Optical communication module based on plastic optical fiber

Abstract

An optical communication module based on plastic optical fibers comprises an optical fiber single-transmitting module, a relay module, an optical fiber single-receiving module and transmitting and receiving plastic optical fibers, a first light emitting diode is arranged in a single-transmitting chip in the optical fiber single-transmitting module, and a first photodiode and a second light emitting diode are correspondingly arranged in a left chip and a right chip in the relay module. A photodiode B is arranged in a single receiving chip in the optical fiber single receiving module; the first light-emitting diode is in light path connection with one end of a first photodiode through a light-emitting plastic optical fiber, and the other end of the first photodiode is connected with one end of a second light-emitting diode after sequentially passing through a pin of a middle-left chip, a relay circuit and a pin of a middle-right chip. And the other end of the light emitting diode B is in light path connection with the photodiode B through the plastic optical fiber. According to the design, multi-node short-distance stable high-speed industrial communication can be carried out, the cost performance is high, and the design has important significance on industrial data communication and control networks, especially industrial 4.0 upgrading.

Description

Technical Field

[0001] This utility model relates to a communication module, belonging to the field of optical fiber communication, and particularly to an optical communication module based on plastic optical fiber, specifically applicable to optical communication modules using visible light communication. Background Technology

[0002] Traditional industrial data communication often uses TTL high and low level signals on metal wires and 485 serial communication. TTL level signals often use parallel communication and transmit multiple data at once, which results in a large wiring harness. At the same time, metal wire communication is prone to common-mode interference, has low transmission efficiency, and is also weak in resisting electromagnetic interference. Therefore, fiber optic communication has emerged. Fiber optic communication not only has a large transmission capacity but also strong resistance to electromagnetic interference.

[0003] Current fiber optic communication modules primarily utilize infrared bands of 1310 / 1550 / 1650nm, all of which are high-speed, long-distance communication modules, and all employ quartz optical fiber as the communication medium. However, the demands of industrial data communication extend beyond long-distance communication to include numerous short-distance communication scenarios, especially those with a large number of nodes, such as local area network control. This places new demands on fiber optic communication. Existing quartz optical fiber not only results in relatively high prices for optical communication modules (requiring expensive auxiliary equipment such as dedicated light sources, optical power meters, and fiber optic fusion splicers during engineering construction and installation), but also suffers from poor bending radius and toughness, making it inefficient for short-distance industrial communication control, particularly unsuitable for short-distance industrial communication with a large number of nodes.

[0004] Patent application CN200580001547.2, filed on June 17, 2005, discloses a linear repeater and optical fiber communication system using front-excited DRA. The optical fiber communication system includes: a silica optical fiber serving as the Raman amplification gain medium for amplifying signal light; an excitation source for outputting excitation light, which propagates in the silica optical fiber along the same direction as the signal light; and a combiner for the signal light and the excitation light disposed between the silica optical fiber and the excitation source. The combiner includes means for combining the incident signal light with a wavelength longer than the zero-dispersion wavelength of the silica optical fiber and the excitation light emitted from the excitation source. The excitation source has means for emitting excitation light, which is located on the short-wavelength side of the low-frequency side, with a frequency difference of 13.7 THz to 30 THz compared to the wavelength of the signal light. Although this design can solve the defects of RIN migration and optical signal quality degradation caused by NO-FWM in the existing technology, it still has the following defects:

[0005] The optical fiber communication in this design is limited to quartz optical fiber as the communication medium. This cannot overcome the shortcomings of its high application cost and poor mechanical performance, resulting in a low cost-performance ratio when conducting multi-node short-distance industrial communication.

[0006] The information disclosed in this background section is intended only to enhance understanding of the overall background of this application and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0007] The purpose of this invention is to overcome the problem of low cost-effectiveness in multi-node short-distance industrial communication in the prior art, and to provide a cost-effective optical communication module based on plastic optical fiber for multi-node short-distance industrial communication.

