Multi-mode terminal and optical communication system

Abstract

The present application relates to the technical field of optical communications, and provides a multi-mode terminal and an optical communication system. The multi-mode terminal comprises an optical physics chip, an emitting assembly, and an MAC chip. The optical physics chip comprises a first switch and a driving module. The emitting assembly comprises a plurality of lasers. A wire inlet end of the first switch is electrically connected to the driving module, and a plurality of wire outlet ends of the first switch are respectively electrically connected to the plurality of lasers. The optical physics chip is electrically connected to the MAC chip. The first switch receives a first mode selection signal, and controls the wire inlet end to be connected to the wire outlet end connected to the laser indicated by the first mode selection signal. In the present application, multi-generation networks in the multi-mode terminal reuse one assembly, thereby improving the integration level.

Description

Multi-mode terminal and optical communication system

[0001] The present application claims priority to the Chinese patent application No. 202410718046.0, filed on June 04, 2024, and entitled "Multi-mode terminal and optical communication system", the entire content of which is incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the field of optical communication technology, in particular to a multi-mode terminal and an optical communication system. BACKGROUND

[0003] In a passive optical network (PON) system, an optical line terminal (OLT) establishes a communication connection with each optical network unit (ONU) in the system. Currently, when deploying a PON system on a large scale, there is a situation of coexistence of multiple generations of networks. The OLT is replaced with a multi-mode OLT that integrates multiple generations of network functions in one optical module and can support multiple generations of network communication. Moreover, as the network bandwidth upgrades, the ONUs also need to be upgraded. However, some users are unwilling to replace the ONUs, so there is a demand to integrate multiple generations of network functions in one ONU, i.e., the demand for a multi-mode ONU.

[0004] Currently, when integrating multiple generations of network functions in one multi-mode ONU, the ONU includes a media access control (MAC) chip, an electronic switch, and an optical physical chip and a transceiver assembly of each generation of network. The MAC chip selects to connect with a set of transceiver assemblies through the electronic switch. In this way, multiple sets of transceiver assemblies need to exist in the ONU, and the integration degree is relatively low. SUMMARY

[0005] The present application provides a multi-mode terminal and an optical communication system, which can improve the integration degree of the multi-mode terminal. The technical solution is as follows:

[0006] In a first aspect, the present application provides a multi-mode terminal, which includes an optical physical chip, a transmitting assembly, and a MAC chip. The optical physical chip includes a first switch and a driving module, the transmitting assembly includes N lasers, the wire-in end of the first switch is electrically connected with the driving module, N wire-out ends of the first switch are respectively electrically connected with one laser of the N lasers, the optical physical chip is electrically connected with the MAC chip, and N is greater than 1. The first switch is used to receive a first mode selection signal and control the wire-in end to connect with the wire-out end of the laser indicated by the first mode selection signal.

[0007] In the scheme shown in the present application, the optical physical chips of multiple generations of networks are integrated together in a multi-mode terminal, and the transmitting components of each generation of network are connected with the optical physical chip, so that the transmitting components of multiple generations of networks share a set of drivers, and the integration degree can be improved.

[0008] In an optional manner, the transmission rates of the optical signals output by the N lasers are different.

[0009] In an optional manner, the first switch includes N first sub-switches; the first terminal of the driving module is electrically connected with the line-in terminals of the N first sub-switches, and the line-out terminals of the N first sub-switches are respectively electrically connected with the first connection terminals of one laser in the N lasers; the second connection terminals of the N lasers are electrically connected with the reference level, the first connection terminal is an anode, and the second connection terminal is a cathode, or the first connection terminal is a cathode, and the second connection terminal is an anode; the N first sub-switches are used to receive the first mode selection signal, control the line-in terminal and the line-out terminal of the first sub-switch of the laser connected by the first mode selection signal to be connected, and control the line-in terminal and the line-out terminal of other first sub-switches to be disconnected.

[0010] In the scheme shown in the present application, in the optical physical chip, a switch is arranged between the terminal of the driving module and the laser, and the switching of the working mode of the multi-mode terminal is realized by controlling the on-off of the switch. In this way, the optical physical chip can realize the single-anode or single-cathode selection scheme.

[0011] In an optional manner, the second terminal of the driving module is electrically connected with the second connection terminals of the N lasers; and the second connection terminals of the N lasers are electrically connected with the reference level through an isolation element that passes direct current and blocks alternating current.

[0012] In an optional manner, the first switch includes N first sub-switches, the N terminals of the driving module are respectively electrically connected with the line-in terminals of one first sub-switch in the N first sub-switches and the first connection terminals of one laser in the N lasers; the line-out terminals of the N first sub-switches are electrically connected with the second connection terminals of the N lasers through capacitors, the second connection terminals of the N lasers are electrically connected with the reference level, the first connection terminal is an anode, and the second connection terminal is a cathode, or the first connection terminal is a cathode, and the second connection terminal is an anode; and the N first sub-switches are used to receive the first mode selection signal, control the line-in terminal and the line-out terminal of the first sub-switch of the laser in parallel indicated by the first mode selection signal to be disconnected, and control the line-in terminal and the line-out terminal of other first sub-switches to be connected.

[0013] In the scheme shown in the application, one terminal of the driving module is connected with the first connection terminal of the laser, and the other terminal is connected with the second connection terminal of the laser through a switch. By controlling the on-off of the switch, the non-working laser is bypassed, and the switching of the working mode of the multi-mode terminal is realized. In this way, the optical physics chip can realize the single cathode or single anode selection scheme.

[0014] In an optional manner, the first switch includes N second sub-switches and N third sub-switches; the first terminal of the driving module is electrically connected with the line-in terminals of the N second sub-switches, and the line-out terminals of the N second sub-switches are respectively electrically connected with the anodes of the lasers in the N lasers; the second terminal of the driving module is electrically connected with the line-in terminals of the N third sub-switches, and the N third sub-switches are respectively electrically connected with the cathodes of the lasers in the N lasers, the cathodes of the N lasers are respectively electrically connected with reference levels, and the reference levels connected with the N lasers are not the same; the N second sub-switches are used for receiving the first mode selection signal, controlling the line-in terminal and the line-out terminal of the second sub-switch connected with the laser indicated by the first mode selection signal in the N second sub-switches to be connected, and controlling the line-in terminal and the line-out terminal of other second sub-switches to be disconnected; and the N third sub-switches are used for receiving the first mode selection signal, controlling the line-in terminal and the line-out terminal of the third sub-switch connected with the laser indicated by the first mode selection signal in the N third sub-switches to be connected, and controlling the line-in terminal and the line-out terminal of other third sub-switches to be disconnected.

[0015] In the scheme shown in the application, when one laser works, the cathode and the anode are normally connected with the terminals of the driving module, and the bipolar selection scheme of the optical physics chip can be realized.

[0016] In an optional manner, the first switch is used for receiving the first mode selection signal from the MAC chip; or the first switch is used for receiving the first mode selection signal input into the multi-mode terminal. In this way, there are various ways to control the switching of the working mode of the multi-mode terminal.

[0017] In an optional manner, the multi-mode terminal further includes a receiving assembly, the receiving assembly includes a multi-mode transimpedance amplifier and N detectors, the multi-mode transimpedance amplifier includes a second switch and a transimpedance amplification unit, and the optical physics chip further includes a limiting amplifier; N line-in terminals of the second switch are respectively electrically connected with one detector in the N detectors, and a line-out terminal is electrically connected with the transimpedance amplification unit; the transimpedance amplification unit is electrically connected with the limiting amplifier; and the second switch is used for receiving a second mode selection signal and controlling the line-in terminal of the detector connected with the second switch to be connected with the line-out terminal of the second switch, which is indicated by the second mode selection signal.

[0018] In the scheme shown in the present application, in the multi-mode terminal, not only the optical physical chips of multiple generations of networks are integrated together, but also the receiving components of multiple generations of networks are connected with the optical physical chip, so that the receiving components of multiple generations of networks share a set of drivers, and the trans-impedance amplification parts are integrated together, so that the receiving components of multiple generations of networks share the trans-impedance amplification part, and the integration degree can be improved from the aspects of transmission and reception.

[0019] In an optional mode, the multi-mode trans-impedance amplifier further includes a mirror voltage detection circuit, the receiving component further includes a sampling resistor, a third switch and N reference levels; the mirror voltage detection circuit is electrically connected with the sampling resistor, the third switch has an input terminal electrically connected with the sampling resistor, N output terminals are respectively electrically connected with one of the N reference levels, the voltages of the N reference levels correspond to the N detectors one by one, and the voltages of the N reference levels are different; the third switch is used for receiving a level selection signal, and connecting the output terminal of the reference level indicated by the level selection signal with the input terminal of the third switch; and the mirror voltage detection circuit is used for detecting the voltage of the sampling resistor, and the voltage is used for indicating the generation of the second mode selection signal.

[0020] In the scheme shown in the present application, the mirror voltage detection circuit exists in the multi-mode trans-impedance amplifier, so that the terminal for detecting the RSSI is multiplexed with the input terminal of the second mode selection signal, without adding an additional working mode switching pin, and the structure of the multi-mode trans-impedance amplifier is simplified.

[0021] In an optional mode, the multi-mode trans-impedance amplifier further includes a fourth switch; the input terminal of the fourth switch is electrically connected with the mirror voltage detection circuit, and N output terminals are respectively electrically connected with one of the N detectors; the fourth switch is used for receiving the second mode selection signal, and controlling the output terminal of the detector connected with the second mode selection signal to be connected with the input terminal of the fourth switch.

[0022] In the scheme shown in the present application, the multi-mode trans-impedance amplifier can supply power for the detectors, without additionally adding a power supply.

[0023] In an optional mode, the receiving component further includes N-1 first power supplies, and the N detectors include one first detector and N-1 second detectors; the mirror voltage detection circuit is electrically connected with the first detector, and the N-1 first power supplies are electrically connected with the N-1 second detectors one by one; or, the receiving component further includes N first power supplies, and the N detectors are respectively electrically connected with one of the N first power supplies.

