Optical transmitter, optical network unit and optical transmission method

Abstract

The embodiments of the present application provide an optical transmitter, an optical network unit, and an optical transmission method to solve the problem of increased latency. By setting two transmission modules in the optical transmitter applied to the optical network unit, one module is used to transmit a wide-spectrum optical signal, and the wide-spectrum optical signal carries the registration information of the optical network unit. The other module is used to transmit laser information, and the laser signal carries the service data of the optical network unit. The wide-spectrum optical signal and the laser signal are in the same band. The frequency of the wide-spectrum optical signal is much lower than the frequency of the laser signal, which can prevent the wide-spectrum optical signal transmitted by the ONU from affecting the laser signals of other ONUs transmitting service data in the same band, and no windowing is required to complete the registration of the ONU.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of communication technology, and in particular to an optical transmitter, an optical network unit, and an optical transmission method. Background Art

[0002] With the rapid development of optical communication technology, passive optical network (PON) systems are increasingly being used in optical communication. A PON system consists of an optical line terminal (OLT) and multiple optical network units (ONUs), with the OLT communicating with the ONUs. Each ONU must register with the OLT when it comes online. During the ranging process during the ONU registration phase, the OLT obtains the logical distance between the ONU and the OLT. Based on this distance, the OLT allocates uplink time slots to the ONU, thus avoiding conflicts between uplink services of each ONU. In a PON system, when a new ONU user needs to register or come online, uplink windowing is currently used to prevent the registration information sent during the new user registration phase from impacting normally operating ONUs. Uplink windowing involves the OLT periodically blocking all normally operating ONUs from transmitting service data, creating an empty window in the uplink direction. During this window, only unregistered ONUs are allowed to send registration information (including messages used for ranging).

[0003] During the new ONU registration phase, registered ONUs cannot send service data. Therefore, windowing increases the latency for registered ONUs to send upstream service data. Summary of the Invention

[0004] The embodiments of the present application provide an optical transmitter, an optical network unit, and an optical transmission method to solve the problem of increased delay in sending service data by an ONU.

[0005] In a first aspect, an embodiment of the present application provides an optical transmitter, which is applied to an ONU. The optical transmitter may include a driver module, a first transmitter module, and a second transmitter module. The driver module is used to load an auxiliary management and control channel (AMCC) signal carrying the ONU's registration information onto the first transmitter module during the ONU registration process; then the first transmitter module is used to transmit an optical signal carrying the registration information according to the AMCC signal, wherein the optical signal transmitted by the first transmitter module is a wide-spectrum signal. After the ONU completes registration, the driver module is also used to load a data signal carrying the ONU's service data onto the second transmitter module; then the second transmitter module transmits a laser signal carrying the service data according to the data signal; wherein the optical signal carrying the ONU's registration information and the laser signal carrying the service data are located in the same wavelength band. It should be understood that being in the same wavelength band means being in the same wavelength range.

[0006] By installing this optical transmitter in the ONU, the OLT does not need to open a window on the service channel during the registration phase to complete the registration of new ONU users. Because the AMCC signal frequency is much lower than the data signal, the OLT only needs to detect whether a new ONU user has sent registration information on the AMCC channel. This optical transmitter system is low-cost. Furthermore, because the first transmission module transmits a wide-spectrum light signal instead of a laser signal, the signal carrying the registration information can be prevented from interfering with other normal service data signals.

[0007] In a possible design, the second transmitting module may be a laser, such as a semiconductor laser. For example, the semiconductor laser may be a distributed feedback laser or an electro-absorption modulated laser.

[0008] In a possible design, the first transmitting module may be a semiconductor optical amplifier, which can be used to transmit optical signals with a wide spectrum and has a low cost.

[0009] In a possible design, the first transmitting module and the second transmitting module may adopt a serial structure. After the ONU completes registration, the first transmitting module is used to receive the laser signal from the second transmitting module and amplify the laser signal.