[0008] To achieve the above objectives, the technical solution of this utility model is: an optical communication module based on plastic optical fiber; the optical communication module includes a single-transmit optical fiber module, a repeater module, a single-receive optical fiber module, a transmitting plastic optical fiber, and a receiving plastic optical fiber;

[0009] The fiber optic single-transmit module includes a single-transmit chip, a transmitter resistor, a transmitter resistor, a transmitter resistor, a transmitter transistor, and a transmitter transistor. The single-transmit chip contains an LED (Light Emitting Diode A). The positive and negative terminals of the LED are connected to the pins of the single-transmit chip. Pin 1 of the single-transmit chip is grounded. Pins 2, 3, and 4 are simultaneously connected to the inner terminals of the transmitter resistor. Pin 5 is connected to the inner terminal of the transmitter resistor. The outer terminals of both the transmitter resistor and the transmitter resistor are connected to an external power supply. The inner terminal of the transmitter resistor is connected to the collector of the transmitter transistor. The emitter of the transmitter transistor is grounded. The base of the transmitter transistor is connected to the outer terminal of the transmitter resistor and the collector of the transmitter transistor. The inner terminal of the transmitter resistor is connected to an external power supply. The emitter of the transmitter transistor is grounded. The base of the transmitter transistor is connected to the inner terminal of the transmitter resistor. The outer terminal of the transmitter resistor is connected to the TXD signal.

[0010] The relay module includes a relay circuit and a left-center chip and a right-center chip connected to its two ends. The left-center chip has a photodiode A inside, and the right-center chip has a light-emitting diode B inside. The fiber optic single-receiver module includes a single-receiver chip, which has a photodiode B inside.

[0011] The first light-emitting diode (LED) is optically connected to one end of the transmitting plastic optical fiber, and the other end of the transmitting plastic optical fiber is optically connected to one end of the first LED. The other end of the first LED is then connected to one end of the second LED after passing through the pins of the left-middle chip, the relay circuit, and the right-middle chip. The other end of the second LED is optically connected to one end of the receiving plastic optical fiber, and the other end of the receiving plastic optical fiber is optically connected to one end of the second LED. The other end of the second LED is then connected to the RXD signal after passing through the pins of the single receiving chip.

[0012] The positive terminal of LED A is connected to pin 5 of the single-chip, and the negative terminal of LED A is connected to pins 1 and 4 of the single-chip.

[0013] The base of transistor 1 is connected to the outer end of resistor 5 and resistor 3, and the collector of transistor 2. The base of transistor 2 is connected to the inner end of resistor 4 via resistor 6. The connection between the base of transistor 2 and resistor 6 is connected to the emitter of transistor 2 via resistor 7.

[0014] The outer end of the four-resistor is connected to pin 3 on the serial port chip, pin 4 on the serial port chip is connected to the TXD signal, pin 1 on the serial port chip is connected to the external power supply, and pin 2 on the serial port chip is grounded.

[0015] The fiber optic single-receiver module also includes a receive-1 resistor, a receive-2 resistor, a receive-3 resistor, a receive-1 diode, and a receive-2 diode. Pins 7 and 8 of the single-receiver chip are connected to the external power supply, pins 9 and 12 are grounded, and pin 11 is grounded after passing through the receive-1 resistor and the receive-2 resistor. The junction of the receive-1 resistor and the receive-2 resistor is connected to the external power supply after passing through the receive-1 diode and the receive-3 resistor. The junction of the receive-3 resistor and the receive-1 diode is connected to the RXD signal after passing through the receive-2 diode.

[0016] The negative terminal of the receiving diode is connected to pin 4 on the receiving serial port chip, pin 3 on the receiving serial port chip is connected to the RXD signal, pin 1 on the receiving serial port chip is connected to the external power supply, and pin 2 on the receiving serial port chip is grounded.

[0017] The single receiver chip has three capacitors connected in parallel between pins 8 and 9: a receiver capacitor 1, a receiver capacitor 2, and a receiver capacitor 3. A receiver resistor 4 is connected between the receiver capacitor 1 and the receiver capacitor 2.

[0018] The single receiver chip also includes a receiver IC chip, a receiver transistor, and an internal receiver resistor. The positive and negative terminals of the photodiode are connected to the receiver IC chip. The receiver IC chip is also connected to pin 7, the base and collector of the receiver transistor, the emitter of the receiver transistor is connected to pin 11, and the collector of the receiver transistor is connected to pin 8. An internal receiver resistor is connected in parallel between pins 7 and 11.

[0019] The structure and peripheral circuits of the left-middle chip are the same as those of the single-receiver chip, and the structure and peripheral circuits of the right-middle chip are the same as those of the single-transmitter chip. The relay circuit is equal to the sum of the peripheral circuits of the left-middle chip and the peripheral circuits of the right-middle chip.

[0020] The negative terminal of the receiving diode is connected to pin 4 on the serial port chip, the outer end of the transmitting resistor is connected to pin 3 on the serial port chip, pin 1 on the serial port chip is connected to the external power supply, and pin 2 on the serial port chip is grounded.

