A passive optical fiber communication principle teaching experiment box

Abstract

The present invention discloses a passive optical fiber communication principle teaching experiment box, including a main box body and a cover plate for sealing the main box body; the optical module components embedded in the main box body include G.652 standard single-mode optical fiber, G.655 standard single-mode optical fiber, multi-mode optical fiber, SC / FC connector, variable optical attenuator, 1:4 optical splitter, combiner, splitter, optical isolator, light source module and optical power meter, and the panel of the main box is divided into four functional areas: optical fiber test functional area, optical passive device test functional area, accessories and consumables placement area and transmission and reception area. The modular design and project distribution are reasonable, and the layout of the test functional area of ​​the experiment box strives to have the least instruments and meters, and realizes a reasonable layout of short connection lines, few adapters and combinations. The experiment box platform is easy to operate, has many projects, covers many knowledge points, and one experiment box can do multiple experiments, with high integration and low cost.

Description

Technical Field

[0001] The invention relates to a passive optical fiber communication principle teaching experiment box. Background Art

[0002] Optical fiber communication is a communication system that uses light as carrier, optical fiber as transmission medium, and optical terminal to transmit information. In the 21st century, optical fiber communication has become the most important strategic industry. The main media, optical communication system and passive devices in the optical fiber communication system are particularly important. It is not easy for students to understand and remember when teachers explain the composition, performance and characteristics of transmission medium optical fiber and optical passive devices. In order to enable students to quickly and deeply master this part of knowledge, experimental teaching is required. However, the current optical fiber communication principle or system experimental box or platform has the disadvantages of difficult operation, few projects, and few knowledge points. One device can generally only do one experiment, resulting in the introduction of more experimental equipment, taking up space, high cost, and not conducive to students' systematic learning. There is a lack of a device that integrates multiple basic optical fiber communication experimental equipment. Summary of the invention

[0003] The purpose of the present invention is to provide a passive optical fiber communication principle teaching experiment box to solve the technical problems in the prior art that the optical fiber communication principle or system experiment box or platform is difficult to operate, has few projects, and covers few knowledge points. Generally, one device can only do one experiment, resulting in the introduction of a large number of experimental equipment and high costs.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A passive optical fiber communication principle teaching experiment box, comprising a main box body and a cover plate for sealing the main box body; the optical module components embedded in the main box body include G.652 standard single-mode optical fiber, G.655 standard single-mode optical fiber, multi-mode optical fiber, SC / FC connector, variable optical attenuator, 1:4 optical splitter, combiner, splitter, optical isolator, light source module and optical power meter, and each optical module component is independent of each other;

[0006] The panel of the main box is divided into four functional areas: optical fiber test functional area, optical passive device test functional area, accessories and consumables placement area, and transmission and reception area; wherein, the optical fiber test functional area includes two reels of G.652 standard single-mode optical fiber and two reels of G.655 standard single-mode optical fiber, and a reel of multi-mode optical fiber with a length of 5km. The G.652 standard single-mode optical fiber and the G.655 standard single-mode optical fiber are both 5km and 15km, respectively. The left side of each reel of optical fiber is the input port and the right side is the output port, both of which are FC connectors; the optical passive device test functional area includes SC / FC connectors, variable optical attenuators, 1:4 splitters, combiners, demultiplexers, and optical isolators; the four functional areas of the receiving area include light source modules and optical power meters, and the connectors of each optical module component are set on the panel.

[0007] The present invention adopts modular design and reasonable project distribution. The teaching experiment box is divided into four major functional test areas, namely, optical fiber test functional area, optical passive device test functional area and optical terminal performance index. The layout of the experimental box in the test functional area strives to minimize the number of instruments and meters, and realizes a reasonable layout in terms of short connection lines, few adapters and combinations. The experimental content and function modularize the optical fiber communication teaching experiment, and each module is independently designed, which can be conveniently combined to carry out unit experiments and optical fiber communication system experimental projects. The input and output optical interfaces or optical connecting lines of the experimental modules are concavely designed and plug-in installed to reduce adapter components, reduce experimental errors and improve the accuracy of the experiment. The experimental project assembly is used to enhance the operator's knowledge understanding and consolidation. The experimental box platform is easy to operate, has many projects, covers many knowledge points, and can do multiple experiments in one experimental box, with high integration and low cost.

