CN208754303U - A kind of modified power communication ultra-long span two-way optical transmission system - Google Patents
A kind of modified power communication ultra-long span two-way optical transmission system Download PDFInfo
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- CN208754303U CN208754303U CN201821496070.0U CN201821496070U CN208754303U CN 208754303 U CN208754303 U CN 208754303U CN 201821496070 U CN201821496070 U CN 201821496070U CN 208754303 U CN208754303 U CN 208754303U
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Abstract
The utility model belongs to field of power communication, and in particular to a kind of modified power communication ultra-long span two-way optical transmission system.The utility model includes: that the first enhanced forward error correction encoder is connect with Raman's optical power amplifier；Raman's optical power amplifier is connect by optical fiber transmission medium with distant pump er-doped gain fibre, realizes that the power of optical signal in transmission line improves；Remote optical pumping amplifier output is connect with Pre-EDFA；Pre-EDFA output is connected with dispersion compensation unit, adjustable attenuator；Adjustable attenuator output is connect with the second enhanced forward error correction encoder.The utility model solves the problems, such as that non-relay station or few relay station are built in ultra-long span optic communication using technologies such as Raman amplifier, remote optical pumping amplifier, Pre-EDFA, forward error correction, dispersion compensations.
Description
Technical field
The utility model belongs to field of power communication, and in particular to a kind of modified power communication ultra-long span bi-directional light biography
Defeated system.
Background technique
In the power system, power communication system is responsible for the schedulability of Operation of Electric Systems, safety and stability.
Existing power communication system has also used fiber optic communication, and optical communication station is generally located on power plant, substation, converter station etc.,
Therefore, distance between sites depend primarily on electric power primary system structure.
According to ITU-T standard, optical communication station is away from being generally divided into: intra-office (I) is 20Km；Short distance (S) is 40Km；It is long away from
It (L) is 80Km；Very long (V) is 120Km；Overlength (U) is 160Km.The ultra-long span optical transport problem within 200Km has been at present
It solves.
However, the continuous extension of transmission line of electricity, especially 750KV, 1000KV are super with the continuous expansion of electric power scale
The construction of high voltage power transmission engineering puts into operation, and many 200Km or more occurs in converter station (substation, power plant)-converter station transmission range
The even stop spacing of 400Km, and the area that transmission line of electricity (optical cable) passes through often has inconvenient traffic, and natural conditions are severe, and light is arranged
Communication relay station is very difficult.Therefore, ultra-long span optical transport technology is applied in research, increases distance between sites, is reduced in optic communication
It is urgent problem in current engineering after station.
Inventor has found in the course of the research: solving the problems, such as ultra-long span optical transport by increasing relay station, not only builds
It stands at high cost, difficult in maintenance, optical signal is handled moreover, relay station generallys use electricity device, photoelectricity-electro-optic conversion
The reliability of signal can be had an impact, electronic device also constrains the rate of optical fiber telecommunications system.
In order to solve the above technical problems, proposing a kind of power communication ultra-long span optical transport system of optimization after study
System application scheme, and discuss its implementation.
Utility model content
It is logical the technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a kind of modified electric power
Believe ultra-long span two-way optical transmission system, enhanced forward error correction FEC, Raman amplifier, distant pump technology, preposition amplification is utilized
Device and fiber dispersion compensation technique comprehensive solution have transparent transmission characteristic to a variety of digital services, reduce light biography
Relay station in defeated network greatly reduces ultra-long span transmission cost.
Ultra-long span optical transport technology refers to using power amplifier, Raman amplifier, remote optical pumping amplifier, FEC, dispersion
The technologies such as compensation.Key constraints in optical transport are power and dispersion, power amplification and dispersion compensation can be used to solve,
But light amplification and dispersion compensation also bring the factors such as noise and intersymbol interference and nonlinear effect to limit optical transport appearance simultaneously
Amount and distance, needing to be modulated by optical transport with technologies such as FEC codings improves transmission performance.
