Multi-channel light emission circuit and electro-optical conversion device

Abstract

The utility model relates to the technical field of photoelectric conversion, in particular to a multichannel light emitting circuit and an electro-optical conversion device. According to the multi-channel light emitting circuit, differential signals are directly used as modulation signals to drive the laser, the multi-channel light emitting circuit is suitable for the field of short-distance interconnection, a special driving chip does not need to be arranged to process the differential signals and then regenerate the modulation signals to drive the laser, high-speed interconnection is guaranteed, meanwhile, power consumption of the circuit is greatly reduced, and cost is reduced. And the cost is saved. The filter circuit is arranged for channel isolation, high-frequency signal interference between channels is reduced, the number of the channels is increased, and the data transmission capacity of a link is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of photoelectric conversion, in particular to a multi-channel light emitting circuit and an electro-optical conversion device. Background Art

[0002] A multi-channel electro-optical conversion module is a module that converts electrical signals into optical signals. It has multiple channels and can process multiple electrical signals at the same time and convert them into corresponding optical signals. This module is widely used in fields such as high-speed data transmission, image processing, and radar, and has the advantages of high bandwidth, low loss, low crosstalk, and low noise.

[0003] The multi-channel electro-optical conversion module in the prior art is mainly suitable for transmission over a distance of more than 100M. However, the internal interconnection scenarios in data are currently mainly short-distance interconnections such as internal interconnection within cabinets, backplane-level interconnection, and interconnection between servers and switches. The interconnection distance does not even exceed 5M, which makes the multi-channel optical transmission circuits in the multi-channel electro-optical conversion module have a lot of design redundancy in these short-distance interconnection fields. Therefore, how to reduce the total power consumption of the system in short-distance interconnection and realize high-speed, high-density, and low-power interconnection in data centers is an urgent problem to be solved. Utility Model Content

[0004] The embodiments of the utility model provide a multi-channel optical transmission circuit and an electro-optical conversion device to solve the problem that the multi-channel optical transmission circuit in the prior art cannot realize high-speed, high-density, and low-power consumption interconnection of a data center.

[0005] In a first aspect, the utility model provides a multi-channel optical transmission circuit, comprising: a laser module and N differential signal circuits, wherein the laser module is provided with N lasers, N being a positive integer greater than 1, the input end of each of the differential signal circuits being used to input a differential signal, the output end of each of the differential signal circuits being electrically connected to each of the lasers, and each of the differential signal circuits being used to input the differential signal to each of the lasers, so that each of the lasers converts the differential signal into an optical signal.

[0006] In one embodiment, the multi-channel optical transmission circuit further includes: N first filter circuits, the input end of each first filter circuit is used to input a bias signal, and the output end of each first filter circuit is electrically connected to the positive terminal of each laser.

[0007] In one embodiment, the multi-channel optical transmission circuit further includes: N second filter circuits, the input end of each of the second filter circuits is electrically connected to the negative end of each of the lasers, the output end of each of the second filter circuits is electrically connected to the constant current source chip, and the bias signal is provided by the first power supply.

[0008] In one embodiment, the multi-channel optical transmission circuit further includes: N second filter circuits, the input end of each second filter circuit is electrically connected to the negative end of each laser, the output end of each second filter circuit is grounded, and the bias signal is provided by a constant current source chip.

[0009] In one embodiment, the multi-channel optical transmission circuit also includes N first magnetic bead circuits and N second magnetic bead circuits, the input end of each of the first magnetic bead circuits is respectively connected to the output end of each of the first filter circuits, and the output end of each of the first magnetic bead circuits is respectively connected to the positive end of each of the lasers; the input end of each of the second magnetic bead circuits is respectively connected to the negative end of each of the lasers, and the output end of each of the second magnetic bead circuits is respectively connected to the input end of each of the second filter circuits.

[0010] In one embodiment, each of the differential signal circuits has the same structure, including: a first isolation branch and a second isolation branch, the input end of the first isolation branch is the positive input end of the differential signal circuit, the output end of the first isolation branch is connected to the positive end of the laser, the input end of the second isolation branch is the negative input end of the differential signal circuit, and the output end of the second isolation branch is connected to the negative end of the laser.