[0021] The single-transmit chip has a single-transmit slot on its exterior for inserting and fixing one end of the transmitting plastic optical fiber, and the single-receive chip has a single-receive slot on its exterior for inserting and fixing the other end of the receiving plastic optical fiber.

[0022] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0023] 1. This utility model discloses an optical communication module based on plastic optical fiber, mainly comprising a single-transmitter module, a repeater module, a single-receiver module, a transmitting plastic optical fiber, and a receiving plastic optical fiber. The single-transmitter module contains a light-emitting diode (LED) A in its single-transmitter chip. The repeater module contains LED A and LED B respectively in its left and right chips. The single-receiver module contains LED B in its single-receiver chip. In application, the TXD signal controls LED A to emit an optical signal, which is transmitted through the transmitting plastic optical fiber. This is optical signal transmission. After reaching LED A, the optical signal is converted into an electrical signal, which is then transmitted through the repeater circuit to LED B to convert the electrical signal back into an optical signal. This optical signal is then transmitted through the receiving plastic optical fiber, again being optical signal transmission. After reaching LED B, the optical signal is converted back into an electrical signal to control the RXD signal. The advantages of this design include:

[0024] Firstly, the transmission between the fiber optic single-transmitter module, repeater module, and fiber optic single-receiver module in this design is all optical transmission, which is visible light transmission (preferably 450-650nm visible light), rather than traditional quartz fiber, and certainly not electrical signal transmission (such as traditional copper twisted pair). It not only has strong resistance to electromagnetic interference, but also has a high signal fidelity, achieving a communication rate of over 100Mbps and a packet loss rate of 0.01%.

[0025] Secondly, the optical transmission in this design relies on plastic optical fiber. This material not only has a lower attenuation coefficient and higher bandwidth, but also has strong mechanical properties, a high bending radius and toughness, making it suitable for multi-node connections. More importantly, it is very low in cost, making it very suitable for short-distance industrial communication with a large number of nodes, and has a high cost-performance ratio.

[0026] Thirdly, in application, optical path transmission and photoelectric conversion are all performed inside the module, eliminating the need for additional expensive auxiliary equipment such as dedicated light sources, optical power meters, and fiber optic fusion splicers, thus further reducing application costs.

[0027] Therefore, this invention offers high cost-effectiveness for multi-node short-distance industrial communication and is of fundamental importance for industrial data communication and control networks, especially for Industry 4.0 upgrades.

[0028] 2. In this utility model, an optical communication module based on plastic optical fiber includes a single-transmitter module comprising a single-transmitter chip, a transmitter resistor, a transmitter resistor, a transmitter resistor, a transmitter transistor, and a transmitter transistor. Pin 1 of the single-transmitter chip is grounded; pins 2, 3, and 4 are simultaneously connected to the inner terminal of the transmitter resistor; pin 5 is connected to the inner terminal of the transmitter resistor; the outer terminals of both the transmitter resistor and the transmitter resistor are connected to an external power supply; the inner terminal of the transmitter resistor is connected to the collector of the transmitter transistor; and the emitter of the transmitter transistor is grounded. The base of the first transmitter transistor is connected to the outer terminal of the third transmitter resistor and the collector of the second transmitter transistor. The inner terminal of the third transmitter resistor is connected to an external power supply. The emitter of the second transmitter transistor is grounded, and its base is connected to the TXD signal via a fourth transmitter resistor. In application, by adjusting the resistance value of the first transmitter resistor, the overall power consumption of the fiber optic single-transmitter module can be controlled to achieve a balance between the optical signal transmission distance and the overall power consumption of the module. This ensures that the transmission distance meets the requirements while avoiding signal distortion due to excessive power consumption. Therefore, this invention has strong adjustability.

[0029] 3. In this utility model, an optical communication module based on plastic optical fiber includes a transmitter serial port chip on the single-transmitter module, a repeater serial port chip on the repeater module, and a receiver serial port chip on the single-receiver module. The inclusion of these three serial port chips not only improves compatibility but also reduces power consumption and extends communication distance. Furthermore, it protects the internal circuitry of the module. Therefore, this utility model exhibits strong compatibility and low power consumption. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of this utility model.

[0031] Figure 2 yes Figure 1 The circuit diagram.

[0032] Figure 3 yes Figure 2 A schematic diagram of the structure of a single-transmission module for optical fibers.

[0033] Figure 4 yes Figure 2 A schematic diagram of the structure of a single-receiver module for optical fibers.