[0010] In a possible design, the driving module is further used to drive the first transmitting module to be in an amplification mode after the ONU completes registration, so that the first transmitting module amplifies the laser signal from the second transmitting module.

[0011] In a possible design, the first transmitting module and the second transmitting module can be integrated into a light emitting device. The first transmitting module and the second transmitting module can also be deployed separately.

[0012] In a second aspect, embodiments of the present application further provide an ONU, comprising the optical transmitter described in the first aspect or any design of the first aspect. The ONU may also include a controller. The controller is configured to send an AMCC signal to a driver module during the ONU registration process, the AMCC signal carrying ONU registration information. The controller is further configured to send a data signal to the driver module after the ONU completes registration, the data signal carrying ONU service data.

[0013] In one possible design, the controller is also used to control the first transmitting module in the optical transmitter to be in the amplification mode after the ONU completes registration; or, to control the first transmitting module to be in the amplification mode through the driving module in the optical transmitter.

[0014] In a third aspect, an embodiment of the present application further provides an optical transmission method, comprising: in an ONU registration process, an optical transmission device applied to the ONU loads an AMCC signal carrying the ONU registration information onto a first transmission module, so that the first transmission module transmits an optical signal carrying the registration information, wherein the optical signal is a wide-spectrum signal;

[0015] After the ONU completes registration, the data signal carrying the service data is loaded onto the second transmitting module, causing the second transmitting module to emit a laser signal carrying the service data; wherein the optical signal carrying the registration information and the laser signal carrying the service data are in the same wavelength band. The optical transmitting device can be a controller in the ONU, a driver module in the ONU, or the ONU itself.

[0016] In a possible design, the above method may further include: after the OUN completes registration, the optical transmission device controls the first transmission module to be in an amplification mode, so that the first transmission module amplifies the laser signal carrying the service data.

[0017] In a fourth aspect, an embodiment of the present application provides a system, comprising an OLT and multiple ONUs as described in the second aspect or any design of the second aspect.

[0018] In addition, the technical effects brought about by any design method in the second to fourth aspects can refer to the technical effects brought about by different implementation methods in the first aspect, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the optical communication system architecture in an embodiment of the present application;

[0020] Figure 2 This is a schematic diagram of downlink transmission in an embodiment of the present application;

[0021] Figure 3 This is a schematic diagram of uplink transmission in an embodiment of the present application;

[0022] Figure 4 Schematic diagram of the optical communication system structure under the first possible mode in the embodiment of the present application;

[0023] Figure 5 Schematic diagram of the optical communication system structure under the second possible mode in the embodiment of the present application;

[0024] Figure 6 A possible structural diagram of an optical transmitter in an embodiment of the present application is shown;

[0025] Figure 7 Schematic diagram of the linear relationship between power and current of the SOA when separately configured in an embodiment of the present application;

[0026] Figure 8 Schematic diagram of the linear relationship between power and current of SOA when integrated in an embodiment of the present application;

[0027] Figure 9 Schematic diagram of the spectrum of SOA in an embodiment of the present application;

[0028] Figure 10 Schematic diagram of another possible structure of the optical transmitter in the embodiment of the present application;

[0029] Figure 11 This is a possible structural diagram of an ONU in an embodiment of the present application;

[0030] Figure 12 Schematic diagram of another possible structure of the ONU in the embodiment of the present application;

[0031] Figure 13 Schematic diagram of another possible structure of the ONU in the embodiment of the present application;

[0032] Figure 14 Schematic diagram of the light emission method in an embodiment of the present application. DETAILED DESCRIPTION

[0033] The embodiments of the present application can be applied to an optical communication system, and the optical communication system can be a PON system. The PON system can be a gigabit passive optical network (Gigabit-capable PON, GPON) system, an Ethernet passive optical network (EthernetPON, EPON) system, a 10Gb / s Ethernet passive optical network (10G-EPON) system, a time and wavelength division multiplexing passive optical network (time and wavelength division multiplexing passive optical network, TWDM-PON), a 10Gigabit passive optical network (10Gigabit-capable passive optical network, XG-PON) system or a 10Gigabit symmetric passive optical network (10-Gigabit-capable symmetric passive optical network, XGS-PON) system, etc. New technologies evolving in the future will increase the rate of PON to 25Gbps, 50Gbps or even 100Gbps, so the present application can also be applied to PON systems with higher transmission rates.