[0011] In one embodiment, the structures of each of the first filter circuits are the same, and the first filter circuits include: a first operational amplifier, a first resistor, a second resistor, a first capacitor and a second capacitor, one end of the first resistor is used to input the bias signal, the other end of the first resistor is connected to one end of the second resistor, the other end of the second resistor is connected to one end of the first capacitor, the other end of the first capacitor is grounded, one end of the first capacitor is connected to the non-inverting input of the first operational amplifier, the output of the first operational amplifier is connected to the input of the first magnetic bead circuit, the inverting input of the first operational amplifier is connected to the output of the first operational amplifier, the output of the first operational amplifier is connected to one end of the second capacitor, and the other end of the second capacitor is connected to one end of the second resistor.

[0012] In one embodiment, the structures of each of the first filter circuits are the same, and the first filter circuits include: a first inductor and a third capacitor, one end of the first inductor is used to input the bias signal, the other end of the first inductor is connected to the input end of the first magnetic bead circuit, one end of the third capacitor is connected to one end of the first inductor, and the other end of the third capacitor is grounded.

[0013] In one embodiment, the structures of each of the first filter circuits are the same, and the first filter circuits include: a third resistor and a fourth capacitor, one end of the third resistor is used to input the bias signal, the other end of the third resistor is connected to the input end of the first magnetic bead circuit, one end of the fourth capacitor is connected to one end of the third resistor, and the other end of the fourth capacitor is grounded.

[0014] In a second aspect, this embodiment provides an electro-optical conversion device, which includes the multi-channel light emitting circuit as described in the first aspect and its improvement.

[0015] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0016] The multi-channel optical transmission circuit of the utility model directly uses the differential signal as the modulation signal to drive the laser, which is suitable for the field of short-distance interconnection, and does not need to set up a special driver chip to process the differential signal and then regenerate the modulation signal to drive the laser. While ensuring high-speed interconnection, it greatly reduces the power consumption of the circuit and saves costs. By setting up a filter circuit for channel isolation, the high-frequency signal interference between channels is reduced, the number of channels is expanded, and the data transmission capacity of the link is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments of the utility model will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 It is a schematic diagram of the module structure of a four-channel optical transmission circuit provided by an embodiment of the utility model;

[0019] Figure 2 It is a schematic diagram of the module structure of a four-channel optical transmission circuit provided by an embodiment of the utility model;

[0020] Figure 3 It is a schematic diagram of the module structure of a four-channel optical transmission circuit provided by an embodiment of the utility model;

[0021] Figure 4 It is a schematic diagram of the module structure of a four-channel optical transmission circuit provided by an embodiment of the utility model;

[0022] Figure 5 It is a schematic diagram of the module structure of the first magnetic bead circuit and the second magnetic bead circuit provided in one embodiment of the utility model;

[0023] Figure 6It is a schematic diagram of the module structure of the first differential signal circuit provided by an embodiment of the utility model;

[0024] Figure 7 It is a circuit connection diagram of a first first filter circuit and a first second filter circuit provided by an embodiment of the utility model;

[0025] Figure 8 It is a circuit connection diagram of a first first filter circuit and a first second filter circuit provided by an embodiment of the utility model;

[0026] Fig. 9 It is a circuit connection diagram of a first first filter circuit and a first second filter circuit provided by an embodiment of the utility model;

[0027] Among them, 1. laser module, 2. first differential signal circuit, 3. second differential signal circuit, 4. third differential signal circuit, 5. fourth differential signal circuit, 6. constant current source chip, 11. first laser, 12. second laser, 13. third laser, 14. fourth laser, 21. first first filter circuit, 22. first second filter circuit, 23. first first magnetic bead circuit, 24. first second magnetic bead circuit, 25. first isolation branch, 26. second isolation branch, 31. second first filter circuit, 32. second second filter circuit, 33. second first magnetic bead circuit, 34. second second magnetic bead circuit, 41. third first filter circuit, 42. third second filter circuit, 43. third first magnetic bead circuit, 44. third second magnetic bead circuit, 51. fourth first filter circuit, 52. fourth second filter circuit, 53. fourth first magnetic bead circuit, 54. fourth second magnetic bead circuit. DETAILED DESCRIPTION

[0028] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0029] In the description of the present invention, it should be understood that the terms "longitudinal", "radial", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In order to thoroughly understand the present invention, detailed structures and steps will be presented in the following description to illustrate the technical solution proposed by the present invention. The preferred embodiments of the present invention are described in detail below, but in addition to these detailed descriptions, the present invention may also have other implementations.