[0024] In the scheme shown in the application, when there are some high-voltage driven detectors in the N detectors, the other power supply besides the trans-impedance amplifier can be used for power supply. Alternatively, the N detectors can all use the other power supply besides the trans-impedance amplifier for power supply.

[0025] In an alternative way, the multi-mode trans-impedance amplifier further comprises a second power supply and a voltage detection unit; the second power supply is electrically connected with the N detectors and the voltage detection unit, the N detectors are connected in parallel and with the voltage detection unit in parallel, and the working voltages of the N detectors are different; the second power supply is configured to receive a voltage value signal and output the voltage indicated by the voltage value signal; the voltage detection unit is configured to detect the voltage output by the second power supply, and the voltage detected by the voltage detection unit is used to indicate the generation of the second mode selection signal; alternatively, the multi-mode trans-impedance amplifier further comprises a second power supply, a voltage detection unit and a voltage reduction unit; the second power supply is electrically connected with the N detectors and the voltage reduction unit, the N detectors are connected in parallel and with the voltage reduction unit in parallel, and the voltage reduction unit is electrically connected with the voltage detection unit, and the working voltages of the N detectors are different; the second power supply is configured to receive a voltage value signal and output the voltage indicated by the voltage value signal; the voltage detection unit is configured to detect the voltage after the voltage output by the second power supply is reduced by the voltage reduction unit.

[0026] In the scheme shown in the application, the working voltages of the plurality of detectors are different, the input terminal of the second mode selection signal multiplexes the power supply terminals of the plurality of detectors, and no additional working mode switching pin is needed, thereby simplifying the structure of the multi-mode trans-impedance amplifier.

[0027] In an alternative way, the transmitting assembly further comprises a first base, and the first base comprises N first pins and a second pin; the first connection terminals of the N lasers are respectively electrically connected with the first terminals of the driving module through one of the N first pins; and the second connection terminals of the N lasers are electrically connected with the second terminal of the driving module through the second pin.

[0028] In the scheme shown in the application, the N lasers share a cathode or a anode, so that the transmitting assembly only needs one wire when packaged, which not only reduces the signal quality loss caused by multiple wires, but also improves the integration.

[0029] In an alternative mode, the receiving assembly further comprises a second base, the second base comprising a first power supply pin, a signal pin and a first multiplexing pin; the multi-mode trans-impedance amplifier further comprises a power supply pin, N power supply pins, a signal output pin and a received signal strength indication (RSSI) pin; the first power supply pin is electrically connected to the power supply pin, the signal pin is electrically connected to the signal output pin, and the first multiplexing pin is electrically connected to the RSSI pin; the N power supply pins are respectively electrically connected to one of the N detectors; the first multiplexing pin is configured to receive the level selection signal.

[0030] In the scheme shown in the present application, when the receiving assembly is packaged, the RSSI pin is multiplexed with the input terminal of the second mode selection signal, which can simplify the structure and improve the integration.

[0031] In an alternative mode, the receiving assembly further comprises a second base, the second base comprising a first power supply pin, N-1 second power supply pins, a signal pin and a first multiplexing pin, and the multi-mode trans-impedance amplifier further comprises a power supply pin, a power supply pin, a signal output pin and a RSSI pin; the first power supply pin is electrically connected to the power supply pin, the power supply pin is electrically connected to the first detector, the N-1 second power supply pins are respectively electrically connected to one of the N-1 second detectors, the signal pin is electrically connected to the signal output pin, and the first multiplexing pin is electrically connected to the RSSI pin; the first multiplexing pin is configured to receive the level selection signal.

[0032] In the scheme shown in the present application, when the receiving assembly is packaged, the RSSI pin is multiplexed with the input terminal of the second mode selection signal, which can simplify the structure and improve the integration.

[0033] In an alternative mode, the receiving assembly further comprises a second base, the second base comprising a first power supply pin, N-1 second power supply pins, a signal pin and a first multiplexing pin, and the multi-mode trans-impedance amplifier further comprises a power supply pin, a power supply pin, a signal output pin and a RSSI pin; the first power supply pin is electrically connected to the power supply pin, the power supply pin is electrically connected to the first detector, the N-1 second power supply pins are respectively electrically connected to one of the N-1 second detectors, the signal pin is electrically connected to the signal output pin, and the first multiplexing pin is electrically connected to the RSSI pin; the first multiplexing pin is configured to receive the level selection signal.

[0034] In the scheme shown in the present application, when the receiving assembly is packaged, the RSSI pin is multiplexed with the input terminal of the second mode selection signal, which can simplify the structure and improve the integration.

[0035] In an alternative mode, the receiving assembly further comprises a second base, the second base comprising a first power supply pin, a signal pin and a second multiplexing pin, the multi-mode trans-impedance amplifier further comprising a power supply pin and a signal output pin; the first power supply pin is electrically connected with the power supply pin, the signal pin is electrically connected with the signal output pin, and the second multiplexing pin is electrically connected with each of the N detectors; the second multiplexing pin is configured to receive the voltage value signal and supply power for each of the detectors.

[0036] In the scheme shown in the present application, the power supply pin of the detector is multiplexed with the input terminal of the second mode selection signal when the receiving assembly is packaged, which can simplify the structure and improve the integration level.

[0037] In a second aspect, the present application provides a multi-mode terminal, comprising an optical physical chip, a receiving assembly and a media access control (MAC) chip.

[0038] The receiving assembly comprises a multi-mode trans-impedance amplifier and N detectors, the multi-mode trans-impedance amplifier comprising a second switch and a trans-impedance amplification unit, the optical physical chip comprising a limiting amplifier, and N is greater than 1.

[0039] The N input terminals of the second switch are respectively electrically connected with one of the N detectors, and the output terminal is electrically connected with the trans-impedance amplification unit, and the trans-impedance amplification unit is electrically connected with the limiting amplifier.

[0040] The second switch is configured to receive a second mode selection signal and control the input terminal of the detector connected by the second mode selection signal to be connected with the output terminal of the second switch.

[0041] In an alternative mode, the transmission rates of the optical signals received by the N detectors are different.

[0042] In a third aspect, the present application provides an optical communication system, comprising an optical line terminal, an optical distribution network and the multi-mode terminal of the first aspect or any of the alternative modes of the first aspect.

[0043] In a fourth aspect, the present application further provides an optical physical chip, comprising a first switch and a driving module.

[0044] The input terminal of the first switch is electrically connected with the driving module.

[0045] The N output terminals of the first switch are respectively electrically connected with one of the N lasers in the optical transmitting assembly, and N is greater than 1.

[0046] The first switch is configured to receive a first mode selection signal and control the in-line end and the out-line end of the first switch to be connected to a laser indicated by the first mode selection signal.

[0047] In an alternative way, the first switch comprises N first sub-switches.

[0048] The first terminal of the driving module is electrically connected to the in-line ends of the N first sub-switches, and the out-line ends of the N first sub-switches are respectively electrically connected to the first connection terminals of the N lasers, wherein the second connection terminals of the N lasers are electrically connected to a reference level, the first connection terminals are anodes, and the second connection terminals are cathodes, or the first connection terminals are cathodes, and the second connection terminals are anodes.

[0049] The N first sub-switches are configured to receive the first mode selection signal, control the in-line end and the out-line end of the first sub-switch of the N first sub-switches to be connected to the laser indicated by the first mode selection signal, and control the in-line end and the out-line end of the other first sub-switches to be disconnected.

[0050] In an alternative way, the first switch comprises N first sub-switches, the N terminals of the driving module are respectively electrically connected to the in-line ends of the N first sub-switches and are configured to be electrically connected to the first connection terminals of the N lasers, and the out-line ends of the N first sub-switches are configured to be electrically connected to the second connection terminals of the N lasers through capacitors, the second connection terminals of the N lasers are electrically connected to a reference level, the first connection terminals are anodes, and the second connection terminals are cathodes, or the first connection terminals are cathodes, and the second connection terminals are anodes.

[0051] The N first sub-switches are configured to receive the first mode selection signal, control the in-line end and the out-line end of the first sub-switch of the N first sub-switches to be disconnected from the laser indicated by the first mode selection signal in parallel, and control the in-line end and the out-line end of the other first sub-switches to be connected.

[0052] In an alternative way, the first switch comprises N second sub-switches and N third sub-switches.

[0053] The first terminal of the driving module is electrically connected to the in-line ends of the N second sub-switches, and the out-line ends of the N second sub-switches are respectively electrically connected to the anodes of the N lasers.

[0054] The second terminal of the driving module is electrically connected with the line-in terminals of the N third sub-switches, the N third sub-switches are used for being electrically connected with the cathodes of the N lasers respectively, and the cathodes of the N lasers are electrically connected with reference levels respectively, and the reference levels connected with the N lasers are different;

[0055] The N second sub-switches are used for receiving the first mode selection signal, controlling the line-in terminal and the line-out terminal of the second sub-switch connected with the laser indicated by the first mode selection signal in the N second sub-switches to be connected, and controlling the line-in terminals and the line-out terminals of the other second sub-switches to be disconnected;

[0056] The N third sub-switches are used for receiving the first mode selection signal, controlling the line-in terminal and the line-out terminal of the third sub-switch connected with the laser indicated by the first mode selection signal in the N third sub-switches to be connected, and controlling the line-in terminals and the line-out terminals of the other third sub-switches to be disconnected.

[0057] In a fifth aspect, the present application further provides a multi-mode trans-impedance amplifier, comprising a second switch and a trans-impedance amplification unit;

[0058] The N line-in terminals of the second switch are used for being electrically connected with one of the N detectors in the receiving assembly respectively, and the line-out terminal is electrically connected with the trans-impedance amplification unit;

[0059] The trans-impedance amplification unit is used for being electrically connected with a limiting amplifier in an optical physics chip;

[0060] The second switch is used for receiving a second mode selection signal, and controlling the line-in terminal of the detector connected with the second mode selection signal to be connected with the line-out terminal of the second switch.