[0034] An optical communication system consists of at least an optical line terminal (OLT) and multiple optical network terminals (ONTs). The OLT communicates with each of the ONUs. The OLT and ONUs can be connected via optical passive components such as optical fibers and optical splitters, eliminating the need to rent a computer room or equip a power supply. Therefore, an optical communication system is a passive optical network. Figure 1 As shown, the OLT communicates with n ONUs through a splitter. Figure 1 In the example, the n ONUs are ONU1, ONU2, ..., ONUn. A splitter can also be called an optical splitter. A splitter is a fiber optic junction device with multiple inputs and outputs, used for coupling, branching, and distributing optical signals. The transmission path between the OLT and the splitter can be a feeder segment (i.e., the OLT and splitter are connected via a trunk optical fiber). The transmission path between the splitter and the ONU can be a drop segment (i.e., the splitter and ONU are connected via a branch optical fiber).

[0035] It should be understood that in the embodiments of the present application, the transmission direction of data or optical signals carrying data from the OLT to the ONU / ONT is referred to as the downstream direction. The transmission direction of data or optical signals carrying data from the ONU / ONT to the OLT is referred to as the upstream direction. The transmission of data or optical signals from the OLT to the ONU (downstream direction) may be broadcast, and the transmission of data or optical signals from the ONU to the OLT (upstream direction) may be unicast.

[0036] Data is transmitted between the OLT and the ONU using time division multiplexing technology, such as time division multiple access (TDMA).

[0037] For downlink transmission, see Figure 2 As shown in the figure, when the OLT sends data to the ONU, the signal sent by the OLT is divided into n paths after passing through the optical splitter and sent to n ONUs. The ONU selectively receives the downstream data with the same number as itself and discards the other data. Figure 3 As shown, each dynamic bandwidth allocation (DBA) period (uplink transmission time) is divided into a plurality of time slots Ti (i = 1, 2, 3, ... 32, ...), see Figure 2 As shown, only one ONU is assigned to send an uplink signal to the OLT in a packet manner in each time slot, and each ONU sends the signal in sequence according to the order specified by the OLT. It should be noted that an ONU can be assigned one or more time slots.

[0038] TDM requires the OLT to measure the distance between itself and each ONU and then implement strict transmission timing for each ONU. Each ONU obtains timing information from the downstream signal sent by the OLT and transmits upstream signals within the time slot specified by the OLT, thus avoiding conflicts between ONUs. PONs based on this principle are called TDM-PONs.

[0039] In a TDM-PON network, during upstream transmission, each ONU can only transmit optical signals during its own time slot and must shut down its transmitter at all other times. Otherwise, simultaneous optical signal transmissions from multiple ONUs will cause conflicts and interference, preventing the OLT from receiving data from any other ONUs, leading to service disruption across the entire PON network. When this happens, an ONU that transmits without being in its own time slot is called a rogue ONU. To ensure the proper operation of TDM-PON, the OLT strictly assigns each ONU its own time slot to prevent rogue ONUs from appearing.

[0040] During the ONU registration phase, the OLT obtains the logical distance between the ONU and the OLT during the ranging process, which is used to allocate uplink timeslots to the ONU. Current and next-generation PON systems employ low-latency services such as wireless bearer and virtual reality (VR) / augmented reality (AR). These low-latency services impose strict requirements on the PON system's latency. The significant latency introduced by uplink windowing in the PON system may make it unable to meet the requirements of these low-latency services.