[0032] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the disclosure belongs. It will be further understood that the terms used herein should be interpreted as having a meaning consistent with their meaning in the context of this specification and the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined as such herein.

[0033] In one embodiment, if Figure 1 As shown, a schematic diagram of the module structure of a four-channel optical transmission circuit is provided, including: a laser module 1 and N differential signal circuits, wherein N lasers are arranged in the laser module 1, N is a positive integer greater than 1, and the input end of each differential signal circuit is used to input a differential signal, and the output end of each differential signal circuit is electrically connected to each laser, and each differential signal circuit is used to input the differential signal to each laser, so that each laser converts the differential signal into an optical signal.

[0034] Specifically, the laser module 1 is a laser chip, which is formed by a plurality of lasers. Each differential signal circuit is connected to the positive terminal and the negative terminal of each laser respectively. Each laser is used to directly convert the differential signal at its input end into an optical signal synchronized with the differential signal. The differential signal can be a differential signal sent by a switch or a differential signal sent by a transmitter. Capacitors or resistors and other components can be set in the differential signal circuit to synchronize the laser module 1.

[0035] It is understandable that N can be any positive integer greater than 1. Figure 1 In the multi-channel optical transmitting circuit shown, N is 4, that is, it is a four-channel optical transmitting circuit. As other implementations, N can be 8, and the multi-channel optical transmitting circuit is an eight-channel optical transmitting circuit. N can also be 12, and the multi-channel optical transmitting circuit is a twelve-channel optical transmitting circuit. The structures of the differential signal circuits of each channel can be the same, or the structures of the differential signal circuits of each channel can be different.

[0036] The working process of the above-mentioned multi-channel optical transmission circuit is: the switch or transmitter transmits the differential signal to the laser through the differential signal circuit. The resistance value of the laser is fixed, and the differential signal is a voltage signal. Under the premise of fixed resistance value, the corresponding modulation current is generated, and the modulation current generated by the differential signal is used to directly modulate the laser, so that the laser generates an optical signal synchronized with the differential signal.

[0037] The multi-channel optical transmission circuit of this embodiment directly uses the differential signal as the modulation signal to drive the laser, which is suitable for the field of short-distance interconnection. There is no need to set up a special driver chip to process the differential signal and then regenerate the modulation signal to drive the laser. While ensuring high-speed interconnection, it greatly reduces the power consumption of the circuit and saves costs.

[0038] In one embodiment, if Figure 2 As shown, a schematic diagram of the module structure of a four-channel optical transmission circuit is provided. Figure 1 Based on the four-channel optical transmitting circuit shown, the multi-channel optical transmitting circuit also includes: N first filter circuits, the input end of each first filter circuit is used to input a bias signal, and the output end of each first filter circuit is electrically connected to the positive end of each laser.

[0039] Specifically, the structures of the various first filter circuits can be the same, and the structures of the various first filter circuits can also be the same. Preferably, a constant current source chip is used to provide a bias current for the laser. The bias current can be provided to the laser by a current pull method, that is, the input end of the first filter circuit is connected to the first power supply, and the negative end of the laser is connected to the constant current source chip; the bias current can also be provided to the laser by a current injection method, that is, the input end of the first filter circuit is connected to the constant current source chip, and the negative end of the laser is grounded.

[0040] The model of the constant current source chip can be selected according to the actual application. If it is a four-channel optical transmission circuit, preferably, if it is a current injection method, TPS75100 can be selected as the constant current source chip, if it is a current pulling method, LP5810 can be selected as the constant current source chip, and if it is a sixteen-channel current pulling method optical transmission circuit, LP3943 can be selected as the constant current source chip. The current provided by the constant current source chip for each single channel should be within the conduction current range of each laser. Preferably, the current range provided by the constant current source chip for each single channel is 0mA-20mA.