[0008] As a further improvement, the upper end of the main box body near the panel side has a slide groove on the inner wall of the two opposite sides, and the two ends of the cover plate are correspondingly movably clamped in the slide groove and can slide along the slide groove, which is convenient for closing the main box body and is easy to operate. The back of the cover plate is painted with experimental steps and precautions, as well as a QR code, which can be scanned with a mobile phone to watch the experimental operation video.

[0009] As a further improvement, at least one first through hole is provided on the cover plate, and a corresponding second through hole is provided at a corresponding position on the panel. After the cover plate is closed, the first through hole and the second through hole are coaxial, and positioning pins are inserted through the first through hole and the second through hole. By providing a limit pin, the cover plate is prevented from accidentally falling off after closing. A handle is provided on the main box body for easy transportation.

[0010] As a further improvement, an optical fiber receiving device is provided under each FC optical connector, and the optical fiber receiving device includes a ratchet, a pawl, a connecting rod and a bracket. The upper end of the bracket is fixedly connected to the bottom surface of the panel, and the lower end of the bracket is fixedly connected to the rotating shaft. The ratchet is rotatably sleeved on the rotating shaft through a coil spring, and the pawl is rotatably set on the bracket through a torsion spring. The connecting rod is movably set through the panel, and a section of the connecting rod located above the panel is sleeved with a spring, and the lower end of the connecting rod is located above the end of the pawl away from the rotation point. When the upper end of the connecting rod is pressed, the pawl can engage with the ratchet after rotation.

[0011] The optical fiber receiving device can be experimentally in three states: stretching, self-locking and recycling. One end of the optical fiber is connected to the FC connector, and the ratchet pendulum principle is used to achieve the stretching, self-locking and recycling of the FC optical fiber connector. When the FC optical fiber connector is stretched, the ratchet rotates clockwise, and the upper end of the connecting rod is pressed to make it drop to the left side, and the lower end of the connecting rod presses the ratchet, then the ratchet rotates, so that the ratchet is in close contact with the gear, and the optical fiber is released; in the self-locking state, the ratchet tends to rotate counterclockwise under the restoring force of the torsion spring and the ratchet under the rewinding force of the high-elastic coil spring, and the ratchet and the ratchet slot match, and the ratchet is used to offset the pulling force to achieve the anti-reversal effect of the ratchet; in the recovery state, by pressing the connecting rod, under the action of the spring restoring force, the connecting rod bounces up and rises, then the ratchet and the ratchet slot are disengaged, and under the action of the restoring force of the coil spring, the ratchet rotates counterclockwise, so that the optical fiber is wound around the roller of the ratchet, and then the upper end of the connecting rod is pressed again to make it drop to the left side, and the lower end of the connecting rod presses the ratchet, then the ratchet rotates, so that the ratchet is in close contact with the gear, and the ratchet and the gear slot match and achieve a locked state.

[0012] As a further improvement, the light source module includes four FC flange output ports and an adjustable amplitude display screen arranged on the panel. The four output ports respectively provide four optical signals of different wavelengths with adjustable amplitudes, and the wavelengths are 850nm, 1310nm, 1550nm and 1625nm respectively, and are equipped with four 1.5-meter jumper fibers. The adjustable amplitude display screen can display the frequency and amplitude of the optical signal with an accuracy of two decimal places.

[0013] Further improvement, the optical power meter is used to test the optical power of four bands, including four FC flange input ports and a display screen set on the panel, the display screen can display the frequency and amplitude of the optical signal with two decimal places of accuracy. Configure a four-choice optical switch to enter the optical power meter, reduce the number of optical power meters and test the function of the optical switch.