[0061] In an optional mode, the multi-mode trans-impedance amplifier further comprises a mirror voltage detection circuit;

[0062] The mirror voltage detection circuit is used for being electrically connected with a sampling resistor in the receiving assembly;

[0063] The mirror voltage detection circuit is used for detecting the voltage of the sampling resistor, and the size of the voltage is used for indicating the generation of the second mode selection signal.

[0064] In an optional mode, the multi-mode trans-impedance amplifier further comprises a fourth switch;

[0065] The line-in terminal of the fourth switch is electrically connected with the mirror voltage detection circuit, and the N line-out terminals are electrically connected with one of the N detectors respectively;

[0066] The fourth switch is configured to receive the second mode selection signal, and control the outgoing line end of the detector connection indicated by the second mode selection signal to be connected to the incoming line end of the fourth switch.

[0067] In an optional mode, the multi-mode trans-impedance amplifier further comprises a second power supply and a voltage detection unit.

[0068] The second power supply is configured to be electrically connected to the N detectors, and electrically connected to the voltage detection unit, the N detectors are connected in parallel, and the N detectors are connected in parallel to the voltage detection unit, and the working voltages of the N detectors are different.

[0069] The second power supply is configured to receive a voltage value signal, and output a voltage indicated by the voltage value signal.

[0070] The voltage detection unit is configured to detect the voltage output by the second power supply, and the voltage detected by the voltage detection unit is used to indicate the generation of the second mode selection signal; or

[0071] The multi-mode trans-impedance amplifier further comprises a second power supply, a voltage detection unit and a voltage reduction unit.

[0072] The second power supply is configured to be electrically connected to the N detectors, and electrically connected to the voltage reduction unit, the N detectors are connected in parallel, and the N detectors are connected in parallel to the voltage reduction unit, the voltage reduction unit is electrically connected to the voltage detection unit, and the working voltages of the N detectors are different.

[0073] The second power supply is configured to receive a voltage value signal, and output a voltage indicated by the voltage value signal.

[0074] The voltage detection unit is configured to detect the voltage output by the second power supply after passing through the voltage reduction unit.

[0075] In a sixth aspect, the application further provides an optical assembly, comprising a transmitting assembly and a receiving assembly.

[0076] The transmitting assembly comprises N lasers, and each of the N lasers is configured to be connected to one outgoing line end of a first switch in an optical physical chip.

[0077] The receiving assembly comprises the multi-mode trans-impedance amplifier and the N detectors in the fifth aspect or any of the optional modes of the fifth aspect.

[0078] It should be understood that the effect descriptions in the fourth aspect to the sixth aspect and the optional modes are referred to the effect descriptions in the first aspect and the optional modes, and will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0079] Figure 1 is a schematic diagram of a PON system according to one example embodiment of the present application;

[0080] Figure 2 is a schematic diagram of a conventional multi-mode terminal;

[0081] Figure 3 is a schematic diagram of a multi-mode terminal according to one example embodiment of the present application;

[0082] Figure 4 is a schematic diagram of a single-anode implementation of an optical physics chip according to one example embodiment of the present application;

[0083] Figure 5 is a schematic diagram of a single-anode implementation of an optical physics chip according to another example embodiment of the present application;

[0084] Figure 6 is a schematic diagram of a single-cathode implementation of an optical physics chip according to one example embodiment of the present application;

[0085] Figure 7 is a schematic diagram of a package for a transmit assembly according to one example embodiment of the present application;

[0086] Figure 8 is a schematic diagram of a dual-pole implementation of an optical physics chip according to one example embodiment of the present application;

[0087] Figure 9 is a schematic diagram of a dual-pole implementation of an optical physics chip according to another example embodiment of the present application;

[0088] Figure 10 is a schematic diagram of a structure of a drive module according to one example embodiment of the present application;

[0089] Figure 11 is a schematic diagram of a structure of a multi-mode transimpedance amplifier according to one example embodiment of the present application;

[0090] Figure 12 is a schematic diagram of a structure of a multi-mode transimpedance amplifier according to another example embodiment of the present application;

[0091] Figure 13 is a schematic diagram of a structure of a multi-mode transimpedance amplifier according to yet another example embodiment of the present application;

[0092] Figure 14 is a schematic diagram of a structure of a multi-mode transimpedance amplifier according to still another example embodiment of the present application;

[0093] Figure 15 is a schematic diagram of a package for a receive assembly according to one example embodiment of the present application;

[0094] Figure 16 is a schematic diagram of a package for a receive assembly according to another example embodiment of the present application;

[0095] Figure 17 is a schematic diagram of a structure of a multi-mode transimpedance amplifier according to yet another example embodiment of the present application;

[0096] Figure 18 is a schematic diagram of a structure of a multi-mode transimpedance amplifier according to still another example embodiment of the present application;

[0097] Fig. 19 is a schematic diagram of packaging of a receiving component according to another exemplary embodiment of the present application;

[0098] Fig. 20 is a schematic diagram of packaging of a receiving component according to another exemplary embodiment of the present application.

[0099] Fig. 1, an optical physical chip; 2, a transmitting component; 3, a MAC chip; 4, a receiving component; 11, a first switch; 12, a driving module; 13, a limiting amplifier; 111, a first sub-switch; 112, a second sub-switch; 113, a third sub-switch; 21, a laser; 22, a first pedestal; 23, a substrate; 41, a multi-mode trans-impedance amplifier; 42, a photodetector; 43, a sampling resistor; 44, a third switch; 45, a reference level; 46, a first power supply; 47, a second pedestal; 221, a first pin; 222, a second pin; 411, a second switch; 412, a trans-impedance amplification unit; 413, a mirror voltage detection circuit; 414, a fourth switch; 415, a second power supply; 416, a voltage detection unit; 417, a voltage reduction unit; 418, a power supply pin; 419, a power pin; 420, a signal output pin; 421, an RSSI pin; 422, a power receiving pin; 471, a first power supply pin; 472, a signal pin; 473, a first multiplexing pin; 474, a second power supply pin; 475, a second multiplexing pin. DETAILED DESCRIPTION

[0100] In order to make the purpose, technical solutions and advantages of the present application clearer, the embodiments of the present application will be further described in detail below with reference to the drawings.

[0101] In a PON system, an OLT establishes communication links with all ONUs in the system through an optical distribution network (ODN), as shown in Fig. 1. The ODN includes one or more passive splitters.

[0102] At the initial stage of the PON system establishment, one PON system includes a first generation network, but as the large-scale deployment of the PON system, the PON system includes a second generation or more than two generations of network. For example, the PON system includes two generations of network of gigabit-capable PON (GPON) and 10G PON. As the network bandwidth is upgraded, the problem of coexistence of multiple generations of network is involved. Assuming that the current GPON network is upgraded to the 10G PON network, it is not possible to reorganize an ODN, and therefore it is necessary to expand the service on the existing network. At present, the OLT is a multi-mode OLT that can support multiple generations of network. However, the ONU on the user side is also in the upgrading process, which requires the integration of the functions of multiple generations of network into one ONU to obtain a multi-mode ONU, i.e., a multi-mode terminal.

[0103] At present, Fig. 2 provides a two-mode ONU to support a first generation network and a second generation network, which includes a MAC chip, an electronic switch, an optical physical (PHY) chip and a transceiver assembly of each generation network, and a combiner. The MAC chip is connected with the electronic switch, the transceiver assembly of the first generation network includes a first laser, a first transimpedance amplifier and a first receiver, and the transceiver assembly of the second generation network includes a second laser, a second transimpedance amplifier and a second receiver. When the electronic switch controls the MAC chip to be electrically connected with the first optical physical chip, the first optical physical chip drives the first laser to output an optical signal, which is output through the combiner. The combiner receives an external optical signal and outputs it to the first receiver. The first receiver converts the external optical signal into an electrical signal and outputs it to the first transimpedance amplifier. After the first transimpedance amplifier amplifies the electrical signal, it is output to the second optical physical chip for limiting amplification and then output to the MAC chip. When the electronic switch controls the MAC chip to be electrically connected with the second optical physical chip, the second optical physical chip drives the second laser to output an optical signal, which is output through the combiner. The combiner receives an external optical signal and outputs it to the second receiver. The second receiver converts the external optical signal into an electrical signal and outputs it to the second transimpedance amplifier. After the second transimpedance amplifier amplifies the electrical signal, it is output to the second optical physical chip for limiting amplification and then output to the MAC chip.

[0104] As can be seen from Fig. 2, the multi-mode ONU structure is complex, which is a set of transceiver assembly for each generation network, and an optical physical chip for each generation network, and has a low integration degree. Moreover, it needs to include two transimpedance amplifiers, two optical physical chips and an electronic switch, which requires a total of five radio frequency interface chips (RFICs), and has a high cost. Therefore, it is necessary to provide a multi-mode terminal with a high integration degree.

[0105] Based on this, the embodiment of the present application provides a multi-mode terminal, in which optical physical chips of multiple generations of networks are integrated together to improve the integration degree.

[0106] In the embodiment of the present application, the multi-mode terminal can be applied to GPON and 10G PON sharing, can be applied to Ethernet passive optical network (EPON) and 10G EPON sharing, and can be applied to GPON, 10G PON and 50GPON sharing. The embodiment of the present application does not limit the specific application scenarios of the multi-mode terminal. The following describes the scheme by taking the application of the multi-mode terminal to multiple generations of networks as an example.