[0041] It is understandable that the first filter circuit may be any filter circuit, the first filter circuit may be an RC filter circuit, the first filter circuit may be an LC filter circuit, or the first filter circuit may be an RL filter circuit.

[0042] The working process of the above multi-channel light emitting circuit is as follows: the bias signal provides a constant current to each laser through each first filter circuit, so that each laser works in a linear light emitting region.

[0043] The multi-channel light emitting circuit of this embodiment is provided with each first filtering circuit to provide a constant current for each laser, so that each laser operates in a linear light emitting area, thereby ensuring that each laser operates stably and stably, ensuring the stability of the circuit, and the first filtering circuit can reduce the signal interference of each channel, and prevent the differential signal from being transmitted through the constant current source chip and affecting other channels.

[0044] In one embodiment, if Figure 3 As shown, a schematic diagram of the module structure of a four-channel optical transmission circuit is provided. Figure 2 Based on the four-channel light emitting circuit shown, the multi-channel light emitting circuit also includes: N second filter circuits, the input end of each second filter circuit is electrically connected to the negative end of each laser, the output end of each second filter circuit is electrically connected to the constant current source chip 6, and the bias signal is provided by the first power supply.

[0045] Specifically, the structures of the second filter circuits may be the same or different. This embodiment uses a current-pulling method to provide bias current for each laser. Preferably, the first power supply is a 3.3V constant voltage source.

[0046] It is understandable that the structure of the second filter circuit can be the same as that of the first filter circuit, or the structure of the second filter circuit can be different from that of the first filter circuit. The second filter circuit can be any type of filter circuit. The second filter circuit can be an RC filter circuit, an LC filter circuit, or an RL filter circuit.

[0047] The working process of the above multi-channel optical transmission circuit is as follows: the signal of the first power supply flows to each laser through each first filter circuit, and flows to the constant current source chip 6 from each second filter circuit after passing through each laser.

[0048] The multi-channel optical transmission circuit of this embodiment uses a current-pulling method to provide bias current for each laser, so that the load presents a lower impedance, thereby greatly improving the transmission rate.

[0049] In one embodiment, if Figure 4 As shown, a schematic diagram of the module structure of a multi-channel optical transmission circuit is provided. Figure 2 Based on the multi-channel light emitting circuit shown, the multi-channel light emitting circuit also includes: N second filter circuits, the input end of each second filter circuit is electrically connected to the negative end of each laser, the output end of each second filter circuit is grounded, and the bias signal is provided by the constant current source chip 6.

[0050] The second filter circuit in this embodiment is Figure 3 The second filter circuit of the embodiment shown is the same filter circuit, except that the second filter circuit in this embodiment is different from Figure 3 The connection relationship of the second filter circuit in the embodiment shown is different. This embodiment adopts a current injection method to provide bias current for each laser.

[0051] The working process of the above multi-channel optical transmission circuit is as follows: the current output by the constant current source chip 6 flows to each laser through the first filter circuit, and flows to the ground from each second filter circuit after passing through each laser.

[0052] The multi-channel optical transmission circuit of this embodiment adopts the current injection method to provide bias current for each laser, thereby ensuring that the circuit can provide sufficient current for the laser and improving the signal quality of the circuit.

[0053] In one embodiment, if Figure 5 As shown, a schematic diagram of the module structure of four first magnetic bead circuits and four second magnetic bead circuits is provided. Figure 3 The multi-channel optical transmission circuit shown or the above Figure 4 On the basis of the multi-channel optical transmitting circuit shown, the multi-channel optical transmitting circuit also includes N first magnetic bead circuits and N second magnetic bead circuits, the input end of each first magnetic bead circuit is respectively connected to the output end of each first filter circuit, and the output end of each first magnetic bead circuit is respectively connected to the positive end of each laser; the input end of each second magnetic bead circuit is respectively connected to the negative end of each laser, and the output end of each second magnetic bead circuit is respectively connected to the input end of each second filter circuit.

