CN104038287B - It is a kind of take on the spot can ultra long haul OPGW optical fiber telecommunications systems and its implementation - Google Patents

Abstract

The invention discloses an ultra-long-distance OPGW optical fiber communication system for obtaining energy on site and a realization method thereof, belonging to the technical field of electric power system communication. The ultra-long-distance OPGW optical fiber communication system of the present invention includes OPGW optical fiber and erbium-doped optical fiber amplifier, and a high-voltage energy-taking coil is set on the high-voltage transmission line, and the electromagnetic energy radiated by the high-voltage power line is converted by using the high-voltage energy-taking coil Obtain induced current for electric energy to supply power to the erbium-doped fiber amplifier, use a voltage stabilizing circuit to control the intensity of the induced current, and prevent strong electric shock; at the same time, use solar cells as a backup power supply; when the line failure occurs at night or in rainy days, the equipped battery Powers Erbium-Doped Fiber Amplifiers. The invention can reliably and effectively realize the ultra-long-distance communication problem of the OPGW optical fiber, and does not require additional power supply guarantee or additional building construction in the deployment process, and has strong anti-interference and harsh natural conditions.

Description

An ultra-long-distance OPGW optical fiber communication system and its implementation method for local energy harvesting

technical field

The invention belongs to the technical field of power system communication, and more precisely, the invention relates to a technology for signal amplification to realize optical fiber ultra-long-distance transmission.

Background technique

The optical fiber communication in the 330-500kV ultra-high voltage power grid adopts the overhead ground wire composite optical cable (OPGW optical cable). Conventional optical fiber without relay communication distance is generally 50-100km, after adding optical amplifiers at the sending end and receiving end, the transmission distance can reach 250-300km, theoretically 500km without relay transmission can be realized. Therefore, in order to achieve thousands of kilometers, or even thousands of kilometers of ultra-long-distance optical fiber communication, it is necessary to build a relay station for optical signal amplification. However, many places where the current UHV OPGW optical cable passes are located in sparsely populated deserts, Gobi, and high mountains. The natural conditions are extremely harsh, and it is difficult to build relay stations. Therefore, some UHV communication lines often need to be transferred through OPGWs of other voltage levels. This causes the communication line to be too long and the line reliability to decrease.

There has been practice of long-distance communication with OPGW optical cables in China (see: Sun Haipeng et al., Research on the Application of Relay Stations for UHV Ultra-Long-Distance Optical Transmission, Power System Communication, 2011, Volume 32, Issue 9). This technology uses a commercial erbium-doped fiber amplifier module, and places the amplifier and related control and detection equipment in the middle of the power tower. It is mainly powered by solar cells, supplemented by agricultural power, and equipped with batteries. However, this method cannot solve the power supply problem of equipment in uninhabited areas. At the same time, the reliability of power supply cannot be effectively guaranteed. Due to the unstable power supply of agricultural power, if the solar battery cannot provide power supply for a long time due to weather, the power of the battery will be exhausted, and eventually the communication will be interrupted. In addition, the total power consumption of the above technology is up to 800W, requiring larger solar battery packs and control equipment.

Erbium-doped fiber amplifiers have been successfully used in long-distance submarine cable communications, but the power supply for cascaded Erbium-doped fiber amplifiers must be provided by shore-based high-power power supplies.

The high-voltage energy harvesting coil (CT power harvesting device) has been used as a power source for monitoring equipment and information forwarding equipment for high-voltage transmission lines, and its output power is 5-20W.

Contents of the invention

The purpose of the present invention is: in order to solve the problem that the relay station cannot be built due to the limited conditions in the UHV OPGW optical fiber ultra-long-distance communication, and thus it is difficult to realize the relay amplification of optical signals, to provide a relay station that can be directly installed on the electric power tower without the construction of a relay station. , Provide low power consumption and reliable distributed power supply for erbium-doped fiber amplifiers through local energy harvesting (electromagnetic energy, solar energy, etc.) OPGW optical fiber communication system and its realization method.

Specifically, the ultra-long-distance OPGW optical fiber communication system of the present invention that obtains energy in situ is realized by adopting the following technical solutions: comprising OPGW optical fiber, erbium-doped optical fiber amplifier, and said erbium-doped optical fiber amplifier includes erbium-doped optical fiber, optical fiber Isolator, optical coupler, optical filter and pump laser; there are two optical isolators, the optical signal is input to one input end of the optical coupler through the OPGW fiber through the first optical isolator, and the other of the optical coupler The input terminal is connected to the pump laser output by the pump laser, the output terminal of the optical coupler is connected to the erbium-doped fiber, the erbium-doped fiber outputs the amplified signal, and the amplified signal is input to the optical filter for filtering through the second optical isolator, and the optical filter The output end of the optical isolator is fused with the OPGW optical fiber, and the direction of the two optical isolators is the same as the input direction of the optical signal; it also includes a battery, a high-voltage energy-taking coil, and a solar cell; The coil gets the induced current, and the induced current is input into the storage battery through the voltage stabilizing circuit; the solar cell also charges the storage battery at the same time; the storage battery supplies power for the pump laser.