Fiber-optic Communication In Electric Power System transmission rate is generally 155Mbit/s, 622Mbit/s, 2.5Gbit/s, using most
Be ITU-TG.652 optical fiber, this fiber attenuation coefficient can averagely be pressed generally in 0.18-0.22dB/Km, Practical Project
0.20dB/Km considers.Optical transmission system is designed to need from light emitting power and receiving sensitivity, dispersion compensation, inhibit non-linear
The several respects such as effect, signal-to-noise ratio consider.The routine techniques comparative maturity such as EDFA, FEC, dispersion compensation, using also very extensive.Root
According to transmission range difference, using suitable assembled scheme.
Currently, optical transmission system distance is generally divided into three kinds: 1,100 kilometers and hereinafter, using normal tabula rasa configure
Meet transmission range requirement；It 2,100-200 kilometers, can using conventional power amplifier and prime amplifier combination and appropriate dispersion compensation
Solve the problems, such as transmission range；3,200-300 kilometers, other than conventional power amplifier and prime amplifier combination and appropriate dispersion compensation,
FEC technology should be also used, can also solve the problems, such as transmission range.We are discussed herein aiming at 300-400 kilometers non-relay
The optical transmission system of distance.
The technical solution that this patent solves above-mentioned technical problem is as follows: a kind of modified power communication ultra-long span bi-directional light
Transmission system, including sending ending equipment, receiving device and optical transmission device；
The sending ending equipment includes the first enhanced forward error correction encoder interconnected and Raman light power amplification
Device, shown first enhanced forward error correction encoder for channel coding and entangle the coding transmitted in the optical transmission device
Mistake, to improve the optical signal to noise ratio in the optical transmission device, Raman's optical power amplifier is set for improving the optical transport
The power of standby middle optical signal；
The receiving device includes sequentially connected Pre-EDFA, dispersion compensation unit, adjustable damping
Device and the second enhanced forward error correction encoder, the Pre-EDFA connect the optical transmission device and receive light
Signal, the Pre-EDFA are used to improve the power of optical signal in the optical transmission device, the dispersion compensation
Unit, to the dispersion compensation of optical signal in the optical transmission device, realizes fibre-optical dispersion and chromatic dispersion gradient using chirped fiber grating
Compensation, the adjustable attenuator receives light signal strength for adjusting, and the second enhanced forward error correction encoder is used for
Channel coding and to the code correction transmitted in the optical transmission device；
The optical transmission device includes transmission fiber medium, and the transmission fiber medium is put with Raman's optical power respectively
Big device, Pre-EDFA connection, between the transmission fiber medium and Pre-EDFA connection
It is in series with remote optical pumping amplifier.
Further, the remote optical pumping amplifier includes that er-doped remote gain optical fiber, optical fiber wave multiplexer and remotely pumping swash
Light device, the er-doped remote gain optical fiber is connected between the transmission fiber medium and Pre-EDFA, described
Optical fiber wave multiplexer is connected between the er-doped remote gain optical fiber and Pre-EDFA, and the optical fiber wave multiplexer connects
Connect the remotely pumping laser.
Further, the transmission fiber medium, er-doped remote gain optical fiber and optical fiber wave multiplexer are passive light device
Part.
Further, Raman's optical power amplifier is distributed Raman amplifier.
Further, the both ends of the modified power communication ultra-long span two-way optical transmission system are connected separately with synchronization
Digit sequence optical transmitter and receiver SDH.
Further, the transmission fiber medium 102 is ITU-TG.652 single mode optical fiber.
Further, the rate of the optical signal transmitted in the modified power communication ultra-long span two-way optical transmission system
For 155Mbps, 622Mbps, 2.5Gbps or 10Gbps.
The beneficial effect of this patent is:
1, for overlength transmission line of electricity, natural conditions are severe, non-relay station, to communication system security stable operation and daily
Maintenance brings great challenge, and it is super to solve these areas by a kind of power communication ultra-long span optical transmission system scheme of optimization
Length is away from communication issue；
2, with superior economy: compared with the scheme for building communication relay station between two stations, can greatly reduce careful
Batch, it builds a station and O&M cost, the stability and safety of raising communication operation has superior economy.