[0041] To reduce the latency caused by uplink windowing, the first possible approach is to set up two transmitters (TX) in the ONU and use wavelength division multiplexing to transmit signals over a single optical fiber. The two transmitters use different wavelengths to transmit signals. Figure 4 As shown in FIG, a wavelength division multiplexer (WDM) combines two or more optical carrier signals of different wavelengths and couples them into the same optical fiber of an optical line for transmission. Figure 4 In the figure, there are two transmitters, transmitter 1 and transmitter 2. The wavelength corresponding to transmitter 1 is λu1, and the wavelength corresponding to transmitter 2 is λu2. One wavelength is used to send service data, and the other wavelength is used to send registration information (such as registration request or ranging information). When the OLT needs to open a window to allow a new ONU to go online, a window can be opened on one of the two upstream channels corresponding to the two wavelengths. For example, a window can be opened on the upstream channel corresponding to wavelength 1, and the other upstream channel (the upstream channel corresponding to λu2) can be used to send upstream service data normally. Two receivers are set in the OLT, one of which is receiver 1 (RX1) and receiver 2 (RX2). The wavelength corresponding to receiver 1 is λu1, and the wavelength corresponding to receiver 2 is λu2. During the windowing stage, receiver 1 is used to receive registration information, and receiver 2 is used to receive service data.

[0042] The second possible approach is to use a distributed feedback (DFB) laser on the ONU transmitter side. Figure 5As shown, the DFB laser includes a service module and a registration module. The service module is used to transmit service data but filters out low-frequency components of the service data (e.g., signals below 10 MHz). The registration module is used to transmit registration information, which is carried by a low-frequency signal (e.g., a signal with a rate less than 10 Mbps). The OLT periodically registers new ONUs. During the registration period, registered ONUs transmit upstream service data normally, while ONUs to be registered transmit registration information via the registration module. To prevent the registration information from affecting the service data transmitted by normal ONUs, the registration information rate must be much lower than the service data rate, and the optical power intensity of the registration information must be much lower than the signal power intensity of the service data.

[0043] The avalanche photodiode (ADP) in the OLT performs photoelectric conversion on the received uplink optical signal, splitting it into two electrical signals. One signal undergoes high-pass filtering, while the other undergoes low-pass filtering. The signals are then analyzed to obtain the ONU's registration information. The arrival time of the ONU signal is recorded to estimate the distance between the ONU and the OLT, completing the registration process for the new ONU. The high-pass filtered signal is amplified by a limiting amplifier and fed into the controller, which extracts service data from the amplified signal. This low-frequency, low-power approach avoids the increase in uplink service latency introduced by windowing.

[0044] The first possible approach requires two transmitters, increasing system costs. In the second possible approach, the ONU uses a DFB laser, which cannot stably emit signals with low optical power. DFB lasers have a lasing threshold when they start operating. Below the lasing threshold, the light emitted by the laser is very weak, and the signal strength does not meet the detection requirements of the receiver. Above the lasing threshold, the laser's optical power increases rapidly. When transmitting low-frequency registration information through the laser, it is difficult to control the power level to a level that does not affect the normal operation of other ONUs. Furthermore, when the DFB laser operates above the lasing threshold, it emits a single longitudinal mode laser, with all its power concentrated at a small wavelength. Because the service data signals transmitted by multiple ONUs in a PON system are within the same wavelength range, the simultaneous arrival of registration information and normal service data signals within the same wavelength range at the OLT receiver will produce a beat frequency effect. As a result, the optical power intensity of the registration information is very low, which will also affect the transmission of normal service data.

[0045] In order to reduce the cost of the system and reduce the impact of the signal carrying registration information on the signal carrying service data, the embodiment of the present application provides an ONU and a signal transmission method.