[0034] Figure 5 yes Figure 2 A schematic diagram of the structure of the relay module.

[0035] In the diagram: Fiber optic single-transmit module 1, repeater module 2, repeater circuit 21, fiber optic single-receive module 3, receive resistor 1 31, receive resistor 2 32, receive resistor 33, receive resistor 4 34, receive diode 1 35, receive diode 2 36, receive capacitor 1 37, receive capacitor 2 38, receive capacitor 39, transmit plastic fiber optic cable 4, receive plastic fiber optic cable 41, single-transmit slot 42, single-receive slot 43, single-transmit chip 5, LED A 50, transmit resistor 1 51, transmit resistor 2 52, transmit resistor 3 53, transmit resistor 4 54, transmit resistor 55, transmit resistor 6 56, transmit resistor 7 57, transmit transistor 1 58, transmit transistor 2 59, single-receive chip 6, photodiode B 60, receive IC chip 61, receive transistor 62, receive internal resistor 63, left-middle chip 7, photodiode A 70, right-middle chip 8, LED B 80, transmit serial port chip 9, receive serial port chip 10, middle serial port chip 11. Detailed Implementation

[0036] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] See Figure 1 — Figure 5 An optical communication module based on plastic optical fiber; the optical communication module includes a single-transmit optical fiber module 1, a repeater module 2, a single-receive optical fiber module 3, a transmitting plastic optical fiber 4, and a receiving plastic optical fiber 41;

[0038] The fiber optic single-transmitter module 1 includes a single-transmitter chip 5, a transmitter resistor 51, a transmitter resistor 52, a transmitter resistor 53, a transmitter transistor 58, and a transmitter transistor 59. The single-transmitter chip 5 internally houses a light-emitting diode 50. The positive and negative terminals of the light-emitting diode 50 are connected to the pins of the single-transmitter chip 5. Pin 1 of the single-transmitter chip 5 is grounded, pins 2, 3, and 4 are simultaneously connected to the inner terminals of the transmitter resistor 52, and pin 5 is connected to the inner terminal of the transmitter resistor 51. The transmitter resistor 51... The outer ends of resistor 52 are connected to an external power supply. The inner end of resistor 52 is connected to the collector of transistor 58. The emitter of transistor 58 is grounded. The base of transistor 58 is connected to the outer end of resistor 53 and the collector of transistor 59. The inner end of resistor 53 is connected to an external power supply. The emitter of transistor 59 is grounded. The base of transistor 59 is connected to the inner end of resistor 54. The outer end of resistor 54 is connected to the TXD signal.

[0039] The relay module 2 includes a relay circuit 21 and a left-center chip 7 and a right-center chip 8 connected to its two ends. The left-center chip 7 has a photodiode A 70 inside, and the right-center chip 8 has a light-emitting diode B 80 inside. The fiber optic single-receiver module 3 includes a single-receiver chip 6, which has a photodiode B 60 inside.

[0040] The first light-emitting diode 50 is optically connected to one end of the emitting plastic optical fiber 4, and the other end of the emitting plastic optical fiber 4 is optically connected to one end of the first photodiode 70. The other end of the first photodiode 70 is connected to one end of the second light-emitting diode 80 after passing through the pins of the left-middle chip 7, the relay circuit 21, and the right-middle chip 8. The other end of the second light-emitting diode 80 is optically connected to one end of the receiving plastic optical fiber 41, and the other end of the receiving plastic optical fiber 41 is optically connected to one end of the second photodiode 60. The other end of the second photodiode 60 is connected to the RXD signal after passing through the pins of the single receiving chip 6.

[0041] The positive terminal of LED 50 is connected to pin 5 of the single-chip 5, and the negative terminal of LED 50 is connected to pins 1 and 4 of the single-chip 5.

[0042] The base of the first-generation transistor 58 is connected to the outer end of the fifth-generation resistor 55 and the third-generation resistor 53, and the collector of the second-generation transistor 59. The base of the second-generation transistor 59 is connected to the inner end of the sixth-generation resistor 56 and the fourth-generation resistor 54. The connection between the base of the second-generation transistor 59 and the sixth-generation resistor 56 is connected to the emitter of the second-generation transistor 59 via the seventh-generation resistor 57.

[0043] The external end of the four-resistor 54 is connected to pin 3 of the serial port chip 9, pin 4 of the serial port chip 9 is connected to the TXD signal, pin 1 of the serial port chip 9 is connected to the external power supply, and pin 2 of the serial port chip 9 is grounded.