[0014] As a further improvement, a spare card slot is provided on the panel for configuring a fixed telephone, an optical transmitter, a bit error meter and an optical receiver according to experimental requirements, so as to complete the test of the main performance indicators of the average optical power and extinction ratio of the optical transmitter, and the dynamic range and sensitivity of the optical receiver.

[0015] As a further improvement, each FC connector is embedded in a groove and protected by a dust cap.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1) A passive optical fiber communication teaching experiment box consists of a main box and a sliding cover. A card slot is left on the upper part of the main box, and the sliding cover is embedded in the main box through the right card slot and protected by a limit pin. The back of the sliding cover has experimental steps and precautions and a QR code operation video. The main box has a handle. The experimental box achieves high safety and reliability, and displays the product in an informationized manner.

[0018] 2) The patent of this invention adopts modular design and reasonable project distribution. The teaching experiment box is divided into four functional test areas: optical fiber test functional area, optical passive device test functional area and optical terminal performance index. The layout of the experimental box in the test functional area strives to have the least instruments and meters, and realizes a reasonable layout with short connection lines, few adapters and combinations.

[0019] 3) Experimental content and functions The fiber-optic communication teaching experiment is designed in a modular way, and each module is designed independently, which can be easily combined to carry out unit experiments and fiber-optic communication system experimental projects.

[0020] 4) The input and output optical interfaces or optical connecting lines of the experimental modules are all designed with concave shape and plug-in installation, which reduces the number of adapters, reduces experimental errors, and improves the accuracy of the experiment. The experimental project assembly is used to enhance the operator's knowledge understanding and consolidation.

[0021] 5) The design of the experimental box is closely linked to the optical fiber communication technology and system-related teaching materials, and is an ideal practical teaching tool for optical fiber communication technology experimental teaching.

[0022] 6) Based on the fiber optic communication technology and applications, the patent of this invention facilitates the development of experimental projects and realizes the scalability of the experimental box through standardized modular standards.

[0023] 7) There is a fiber optic receiving device under each module, which has the functions of telescopic and locking to protect the safety of the fiber optic connector. The fiber optic cable receiving device is composed of a ratchet, a pawl assembly, a high-elastic coil spring and a ratchet receiving disk. The fiber optic cable receiving device is in three states: stretching, self-locking and recovery. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a top view of the passive optical fiber communication principle teaching experiment box described in the present invention.

[0025] Figure 2 This is the right side view of the main box and sliding cover.

[0026] Figure 3 The test block diagram.

[0027] Figure 4 This is the structural diagram of the 5FC optical fiber storage device. DETAILED DESCRIPTION

[0028] In order to make the purpose and technical solution of the present invention more clear, the technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention.

[0029] like Figure 1-4 As shown, a passive optical fiber communication principle teaching experiment box includes a main box body 1 and a cover plate 2 for covering the main box body; the optical module components embedded in the main box body 2 include G.652 standard single-mode optical fiber, G.655 standard single-mode optical fiber, multi-mode optical fiber, SC / FC connector, variable optical attenuator, 1:4 splitter, combiner, demultiplexer, optical isolator, light source module and optical power meter, and each optical module component is independent of each other.

[0030] In this embodiment, the upper end of the main box body 1 close to the panel side and the inner walls of the two opposite side panels are provided with a slide groove 5, and the corresponding movable cards at both ends of the cover plate 2 are arranged in the slide groove 5 and can slide along the slide groove, which is convenient for covering the main box body and is easy to operate. The back of the cover plate 2 is painted with experimental steps and precautions, as well as a QR code, and the experimental operation video can be viewed by scanning the QR code with a mobile phone.