[0054] The structure of the first magnetic bead circuit can be the same as that of the second magnetic bead circuit, or the structure of the first magnetic bead circuit can be different from that of the second magnetic bead circuit. Only one magnetic bead can be set in the first magnetic bead circuit and the second magnetic bead circuit, or any integer number of magnetic beads greater than one can be set in series.

[0055] The working process of the above-mentioned multi-channel optical transmission circuit is as follows: the signal output by the first power supply flows to each laser after passing through the first filter circuit and the first magnetic bead circuit, and the signal output by the laser flows to the constant current source chip 6 after passing through the second filter circuit and the second magnetic bead circuit; or, the current output by the constant current source chip 6 flows to each laser after passing through the first filter circuit and the first magnetic bead circuit, and the signal output by the laser flows to the ground after passing through the second filter circuit and the second magnetic bead circuit.

[0056] In the multi-channel optical transmission circuit of this embodiment, a first magnetic bead circuit is arranged between the first filter circuit and the laser, and a second magnetic bead circuit is arranged between the second filter circuit and the laser. The magnetic beads have excellent high-frequency characteristics and can convert high-frequency signals into heat energy, which greatly reduces the interference between channels and further improves the transmission rate.

[0057] In one embodiment, if Figure 6 As shown, a first schematic diagram of the module structure of a differential signal circuit is provided. Figure 1 On the basis of the multi-channel optical transmitting circuit shown, each differential signal circuit has the same structure, including: a first isolation branch 25 and a second isolation branch 26, the input end of the first isolation branch 25 is the positive input end of the differential signal circuit, the output end of the first isolation branch 25 is connected to the positive end of the laser, the input end of the second isolation branch 26 is the negative input end of the differential signal circuit, and the output end of the second isolation branch 26 is connected to the negative end of the laser.

[0058] Preferably, the first isolation branch 25 and the second isolation branch 26 have the same structure, and capacitors are provided in the first isolation branch 25 and the second isolation branch 26. The differential signal is processed by the capacitor and then transmitted to the laser.

[0059] The working process of the above multi-channel optical transmission circuit is as follows: the differential signal is processed by the first isolation branch 25 and the second isolation branch 26 and then flows to the laser to control the laser.

[0060] The multi-channel optical transmission circuit of this embodiment is provided with a first isolation branch 25 and a second isolation branch 26 to process the differential signal before it flows to the laser, so as to protect the laser and ensure the stability of the circuit.

[0061] In one embodiment, if Figure 7As shown, a circuit connection diagram of a first first filter circuit and a first second filter circuit is provided. Figure 5 On the basis of the multi-channel optical transmission circuit shown, the structures of each of the first filtering circuits are the same. The first filtering circuit includes: a first operational amplifier U1, a first resistor R1, a second resistor R2, a first capacitor C1 and a second capacitor C2, one end of the first resistor R1 is used to input the bias signal, the other end of the first resistor R1 is connected to one end of the second resistor R2, the other end of the second resistor R2 is connected to one end of the first capacitor C1, the other end of the first capacitor C1 is grounded, one end of the first capacitor C1 is connected to the in-phase input end of the first operational amplifier U1, the output end of the first operational amplifier U1 is connected to the input end of the first magnetic bead circuit, the inverting input end of the first operational amplifier U1 is connected to the output end of the first operational amplifier U1, the output end of the first operational amplifier U1 is connected to one end of the second capacitor C2, and the other end of the second capacitor C2 is connected to one end of the second resistor R2.

[0062] In this embodiment, a first operational amplifier U1, a first resistor R1, a second resistor R2, a first capacitor C1 and a second capacitor C2 are used to form a low-pass filter in the first filtering circuit, and the low-pass filter is used to isolate the channels. Preferably, a low-pass filter is also provided in the second filtering circuit, and the low-pass filter in the first filtering circuit and the low-pass filter in the second filtering circuit are used to prevent signal interference between channels.