[0044] The fiber optic single-receiver module 3 also includes a receiving resistor 31, a receiving resistor 32, a receiving resistor 33, a receiving diode 35, and a receiving diode 36. Pins 7 and 8 of the single-receiver chip 6 are connected to an external power supply, pins 9 and 12 are grounded, and pin 11 is grounded after passing through receiving resistor 31 and receiving resistor 32. The junction of receiving resistor 31 and receiving resistor 32 is connected to the external power supply after passing through receiving diode 35 and receiving resistor 33. The junction of receiving resistor 33 and receiving diode 35 is connected to the RXD signal after passing through receiving diode 36.

[0045] The negative terminal of the receiving diode 36 is connected to pin 4 of the receiving serial port chip 10, pin 3 of the receiving serial port chip 10 is connected to the RXD signal, pin 1 of the receiving serial port chip 10 is connected to the external power supply, and pin 2 of the receiving serial port chip 10 is grounded.

[0046] The single receiver chip 6 has a series of capacitors connected in parallel between pins 8 and 9: a receiver capacitor 37, a receiver capacitor 38, and a receiver capacitor 39. A receiver resistor 34 is connected between the receiver capacitors 37 and 38.

[0047] The single receiver chip 6 also contains a receiver IC chip 61, a receiver transistor 62, and a receiver internal resistor 63. The positive and negative terminals of the photodiode 60 are connected to the receiver IC chip 61. The receiver IC chip 61 is also connected to pin 7, the base and collector of the receiver transistor 62. The emitter of the receiver transistor 62 is connected to pin 11, and the collector of the receiver transistor 62 is connected to pin 8. A receiver internal resistor 63 is connected in parallel between pins 7 and 11.

[0048] The structure and peripheral circuit of the left-middle chip 7 are the same as those of the single receiver chip 6, and the structure and peripheral circuit of the right-middle chip 8 are the same as those of the single transmitter chip 5. The relay circuit 21 is equal to the sum of the peripheral circuits of the left-middle chip 7 and the peripheral circuits of the right-middle chip 8.

[0049] The negative terminal of the receiving diode 36 is connected to pin 4 of the serial port chip 11, the outer end of the transmitting resistor 54 is connected to pin 3 of the serial port chip 11, pin 1 of the serial port chip 11 is connected to the external power supply, and pin 2 of the serial port chip 11 is grounded.

[0050] The single-transmit chip 5 has a single-transmit slot 42 on its exterior for inserting one end of the transmitting plastic optical fiber 4, and the single-receive chip 6 has a single-receive slot 43 on its exterior for inserting the other end of the receiving plastic optical fiber 41.

[0051] The supplementary technical features of this utility model are as follows:

[0052] In the fiber optic single-transmitter module 1 of this design, the functions of the transmitter resistor 51 and the transmitter resistor 52 are voltage divider and current limiter, the transmitter transistor 58 is a first-stage amplifier, and the transmitter transistor 59 is a second-stage amplifier.

[0053] In the fiber optic single-receiver module 3 of this design, the three-receiver resistor 33 is used for current limiting. At the same time, the circuit design between the three-receiver resistor 33, the first-receiver diode 35, and the second-receiver diode 36 can ensure that the TXD voltage signal does not flow back to the three-receiver resistor 33 and the first-receiver diode 35, that is, to ensure that the TXD voltage signal is less than or equal to the voltage between the three-receiver resistor 33 and the first-receiver diode 35. In addition, the first-receiver capacitor 37, the second-receiver capacitor 38, and the third-receiver capacitor 39 are used to ensure that the voltage between Vcc and GND is stable at 5V.

[0054] In this design, optical path connection refers to the illumination of light. For example, light transmitted in a plastic optical fiber can illuminate a photodiode, or light emitted by a light-emitting diode can illuminate a plastic optical fiber.