[0031] In this embodiment, the cover plate is provided with two first through holes, and the corresponding positions on the panel are provided with corresponding second through holes 6. After the cover plate 2 is closed, the first through holes and the second through holes are coaxial, and positioning pins 7 are inserted through the first through holes and the second through holes. By providing a limit pin, the cover plate is prevented from accidentally falling off after closing. A handle 3 is provided on the main box body for easy transportation.

[0032] The panel of the main box 1 is divided into four functional areas: optical fiber test functional area, optical passive device test functional area, accessories and consumables placement area, and transmission and reception area; wherein, the optical fiber test functional area includes two reels of G.652 standard single-mode optical fiber and two reels of G.655 standard single-mode optical fiber, and a reel of multi-mode optical fiber with a length of 5km. The G.652 standard single-mode optical fiber and the G.655 standard single-mode optical fiber are both 5km and 15km, respectively. The left side of each reel of optical fiber is the input port and the right side is the output port, both of which are FC connectors 4; the optical passive device test functional area includes SC / FC connectors, variable optical attenuators, 1:4 splitters, combiners, demultiplexers, and optical isolators; the four functional areas of the receiving area include light source modules and optical power meters, and the connectors of each optical module component are set on the panel, such as Figure 1 shown.

[0033] The light source module generates optical signals of four wavelengths and different amplitudes to meet the needs of optical fiber communication teaching experiment projects. The wavelengths are 850nm, 1310nm, 1550nm and 1625nm, and the optical power amplitude is 0-0.5W. The amplitude of the four wavelengths is adjusted by the amplitude knob and output through the four-way FC flange. At the same time, the plane of the right side of the flange is lower than the left side, and the height of the FC connector 4 flange plus the dust cap is the same as the height on the left side.

[0034] The middle of the main box is divided into two parts, the upper part and the lower part. The upper part is the optical passive device test area, which can complete the FC / SC connector test, optical attenuator test, 1:4 splitter, optical isolator, combiner and splitter and optical opening test. Each test input and output port is a square concave interface, and a 1.5-meter FC optical connector is placed in the concave area. There is an optical fiber storage device under each module, which has the function of telescopic and locking to protect the safety of the optical fiber connector. The optical fiber storage device includes a ratchet 8, a pawl 9, a connecting rod 11 and a bracket 10. The upper end of the bracket 10 is fixedly connected to the bottom surface of the panel, and the lower end of the bracket is fixedly connected to the rotating shaft. The ratchet is rotatably sleeved on the rotating shaft through a coil spring, and the pawl is rotatably set on the bracket through a torsion spring. The connecting rod is movably set through the panel, and a spring 12 is sleeved on a section of the connecting rod located above the panel. The lower end of the connecting rod is located above the end of the pawl away from the rotation point. Pressing the upper end of the connecting rod, the pawl can engage with the ratchet after rotation.

[0035] The optical fiber receiving device can be experimentally in three states: stretching, self-locking and recycling. One end of the optical fiber is connected to the FC connector, and the ratchet pendulum principle is used to achieve the stretching, self-locking and recycling of the FC optical fiber connector. When the FC optical fiber connector is stretched, the ratchet rotates clockwise, and the upper end of the connecting rod is pressed to make it drop to the left side, and the lower end of the connecting rod presses the ratchet, then the ratchet rotates, so that the ratchet is in close contact with the gear, and the optical fiber is released; in the self-locking state, the ratchet tends to rotate counterclockwise under the restoring force of the torsion spring and the ratchet under the rewinding force of the high-elastic coil spring, and the ratchet and the ratchet slot match, and the ratchet is used to offset the pulling force to achieve the anti-reversal effect of the ratchet; in the recovery state, by pressing the connecting rod, under the action of the spring restoring force, the connecting rod bounces up and rises, then the ratchet and the ratchet slot are disengaged, and under the action of the restoring force of the coil spring, the ratchet rotates counterclockwise, so that the optical fiber is wound around the roller of the ratchet, and then the upper end of the connecting rod is pressed again to make it drop to the left side, and the lower end of the connecting rod presses the ratchet, then the ratchet rotates, so that the ratchet is in close contact with the gear, and the ratchet and the gear slot match and achieve a locked state.

