes the gain unevenness of DWDM signal easily in the system, at this moment, can adopt the continuous regulative mode of webmaster to carry out fine tuning, the gain flatness of DWDM signal be improved to a certain extent by regulating Raman gain spectrum.
Fig. 7 is a pump power Control Software process flow diagram of the present invention.Control Software mainly is responsible for the data of gathering are handled, implemented the automatic control of high power pump unit, also be responsible in addition and EMU between communicate by High level data link control (HDLC).
The control procedure of pump power is as follows:
MPU receives the instruction from webmaster, if continuous regulative mode, then calculate the initial value of each pump laser drive current and the reference value P2 that P is ordered, download the drive current initial value that calculates and arrive each pump laser according to the one group of pump power values that receives.The monitoring P collection value P1 of order, and with P1 with P2 relatively if P1 is bigger two more than the unit than P2, then reduces a unit with drive current; If P1 is littler two more than the unit than P2, then drive current is raised a unit; If the difference between P1 and the P2 does not then adjust drive current in two units.Such process is proceeded down, receives the new instruction of webmaster up to MPU.MPU receives the instruction from webmaster, if network management configuration mode, then according to the code of the mode of operation that receives, from the rom memory of high power pump unit, read the initial value of each pump laser drive current and the reference value P2 that P is ordered, download the drive current initial value to each pump laser.The monitoring P collection value P1 of order, and with P1 with P2 relatively if P1 is bigger two more than the unit than P2, then reduces a unit with drive current; If P1 is littler two more than the unit than P2, then drive current is raised a unit; If the difference between P1 and the P2 does not then adjust drive current in two units.Such process is proceeded down, receives the new instruction of webmaster up to MPU.
Raman disclosed by the invention amplifies subsystem and is mainly used in following occasion:
1. conventional N * 2.5Gb/s, N * 10Gb/s (N=4,8,16 ..., 40) the dwdm system spy
Different line configuring;
2. as the selectable unit (SU) of 160 * 10Gb/s dwdm system;
3. extra long distance dwdm system institute is essential;
4. 10Gb/s, 40Gb/s SDH system.
In dwdm system, distribution Raman amplifier (DRA) uses in conjunction with EDFA usually, is placed on the receiver side of each section of striding, and is used for improving the Optical Signal To Noise Ratio of DWDM signal.Exemplary systems is used block diagram as shown in Figure 5: TX is that transmitter, MUX are that wavelength division multiplexer, EDFA are that Erbium-Doped Fiber Amplifier (EDFA), DRA are that distribution Raman amplifier, DEMUX are that demodulation multiplexer, RX are receivers.
Claims (7)
1, a kind of distribution Raman amplifies subsystem, comprise control to pump power, it is characterized in that required pump power under various optical fiber, the various Raman gain is preset in the subsystem, during practical application, different according to circuit optical fiber kind and required Raman's gain amplifier are configured on network management interface.
2, distribution Raman according to claim 1 amplifies subsystem, it is characterized in that subsystem carries out indirect detection to the Output optical power of each pump laser, the value that acquisition testing arrives, utilize a feedback loop control circuit that comprises microprocessor, collection value and set-point are compared, the feedback loop control circuit, is realized the output power of a plurality of laser instruments is configured and control automatically up to reaching requirement according to the drive current of the permission difference adjusting laser instrument of setting.
3, distribution Raman according to claim 1 and 2 amplifies subsystem, the power control that it is characterized in that each pump laser and configuration are that output power backlight by detecting pump laser is as feedback control signal, handle through disappear intercept and slope-compensation, obtain the collection value of pumping output power.
4, distribution Raman according to claim 1 and 2 amplifies subsystem, it is characterized in that the concrete configuration mode is the network management configuration mode, different configurations with raman pumping according to optical fiber kind and Raman's gain amplifier are divided into several mode of operations, the corresponding a kind of specific optical fiber of each pattern and certain specific Raman gain value, the performance number of also corresponding one group of raman pumping laser instrument, these performance numbers are measured by experiment, be kept in the rom memory in the high power pump unit, only need size during engineering opening according to the required Raman gain of kind and system of user's optical fiber, on network management interface, click corresponding work mode, just can realize desired Raman gain and gain flatness automatically.
5, distribution Raman according to claim 1 and 2 amplifies subsystem, it is characterized in that configuration mode can be the continuous regulative mode of webmaster, what the continuous regulative mode of webmaster was imported on network management interface is the concrete performance number of each pump laser, be the output power of regulating each pump laser by network management interface continuously, it should be identical with the real output of laser instrument.
6, distribution Raman according to claim 1 amplifies subsystem, its feature configuration mode can also be the manual shift mode, be meant the drive current of each pump laser in the manual adjustment Raman gain module, make the luminous power of their output reach needed value, or make Raman amplifier reach required gain and gain flatness
7, a kind of Raman of distribution amplifies the device of subsystem, comprise high power pump unit and Transmission Fibers two parts, it is characterized in that the high power pump unit mainly comprises power supply, Raman gain module RGM and peripheral circuit thereof, microprocessing unit MPU and interface section thereof, Raman gain module RGM is made of pump laser and driving circuit thereof, various Passive Optical Components, PIN detector, generally encapsulate with modular form, electrical interface and optical interface externally are provided, and the data of Raman gain module RGM electrical interface output are delivered to the peripheral circuit ALM﹠amp of RGM; PM, BFM, ATC.ALM﹠amp; Performance data among the PM links to each other ALM﹠amp by its data bus with the data bus of MPU after the conversion of A/D change-over circuit; Alarm data among the PM can directly be linked the I/O mouth of MPU, the APC circuit receives the data from BFM on the one hand, receive on the other hand from microprocessing unit MPU and send and through the data after the D/A conversion, through linking to each other with the control terminal of Raman gain module RGM after its internal circuit conversion, for RGM provides driving.Handle by intercept and slope-compensation through disappearing for BFM, receive the data bus of microprocessing unit MPU after the A/D conversion.Microprocessing unit MPU links to each other with backboard with address wire by its serial data bus, clock line, and carries out the exchange of data and control information between the webmaster, and the ATC circuit is controlled automatically to the temperature of pump laser.
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| CNB021390592A CN1270212C (en) | 2002-09-16 | 2002-09-16 | Distributed Raman amplification subsystem and device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7505197B2 (en) | 2003-03-13 | 2009-03-17 | Fujitsu Limited | Optical amplifier provided with control function of pumping light, and optical transmission system using the same |
| WO2019109832A1 (en) * | 2017-12-05 | 2019-06-13 | 深圳市创鑫激光股份有限公司 | Control system for laser, laser, and device with laser |
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2002
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7505197B2 (en) | 2003-03-13 | 2009-03-17 | Fujitsu Limited | Optical amplifier provided with control function of pumping light, and optical transmission system using the same |
| US7719758B2 (en) | 2003-03-13 | 2010-05-18 | Fujitsu Limited | Optical amplifier provided with control function of pumping light, and optical transmission system using the same |
| US8054455B2 (en) | 2003-03-13 | 2011-11-08 | Fujitsu Limited | Optical amplifier provided with control function of pumping light, and optical transmission system using the same |
| WO2019109832A1 (en) * | 2017-12-05 | 2019-06-13 | 深圳市创鑫激光股份有限公司 | Control system for laser, laser, and device with laser |
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| CN1270212C (en) | 2006-08-16 |
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