[0055] Example 1:

[0056] See Figure 1 — Figure 5An optical communication module based on plastic optical fiber is disclosed. The optical communication module includes a single-transmit optical fiber module 1, a repeater module 2, a single-receive optical fiber module 3, a transmitting plastic optical fiber 4, and a receiving plastic optical fiber 41. The single-transmit optical fiber module 1 includes a single-transmit chip 5, a transmitting resistor 51, a transmitting resistor 52, a transmitting resistor 53, a transmitting transistor 58, and a transmitting transistor 59. The single-transmit chip 5 internally houses a light-emitting diode 50, the positive and negative terminals of which are connected to pins of the single-transmit chip 5. Pin 1 of the single-transmit chip 5 is grounded. Pins 2, 3, and 4 are simultaneously connected to the inner terminal of resistor 52 (the second generator). Pin 5 is connected to the inner terminal of resistor 51 (the first generator). The outer terminals of both resistors 51 and 52 are connected to an external power supply. The inner terminal of resistor 52 is connected to the collector of transistor 58 (the first generator). The emitter of transistor 58 is grounded. The base of transistor 58 is simultaneously connected to the outer terminal of resistor 53 (the third generator) and the collector of transistor 59 (the second generator). The inner terminal of resistor 53 is connected to an external power supply. The emitter of transistor 59 is grounded. The base of the four-phase resistor 54 is connected to the inner terminal of the four-phase resistor 54, and the outer terminal of the four-phase resistor 54 is connected to the TXD signal; the repeater module 2 includes a repeater circuit 21 and a left-center chip 7 and a right-center chip 8 connected to its two ends. The left-center chip 7 has a photodiode 70 inside, and the right-center chip 8 has a light-emitting diode 80 inside. The fiber optic single-receiver module 3 includes a single-receiver chip 6, which has a photodiode 60 inside; the photodiode 50 connects to one end of the plastic optical fiber 4. The optical path is connected as follows: the other end of the transmitting plastic optical fiber 4 is optically connected to one end of photodiode 70. The other end of photodiode 70 is connected to one end of LED 80 after passing through the pins of the left-middle chip 7, the relay circuit 21, and the right-middle chip 8. The other end of LED 80 is optically connected to one end of the receiving plastic optical fiber 41. The other end of the receiving plastic optical fiber 41 is optically connected to one end of photodiode 60. The other end of photodiode 60 is connected to the RXD signal after passing through the pins of the single receiving chip 6.

[0057] Example 2:

[0058] The basic content is the same as in Example 1, except that:

[0059] The positive terminal of LED 50 is connected to pin 5 of the single-emitter chip 5, and the negative terminal of LED 50 is connected to pins 1 and 4 of the single-emitter chip 5. The base of transistor 58 is connected to the outer end of resistors 53 and 55, and the collector of transistor 59. The base of transistor 59 is connected to the inner end of resistor 54 and resistor 6. The connection between the base of transistor 59 and resistor 6 is connected to the emitter of transistor 59 via resistor 7.

[0060] In application, the communication distance and transmission power consumption can be controlled by adjusting the resistance value of the transmitter resistor 51 in the circuit. In the experimental scenario, if the transmitter resistor 51 is a 100R resistor, the transmission power consumption is 26.82mA. If the resistor is changed to a 300R resistor, the transmission power consumption is reduced to 9.89mA. However, the former can achieve a transmission distance of up to 150m, while the latter will exhibit signal distortion if it exceeds 100m.

[0061] Example 3:

[0062] The basic content is the same as in Example 1, except that:

[0063] The fiber optic single-receiver module 3 also includes a receiving resistor 31, a receiving resistor 32, a receiving resistor 33, a receiving diode 35, and a receiving diode 36. Pins 7 and 8 of the single-receiver chip 6 are connected to an external power supply, pins 9 and 12 are grounded, and pin 11 is grounded after passing through receiving resistor 31 and receiving resistor 32. The junction of receiving resistor 31 and receiving resistor 32 is connected to the external power supply after passing through receiving diode 35 and receiving resistor 33. The junction of receiving resistor 33 and receiving diode 35 is connected to the RXD signal after passing through receiving diode 36. A receiving capacitor 37, a receiving capacitor 38, and a receiving capacitor 39 are connected in parallel between pins 8 and 9 of the single-receiver chip 6, and a receiving resistor 34 is connected between receiving capacitor 37 and receiving capacitor 38. The structure and peripheral circuits of the left-middle chip 7 are the same as those of the single receiver chip 6, and the structure and peripheral circuits of the right-middle chip 8 are the same as those of the single transmitter chip 5. The relay circuit 21 is equal to the sum of the peripheral circuits of the left-middle chip 7 and the peripheral circuits of the right-middle chip 8.

[0064] The design and plastic optical fiber with attenuation ≤180dB were used for testing. The test results are shown in Tables 1, 2, and 3 below:

[0065] Table 1. Test data when a resistor 51 = 100Ω is applied.

[0066]

[0067] Table 2. Test data when a resistor 51 = 300Ω is applied.

[0068]

[0069] Table 3. Test data for other values ​​when using a resistor with a 51-pin connector.