[0036] The lower part of the main box is the fiber parameter test area, which mainly completes the test of transmission performance such as fiber length, attenuation, and attenuation coefficient. It is mainly composed of three fiber bare fiber test trays. G.652 standard single-mode fiber and G.655 standard single-mode fiber are each 5km and 15km, and a multi-mode fiber with a length of 5km. The left input and right output of each fiber tray are FC connectors. Single-mode fiber has two input lines and two output lines. Its input and output connectors are embedded in the groove of the module. There is a fiber optic receiving device under each module, which has the function of telescopic and locking to protect the safety of the fiber optic connector and use dust cap protection. Multi-mode fiber has one input line and one output line. Its input and output connectors are embedded in the groove of the module. It has the function of telescopic and locking to protect the safety of the fiber optic connector and use dust cap protection. This area completes the test of single-mode 5km and 15km lengths and multi-mode fiber 5km fiber test. Each optical passive test module is fixed in the card slot by two upper and lower knobs (with springs). At the same time, the standard system of optical modules is unified, which is convenient for optical module expansion and assembly networking.

[0037] like Figure 3 As shown, the panel is provided with a spare card slot, which can be used to configure a fixed telephone, an optical transmitter, a bit error tester and an optical receiver according to the experimental requirements, and complete the test of the main performance indicators of the average optical power and extinction ratio of the optical transmitter, the dynamic range and sensitivity of the optical receiver. It is conducive to the secondary development and expansion training of the project.

[0038] Anything not specifically described in the present invention is prior art or can be implemented by prior art, and the specific implementation cases described in the present invention are only preferred implementation cases of the present invention, and are not intended to limit the scope of implementation of the present invention. That is, all equivalent changes and modifications made according to the content of the patent application scope of the present invention should be regarded as the technical scope of the present invention.