3, the use of fiber Raman amplifier greatly increases transmission range, by fiber Raman amplifier, distant pump amplifying technique,
Pre-EDFA, the optimization of enhanced forward error correction coding techniques are used cooperatively, and fiber optic communication can be significantly greatly increased
Transmission range；
4, application prospect: at present the non-relay optical transport technology of ultra-long span China's power grid carry out across great Qu and extra-high voltage
Transmit electricity and obtained great development in the construction of mating optical transmission system, and gradually promote and apply, however for High aititude, cold current,
The adverse circumstances such as desert are not much across the 350km even application of the non-relay optical transmission system of longer stop spacing, the utility model
Case study, which is applied, has important practical advice meaning.
Detailed description of the invention
It, below will be right in order to illustrate more clearly of specific embodiment of the present invention or technical solution in the prior art
Specific embodiment or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, it is described below
In attached drawing be that some embodiments of the utility model are not paying creativeness for those of ordinary skill in the art
Under the premise of labour, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is the working principle diagram of remote optical pumping amplifier；
Fig. 2 is the structural schematic diagram of the utility model；
Fig. 3 is the specific power test point schematic diagram of the utility model；
Appended drawing reference:
1- transmitting terminal；The receiving end 2-；3- optical cable；4- Er-doped fiber；5- wave multiplexer；6- transmission fiber；7- pump
Pu optical fiber；
100- the first enhanced forward error correction encoder；
101- Raman's optical power amplifier；
102- transmission fiber medium；
103- er-doped remote gain optical fiber；
104- Pre-EDFA；
105- dispersion compensation unit；
106- adjustable attenuator；
107- remotely pumping laser；
108- optical fiber wave multiplexer；
110- the second enhanced forward error correction encoder.
Specific embodiment
It is described in detail below in conjunction with embodiment of the attached drawing to technical solutions of the utility model.Following embodiment is only
For clearly illustrating the technical solution of the utility model, therefore it is only used as example, and it is originally practical to cannot be used as a limitation limitation
Novel protection scope.
It should be noted that unless otherwise indicated, technical term or scientific term used in this application should be this reality
The ordinary meaning understood with novel one of ordinary skill in the art.
In the description of the present application, it is to be understood that term " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside", " up time
The orientation or positional relationship of the instructions such as needle ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " be orientation based on the figure or
Positional relationship is merely for convenience of describing the present invention and simplifying the description, rather than the device or member of indication or suggestion meaning
Part must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as limiting the present invention.
In addition, term " first ", " second " etc. are used for description purposes only, it is not understood to indicate or imply relatively important
Property or implicitly indicate the quantity of indicated technical characteristic.The meaning of " plurality " is two in the description of the present invention,
More than, unless otherwise specifically defined.
In this application unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements.It for the ordinary skill in the art, can be according to specific feelings
Condition understands the concrete meaning of above-mentioned term in the present invention.
Embodiment
As shown in Figure 1, having used distant pump amplifying technique in the utility model, refer to molten in the appropriate location of transmission fiber 6
Enter Er-doped fiber 4, sends high-power pump light at 2 station of receiving end, inject Er-doped fiber after optical fiber transmission and wave multiplexer 5
4 and erbium ion is motivated, carries out route amplification.The difference is that pump light source is with gain media, (one section is mixed with conventional EDFA
Erbium optical fiber) it is located in the appropriate location in optical fiber link, because of referred to herein as distant pump (ROP, Remote Pump).Remote optical pumping amplifier
Including er-doped remote gain optical fiber 103, optical fiber wave multiplexer 108 and remotely pumping laser 107.It is needed using distant pump technology big
Power pump laser generallys use 980nm the or 1480nm laser of watt grade, to overcome the problems, such as that long-distance optical fiber is lost.Root
Whether transmitted in an optical fiber according to pump light and signal light, be divided into bypass and with two kinds of road, currently, general distant using bypassing
Pump, this requires to increase fiber number in the optical cable of both ends.
Distant pump gain unit is mounted on the appropriate location in optical cable 3, these points do not need power supply facilities, without maintenance,
It is suitable for passing through the environment in desert, plateau, lake, straits.It constituteing an inconvenience in that, it needs to cut off optical cable in position,
Er-doped fiber 4 is connected in series in original optical fiber, change amount of constructing and difficulty are larger.