[0046] See also Figure 6 The figure shows a possible structural diagram of an optical transmitter. This optical transmitter is used in an ONU and includes a driver module, a first transmitter module, and a second transmitter module. The driver module is coupled to the first transmitter module and the second transmitter module, respectively. During the ONU registration process, the driver module is configured to load an AMCC signal carrying the ONU's registration information onto the first transmitter module. The first transmitter module transmits an optical signal carrying the registration information based on the AMCC signal. The optical signal is a broadband signal. After the ONU completes registration, the driver module is configured to load a data signal carrying the ONU's service data onto the second transmitter module. The second transmitter module is configured to transmit a laser signal carrying the service data based on the data signal. The optical signal carrying the registration information and the laser signal carrying the service data are in the same wavelength band. Specifically, the optical signal carrying the ONU registration information and the laser signal carrying the service data are in the same wavelength band, or in the same wavelength range. For example, the first transmitter module transmits the optical signal carrying the ONU registration information using wavelength λ, and the second transmitter module transmits the optical signal carrying the service data using wavelength λ. The optical signal transmitted by the first transmitter module is not a laser signal, but rather a broadband light signal. The power of the broadband light signal transmitted by the first transmitter module is significantly lower than the power of the laser signal transmitted by the second transmitter module. For example, the power of the laser signal transmitted by the second transmitter module is X times the power of the broadband light signal transmitted by the first transmitter module. For example, X is greater than or equal to 10, or X is greater than or equal to 5. The data rate of the broadband light signal transmitted by the first transmitter module is also significantly lower than the data rate of the laser signal transmitted by the second transmitter module. For example, the data rate of the broadband light signal transmitted by the first transmitter module is less than 10 Mbps, while the data rate of the laser signal transmitted by the second transmitter module is 2.5 Gbps, 10 Gbps, or 25 Gbps. For ease of description, the transmission channels for the low-frequency signal segment and the high-frequency signal segment are named separately: the transmission channel for the low-frequency signal segment is referred to as the AMCC channel, and the transmission channel for the high-frequency signal segment is referred to as the data channel. With the aforementioned optical transmitter installed in the ONU, during the registration phase, the OLT does not need to open windows on the service channel to complete the registration of new ONU users. Because the AMCC signal frequency is much lower than the data signal, the OLT only needs to detect whether a new ONU user has sent registration information through the AMCC channel. Compared to using two transmitters, this can reduce system costs. In addition, because the first transmitter module transmits light with a wide spectrum, it can prevent the signal carrying registration information from affecting other normal service data signals.

[0047] Exemplarily, the driving module may also be referred to as a driving circuit, for example, a semiconductor laser driver circuit (laser diode driver, LDD).

[0048] In one example, the first transmitting module and the second transmitting module are two discrete devices. For example, the first transmitting module is a laser. In another example, the first transmitting module and the second transmitting module can be integrated into one device, for example, the first transmitting module and the second transmitting module are integrated into a transmitting device.

[0049] Optionally, the second transmitting module can be a semiconductor laser (also referred to as a laser diode), such as a DFB laser or an electro-absorption modulated laser (EML). The first transmitting device can be a semiconductor optical amplifier (SOA). Unlike a laser, the emission power of an SOA is linearly related to the driving current, and the AMCC signal can be loaded by adjusting the driving current of the SOA. For example, see Figure 7 and Figure 8 The figure shows the linear relationship between the power of the optical signal sent by the SOA and the driving current. Figure 7 The figure shows the linear relationship between the power of the optical signal transmitted by the SOA and the driving current when the first transmitting module and the second transmitting module are two independent devices. The horizontal axis represents the driving current (or bias current) and the vertical axis represents the optical power. Figure 8 As shown, taking the second transmitting module as EML as an example, when SOA and EML are integrated together, the linear relationship between the power of the optical signal sent by SOA and the driving current is shown, the horizontal axis represents the driving current, and the vertical axis represents the optical power. Figure 7 and Figure 8 It can be seen that SOA can transmit optical signals with lower power. Figure 9 Shown is a schematic diagram of the spectral characteristics of SOA. Figure 9 The spectrum of SOA is 600mA, where the horizontal axis represents the wavelength and the vertical axis represents the power intensity. Figure 9 It can be seen that the optical signal emitted by the SOA has a wide spectrum.