[0107] FIG. 3 provides a structural schematic diagram of the multi-mode terminal. Referring to FIG. 3, the multi-mode terminal includes an optical physical chip 1, a transmitting assembly 2, a media access control chip 3 (i.e., a MAC chip 3) and a receiving assembly 4. The optical physical chip 1 includes a first switch 11, a driving module 12 and a limiting amplifier 13. The transmitting assembly 2 includes N lasers 21, the transmission rates of the optical signals output by the N lasers 21 are different, N is greater than 1, and the value of N is set according to actual needs, for example, N is equal to 2. The optical physical chip 1 is electrically connected to the MAC chip 3. The first switch 11 includes one incoming line end and multiple outgoing line ends. The one incoming line end is electrically connected to the driving module 12, and the multiple outgoing line ends are respectively electrically connected to one of the multiple lasers 21. The first switch 11 is a mode switching switch. According to a received first mode selection signal, the first switch 11 controls the laser 21 to be connected by the driving module 12. The first mode selection signal is used to select the working mode of the multi-mode terminal. Different lasers 21 work in different working modes. For example, the first switch 11 receives the first mode selection signal, controls the incoming line end of the first switch 11 to be connected to the outgoing line end of the laser 21 indicated by the first mode selection signal, so that when sending uplink data, the MAC chip sends an electrical signal of the uplink data to the optical physical chip 1. The driving module 12 drives the connected laser 21 according to the electrical signal, so that the laser 21 emits an optical signal to send the uplink data. In addition, the multi-mode terminal further includes a combiner. The combiner is arranged on the output optical path of the transmitting assembly 2 and is arranged on the input optical path of the receiving assembly 4.

[0108] The receiving component 4 includes a multi-mode trans-impedance amplifier 41 and N detectors 42, which can be photo diodes (PDs) or the like, and the multi-mode trans-impedance amplifier 41 includes a second switch 411 and a trans-impedance amplification unit 412. The multi-mode trans-impedance amplifier 41 is electrically connected to the limiting amplifier 13. The second switch 411 includes N input lines and one output line, each of the input lines is electrically connected to one of the detectors 42, and the output line is electrically connected to the trans-impedance amplification unit 412. The second switch 411 can control the detectors 42 connected to the trans-impedance amplification unit 412. For example, the second switch 411 receives a second mode selection signal, and the second mode selection signal is used to select the working mode of the multi-mode trans-impedance amplifier 41. In different working modes, the multi-mode trans-impedance amplifier 41 is electrically connected to different detectors 42. The second switch 411 controls the input line of the detector 42 indicated by the second mode selection signal to be connected to the output line of the second switch 411, so that when the detector 42 receives an optical signal, the detector 42 converts the optical signal into an electrical signal, and sends the electrical signal to the second switch 411. The second switch 411 sends the electrical signal to the trans-impedance amplification unit 412, and the trans-impedance amplification unit 412 amplifies the electrical signal to obtain an amplified electrical signal. The trans-impedance amplification unit 412 sends the amplified electrical signal to the limiting amplifier 13. The limiting amplifier 13 limits the electrical signal with excessively high or low voltage in the amplified electrical signal to obtain an electrical signal with limited voltage. The electrical signal with limited voltage is sent to the MAC chip 3.

[0109] With the multi-mode terminal shown in FIG. 3, there are two chips, the multi-mode trans-impedance amplifier 41 and the optical physical chip 1, instead of the original five chips.

[0110] In an optional manner, the laser 21 can be a direct modulation laser (DML) or other lasers.

[0111] In an alternative way, the photophysical chip 1 is a single anode or single cathode control scheme. The first switch 11 includes N first sub-switches 111. The first terminal of the driving module 12 is electrically connected to the line-in terminals of the N first sub-switches 111. The first terminal is one terminal or N terminals. When the first terminal is N terminals, each terminal is connected to the line-in terminal of one first sub-switch 111. The N first sub-switches 111 correspond to the N lasers 21 one by one. The line-out terminal of each first sub-switch 111 is electrically connected to the first connection terminal of one laser 21. The second connection terminals of the N lasers 21 are electrically connected to a reference level, which can be a ground terminal. The N first sub-switches 111 receive the first mode selection signal. Assuming that the first mode selection signal indicates the first laser, the line-in terminal and the line-out terminal of the first sub-switch 111 connected to the first laser are turned on, and the line-in terminals and the line-out terminals of the other first sub-switches 111 are turned off. In this way, since the driving module 12 is electrically connected to the first laser and not electrically connected to the other lasers 21, the driving module 12 can drive the first laser, and the multi-mode terminal is in the working mode corresponding to the first laser, without driving the other lasers. For example, when N equals 2, the two lasers 21 include a first laser and a second laser. The first sub-switch 111 connected to the first laser is turned on, and the first sub-switch 111 connected to the second laser is turned off. Then, the multi-mode terminal is in working mode 1. The first sub-switch 111 connected to the first laser is turned off, and the first sub-switch 111 connected to the second laser is turned on. Then, the multi-mode terminal is in working mode 2.

[0112] For the driving module 12, the signal applied to the laser 21 is an alternating signal. The polarity of the cathode and the anode of the laser 21 is reversed, without affecting the operation. Therefore, the first connection terminal is the anode, and the second connection terminal is the cathode. See FIG. 4 and FIG. 5, which show the case where N equals 2. In FIG. 4, the cathodes of the N lasers are electrically connected to the reference level. In FIG. 5, the second terminal of the driving module 12 is electrically connected to the cathodes of the N lasers 21. The cathodes of the N lasers 21 are connected to the reference level through an isolation element that passes direct current and blocks alternating current.

[0113] Alternatively, the anode and the cathode in the above scheme are reversed. The first connection terminal is the cathode, and the second connection terminal is the anode. The anodes of the N lasers are electrically connected to the reference level. Alternatively, the second terminal of the driving module 12 is electrically connected to the anodes of the N lasers 21. The anodes of the N lasers 21 are connected to the reference level through an isolation element that passes direct current and blocks alternating current.

[0114] The isolation element that passes direct current and blocks alternating current is an inductor or a magnetic bead, etc. The isolation element can eliminate high-frequency interference signals and ensure the stability of the reference level. The isolation element can belong to the single board of the multi-mode terminal.

[0115] Optionally, in the transmitting assembly 2, a bias current is added to each laser 21, the bias current is a direct current bias current, and the direct current bias currents corresponding to different lasers 21 can be different.

[0116] In an optional manner, the optical physics chip 1 is a control single cathode or single anode scheme, the driving module 12 includes N terminals, and the first switch 11 includes N first sub-switches 111. The N terminals correspond to the N first sub-switches 111 one by one, and correspond to the N lasers 21 one by one, each terminal is electrically connected to the input terminal of a first sub-switch 111, and each terminal is electrically connected to the first connection terminal of a laser 21. The output terminals of the N first sub-switches 111 are electrically connected to the second connection terminals of the N lasers 21 through a capacitor, and the capacitor is used to protect the laser 21. If the capacitor is not provided, the laser 21 will be short-circuited, the current will be too large, and the laser 21 can be burned out. The second connection terminals of the N lasers 21 are electrically connected to a reference level, which can be a ground terminal. The N first sub-switches 111 receive the first mode selection signal, assuming that the first laser is indicated by the first mode selection signal, the input terminal and the output terminal of the first sub-switch 111 connected in parallel to the first laser in the N first sub-switches 111 are controlled to be disconnected, and the input terminals and the output terminals of the other first sub-switches 111 are controlled to be connected. In this way, the driving module 12 is electrically connected to the first laser, and the other lasers 21 are bypassed by the parallel first sub-switches 111, so that the driving module 12 can drive the first laser without driving the other lasers. For example, when N is equal to 2, the input terminal and the output terminal of one first sub-switch 111 are disconnected, and the input terminal and the output terminal of the other first sub-switch 111 are connected, so that the laser 21 connected in parallel to the one first sub-switch 111 works normally, and the multi-mode terminal is in working mode 1, and the laser 21 connected in parallel to the other first sub-switch 111 is bypassed.

[0117] For the driving module 12, the signal added to the laser 21 is an alternating current signal, and the polarity of the cathode and the anode of the laser 21 is reversed, which does not affect the work, so the first connection terminal is the anode, and the second connection terminal is the cathode, as shown in FIG. 6, which shows the case where N is equal to 2, or the anode and the cathode in the above scheme are reversed, the first connection terminal is the cathode, and the second connection terminal is the anode.

[0118] Optionally, the second connection terminals of the N lasers 21 are isolated from the reference level by a direct current passing and alternating current blocking isolation element, which is an inductor or a magnetic bead. In FIG. 6, the isolation element is an inductor.

[0119] Optionally, in the transmitting assembly 2, a bias current is added to each laser 21, the bias current is a direct current bias current, and the direct current bias currents corresponding to different lasers 21 can be different.

[0120] Optionally, in FIG. 4 to FIG. 6, each of the N first sub-switches 111 receives a signal with respect to the first mode selection signal. For example, N equals 2, one first sub-switch 111 receives a high level, indicating that the input terminal and the output terminal are connected, and the other first sub-switch 111 receives a low level, indicating that the input terminal and the output terminal are disconnected.

[0121] In an optional way, for the single cathode selection scheme or the single anode selection scheme of the optical physics chip 1, the application also provides a packaging scheme of the emitting assembly 2, as shown in FIG. 7, the emitting assembly 2 further includes a first base 22 and a substrate 23, the N lasers 21 are arranged on the substrate 23, the substrate 23 is arranged on the first base 22, the first base 22 includes N first pins 221, a second pin 222 and a ground pin, the first connection terminal of each laser 21 is electrically connected to the first terminal of the driving module 12 through one first pin 221, different lasers 21 correspond to different first pins 221, the first terminal can be one terminal or N terminals, when the first terminal is N terminals, each terminal is electrically connected to the first connection terminal of one laser 21. The second connection terminal of the N lasers 21 is electrically connected to the second terminal of the driving module 12 through the second pin 222, and the second terminal is one terminal.

[0122] Wherein, the first connection terminal is an anode, and the second connection terminal is a cathode, or the first connection terminal is a cathode, and the second connection terminal is an anode.