[0070]

[0071] Test Result Analysis:

[0072] (1) As can be seen from Table 1, the transmission distance and power consumption of optical fiber change with the change of the resistance of the transmitter resistor 51. When the transmitter resistor 51 is 100 ohms, the maximum communication distance can reach 150 meters.

[0073] (2) As shown in Table 2, when the resistor 51 is 300 ohms, the maximum communication distance drops to 100 meters. If this distance is exceeded, data loss or errors will occur.

[0074] (3) As shown in Table 3, as the transmitting resistor 51 increases, the communication distance gradually shortens. In terms of power consumption, the power consumption is basically the same in the static state. Therefore, changing the transmitting resistor 51 will not affect the power consumption in the static state. In terms of the transmitting state, as shown in Tables 1 and 2, when the transmitting resistor 51 is 100 ohms, the transmitting power can reach 26.82mA. When the transmitting resistor 51 is 300 ohms, the transmitting power is 9.89mA. Compared with the transmitting resistor 51 being 100 ohms, the current has decreased, and the transmission distance has also decreased.

[0075] Example 4:

[0076] The basic content is the same as in Example 1, except that:

[0077] The structure and peripheral circuit of the left-middle chip 7 are the same as those of the single-receiver chip 6, and the structure and peripheral circuit of the right-middle chip 8 are the same as those of the single-transmitter chip 5. The relay circuit 21 is equal to the sum of the peripheral circuits of the left-middle chip 7 and the right-middle chip 8. The negative terminal of the receiving diode 36 is connected to pin 4 of the serial port chip 11, the outer end of the transmitting resistor 54 is connected to pin 3 of the serial port chip 11, pin 1 of the serial port chip 11 is connected to the external power supply, and pin 2 of the serial port chip 11 is grounded. The positive terminal of the LED A is connected to pin 5 of the single-transmitter chip, and the negative terminal of the LED A is connected to pins 1 and 4 of the single-transmitter chip.

[0078] The above description is only a preferred embodiment of the present utility model. The protection scope of the present utility model is not limited to the above embodiments. Any equivalent modifications or changes made by those skilled in the art based on the content disclosed in the present utility model should be included in the protection scope recorded in the claims.

Claims

1. An optical communication module based on plastic optical fiber, characterized in that: The optical communication module includes a single-transmit optical fiber module (1), a relay module (2), a single-receive optical fiber module (3), a transmitting plastic optical fiber (4), and a receiving plastic optical fiber (41). The fiber optic single-transmitter module (1) includes a single-transmitter chip (5), a transmitter resistor (51), a transmitter resistor (52), a transmitter resistor (53), a transmitter transistor (58), and a transmitter transistor (59). The single-transmitter chip (5) contains an LED (50). The positive and negative terminals of the LED (50) are connected to the pins of the single-transmitter chip (5). Pin 1 of the single-transmitter chip (5) is grounded. Pins 2, 3, and 4 are simultaneously connected to the inner terminals of the transmitter resistor (52), and pin 5 is connected to the inner terminal of the transmitter resistor (51). The transmitter resistor (59)... 1) The outer ends of the two-phase resistor (52) are connected to the external power supply. The inner end of the two-phase resistor (52) is connected to the collector of the first-phase transistor (58). The emitter of the first-phase transistor (58) is grounded. The base of the first-phase transistor (58) is connected to the outer end of the three-phase resistor (53) and the collector of the second-phase transistor (59). The inner end of the three-phase resistor (53) is connected to the external power supply. The emitter of the second-phase transistor (59) is grounded. The base of the second-phase transistor (59) is connected to the inner end of the four-phase resistor (54). The outer end of the four-phase resistor (54) is connected to the TXD signal. The relay module (2) includes a relay circuit (21) and a left-center chip (7) and a right-center chip (8) connected to its two ends. The left-center chip (7) has a photodiode A (70) inside, and the right-center chip (8) has a light-emitting diode B (80) inside. The fiber optic single-receiver module (3) includes a single-receiver chip (6), which has a photodiode B (60) inside. The first light-emitting diode (50) is optically connected to one end of the emitting plastic optical fiber (4), and the other end of the emitting plastic optical fiber (4) is optically connected to one end of the first photodiode (70). The other end of the first photodiode (70) is connected to one end of the second light-emitting diode (80) after passing through the pin of the left-middle chip (7), the relay circuit (21), and the pin of the right-middle chip (8). The other end of the second light-emitting diode (80) is optically connected to one end of the receiving plastic optical fiber (41), and the other end of the receiving plastic optical fiber (41) is optically connected to one end of the second photodiode (60). The other end of the second photodiode (60) is connected to the RXD signal after passing through the pin of the single receiving chip (6).