Claims

1. A passive optical fiber communication principle teaching experiment box, characterized in that: It includes a main box and a cover plate for sealing the main box; the optical module components embedded in the main box include G.652 standard single-mode optical fiber, G.655 standard single-mode optical fiber, multi-mode optical fiber, SC / FC connector, variable optical attenuator, 1:4 splitter, combiner, splitter, optical isolator, light source module and optical power meter, and each optical module component is independent of each other; The panel of the main box is divided into four functional areas: optical fiber test functional area, optical passive device test functional area, accessories and consumables placement area, and transmission and reception area; wherein, the optical fiber test functional area includes two reels of G.652 standard single-mode optical fiber and two reels of G.655 standard single-mode optical fiber, and one reel of multi-mode optical fiber with a length of 5km, and one reel of G.652 standard single-mode optical fiber and one reel of G.655 standard single-mode optical fiber with a length of 5km and 15km respectively, and the left side of each reel of optical fiber is the input port and the right side is the output port, and the input port and the output port are both FC connectors; the optical passive device test functional area includes SC / FC connectors, variable optical attenuators, 1:4 splitters, combiners, demultiplexers, and optical isolators; the four functional areas of the receiving area include light source modules and optical power meters, and the connectors of each optical module component are set on the panel; The upper end of the main box body close to the panel side has slide grooves on the inner walls of the two opposite side panels, and the two ends of the cover plate are correspondingly movably clamped in the slide grooves and can slide along the slide grooves; The cover plate is provided with at least one first through hole, and a corresponding second through hole is provided at a corresponding position on the panel. After the cover plate is closed, the first through hole and the second through hole are coaxial, and positioning pins are inserted through the first through hole and the second through hole. A handle is provided on the main box body; An optical fiber receiving device is provided under each FC optical connector, and the optical fiber receiving device includes a ratchet, a pawl, a connecting rod and a bracket. The upper end of the bracket is fixedly connected to the bottom surface of the panel, and the lower end of the bracket is fixedly connected to the rotating shaft. The ratchet is rotatably sleeved on the rotating shaft through a coil spring, and the pawl is rotatably set on the bracket through a torsion spring. The connecting rod is movably set through the panel, and a section of the connecting rod located above the panel is sleeved with a spring. The lower end of the connecting rod is located above the end of the pawl away from the rotating point. When the upper end of the connecting rod is pressed, the pawl can engage with the ratchet after rotating; The optical fiber receiving device can be experimentally in three states: stretching, self-locking, and recycling. One end of the optical fiber is connected to the FC connector, and the ratchet pendulum principle is used to realize the stretching, self-locking, and recycling of the FC optical fiber connector. When the FC optical fiber connector is stretched, the ratchet rotates clockwise, and the upper end of the connecting rod is pressed to make it drop to the left side. The ratchet is pressed by the lower end of the connecting rod, and the ratchet rotates to make the ratchet closely contact with the gear, thereby realizing the release of the optical fiber. In the self-locking state, the ratchet has a counterclockwise return under the restoring force of the torsion spring and the ratchet has a counterclockwise return under the rewinding force of the high-elastic coil spring. In the recovery state, by pressing the connecting rod, the connecting rod bounces up and rises under the restoring force of the spring, and the pawl and the ratchet slot are disengaged. Under the restoring force of the coil spring, the ratchet rotates counterclockwise, so that the optical fiber is wound around the drum of the ratchet. Then, the upper end of the connecting rod is pressed again to make it drop to the left side. The lower end of the connecting rod presses the pawl, and the pawl rotates, so that the pawl is in close contact with the gear, and the pawl and the gear slot are matched to achieve a locked state. The lower part of the main box is the fiber parameter test area, which completes the test of fiber length, attenuation, and attenuation coefficient transmission performance. G.652 standard single-mode fiber and G.655 standard single-mode fiber are each 5km and 15km one reel, and a multi-mode fiber with a length of 5km. The left input and right output of each fiber reel are FC connectors; single-mode fiber has two input lines and two output lines, and its input and output connectors are embedded in the groove of the module. There is a fiber optic receiving device under each module, which has the function of telescopic and locking to protect the safety of the fiber optic connector and is protected by dust caps; multi-mode fiber has one input line and one output line, and its input and output connectors are embedded in the groove of the module, which has the function of telescopic and locking to protect the safety of the fiber optic connector and is protected by dust caps; this area completes the test of single-mode 5km and 15km two lengths and multi-mode fiber 5km fiber test; each optical passive test module is fixed in the card slot by two upper and lower knobs, and the optical module standard system is unified, which is convenient for optical module expansion and assembly networking.

2. The passive optical fiber communication principle teaching experiment box according to claim 1 is characterized in that: The light source module includes four FC flange output ports and an adjustable amplitude display screen arranged on the panel. The four output ports respectively provide four optical signals of different wavelengths with adjustable amplitudes, and the wavelengths are 850nm, 1310nm, 1550nm and 1625nm respectively, and are equipped with four 1.5-meter jumper fibers. The adjustable amplitude display screen can display the frequency and amplitude of the optical signal with an accuracy of two decimal places.

3. The passive optical fiber communication principle teaching experiment box according to claim 2 is characterized in that: The optical power meter is used to test the optical power of four bands, and comprises four FC flange input ports and a display screen arranged on a panel. The display screen can display the frequency and amplitude of the optical signal with an accuracy of two decimal places.

4. The passive optical fiber communication principle teaching experiment box according to claim 3 is characterized in that: The panel is provided with a spare card slot for configuring a fixed telephone, an optical transmitter, a bit error meter and an optical receiver according to experimental requirements, and completing the test of the main performance indicators of the average optical power and extinction ratio of the optical transmitter, and the dynamic range and sensitivity of the optical receiver.

5. The passive optical fiber communication principle teaching experiment box according to claim 4 is characterized in that: Each FC connector is embedded in a groove and protected by a dust cap.

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