As shown in Fig. 2, a kind of modified power communication ultra-long span two-way optical transmission system provided by the utility model:
Including transmitting-receiving bidirectional, quite due to both direction configuration, therefore a direction is only discussed herein.First enhanced forward error correction coding
Device 100, Raman's optical power amplifier 101, transmission fiber medium 102, er-doped remote gain optical fiber 103, preposition Er-doped fiber are put
Big device 104, dispersion compensation unit 105, adjustable attenuator 106, remotely pumping laser 107, optical fiber wave multiplexer 108 and second increase
Strong type forward error correction coder 110.Wherein: the first enhanced forward error correction encoder 100 and Raman's optical power amplifier 101
Connection, Raman's optical power amplifier 101 is distributed Raman amplifier, and one end of optical transmission device is arranged in.First enhancing
Type forward error correction coder 100 and the second enhanced forward error correction encoder 110 are for channel coding and in transmission line
The error correction of the coding of transmission；Raman's optical power amplifier 101 passes through transmission fiber medium 102 and er-doped remote gain optical fiber 103
Connection, er-doped remote gain optical fiber 103 belong to one section of gain fibre being connected in transmission fiber medium 102, and remotely pumping swashs
Laser is injected er-doped remote gain optical fiber 103 by optical fiber wave multiplexer 108 and motivates erbium ion, amplifying circuit light letter by light device 107
Number.Raman's optical power amplifier 101 and pumping laser er-doped remote gain optical fiber 103 are for improving optical signal in transmission line
Power；Optical fiber wave multiplexer 108 is connected to Pre-EDFA 104, preposition Erbium-doped fiber amplifier by transmission fiber
Device 104 is connect with dispersion compensation unit 105 again, for realizing the compensation of fibre-optical dispersion and chromatic dispersion gradient；Dispersion compensation unit 105
It is connect by adjustable attenuator 106 with the second enhanced forward error correction encoder 110, wherein Pre-EDFA
104, dispersion compensation unit 105, adjustable attenuator 106, the second enhanced forward error correction encoder 110 and remotely pumping laser
107 are arranged in the other end of optical transmission device.
Wherein, TX indicates to send, and RX indicates to receive.
Optimization, enhanced forward error correction encoder FEC technology has been used in the utility model, what ITU-T was proposed
G.707 with G.709 agreement, a kind of new channel coding formats-forward error correction FEC coding application optical fiber telecommunications system has been arrived into
In, it can effectively improve the reliability of signal in system, extend transmission distance.FEC technology is in transmitting terminal by number to be sent
It is believed that breath generates supervision symbol by certain rule encoding, the rule mutually system determined between symbol and information code element with certain is supervised
About.Then receiving end is decoded the sequence of symhols received by prespecified rule, when detecting the supervision symbol received in code character
When wrong, decoder just position to its mistake and error correction, can obtain coding gain in this way.The implementation of FEC has
Out-of-band FEC coding and in-band FEC encode two kinds.The gain of in-band FEC is generally 3dB or so, and the gain 7-9dB of out-of-band FEC
Much higher than in band, therefore, ultra long haul system is encoded using out-of-band FEC.FEC technology is used in optical transmission system, can be reduced
The bit error rate of system.Its coding gain provides certain system surplus capacity, thus reduce in optical link it is linear and it is non-linear because
Influence of the element to system performance, to improve the transmission range of system.
Optimization, Raman amplication technology has been used in the utility model.The mechanism of Raman's optical power amplifier, which is derived from, is excited
Raman scattering (SRS, Stimulated Raman Scattering) effect, i.e., when pump light is very strong, incident photon and medium
Interaction of molecules scatters, and incident photon can deviate under occurrence frequency in scattering process, therefore, infuses in transmission fiber
When entering the pump light of (such as 1440nm) lower than signal light frequency, since SRS can make the energy transfer of a part of pump light to letter
Above number light, here it is the mechanism of Raman amplifier.Why optical fiber Raman optical power amplifier, which can obtain negative noise, refers to
Number, is primarily due to it using optical fiber itself as gain media, signal realizes distributed amplification in transmission process.From changing
The noise figure of kind amplifier can effectively improve the signal-to-noise ratio of system, and the limit lowest noise index of EDFA is 3dB, and
Generally between -3-0dB, it can be improved more than 5-8dB route Raman's optical power amplifier equivalent noise figure for system
Amount.Raman's optical power amplifier is other than with relatively low equivalent noise figure, and there are two obvious features: first is that it
Gain media is exactly transmission fiber itself, and optical signal is distributed air-defense in transmission fiber rather than centralization amplification, therefore,
Effectively prevent nonlinear influence；Second is that the gain wavelength of amplifier is determined by pumping wavelength, as long as the suitable pumping of selection
Wavelength can theoretically amplify the signal light of any wavelength.This has the Transmission system of DWDM highly important
Meaning.