[0050] In a possible implementation manner, when the first transmitting module and the second transmitting module are deployed in the optical transmitter, they may adopt a serial structure or a parallel structure. Figure 6 The following is a schematic diagram of the parallel structure. Figure 10 , which is a schematic diagram of the optical transmitter structure when the first transmitting module and the second transmitting module adopt a serial structure.

[0051] When the first and second transmitter modules are serially connected, the second transmitter module is inactive during the ONU registration phase. After ONU registration is complete, the ONU enters normal operation (i.e., the ONU begins transmitting service data), and the second transmitter module enters normal operation. When the second transmitter module enters normal operation, the first transmitter module can be in either amplification mode or transparent transmission mode. The driver module loads the data signal carrying the service data onto the second transmitter module, thereby transmitting a laser signal carrying the service data. In one example, the second transmitter module is in amplification mode and can transmit the laser signal carrying the service data to the first transmitter module. The first transmitter module can amplify the laser signal carrying the service data and then transmit it to the OLT. In another example, the second transmitter module is in transparent transmission mode and can transmit the laser signal carrying the service data to the first transmitter module. The first transmitter module can transparently transmit the laser signal carrying the service data or transmit the laser signal with some loss. It should be understood that whether amplifying the laser signal carrying the service data, transparently transmitting it, or transmitting it with some loss can meet the performance requirements of the communication system for the ONU transmitter.

[0052] See also Figure 11 and Figure 12 FIG. 1 is a schematic diagram of an ONU structure provided by an embodiment of the present application. The ONU includes the above-mentioned optical transmitter and a controller. Figure 11 In the embodiment, the first transmitting module and the second transmitting module of the optical transmitter of the ONU are deployed in a parallel structure. Figure 12 In the embodiment, the first transmitting module and the second transmitting module of the optical transmitter of the ONU are deployed in a serial structure.

[0053] The controller can send two signals, of which the first signal is used to send registration information during the ONU registration process. The second signal is used to send service data when service data needs to be sent after registration is completed. The registration information can be carried on the auxiliary management and control channel (AMCC) signal. Specifically, in the ONU registration process, the controller sends an AMCC signal to the driver module, and the AMCC signal carries the registration information. The driver module then loads the AMCC signal onto the first transmitting module, and the first transmitting module then transmits an optical signal carrying the registration information. After the ONU completes registration, when sending service data, the controller sends a data signal to the driver module, and the data signal carries the service data. The driver module then loads the data signal onto the second transmitting module; and the second transmitting module then transmits a laser signal carrying the service data.

[0054] Exemplarily, the controller may include one or more devices for implementing control functions, such as a media access control (MAC), a microcontroller unit (MCU), a digital signal processor (DSP), or a microprocessor unit (MPU).

[0055] When the first and second transmitter modules are configured in series, during the ONU registration phase, the second transmitter module is in an inactive state under the control of the controller. The controller sends an AMCC signal to the driver module via the AMCC channel, which drives the first transmitter module to transmit an optical signal carrying registration information. During the registration phase, the controller can control the second transmitter module to be inactive through the driver module, or the controller can directly control the second transmitter module to be inactive. After the ONU registration is complete, the ONU enters normal operation (i.e., the ONU begins transmitting service data), and the controller controls (or uses the driver circuit) the second transmitter module to enter normal operation. When the second transmitter module enters normal operation, the first transmitter module can be in amplification mode or transparent transmission mode. The controller sends a data signal carrying service data to the driver module. The driver module then loads the service data onto the second transmitter module based on the data signal; the second transmitter module then emits a laser signal carrying the service data. In one example, the second transmitter module is in amplification mode and can send the laser signal carrying the service data to the first transmitter module. The first transmitter module amplifies the laser signal carrying the service data and then transmits it to the OLT. In another example, the second transmitting module is in transparent transmission mode. The second transmitting module can send a laser signal carrying service data to the first transmitting module. The first transmitting module can transparently transmit the laser signal carrying service data, or transmit the laser signal with some loss. It should be understood that whether amplifying the laser signal carrying service data, transparently transmitting it, or transmitting it with some loss, can meet the performance requirements of the communication system for the ONU transmitter.