2. The optical communication module based on plastic optical fiber according to claim 1, characterized in that: The positive terminal of the LED (50) is connected to pin 5 of the single-chip (5), and the negative terminal of the LED (50) is connected to pins 1 and 4 of the single-chip (5).

3. An optical communication module based on plastic optical fiber according to claim 1 or 2, characterized in that: The base of the first-generation transistor (58) is connected to the outer end of the third-generation resistor (53) and the collector of the second-generation transistor (59) via the fifth-generation resistor (55). The base of the second-generation transistor (59) is connected to the inner end of the fourth-generation resistor (54) via the sixth-generation resistor (56). The connection between the base of the second-generation transistor (59) and the sixth-generation resistor (56) is connected to the emitter of the second-generation transistor (59) via the seventh-generation resistor (57).

4. The optical communication module based on plastic optical fiber according to claim 3, characterized in that: The outer end of the four-phase resistor (54) is connected to pin 3 on the serial port chip (9), pin 4 on the serial port chip (9) is connected to the TXD signal, pin 1 on the serial port chip (9) is connected to the external power supply, and pin 2 on the serial port chip (9) is grounded.

5. An optical communication module based on plastic optical fiber according to claim 1 or 2, characterized in that: The fiber optic single receiver module (3) also includes a receiver resistor (31), a receiver resistor (32), a receiver resistor (33), a receiver diode (35), and a receiver diode (36). Pins 7 and 8 of the single receiver chip (6) are connected to the external power supply, pins 9 and 12 are grounded, and pin 11 is grounded after passing through the receiver resistor (31) and the receiver resistor (32). The junction of the receiver resistor (31) and the receiver resistor (32) is connected to the external power supply after passing through the receiver diode (35) and the receiver resistor (33). The junction of the receiver resistor (33) and the receiver diode (35) is connected to the RXD signal after passing through the receiver diode (36).

6. The optical communication module based on plastic optical fiber according to claim 5, characterized in that: The negative terminal of the receiving diode (36) is connected to pin 4 of the receiving serial port chip (10), pin 3 of the receiving serial port chip (10) is connected to the RXD signal, pin 1 of the receiving serial port chip (10) is connected to the external power supply, and pin 2 of the receiving serial port chip (10) is grounded.

7. The optical communication module based on plastic optical fiber according to claim 5, characterized in that: The single receiver chip (6) has two receiver capacitors (37), two receiver capacitors (38), and three receiver capacitors (39) connected in parallel between pins 8 and 9, and a receiver resistor (34) is connected between the receiver capacitors (37) and two receiver capacitors (38).

8. The optical communication module based on plastic optical fiber according to claim 7, characterized in that: The single receiver chip (6) is also equipped with a receiver IC chip ((61)), a receiver transistor (62), and a receiver internal resistor (63). The positive and negative terminals of the photodiode (60) are connected to the receiver IC chip ((61)). The receiver IC chip ((61)) is connected to pin 7, the base of the receiver transistor (62), and the collector of the receiver transistor (62). The emitter of the receiver transistor (62) is connected to pin 11, and the collector of the receiver transistor (62) is connected to pin 8. A receiver internal resistor (63) is connected in parallel between pins 7 and 11.

9. The optical communication module based on plastic optical fiber according to claim 8, characterized in that: The structure and peripheral circuit of the left-middle chip (7) are the same as those of the single receiver chip (6), and the structure and peripheral circuit of the right-middle chip (8) are the same as those of the single transmitter chip (5). The relay circuit (21) is equal to the sum of the peripheral circuits of the left-middle chip (7) and the peripheral circuits of the right-middle chip (8). The negative terminal of the receiving diode (36) is connected to pin 4 of the serial port chip (11), the outer end of the transmitting resistor (54) is connected to pin 3 of the serial port chip (11), pin 1 of the serial port chip (11) is connected to the external power supply, and pin 2 of the serial port chip (11) is grounded.

10. An optical communication module based on plastic optical fiber according to claim 1 or 2, characterized in that: The single-transmit chip (5) has a single-transmit slot (42) on its exterior for inserting one end of the transmitting plastic optical fiber (4), and the single-receive chip (6) has a single-receive slot (43) on its exterior for inserting the other end of the receiving plastic optical fiber (41).

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