The above technical solution is further characterized in that the pump laser is a 980nm laser, and the optical filter is a bandpass optical filter for filtering out 980nm light waves and other clutter.

The further feature of the above technical solution is that the optical isolator, optical coupler, optical filter and pump laser are installed in the OPGW optical cable splice box; on the iron tower.

And the realization method of the ultra-long-distance OPGW optical fiber communication system of obtaining energy on the spot of the present invention, comprises the following steps:

1) Install the first optical isolator at the input end of the OPGW fiber, and the direction of the optical isolator is the same as the input direction of the optical signal; then install an optical coupler at the output end of the first optical isolator, and the input The ends are respectively the optical signal to be amplified and the pump laser, the output of which is connected to the erbium-doped optical fiber; the pump laser is output by the pump laser, and the pump laser is a 980nm laser;

2) Connect the output of the erbium-doped fiber to the second optical isolator, and the direction of the optical isolator is the same as the input direction of the optical signal; then connect the output end of the second optical isolator to an optical filter to filter out 980 nm The optical wave and other clutter; the output end of the optical filter is fused with the OPGW fiber;

3) Install a high-voltage energy-taking coil on the high-voltage transmission line, use the high-voltage energy-taking coil to convert the electromagnetic energy radiated by the high-voltage wire into electrical energy to obtain an induced current to supply power for the pump laser, and use a voltage stabilizing circuit to control the intensity of the induced current to prevent strong electricity Shock; at the same time use solar cells as a backup power supply; when the line failure occurs at night or in rainy days, the equipped battery will power the pump laser.

The beneficial effects of the present invention are as follows: the present invention can reliably and effectively realize the ultra-long-distance communication problem of OPGW optical fiber, and is easy to deploy and manage, and each set of devices can provide 10dB~30dB gain (when the amplification gain is 10dB, it can reduce In the amplification process, the non-linear effect and the noise generated by itself can extend the communication distance by more than 40 kilometers; when the amplification gain is 30dB, the communication distance can be extended by more than 100 kilometers, but it will generate large spontaneous noise and optical fiber Non-linear effect affects the quality of communication. In practical applications, select the appropriate amplification gain according to the situation), and realize the long-distance transmission of optical signals by cascading multiple sets of devices. During its deployment, no additional power supply guarantee is required; no additional building construction is required; the ability to resist interference and harsh natural conditions is strong.

Description of drawings

Figure 1 is a graph of the relationship between EDFA signal gain and pump power.

Figure 2 is a schematic diagram of the present invention.

Fig. 3 is a schematic diagram of a scene realized by the present invention.

detailed description

The present invention will be described in further detail below with reference to the accompanying drawings and examples.

Figure 1 shows the relationship between the gain of the erbium-doped fiber amplifier (EDFA) and the pumping power and the optical power of the input signal. It can be seen from Figure 1 that since the transmission power of optical communication SDH equipment is between -2dBm and 3dBm, the sensitivity of the receiver is -28dBm, such as the signal gain is 10dB, and the pumping power is less than 30mW. Therefore, an erbium-doped fiber amplifier can be used to design a low-power online communication signal amplification device. Long-distance all-optical communication can be realized by cascading erbium-doped fiber amplifiers.

As shown in Figure 2, the ultra-long-distance OPGW optical fiber communication system of the present invention comprises OPGW optical fiber, erbium-doped fiber amplifier, and described erbium-doped fiber amplifier comprises erbium-doped fiber, optical isolator, optical coupler, optical filter and pump Pu laser, in which there are two optical isolators.

The optical signal is input to one input end of the optical coupler through the first optical isolator through the OPGW fiber, the other input end of the optical coupler is connected to the pump laser output by the pump laser, and the output end of the optical coupler is connected to the erbium-doped fiber , the erbium-doped fiber outputs the amplified signal, the amplified signal is input to the optical filter for filtering through the second optical isolator, the output end of the optical filter is fused with the OPGW optical fiber, and the direction of the two optical isolators is the same as the input direction of the optical signal .

The power supply of the pump laser comes from batteries, high-voltage coils and solar cells. The high-voltage energy-taking coil is arranged on the high-voltage transmission line, the induced current is obtained through the high-voltage energy-taking coil, and the induced current is input into the storage battery through the voltage stabilizing circuit. The solar cells also charge the battery at the same time. The battery powers the pump laser.

The pump laser is a 980nm laser. Correspondingly, the optical filter is a band-pass optical filter for filtering out 980nm light waves and other clutter.

The specific implementation process of the communication system is as follows:

1) Install the first optical isolator at the input end of the OPGW fiber, the direction of the optical isolator is the same as the input direction of the optical signal, and then install an optical coupler at the output end of the first optical isolator, the input of the optical coupler The ends are respectively the optical signal to be amplified and the pump laser, and the output is connected to the erbium-doped optical fiber. The pumping laser is output by the pumping laser.

2) Connect the output of the erbium-doped fiber to the second optical isolator, and the direction of the optical isolator is the same as the input direction of the optical signal; then connect the output end of the second optical isolator to an optical filter to filter out 980 nm The optical wave and other clutter; the output end of the optical filter is fused with the OPGW fiber.