[0056] The following example takes the first transmitting module as SOA, the second transmitting module as DFB laser, and the controller as MAC as an example. Figure 13 The solution provided by the embodiment of the present application is described in detail. The SOA and the DFB laser are integrated together. For the convenience of description, the laser integrated with the SOA and the DFB laser is referred to as the SOA+DFB laser.

[0057] When an ONU needs to register and go online, the ONU's MAC sends an AMCC signal to the driver circuit. By controlling the driver circuit, it controls the SOA and loads the registration information in the AMCC signal onto the SOA. After the ONU completes registration, the ONU enters normal operating mode. To ensure the ONU can emit sufficient optical power, the DFB portion of the SOA+DFB laser begins operation. The ONU's MAC sends a normal data signal carrying service data, which is then loaded onto the DFB via the driver circuit. At this point, the SOA is also operating. The MAC can input a fixed current into the SOA via the driver circuit, causing the SOA to enter amplification mode and amplify the laser signal emitted after DFB modulating the service data. The DFB+SOA laser's transmission wavelength and spectrum are determined by the DFB; the SOA only performs amplification.

[0058] With the ONU provided in this application, during the registration phase, the OLT does not need to open a window on the service channel to complete the registration of new ONU users. Because the AMCC signal frequency is much lower than the data signal, the OLT only needs to detect whether a new ONU user has sent registration information through the AMCC channel. When the OLT detects a new user requiring registration on the AMCC channel, it collects the new ONU's registration information on the AMCC channel and completes the new ONU's registration through the normal downlink channel. After the ONU completes registration, the MAC controls the driver circuit, changing the operating mode of the DFB+SOA laser to normal operation mode.

[0059] Based on the same inventive concept as the above embodiment, the embodiment of the present application also provides a light transmission method, which can be performed by a light transmission device, and the light transmission device can be a controller in the ONU, or a driving module in the ONU, or can be an ONU.

[0060] See also Figure 14 As shown, the light emission method includes:

[0061] S1401, in the registration process of the optical network unit (ONU), the optical transmitting device loads the auxiliary management control channel (AMCC) signal carrying the registration information of the ONU onto the first transmitting module, so that the first transmitting module transmits an optical signal carrying the registration information, wherein the optical signal is a wide-spectrum signal.

[0062] S1402: After the ONU completes registration, the optical transmitting device loads a data signal carrying the service data of the ONU onto a second transmitting module, so that the second transmitting module transmits a laser signal carrying the service data.

[0063] The optical signal carrying the registration information and the laser signal carrying the service data are in the same wavelength band.

[0064] In one possible implementation, after the ONU completes registration, the optical transmission device controls the first transmission module to operate in an amplification mode, so that the first transmission module amplifies the laser signal carrying the service data. In this case, the optical transmission device may be a controller, and the controller controls the first transmission module to operate in an amplification mode, or the controller controls the first transmission module to operate in an amplification mode via a driver module.

[0065] When an ONU registers using the AMCC channel implementation method proposed in the embodiment of the present application, it does not affect the uplink data channels of other ONUs, and the OLT does not need to allow the registration and activation of new ONUs by opening windows on the data channels.