[0063] The working process of the above-mentioned multi-channel optical transmission circuit is as follows: the signal output by the first power supply flows to the second resistor R2 through the first resistor R1, and then flows to the non-inverting input terminal of the first operational amplifier U1 after being filtered by the capacitor C1. The signal at the output terminal of the first operational amplifier U1 forms positive feedback through the second capacitor C1, and forms negative feedback through connection with the inverting input terminal of the first operational amplifier U1. The signal at the output terminal flows to the first first magnetic bead circuit 23 after positive feedback and negative feedback processing, and flows to the first laser 11 through the first first magnetic bead circuit 23.

[0064] The multi-channel optical transmission circuit of this embodiment is provided with active low-pass filters in the input and output channels of the bias signal to isolate the channels from each other. It does not need to provide a dedicated driver chip and can also prevent signal interference between channels.

[0065] In one embodiment, if Figure 8 As shown, a circuit connection diagram of a first first filter circuit and a first second filter circuit is provided. Figure 5On the basis of the multi-channel optical transmitting circuit shown, the structures of each of the first filtering circuits are the same, and the first filtering circuit includes: a first inductor L1 and a third capacitor C5, one end of the first inductor L1 is used to input the bias signal, the other end of the first inductor L1 is connected to the input end of the first magnetic bead circuit, one end of the third capacitor C5 is connected to one end of the first inductor, and the other end of the third capacitor C5 is grounded.

[0066] In this embodiment, the first inductor L1 and the third capacitor C5 are used to form an LC filter circuit in the first filter circuit, and the LC filter circuit is used to achieve isolation between channels. Preferably, an LC filter circuit is also provided in the second filter circuit, and the LC filter circuit in the first filter circuit and the LC filter circuit in the second filter circuit are used to prevent signal interference between channels.

[0067] The working process of the above-mentioned multi-channel optical transmitting circuit is as follows: the signal output by the first power supply is filtered by the LC filter circuit composed of the first inductor L1 and the third capacitor C5, and then flows to the first first magnetic bead circuit 23, and then flows to the first laser 11 through the first first magnetic bead circuit 23.

[0068] The multi-channel optical transmission circuit of this embodiment is provided with LC filter circuits in the input and output channels of the bias signal. The LC filter circuit, especially the third capacitor C5 connected to the ground, can effectively isolate high-frequency signal interference between channels.

[0069] In one embodiment, if Fig. 9 As shown, a circuit connection diagram of a first first filter circuit 21 and a first second filter circuit 22 is provided. Figure 5 On the basis of the multi-channel optical transmission circuit shown, the structures of the various first filter circuits are the same, and the first filter circuit includes: a third resistor R5 and a fourth capacitor C7, one end of the third resistor R5 is used to input the bias signal, the other end of the third resistor R5 is connected to the input end of the first magnetic bead circuit, one end of the fourth capacitor C7 is connected to one end of the third resistor R5, and the other end of the fourth capacitor C7 is grounded.

[0070] In this embodiment, a third resistor R5 and a fourth capacitor C7 are used in the first filter circuit to form an RC filter circuit, and the RC filter circuit is used to achieve isolation between channels. Preferably, an RC filter circuit is also provided in the second filter circuit, and the RC filter circuit in the first filter circuit and the RC filter circuit in the second filter circuit are used to prevent signal interference between channels.

[0071] The working process of the above-mentioned multi-channel optical transmission circuit is as follows: the signal output by the first power supply is filtered by the RC filter circuit composed of the third resistor R5 and the fourth capacitor C7, and then flows to the first first magnetic bead circuit 23, and then flows to the first laser through the first first magnetic bead circuit 23.

[0072] The multi-channel optical transmission circuit of this embodiment is provided with RC filter circuits in the input and output channels of the bias signal. The RC filter circuit, especially the fourth capacitor C7 connected to the ground, can effectively isolate high-frequency signal interference between channels.

[0073] In one embodiment, an electro-optical conversion device is provided, wherein the electro-optical conversion device is the multi-channel light emitting circuit mentioned in any of the above embodiments.

[0074] A switch or a transmitter is provided in the electro-optical conversion device, and the switch or the transmitter is electrically connected to the input end of the differential signal circuit. The differential signal can be a differential signal sent by the switch, or a differential signal sent by the transmitter.