3) Install a high-voltage energy-taking coil on the high-voltage transmission line, use the high-voltage energy-taking coil to convert the electromagnetic energy radiated by the high-voltage wire into electrical energy to obtain an induced current to supply power for the pump laser, and use a voltage stabilizing circuit to control the intensity of the induced current to prevent strong electricity shock. At the same time use solar cells as backup power. When the line failure occurs at night or in rainy days, the pump laser will be powered by the equipped storage battery.

Fig. 3 is a schematic diagram of an implementation scenario of the present invention. As shown in Figure 3, the erbium-doped optical fiber (constituting the optical cable) and the redundant optical cable of OPGW are reeled on the power tower; solar panels are installed in the direction of the sun; On the power tower; optical components such as optical couplers, optical isolators, pump lasers, and optical filters are installed in the OPGW optical cable splice box.

The invention utilizes a high-voltage energy-taking coil and a solar cell to supply power for the erbium-doped optical fiber amplifier, thereby realizing the deployment of the optical fiber amplifier on the same tower. Since the signal amplifying unit of the present invention uses passive components, it has the advantages of low power consumption, anti-electromagnetic interference, adaptability to harsh environments, and the like. The invention can facilitate deployment, reduce construction cost and management difficulty, and essentially improve the reliability of long-distance OPGW communication.

Although the present invention has been disclosed above with preferred embodiments, the embodiments are not intended to limit the present invention. Any equivalent changes or modifications made without departing from the spirit and scope of the present invention also belong to the protection scope of the present invention. Therefore, the scope of protection of the present invention should be based on the content defined by the claims of this application.

Claims (2)

1. it is a kind of take on the spot can ultra long haul OPGW optical fiber telecommunications systems, including OPGW optical fiber, cascade many set Er-doped fibers put Big device, it is characterised in that：

The erbium-doped fiber amplifier includes Er-doped fiber, optoisolator, photo-coupler, optical filter and pump laser；Light Isolator has two, and optical signal is input to an input of photo-coupler, light through OPGW optical fiber by first optoisolator The pumping laser of another input termination pump laser output of coupler, the output termination Er-doped fiber of photo-coupler is mixed Erbium optical fiber output amplified signal, amplified signal is input to optical filter by second optoisolator and is filtered, optical filter Output end and OPGW fused fiber splices, the direction of two optoisolators is identical with optical signal input direction；

Also include battery, high pressure taking energy coil, solar cell；High pressure taking energy coil is arranged on high voltage transmission line, is passed through High pressure taking energy coil obtains induced-current, and induced-current inputs battery by mu balanced circuit；Solar cell is also simultaneously storage Battery charges；Battery is powered for pump laser；

The pump laser is 980 nano lasers, and the optical filter is bandpass optical filtering device, for filtering out 980 nanometers Light wave and other clutters；

The optoisolator, photo-coupler, optical filter and pump laser are arranged in OPGW cable splice closures；The high pressure Taking energy coil, solar cell, battery, all on same electric power tower；

The gain of the erbium-doped fiber amplifier is 10dB or 30dB, and the communication distance of extension is 40 or 100 kilometers.

2. it is a kind of take on the spot can ultra long haul OPGW optical fiber telecommunications system implementation methods, it is characterised in that comprise the following steps：

1）First optoisolator, direction and the optical signal input direction phase of optoisolator are installed additional in the input of OPGW optical fiber Together；Photo-coupler is installed additional in the output end of first optoisolator, photo-coupler input is respectively the light letter for needing to amplify again Number and pumping laser, its export access Er-doped fiber；Pumping laser is exported by pump laser, and the pump laser is 980 Nano laser；

2）The output of Er-doped fiber is accessed into second optoisolator, the direction of optoisolator is identical with optical signal input direction； The output end of second optoisolator is accessed into optical filter again, 980 nanometers of light wave and other clutters is filtered out；Optical filter Output end and OPGW fused fiber splices, so as to obtain erbium-doped fiber amplifier；The gain of erbium-doped fiber amplifier is 10dB or 30dB, The communication distance of extension is 40 or 100 kilometers；

3）High pressure taking energy coil, the electromagnetic energy for being radiated high-tension bus-bar using high pressure taking energy coil are set on high voltage transmission line It is converted into electric energy acquisition induced-current to power for pump laser, faradic intensity, overcurrent proof is controlled using mu balanced circuit Impact；Battery is equipped with, induced-current inputs battery by mu balanced circuit, and battery is powered for pump laser；Make simultaneously With solar cell as stand-by power supply, solar cell is also simultaneously battery charging, when line outage occurred at night Between or it is overcast and rainy when, powered by the battery being equipped with for pump laser；The optoisolator, photo-coupler, optical filter and Pump laser is arranged in OPGW cable splice closures；The high pressure taking energy coil, solar cell, battery, are all arranged on On same electric power tower；

The many set erbium-doped fiber amplifiers of cascade, realize long range all optical communication.