[0123] In this way, the second connection terminals of the plurality of lasers 21 are combined into one in the first base 22, only one wire is required for external connection, and one pin is occupied, reducing the signal quality loss caused by multiple wires and improving the integration degree. Moreover, the use of a 4-pin packaging scheme can also reduce costs.

[0124] In an alternative mode, the photophysical chip 1 is a bipolar selection scheme, the bipolar scheme is equivalent to a bipolar output driving signal, see FIG. 8, the first switch 11 includes N second sub-switches 112 and N third sub-switches 113, the first terminal of the driving module 12 is electrically connected with the wire-in end of the N second sub-switches 112, the N second sub-switches 112 correspond to the N lasers 21 one by one, the wire-out end of each second sub-switch 112 is electrically connected with the anode of a laser 21. The second terminal of the driving module 12 is electrically connected with the wire-in end of the N third sub-switches 113, the N third sub-switches 113 correspond to the N lasers 21 one by one, the wire-out end of each third sub-switch 113 is electrically connected with the cathode of a laser 21, the cathodes of the N lasers 21 are respectively electrically connected with reference levels, the reference levels connected by the N lasers 21 are not the same, so there are N reference levels, the N reference levels can be the ground terminal, in FIG. 8, N is equal to 2, the two reference levels include a first reference level and a second reference level. The N second sub-switches 112 receive the first mode selection signal, assuming that the first mode selection signal indicates the laser as the first laser, the wire-in end and the wire-out end of the second sub-switch 112 in series with the first laser are turned on, and the wire-in end and the wire-out end of the other second sub-switches 112 are turned off. The N third sub-switches 113 receive the first mode selection signal, the wire-in end and the wire-out end of the third sub-switch 113 connected with the first laser are turned on, and the other third sub-switches 113 are turned off. In this way, the first terminal outputs the driving signal from the anode of the first laser, and the second terminal inputs the driving signal from the cathode of the first laser, realizing bipolarity. For example, N is equal to 2, the N lasers 21 include a first laser and a second laser, the anode of the first laser is electrically connected with M1 (the second sub-switch 112), the cathode is electrically connected with M2 (the third sub-switch 113), the anode of the second laser is electrically connected with M3 (the second sub-switch 112), and the cathode is electrically connected with M4 (the third sub-switch 113), when the first laser works, the wire-in end and the wire-out end of M1 and M2 are turned on, and the wire-in end and the wire-out end of M3 and M4 are turned off, the multi-mode terminal is in working mode 1, when the second laser works, the wire-in end and the wire-out end of M1 and M2 are turned off, and the wire-in end and the wire-out end of M3 and M4 are turned on, the multi-mode terminal is in working mode 2.

[0125] Optionally, the cathode of each laser 21 is isolated from the reference level by a direct-current passing and alternating-current blocking isolation element, which is an inductor or a magnetic bead.

[0126] Optionally, in the emission assembly 2, a bias current is also added for each laser 21, the bias current is a direct-current bias current, and the direct-current bias currents corresponding to different lasers 21 can be different.

[0127] Optionally, when the photonic chip 1 is a bipolar selection scheme, Figure 9 also provides a schematic diagram of N equal to 3, the cathodes of the 3 lasers 21 are respectively electrically connected with the first reference level, the second reference level and the third reference level.

[0128] In an optional manner, Figure 10 also provides a structural schematic diagram of the driving module 12. The driving module 12 includes a sampling resistor, two triodes and a reference level. The sampling resistor is connected in series with the two triodes, and the two triodes are connected with the reference level. Here, it is only an example of the driving module 12, and the embodiments of the present application are not limited thereto.

[0129] In an optional manner, the first mode selection signal can be triggered and output by the MAC chip 3, other chips of the multi-mode terminal or an external button of the multi-mode terminal. That is, the MAC chip 3 detects the working mode selection instruction, the MAC chip 3 sends the first mode selection signal to the first switch 11, and the first switch 11 receives the first mode selection signal. Alternatively, the other chip of the multi-mode terminal can be a separate chip in the multi-mode terminal, such as a complex programmable logic device (CPLD) and the like, which detects the working mode selection instruction and sends the first mode selection signal to the first switch 11. Alternatively, the multi-mode terminal is provided with a switching button, when the user adjusts the switching button, the first switch 11 will receive the first mode selection signal.

[0130] In an optional manner, Figure 11 provides a connection schematic diagram of the multi-mode transimpedance amplifier 41 and the detector 42. Referring to Figure 11, a case of N equal to 2 is provided, the second switch 411 includes N input terminals and one output terminal, the N input terminals correspond to the N detectors 42 one by one, each input terminal is electrically connected with one detector 42, and the output terminal is electrically connected with the transimpedance amplification unit 412, and the N detectors 42 respectively correspond to a power supply, and in Figure 11, N is equal to 2, and the two power supplies include a first power supply and a second power supply. Here, the transimpedance amplification unit 412 has N input terminals, the second switch 411 has N input terminals, the N input terminals are respectively electrically connected with one of the N input terminals, and are respectively electrically connected with one of the N detectors 42. In this way, the multi-mode transimpedance amplifier 41 instructs the second switch 411 according to the second mode selection signal, when switching to one of the detectors, the multi-mode transimpedance amplifier 41 works in a working mode, and when switching to another detector, the multi-mode transimpedance amplifier 41 works in another working mode, thereby realizing the switching of the network.

[0131] Optionally, the transimpedance amplification unit 412 can include one amplifier or a plurality of cascaded amplifiers.

[0132] Optionally, the second switch 411 receives the second mode selection signal from the MAC chip 3, the optical physical chip 1, other chips of the multi-mode terminal or an external button.

[0133] Optionally, amplifiers can be separately arranged at the N input terminals of the transimpedance amplification unit 412 to amplify the electrical signals output by the detectors 42.

[0134] In an optional mode, the input terminal of the second mode selection signal is multiplexed with other terminals of the multi-mode transimpedance amplifier 41, as shown in FIGS. 12-14, the input terminal of the second mode selection signal is multiplexed with the RSSI terminal. FIG. 12 shows the case where N equals 2, the multi-mode transimpedance amplifier 41 further comprises a mirror voltage detection circuit 413 and a fourth switch 414, and the receiving assembly 4 further comprises a sampling resistor 43, a third switch 44 and N reference levels 45, the RSSI terminal functions to mirror the photocurrent of the detector 42 in the multi-mode transimpedance amplifier 41, the current point passes through the sampling resistor 43, and the current-to-voltage conversion is performed to obtain the optical power of the detector 42. The incoming line terminal of the fourth switch 414 is electrically connected with the mirror voltage detection circuit 413, the N outgoing line terminals are respectively electrically connected with one of the N detectors 42, the mirror voltage detection circuit 413 is electrically connected with the sampling resistor 43, the incoming line terminal of the third switch 44 is electrically connected with the sampling resistor 43, and the N outgoing line terminals are respectively electrically connected with one of the N reference levels 45, the voltages of the N reference levels 45 correspond to the N detectors 42 one by one, and the voltages of the N reference levels 45 are different, which are used as the reference levels for RSSI sampling. For example, one of the two reference levels 45 is 0V, and the other is 1.8V.

[0135] Since the third switch 44 is outside the multi-mode trans-impedance amplifier 41, the second mode selection signal can indicate the selected operation mode by instructing the third switch 44 to select different reference levels of the RSSI sampling. Specifically, the voltage of the RSSI V = RSSI photocurrent * sampling resistor 43 + reference level. Thus, the voltage of the detected RSSI is different when the reference levels 45 connected to the third switch 44 are different. When switching the operation mode, the level selection signal is input to the third switch 44 to select the specified reference level 45 connected to the third switch 44, and the mirror voltage detection circuit can detect the specified voltage based on the voltage of the RSSI to instruct the detector 42 connected to the second switch 411. For example, the mirror voltage detection circuit 413 transmits the detected voltage to the MAC chip 3, other chips of the multi-mode terminal, or the optical physical chip 1, etc., and the chip receiving the voltage determines the second mode selection signal based on the voltage. For example, when the chip receiving the voltage determines that the voltage is greater than a certain threshold, it is determined that the multi-mode terminal operates in operation mode 1, and the second mode selection signal indicates operation mode 1. When the voltage is less than the certain threshold, it is determined that the multi-mode terminal operates in operation mode 2, and the second mode selection signal indicates operation mode 2. The chip receiving the voltage sends the second mode selection signal to the fourth switch 414 and the second switch 411. The fourth switch 414 receives the second mode selection signal and connects the input terminal of the detector 42 indicated by the second mode selection signal to the output terminal of the fourth switch 414 based on the second mode selection signal, thereby realizing the selection of the detector 42. The mirror voltage detection circuit 413 supplies power to the detector 42 connected to the fourth switch 414. The second switch 411 receives the second mode selection signal and electrically connects the detector 42 indicated by the second mode selection signal to the trans-impedance amplification unit 412 based on the second mode selection signal.

[0136] The mirror voltage detection circuit 413 includes a low-dropout regulator (LDO), a first transistor, a second transistor, and a voltage detection unit. The LDO is electrically connected to the first transistor, and the LDO is electrically connected to the second transistor. The first transistor is electrically connected to the input terminal of the second switch 411, and the first transistor is electrically connected to the second transistor. The two output terminals of the second transistor are connected to the RSSI terminal, and the voltage detection unit is connected to the RSSI terminal. The voltage detection unit detects the voltage of the RSSI terminal.

[0137] It should be noted that the selection of multiple reference levels 45 needs to have enough space to ensure that the reference levels 45 connected to the third switch 44 can be distinguished under the condition that the voltage of the RSSI takes the maximum photocurrent. For example, N is equal to 2, and the two reference levels 45 include V1 and V2. Assuming that V1 < V2, the values of V1 and V2 satisfy that the maximum photocurrent of the RSSI * the sampling resistor is less than V2 - V1.

[0138] In addition, each reference level 45 can include one level or a combination of multiple levels.