[0075] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some of the technical features therein by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A multi-channel optical transmission circuit, characterized in that: include: A laser module and N differential signal circuits, wherein N lasers are arranged in the laser module, N is a positive integer greater than 1, the input end of each differential signal circuit is used to input a differential signal, the output end of each differential signal circuit is electrically connected to each laser, and each differential signal circuit is used to input the differential signal to each laser, so that each laser converts the differential signal into an optical signal.

2. The multi-channel optical transmission circuit according to claim 1, characterized in that: The multi-channel optical transmission circuit further includes: N first filter circuits, the input end of each of the first filter circuits is used to input a bias signal, and the output end of each of the first filter circuits is electrically connected to the positive terminal of each of the lasers.

3. The multi-channel optical transmission circuit according to claim 2, characterized in that: The multi-channel optical transmission circuit also includes: N second filter circuits, the input end of each second filter circuit is electrically connected to the negative end of each laser, the output end of each second filter circuit is electrically connected to the constant current source chip, and the bias signal is provided by the first power supply.

4. The multi-channel optical transmission circuit according to claim 2, characterized in that: The multi-channel optical transmission circuit also includes: N second filter circuits, the input end of each second filter circuit is electrically connected to the negative end of each laser, the output end of each second filter circuit is grounded, and the bias signal is provided by a constant current source chip.

5. The multi-channel optical transmission circuit according to any one of claims 3 or 4, characterized in that: The multi-channel optical transmission circuit also includes N first magnetic bead circuits and N second magnetic bead circuits, the input end of each of the first magnetic bead circuits is respectively connected to the output end of each of the first filter circuits, and the output end of each of the first magnetic bead circuits is respectively connected to the positive end of each of the lasers; the input end of each of the second magnetic bead circuits is respectively connected to the negative end of each of the lasers, and the output end of each of the second magnetic bead circuits is respectively connected to the input end of each of the second filter circuits.

6. The multi-channel optical transmission circuit according to claim 1, characterized in that: The structures of the differential signal circuits are the same, including: a first isolation branch and a second isolation branch, the input end of the first isolation branch is the positive input end of the differential signal circuit, the output end of the first isolation branch is connected to the positive end of the laser, the input end of the second isolation branch is the negative input end of the differential signal circuit, and the output end of the second isolation branch is connected to the negative end of the laser.

7. The multi-channel light transmitting circuit according to claim 5, characterized in that: The structures of the first filtering circuits are the same. The first filtering circuits include: a first operational amplifier, a first resistor, a second resistor, a first capacitor and a second capacitor. One end of the first resistor is used to input the bias signal. The other end of the first resistor is connected to one end of the second resistor. The other end of the second resistor is connected to one end of the first capacitor. The other end of the first capacitor is grounded. One end of the first capacitor is connected to the non-inverting input of the first operational amplifier. The output of the first operational amplifier is connected to the input of the first magnetic bead circuit. The inverting input of the first operational amplifier is connected to the output of the first operational amplifier. The output of the first operational amplifier is connected to one end of the second capacitor. The other end of the second capacitor is connected to one end of the second resistor.

8. The multi-channel light transmitting circuit as claimed in claim 5, characterized in that: The structures of the first filter circuits are the same. The first filter circuits include: a first inductor and a third capacitor. One end of the first inductor is used to input the bias signal, and the other end of the first inductor is connected to the input end of the first magnetic bead circuit. One end of the third capacitor is connected to one end of the first inductor, and the other end of the third capacitor is grounded.

9. The multi-channel light transmitting circuit as claimed in claim 5, characterized in that: The structures of the first filter circuits are the same. The first filter circuits include: a third resistor and a fourth capacitor. One end of the third resistor is used to input the bias signal, and the other end of the third resistor is connected to the input end of the first magnetic bead circuit. One end of the fourth capacitor is connected to one end of the third resistor, and the other end of the fourth capacitor is grounded.

10. An electro-optical conversion device, characterized in that: The electro-optical conversion device is provided with a multi-channel light emitting circuit as described in any one of claims 1-9.

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