Optimization, Pre-EDFA has been used in the utility model, has been referred to after entering optical fiber by small signal,
A large amount of gain is obtained because rare earth ion (such as Er3+) returns ground state from first excited state transition, to realize optical signal
Amplification.In this process along with the Er3+ ion of spontaneous falling ground state, and then generate noise.Therefore, especially main to use
In the power amplifier for improving optical signal power, although gain is very high, correspondingly noise figure is also high.So this reality
Pre-EDFA is used with novel, receiving end is placed on, receiving sensitivity is provided, while realizing small gain, it is adjoint
Lesser noise figure.
It is described and illustrates below with reference to concrete engineering example: as shown in Figure 3.
The brief introduction of this example: 500KV transmission line of electricity, a kind of optical transport system with transmission line construction are netted by state, Tajikistan
System, wherein G.652 the system is laid with using optical cable, and optical link length is 353Km, and be completely averaged attenuation 0.20dB/Km.
(1) power budget
Route is averaged attenuation 0.20dB/Km, optical cable attenuation 70.6dB, under 2.5G rate, optical fiber Raman amplifier+distant pump
Amplifier, the receiving sensitivity of Pre-EDFA is -40dBm, due to being configured with remote optical pumping amplifier at 100Km,
10dB gain can be obtained again, and after configuring enhanced forward error correction encoder, coding gain is 7dB, so whole route is overall
Attenuation permissible value can be down to -57dBm, and optical fiber Raman optical power amplifier output power is 22dB, power attenuation limiting value 22-
(- 40)+10+7=79dB, surplus 79-70.6=8.4dB.
(2) dispersion compensation
The dispersion tolerance for supporting the enhanced forward error correction encoder of high power input is 80Km, line length 353Km,
Compensate 273Km dispersion compensation.
(3) OSNR budget
The minimum 20dB of OSNR design requirement of the system of 2.5Gb/s.Due to being configured with enhanced forward error correction coding gain
7dB, remote optical pumping amplifier gain 10dB, therefore, the practical minimum 3dB of OSNR design requirement of this section of route.This section of route is according to " 58 "
Formula OSNR=58+Pout-L-NF-logN, can be calculated: the > 3dB of OSNR=58+22-70.6- (- 1)=10.4,
It meets the requirements.Wherein, noise figure (NF) value -1dB, L of amplifier indicate the attenuation in span, Pout in above-mentioned formula
Indicate that, into optical fiber signaling optical power, logN indicates the total span number of system, i.e. Log1=0.
It is configured for this case history optical transmission system, builds 353Km optical transport environmental simulation test by laboratory and test
Card, it is as follows to measure ultra long haul optical transmission system key point power:
| Measurement point | Optical power value dBm | Remarks |
| A | 22.3 | The output of Raman's optical power amplifier |
| B | -18.0 | Remote optical pumping amplifier output |
| C | -4.0 | Pre-EDFA output |
| D | -13.5 | Forward error correction input |
System is attached measurement equipment, network detecting instrument and 2M BER tester to test 48 hours, test result is zero error code,
It achieves the desired results, which is feasible.
Finally, it should be noted that the above various embodiments is only to illustrate the technical solution of the utility model, rather than it is limited
System；Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should
Understand: it is still possible to modify the technical solutions described in the foregoing embodiments, or to some or all of
Technical characteristic is equivalently replaced；And these are modified or replaceed, it does not separate the essence of the corresponding technical solution, and this is practical new
The range of each embodiment technical solution of type.