[0139] In an alternative, when the multi-mode trans-impedance amplifier 41 adopts the structure shown in Figure 12, the application also provides a packaging method of the receiving assembly 4, as shown in Figure 15, which shows the packaging scheme when N equals 2. The receiving assembly 4 further includes a second base 47 and a capacitor. The second base 47 includes a first power supply pin 471, signal pins 472, a first multiplexing pin 473, and a ground pin. The first power supply pin 471 is used to supply power to the multi-mode trans-impedance amplifier 41. The signal pins 472 are two pins used to input a pair of signals to the multi-mode trans-impedance amplifier 41. The first multiplexing pin 473 is a multiplexing pin of the RSSI pin and the working mode selection pin, which is used to receive the level selection signal. The multi-mode trans-impedance amplifier 41 further includes a power supply pin 418, N power supply pins 419, signal output pins 420, and an RSSI pin 421.

[0140] The first power supply pin 471 is electrically connected to the power supply pin 418 through a capacitor. The signal pins 472 are electrically connected to the signal output pins 420. The first multiplexing pin 473 is electrically connected to the RSSI pin 421. Each power supply pin 419 is electrically connected to one detector 42. Different power supply pins 419 are connected to different detectors 42.

[0141] In this way, when N equals 2, a 5-pin packaging scheme is adopted, which can reduce the cost and improve the integration.

[0142] Referring to FIG. 13, the difference between FIG. 13 and FIG. 12 is that, except for one of the plurality of detectors 42 being powered by the multi-mode trans-impedance amplifier 41, the other detectors 42 are avalanche photo diodes (APDs) or other types of detectors that need to be connected to an external high-voltage driver and cannot be powered by the multi-mode trans-impedance amplifier 41. In FIG. 13, the receiving assembly 4 further includes N-1 first power supply sources 46, the N detectors 42 are divided into one first detector and N-1 second detectors, the mirror voltage detection circuit 413 is electrically connected to the first detector, and the N-1 first power supply sources 46 are electrically connected to the N-1 second detectors one by one. Since the third switch 44 is outside the multi-mode trans-impedance amplifier 41, the second mode selection signal can be used to indicate the different reference levels of the RSSI sampling by indicating the third switch 44 to select the working mode. Specifically, the voltage V of the RSSI = the RSSI photocurrent * the sampling resistor 43 + the reference level. In this way, when the reference levels 45 connected to the third switch 44 are different, the detected voltage of the RSSI is different, and when the working mode is switched, the level selection signal is input to the third switch 44 to select the specified reference level 45 connected to the third switch 44, and the mirror voltage detection circuit can detect the specified voltage to indicate the detector 42 connected to the second switch 411 based on the voltage of the RSSI. For example, the mirror voltage detection circuit 413 transmits the detected voltage to the MAC chip 3, other chips of the multi-mode terminal, or the optical physics chip 1, etc., and the chip receiving the voltage determines the second mode selection signal based on the voltage and sends the second mode selection signal to the second switch 411. The second switch 411 receives the second mode selection signal and electrically connects the detector 42 indicated by the second mode selection signal to the trans-impedance amplification unit 412 based on the second mode selection signal.

[0143] In an optional manner, in the case of using the structure shown in FIG. 13 for the multi-mode trans-impedance amplifier 41, the application further provides a packaging manner of the receiving assembly 4, referring to FIG. 16, the difference between FIG. 16 and FIG. 15 is that, since the N-1 second detectors of the N detectors 42 need to be externally powered, the second base 47 further includes N-1 second power supply pins 474, each of which is used to power one second detector.

[0144] In this way, in the case of N equaling 2, the packaging scheme of 6 pins can reduce the cost and improve the integration.

[0145] Referring to FIG. 14, the difference between FIG. 14 and FIG. 13 is that the plurality of detectors 42 are not powered by the multi-mode trans-impedance amplifier 41, for example, the plurality of detectors 42 are APDs or other types of detectors that need to be connected to an external high-voltage driver and cannot be powered by the multi-mode trans-impedance amplifier 41. In FIG. 14, the receiving assembly 4 further includes N first power supply sources 46, the N first power supply sources 46 correspond to the N detectors 42 one-to-one, and each first power supply source 46 is electrically connected to one detector 42. The remaining description is referred to the description of FIG. 13, which will not be repeated here.

[0146] In an optional manner, in the case that the multi-mode trans-impedance amplifier 41 adopts the structure shown in FIG. 14, the application further provides a packaging manner of the receiving assembly 4. Since the N detectors 42 need to be externally powered, the second base 47 further includes N second power supply pins 474, each second power supply pin 474 is used to power one detector 42.

[0147] FIG. 17 provides a multiplexing manner of the power supply terminal and the input terminal of the second mode selection signal. Referring to FIG. 17, the N detectors 42 can work at a voltage greater than a certain voltage and have comparable performance. For example, the detector 42 can work at 3V, 5V and 10V, and thus different working modes can be represented by applying different voltages to the detector 42. Specifically, the multi-mode trans-impedance amplifier 41 further includes a second power supply source 415, a voltage detection unit 416 and a voltage reduction unit 417, the second power supply source 415 is electrically connected to the N detectors 42 and is electrically connected to the voltage reduction unit 417, the plurality of detectors 42 are connected in parallel and are connected in parallel to the voltage reduction unit 417. The voltage reduction unit 417 is electrically connected to the voltage detection unit 416, and the voltage detection unit 416 detects the voltage of the voltage output by the second power supply source 415 after being reduced by the voltage reduction unit 417.

[0148] When the network is switched to the first network, a voltage value signal is input to the second power supply 415, which indicates the voltage used by the detector 42 of the first network. The second power supply 415 receives the voltage value signal and outputs the voltage indicated by the voltage value signal. The plurality of detectors 42 are connected in parallel and are connected in parallel with the voltage reduction unit 417, which means that the voltage at the input end of the voltage reduction unit 417 is the voltage output by the second power supply 415. The voltage detection unit 416 detects the voltage after the voltage passes through the voltage reduction unit 417, and the detected voltage is used to indicate the generation of the second mode selection signal. For example, N is equal to 2, the N detectors 42 include a first detector and a second detector, the voltage required by the first detector is greater than the voltage required by the second detector, and when the voltage detected by the voltage detection unit 416 is less than the target threshold value, it indicates that the second detector requires the voltage output by the second power supply 415, indicating that the second detector works, and the multi-mode terminal is in working mode 2, and vice versa. The output is the voltage required by the first detector, indicating that the first detector works, and the multi-mode terminal is in working mode 1.

[0149] Optionally, in the case where the voltage output by the second power supply 415 exceeds the voltage that the multi-mode transimpedance amplifier 41 can withstand, the voltage reduction unit 417 can divide the voltage so that the divided voltage enters the voltage detection unit 416 for detection. In this way, the voltage reduction unit 417 can not exist. Referring to FIG. 18, then the voltage detected by the voltage detection unit 416 is the voltage output by the second power supply 415.

[0150] Optionally, the voltage reduction unit 417 includes a resistor R1 and a resistor R2, the values of the resistor R1 and the resistor R2 are set according to actual needs, assuming that the voltage at the left end of the resistor R1 is V1, and the voltage detected by the voltage detection unit 416 is represented as V2, V2 = V1 * R2 / (R1 + R2).

[0151] In an optional manner, in the case where the multi-mode transimpedance amplifier 41 adopts the structure shown in FIGS. 17 and 18, the application also provides a packaging manner of the receiving assembly 4, referring to FIG. 19, which shows a packaging scheme in the case where N is equal to 2. The receiving assembly 4 further includes a second base 47 and a capacitor. The second base 47 includes a first power supply pin 471, a signal pin 472, a second multiplexing pin 475, and a ground pin. The first power supply pin 471 is used to supply power to the multi-mode transimpedance amplifier 41. The signal pin 472 is two pins, which are used to output a pair of signals by the multi-mode transimpedance amplifier 41. The second multiplexing pin 475 is a multiplexing pin of the power supply pin and the working mode selection pin, which is used to receive the voltage value signal and supply power to each detector 42. The multi-mode transimpedance amplifier 41 further includes a power supply pin 418, N power supply pins 419, a signal output pin 420, and a power supply receiving pin 422.

[0152] The first power supply pin 471 is electrically connected to the power supply pin 418 through a capacitor, the signal pin 472 is electrically connected to the signal output pin 420, and the second multiplexing pin 475 is electrically connected to the power supply receiving pin 422. Each power supply pin 419 is electrically connected to one detector 42, and different power supply pins 419 are electrically connected to different detectors 42.

[0153] In this way, in the case of N equal to 2, the 5-pin packaging scheme can reduce the cost and improve the integration.

[0154] In another optional manner, in the case of adopting the structure shown in FIGS. 17 and 18 for the multi-mode transimpedance amplifier 41, the application also provides a packaging manner of the receiving assembly 4, as shown in FIG. 20, which shows the packaging scheme in the case of N equal to 2. The difference from FIG. 19 is that, in FIG. 19, the second multiplexing pin 475 is connected to the detector 42 through the power supply receiving pin 422, and in FIG. 20, the second multiplexing pin 475 is directly connected to the detector 42.

[0155] In the above multi-mode transimpedance amplifiers 41, the input terminal of the second mode selection signal is multiplexed with the existing terminal, without the need to add an additional mode switching pin, and the structure is simple. In other embodiments, the input terminal of the second mode selection signal can also be independent of other terminals and not multiplexed with other terminals.

[0156] It should be noted that, in the multi-mode transimpedance amplifier 41, the input and output of the transimpedance amplification unit 412 are a pair of signals, which are represented as TIA out+ and TIA in-, respectively.

[0157] It should be further noted that, in the application, the multi-mode terminal can also be used in a redundant backup scenario. For example, the wavelengths of the optical signals transmitted by the two lasers in the multi-mode terminal are the same and are redundant to each other, and the wavelengths of the optical signals received by the two detectors in the multi-mode terminal are the same and are redundant to each other.