[0066] It should be understood that “one embodiment”, “one implementation”, “one implementation method” or “one example” mentioned throughout the specification means that the specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present application. Therefore, “in one embodiment”, “an implementation method”, “one implementation method” or “in an example” appearing throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. It should be understood that in the various embodiments of the present application, the size of the sequence numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0067] Additionally, the terms "system" and "network" are often used interchangeably herein. The term "and / or" herein simply describes an association relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " herein generally indicates that the associated objects are in an "or" relationship. It should be understood that in the embodiments of this application, "B corresponding to A" means that B is associated with A and that B can be determined based on A. However, it should also be understood that determining B based on A does not mean determining B solely based on A; B can also be determined based on A and / or other information. Furthermore, unless otherwise indicated, ordinal numbers such as "first" and "second" in the embodiments of this application are used to distinguish between multiple objects and are not intended to limit the order, timing, priority, or importance of multiple objects. Furthermore, the terms "including" and "having" in the embodiments of this application, the claims, and the accompanying drawings are not exclusive. For example, a process, method, system, product, or device that includes a series of steps or modules is not limited to the listed steps or modules and may also include steps or modules that are not listed.

[0068] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0069] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0070] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0071] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 The steps for the function specified in one or more boxes.

[0072] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present application without departing from the scope of the embodiments of the present application. Thus, if these modifications and variations of the embodiments of the present application fall within the scope of the claims of the present application and their equivalents, the present application also intends to include these modifications and variations.

Claims

1. An optical transmitter, characterized in that: Applicable to optical network units (ONUs), including: A driving module, a first transmitting module, and a second transmitting module; The driving module is configured to load an auxiliary management control channel AMCC signal carrying registration information of the ONU onto the first transmitting module during the registration process of the ONU; The first transmitting module is configured to transmit an optical signal carrying the registration information according to the AMCC signal, wherein the optical signal is a wide-spectrum signal; The driver module is further configured to load a data signal carrying the service data of the ONU onto the second transmitting module after the ONU completes registration; The second transmitting module is configured to transmit a laser signal loaded with the service data according to the data signal; The optical signal carrying the registration information and the laser signal carrying the service data are in the same wavelength band.

2. The optical transmitter according to claim 1, wherein The second emission module is a semiconductor laser.

3. The optical transmitter according to claim 2, wherein The semiconductor laser is a distributed feedback laser or an electro-absorption modulated laser.

4. The optical transmitter according to any one of claims 1 to 3, wherein: The first transmitting module is a semiconductor optical amplifier.

5. The optical transmitter according to any one of claims 1 to 3, wherein: The first transmitting module is further configured to receive the laser signal sent by the second transmitting module and amplify the laser signal.

6. The optical transmitter according to claim 5, wherein The driving module is further configured to drive the first transmitting module to be in an amplification mode.

7. The optical transmitter according to any one of claims 1 to 3, wherein: The first transmitting module and the second transmitting module are integrated into one light transmitting device.

8. An optical network unit (ONU), characterized in that: comprising the optical transmitter and controller according to any one of claims 1 to 7; The controller is configured to send the auxiliary management control channel AMCC signal to the driver module during the registration process of the ONU, where the AMCC signal carries the registration information of the ONU; The controller is further configured to send the data signal to the driver module after the ONU completes registration, where the data signal carries the service data.

9. The ONU according to claim 8, wherein The controller is further used to control the first transmitting module in the optical transmitter to be in the amplification mode after the ONU completes registration; or to control the first transmitting module in the amplification mode through the driving module in the optical transmitter.

10. A light emission method, characterized in that: include: In the registration process of the optical network unit (ONU), the optical transmitting device loads the auxiliary management control channel (AMCC) signal carrying the registration information of the ONU onto the first transmitting module, so that the first transmitting module transmits an optical signal carrying the registration information, wherein the optical signal is a wide-spectrum signal; After the ONU completes registration, the optical transmitting device loads the data signal carrying the service data of the ONU onto the second transmitting module, so that the second transmitting module transmits a laser signal carrying the service data; The optical signal carrying the registration information and the laser signal carrying the service data are in the same wavelength band.

11. The method according to claim 10, wherein Also includes: After the ONU completes registration, the optical transmitting device controls the first transmitting module to be in an amplification mode, so that the first transmitting module amplifies the laser signal carrying the service data.

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