Claims (7)
1. a kind of modified power communication ultra-long span two-way optical transmission system, it is characterised in that: including sending ending equipment, receive
End equipment and optical transmission device；
The sending ending equipment includes the first enhanced forward error correction encoder interconnected and Raman's optical power amplifier, institute
Show the first enhanced forward error correction encoder for channel coding and to the code correction transmitted in the optical transmission device, to change
The optical signal to noise ratio being apt in the optical transmission device, Raman's optical power amplifier are believed for improving light in the optical transmission device
Number power；
The receiving device include sequentially connected Pre-EDFA, dispersion compensation unit, adjustable attenuator with
And the second enhanced forward error correction encoder, the Pre-EDFA connect the optical transmission device and receive light letter
Number, the Pre-EDFA is used to improve the power of optical signal in the optical transmission device, the dispersion compensation list
Member to the dispersion compensation of optical signal in the optical transmission device, realizes fibre-optical dispersion and chromatic dispersion gradient using chirped fiber grating
Compensation, the adjustable attenuator receive light signal strength for adjusting, and the second enhanced forward error correction encoder is for believing
Road encodes and to the code correction transmitted in the optical transmission device；
The optical transmission device includes transmission fiber medium, the transmission fiber medium respectively with the Raman light power amplification
Device, Pre-EDFA connection, go here and there between the transmission fiber medium and Pre-EDFA connection
It is associated with remote optical pumping amplifier.
2. a kind of modified power communication ultra-long span two-way optical transmission system according to claim 1, it is characterised in that:
The remote optical pumping amplifier includes er-doped remote gain optical fiber, optical fiber wave multiplexer and remotely pumping laser, and the er-doped is long-range
Gain fibre is connected between the transmission fiber medium and Pre-EDFA, and the optical fiber wave multiplexer is connected on institute
It states between er-doped remote gain optical fiber and Pre-EDFA, the optical fiber wave multiplexer connects the remotely pumping laser
Device.
3. a kind of modified power communication ultra-long span two-way optical transmission system according to claim 2, it is characterised in that:
The transmission fiber medium, er-doped remote gain optical fiber and optical fiber wave multiplexer are Passive Optical Components.
4. according to a kind of described in any item modified power communication ultra-long span two-way optical transmission systems of Claims 2 or 3,
Be characterized in that: Raman's optical power amplifier is distributed Raman amplifier.
5. a kind of modified power communication ultra-long span two-way optical transmission system according to claim 4, it is characterised in that:
The both ends of the modified power communication ultra-long span two-way optical transmission system are connected separately with Synchronous Digital Hierarchy optical transmitter and receiver
SDH。
6. a kind of modified power communication ultra-long span two-way optical transmission system according to claim 5, it is characterised in that:
The transmission fiber medium 102 is ITU-T G.652 single mode optical fiber.
7. a kind of modified power communication ultra-long span two-way optical transmission system according to claim 6, it is characterised in that:
The rate of the optical signal transmitted in the modified power communication ultra-long span two-way optical transmission system be 155Mbps,
622Mbps, 2.5Gbps or 10Gbps.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114268367A (en) * | 2021-12-21 | 2022-04-01 | 国网甘肃省电力公司酒泉供电公司 | Multi-path power transmission method and system based on optical fiber combiner |
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2018
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114268367A (en) * | 2021-12-21 | 2022-04-01 | 国网甘肃省电力公司酒泉供电公司 | Multi-path power transmission method and system based on optical fiber combiner |
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| CP02 | Change in the address of a patent holder |
Address after: 210000 R&D Building, Block A, 15 Floors, No. 2 Lijing Road, Nanjing High-tech Zone, Jiangsu Province Patentee after: Jiangsu black horse hi tech Limited by Share Ltd Address before: 210000 R&D Building, Block A, 15 Floors, No. 2 Lijing Road, Yangzhou High-tech Zone, Jiangsu Province Patentee before: Jiangsu black horse hi tech Limited by Share Ltd |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: An improved ultra long distance bidirectional optical transmission system for power communication Effective date of registration: 20201022 Granted publication date: 20190416 Pledgee: Bank of Jiangsu Limited by Share Ltd. Nanjing Longjiang branch Pledgor: JIANGSU HIMARK HI-TECH Co.,Ltd. Registration number: Y2020980007066 |