[0158] The application also provides an optical communication system, which includes an optical line terminal, an optical distribution network, and any one of the multi-mode terminals described above. The optical line terminal is connected to the optical distribution network, and the optical distribution network is connected to the multi-mode terminal.

[0159] It should be noted that, in the application, for the multi-mode terminal, only the transmitting assembly 2 can adopt the scheme of the application, the receiving assembly can adopt the scheme of the multi-generation network corresponding to multiple sets of assemblies, only the receiving assembly 4 can adopt the scheme of the application, the transmitting assembly can adopt the scheme of the multi-generation network corresponding to multiple sets of assemblies, or both the transmitting assembly 2 and the receiving assembly 4 can adopt the scheme of the application.

[0160] The terms "first" and "second," and the like, used in the specification are used to differentiate between like or similar items or elements having substantially the same function and are not intended to be limiting in logic or chronological order. It is also to be understood that, although the terms "first" and "second" and the like can be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first switch could be termed a second switch, and, similarly, a second switch could be termed a first switch, without departing from the scope of the various examples. The first switch and the second switch can both be switches, and in some cases, can be separate and distinct switches.

[0161] The above description is only exemplary implementation of the present application, but the protection scope of the present application is not limited thereto, any skilled in the art person within the technical scope disclosed by the present application can easily think of various equivalent modifications or replacements, and these modifications or replacements should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A multi-mode terminal, characterized by The optical physical chip (1), the transmitting component (2) and the media access control (MAC) chip (3); The optical physical chip (1) comprises a first switch (11) and a driving module (12), the transmitting component (2) comprises N lasers (21), the incoming line end of the first switch (11) is electrically connected with the driving module (12), N outgoing line ends of the first switch (11) are respectively electrically connected with one of the N lasers (21), the optical physical chip (1) is electrically connected with the MAC chip (3), and N is greater than 1; The first switch (11) is used for receiving a first mode selection signal and controlling the incoming line end and the outgoing line end of the laser (21) indicated by the first mode selection signal to be connected.

2. The multi-mode terminal of claim 1, wherein, The first switch (11) comprises N first sub-switches (111); The first terminal of the driving module (12) is electrically connected with the incoming line ends of the N first sub-switches (111), and the outgoing line ends of the N first sub-switches (111) are respectively electrically connected with the first connection terminals of one of the N lasers (21); The second connection terminals of the N lasers (21) are electrically connected with a reference level, the first connection terminal is an anode, and the second connection terminal is a cathode, or the first connection terminal is a cathode, and the second connection terminal is an anode; The N first sub-switches (111) are used for receiving the first mode selection signal, controlling the incoming line end and the outgoing line end of the first sub-switch (111) connected with the laser (21) indicated by the first mode selection signal to be connected, and controlling the incoming line end and the outgoing line end of other first sub-switches (111) to be disconnected.

3. The multimode terminal of claim 2, wherein, The second terminal of the driving module (12) is electrically connected with the second connection terminals of the N lasers (21); The second connection terminals of the N lasers (21) are electrically connected with the reference level through a direct-current passing and alternating-current blocking isolation element.

4. The multi-mode terminal of claim 1, wherein, The first switch (11) comprises N first sub-switches (111), N terminals of the driving module (12) are respectively electrically connected with the incoming line end of one of the N first sub-switches (111) and the first connection terminal of one of the N lasers (21), the outgoing line ends of the N first sub-switches (111) are electrically connected with the second connection terminals of the N lasers (21) through capacitors, the second connection terminals of the N lasers (21) are electrically connected with a reference level, the first connection terminal is an anode, and the second connection terminal is a cathode, or the first connection terminal is a cathode, and the second connection terminal is an anode; The N first sub-switches (111) are used for receiving the first mode selection signal, controlling the incoming line end and the outgoing line end of the first sub-switch (111) connected with the laser (21) indicated by the first mode selection signal to be disconnected, and controlling the incoming line end and the outgoing line end of other first sub-switches (111) to be connected.

5. The multi-mode terminal of claim 1, wherein, The first switch (11) comprises N second sub-switches (112) and N third sub-switches (113); A first terminal of the driving module (12) is electrically connected with incoming lines of the N second sub-switches (112), outgoing lines of the N second sub-switches (112) are respectively electrically connected with anodes of one laser (21) in the N lasers (21); A second terminal of the driving module (12) is electrically connected with incoming lines of the N third sub-switches (113), the N third sub-switches (113) are respectively electrically connected with cathodes of one laser (21) in the N lasers (21), the cathodes of the N lasers (21) are respectively electrically connected with reference levels, and the reference levels connected with the N lasers (21) are different; The N second sub-switches (112) are configured to receive the first mode selection signal, control the incoming line and the outgoing line of the second sub-switch (112) connected with the laser (21) indicated by the first mode selection signal to be turned on, and control the incoming line and the outgoing line of other second sub-switches (112) to be turned off; The N third sub-switches (113) are configured to receive the first mode selection signal, control the incoming line and the outgoing line of the third sub-switch (113) connected with the laser (21) indicated by the first mode selection signal to be turned on, and control the incoming line and the outgoing line of other third sub-switches (113) to be turned off.

6. The multimode terminal according to any one of claims 1 to 5, characterized by The first switch (11) is configured to receive the first mode selection signal from the MAC chip (3); or The first switch (11) is configured to receive the first mode selection signal input into the multi-mode terminal.

7. The multimode terminal according to any one of claims 1 to 6, characterized by The multi-mode terminal further comprises a receiving assembly (4), the receiving assembly (4) comprises a multi-mode trans-impedance amplifier (41) and N detectors (42), the multi-mode trans-impedance amplifier (41) comprises a second switch (411) and a trans-impedance amplification unit (412), and the optical physical chip (1) further comprises a limiting amplifier (13); N incoming lines of the second switch (411) are respectively electrically connected with one detector (42) in the N detectors (42), an outgoing line is electrically connected with the trans-impedance amplification unit (412), and the trans-impedance amplification unit (412) is electrically connected with the limiting amplifier (13); The second switch (411) is configured to receive a second mode selection signal, and control the incoming line of the detector (42) connected with the second mode selection signal to be turned on with the outgoing line of the second switch (411).

8. The multi-mode terminal of claim 7, wherein, The multi-mode trans-impedance amplifier (41) further comprises a mirror voltage detection circuit (413), and the receiving assembly (4) further comprises a sampling resistor (43), a third switch (44) and N reference levels (45); The mirror voltage detection circuit (413) is electrically connected with the sampling resistor (43), the third switch (44) is electrically connected with the sampling resistor (43) at the inlet end, N outlet ends are electrically connected with one of the N reference levels (45) respectively, the voltage of the N reference levels (45) corresponds to the N detectors (42) one by one, and the voltages of the N reference levels (45) are different; The third switch (44) is used for receiving a level selection signal, and connecting the outlet end of the reference level (45) indicated by the level selection signal with the inlet end of the third switch (44); The mirror voltage detection circuit (413) is used for detecting the voltage of the sampling resistor (43), and the voltage is used for indicating generation of the second mode selection signal.

9. The multi-mode terminal of claim 8, wherein, The multi-mode trans-impedance amplifier (41) further comprises a fourth switch (414); The inlet end of the fourth switch (414) is electrically connected with the mirror voltage detection circuit (413), and N outlet ends are electrically connected with one of the N detectors (42) respectively; The fourth switch (414) is used for receiving the second mode selection signal, and controlling the outlet end of the detector (42) indicated by the second mode selection signal to be connected with the inlet end of the fourth switch (414).

10. The multi-mode terminal of claim 8, wherein, The receiving assembly (4) further comprises N-1 first power supplies (46), and the N detectors (42) comprise one first detector and N-1 second detectors; The mirror voltage detection circuit (413) is electrically connected with the first detector, and the N-1 first power supplies (46) are electrically connected with the N-1 second detectors one by one; or The receiving assembly (4) further comprises N first power supplies (46), and the N detectors (42) are electrically connected with one of the N first power supplies (46) respectively.

11. The multi-mode terminal of claim 7, wherein, The multi-mode trans-impedance amplifier (41) further comprises a second power supply (415) and a voltage detection unit (416); The second power supply (415) is electrically connected with the N detectors (42) and the voltage detection unit (416), the N detectors (42) are connected in parallel and connected in parallel with the voltage detection unit (416), and the working voltages of the N detectors (42) are different; The second power supply (415) is used for receiving a voltage value signal and outputting a voltage indicated by the voltage value signal; The voltage detection unit (416) is used for detecting the voltage output by the second power supply (415), and the voltage detected by the voltage detection unit (416) is used for indicating generation of the second mode selection signal; or The multi-mode trans-impedance amplifier (41) further comprises a second power supply (415), a voltage detection unit (416) and a voltage reduction unit (417); The second power supply (415) is electrically connected with the N detectors (42) and the voltage reduction unit (417), the N detectors (42) are connected in parallel and connected in parallel with the voltage reduction unit (417), the voltage reduction unit (417) is electrically connected with the voltage detection unit (416), and the working voltages of the N detectors (42) are different; The second power supply (415) is configured to receive a voltage value signal and output a voltage indicated by the voltage value signal; The voltage detection unit (416) is configured to detect the voltage of the voltage output by the second power supply (415) after passing through the voltage reduction unit (417).

12. The multimode terminal according to any one of claims 2 to 4, characterized by The transmitting assembly (2) further comprises a first base (22), and the first base (22) comprises N first pins (221) and a second pin (222); The first connection terminals of the N lasers (21) are electrically connected with the first terminals of the driving module (12) through one of the N first pins (221) respectively; The second connection terminals of the N lasers (21) are electrically connected with the second terminals of the driving module (12) through the second pin (222).

13. The multi-mode terminal of claim 9, wherein, The receiving assembly (4) further comprises a second base (47), and the second base (47) comprises a first power supply pin (471), a signal pin (472) and a first multiplexing pin (473); and the multi-mode trans-impedance amplifier (41) further comprises a power supply pin (418), N power supply pins (419), a signal output pin (420) and an RSSI pin (421); The first power supply pin (471) is electrically connected with the power supply pin (418), the signal pin (472) is electrically connected with the signal output pin (420), and the first multiplexing pin (473) is electrically connected with the RSSI pin (421); The N power supply pins (419) are respectively electrically connected with one of the N detectors (42); The first multiplexing pin (473) is configured to receive the level selection signal.

14. The multi-mode terminal of claim 10, wherein, The receiving assembly (4) further comprises a second base (47), and the second base (47) comprises a first power supply pin (471), N-1 second power supply pins (474), a signal pin (472) and a first multiplexing pin (473); and the multi-mode trans-impedance amplifier (41) further comprises a power supply pin (418), a power supply pin (419), a signal output pin (420) and an RSSI pin (421); The first power supply pin (471) is electrically connected with the power supply pin (418), the power supply pin (419) is electrically connected with the first detector, the N-1 second power supply pins (474) are respectively electrically connected with one of the N-1 second detectors, the signal pin (472) is electrically connected with the signal output pin (420), and the first multiplexing pin (473) is electrically connected with the RSSI pin (421); The first multiplexing pin (473) is configured to receive the level selection signal.

15. The multi-mode terminal of claim 10, wherein, The receiving component (4) further comprises a second base (47), the second base (47) comprising a first power supply pin (471), N second power supply pins (474), a signal pin (472) and a first multiplexing pin (473), the multi-mode trans-impedance amplifier (41) further comprising a power supply pin (418), a signal output pin (420) and an RSSI pin (421); The first power supply pin (471) is electrically connected with the power supply pin (418), the N second power supply pins (474) are respectively electrically connected with one of the N detectors (42), the signal pin (472) is electrically connected with the signal output pin (420), and the first multiplexing pin (473) is electrically connected with the RSSI pin (421); The first multiplexing pin (473) is configured to receive the level selection signal.

16. The multi-mode terminal of claim 11, wherein, The receiving component (4) further comprises a second base (47), the second base (47) comprising a first power supply pin (471), a signal pin (472) and a second multiplexing pin (475), the multi-mode trans-impedance amplifier (41) further comprising a power supply pin (418) and a signal output pin (420); The first power supply pin (471) is electrically connected with the power supply pin (418), the signal pin (472) is electrically connected with the signal output pin (420), and the second multiplexing pin (475) is electrically connected with each of the N detectors (42); The second multiplexing pin (475) is configured to receive the voltage value signal and supply power for the each detector (42).

17. A multi-mode terminal, characterized by The optical physical chip (1), the receiving component (4) and the media access control (MAC) chip (3) are included. The receiving component (4) comprises a multi-mode trans-impedance amplifier (41) and N detectors (42), the multi-mode trans-impedance amplifier (41) comprises a second switch (411) and a trans-impedance amplification unit (412), the optical physical chip (1) comprises a limiting amplifier (13), and N is greater than 1; N incoming lines of the second switch (411) are respectively electrically connected with one of the N detectors (42), an outgoing line is electrically connected with the trans-impedance amplification unit (412), and the trans-impedance amplification unit (412) is electrically connected with the limiting amplifier (13); The second switch (411) is configured to receive a second mode selection signal and control the incoming line connected with the detector (42) indicated by the second mode selection signal to be connected with the outgoing line of the second switch (411).

18. An optical communication system, characterized by The optical line terminal, the optical distribution network and the multi-mode terminal according to any one of claims 1 to 17 are included.

19. An optical physics chip, characterized by, The first switch (11) and the driving module (12) are included. An incoming line of the first switch (11) is electrically connected with the driving module (12). The N output terminals of the first switch (11) are electrically connected to one of the N lasers (21) in the light emitting component (2) respectively, and N is greater than 1; The first switch (11) is configured to receive a first mode selection signal and control the connection between the input terminal and the output terminal of the laser (21) indicated by the first mode selection signal.

20. The photonic chip of claim 19, wherein, The first switch (11) comprises N first sub-switches (111); The first terminal of the driving module (12) is electrically connected to the input terminals of the N first sub-switches (111), and the output terminals of the N first sub-switches (111) are respectively electrically connected to the first connection terminals of the N lasers (21), wherein the second connection terminals of the N lasers (21) are electrically connected to a reference level, the first connection terminal is an anode, and the second connection terminal is a cathode, or the first connection terminal is a cathode, and the second connection terminal is an anode; The N first sub-switches (111) are configured to receive the first mode selection signal, control the connection between the input terminal and the output terminal of the first sub-switch (111) of the laser (21) indicated by the first mode selection signal in the N first sub-switches (111), and control the disconnection of the input terminal and the output terminal of the other first sub-switch (111).

21. The photonic chip of claim 19, wherein, The first switch (11) comprises N first sub-switches (111), and the N terminals of the driving module (12) are respectively electrically connected to the input terminals of the N first sub-switches (111) and are configured to be electrically connected to the first connection terminals of the N lasers (21); the output terminals of the N first sub-switches (111) are configured to be electrically connected to the second connection terminals of the N lasers (21) through capacitors, the second connection terminals of the N lasers (21) are electrically connected to a reference level, the first connection terminal is an anode, and the second connection terminal is a cathode, or the first connection terminal is a cathode, and the second connection terminal is an anode; The N first sub-switches (111) are configured to receive the first mode selection signal, control the disconnection of the input terminal and the output terminal of the first sub-switch (111) of the laser (21) indicated by the first mode selection signal in the N first sub-switches (111), and control the connection of the input terminal and the output terminal of the other first sub-switch (111).

22. The photonic chip of claim 19, wherein, The first switch (11) comprises N second sub-switches (112) and N third sub-switches (113); The first terminal of the driving module (12) is electrically connected to the input terminals of the N second sub-switches (112), and the output terminals of the N second sub-switches (112) are respectively electrically connected to the anodes of the N lasers (21); A second terminal of the driving module (12) is electrically connected with a wire-in end of the N third sub-switches (113), the N third sub-switches (113) are used for being electrically connected with a cathode of one of the N lasers (21) respectively, the cathodes of the N lasers (21) are electrically connected with reference levels respectively, and the reference levels connected with the N lasers (21) are different; The N second sub-switches (112) are used for receiving the first mode selection signal, controlling the wire-in end and the wire-out end of the second sub-switch (112) connected with the laser (21) indicated by the first mode selection signal to be connected, and controlling the wire-in end and the wire-out end of other second sub-switches (112) to be disconnected; The N third sub-switches (113) are used for receiving the first mode selection signal, controlling the wire-in end and the wire-out end of the third sub-switch (113) connected with the laser (21) indicated by the first mode selection signal to be connected, and controlling the wire-in end and the wire-out end of other third sub-switches (113) to be disconnected.

23. A multi-mode transimpedance amplifier, comprising: The second switch (411) and the trans-impedance amplification unit (412) are included; N wire-in ends of the second switch (411) are used for being electrically connected with one of the N detectors (42) in the receiving assembly (4) respectively, and the wire-out end is electrically connected with the trans-impedance amplification unit (412); The trans-impedance amplification unit (412) is used for being electrically connected with the limiting amplifier (13) in the optical physics chip; The second switch (411) is used for receiving a second mode selection signal, and controlling the wire-in end connected with the detector (42) indicated by the second mode selection signal to be connected with the wire-out end of the second switch (411).

24. The multi-mode transimpedance amplifier of claim 23, wherein, The multi-mode trans-impedance amplifier further includes a mirror voltage detection circuit (413); The mirror voltage detection circuit (413) is used for being electrically connected with the sampling resistor (43) in the receiving assembly (4); The mirror voltage detection circuit (413) is used for detecting the voltage of the sampling resistor (43), and the size of the voltage is used for indicating the generation of the second mode selection signal.

25. The multi-mode transimpedance amplifier of claim 24, wherein, The multi-mode trans-impedance amplifier (41) further includes a fourth switch (414); A wire-in end of the fourth switch (414) is electrically connected with the mirror voltage detection circuit (413), and N wire-out ends are electrically connected with one of the N detectors (42) respectively; The fourth switch (414) is used for receiving the second mode selection signal, and controlling the wire-out end connected with the detector (42) indicated by the second mode selection signal to be connected with the wire-in end of the fourth switch (414).

26. The multi-mode terminal of claim 23, wherein, The multi-mode trans-impedance amplifier (41) further includes a second power supply (415) and a voltage detection unit (416); The second power supply (415) is configured to be electrically connected with the N detectors (42) and the voltage detection unit (416), the N detectors (42) are connected in parallel and with the voltage detection unit (416), and the working voltages of the N detectors (42) are different; The second power supply (415) is configured to receive a voltage value signal and output a voltage indicated by the voltage value signal; The voltage detection unit (416) is configured to detect a voltage output by the second power supply (415), and the voltage detected by the voltage detection unit (416) is used to indicate generation of the second mode selection signal; or The multi-mode trans-impedance amplifier (41) further comprises a second power supply (415), a voltage detection unit (416), and a voltage reduction unit (417); The second power supply (415) is configured to be electrically connected with the N detectors (42) and the voltage reduction unit (417), the N detectors (42) are connected in parallel and with the voltage reduction unit (417), the voltage reduction unit (417) is electrically connected with the voltage detection unit (416), and the working voltages of the N detectors (42) are different; The second power supply (415) is configured to receive a voltage value signal and output a voltage indicated by the voltage value signal; The voltage detection unit (416) is configured to detect a voltage output by the second power supply (415) after passing through the voltage reduction unit (417).

27. A light assembly characterized by, The optical receiver (1) comprises a transmitting assembly (2) and a receiving assembly (4); The transmitting assembly (2) comprises N lasers (21), each of the N lasers (21) is configured to be connected with one outgoing terminal of the first switch (11) in the optical physical chip (1); The receiving assembly (4) comprises the multi-mode trans-impedance amplifier (41) and the N detectors (42) according to any one of claims 23 to 26.

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