Optical communication apparatus and optical network device

Abstract

An optical communication device and an optical network equipment are disclosed, belonging to the field of optical communication technology. The optical communication device includes a photoelectric conversion device, an amplification unit, and a processing unit. The photoelectric conversion device receives an uplink optical signal and converts it into a current signal. The uplink optical signal includes a time-division multiplexed first optical signal and a second optical signal. The data transmission rate of the first optical signal is less than that of the second optical signal, and the wavelength ranges of the first and second optical signals overlap. The amplification unit receives a rate indication signal indicating the data transmission rate of the uplink optical signal and converts the current signal into a voltage signal based on the data transmission rate indicated by the rate indication signal, outputting an amplified voltage signal. The processing unit obtains a data signal based on the amplified voltage signal. This enables the coexistence of ONUs with overlapping uplink wavelength ranges in a PON system.

Description

Technical Field

[0001] This application relates to the field of optical communication technology, and in particular to an optical communication device and an optical network equipment. Background Technology

[0002] Passive optical network (PON) is a point-to-multipoint fiber optic transmission and access technology. A PON system typically includes an optical line termination (OLT), an optical distributed network (ODN), and multiple optical network units (ONUs). The OLT connects to multiple ONUs through the ODN. The transmission direction from the OLT to the ONU is downlink, using time division multiplexing (TDM). The OLT broadcasts data to each ONU, and each ONU selects its own data to receive. The transmission direction from the ONU to the OLT is uplink, using time division multiple access (TDMA). Uplink data transmission is bursty, with different ONUs occupying different uplink time slots, and multiple ONUs sharing the uplink link through time division multiplexing.

[0003] With the development of optical communication technology, PON systems support increasingly higher data transmission rates. At certain times, a PON system may simultaneously contain at least two ONUs supporting different media access control (MAC) protocols. The uplink wavelength ranges used by ONUs supporting different MAC protocols may overlap, leading to uplink data conflicts and affecting the normal operation of the PON system. Summary of the Invention

[0004] This application provides an optical communication device and an optical network equipment that enables the coexistence of ONUs with overlapping uplink wavelength ranges in a PON system.

[0005] In a first aspect, this application provides an optical communication device. The optical communication device includes: a photoelectric conversion device, an amplification unit, and a processing unit. The photoelectric conversion device is used to receive an uplink optical signal and convert the uplink optical signal into a current signal. The uplink optical signal includes a time-division multiplexed first optical signal and a second optical signal, wherein the data transmission rate of the first optical signal is less than the data transmission rate of the second optical signal, and the wavelength ranges of the first optical signal and the second optical signal overlap. The amplification unit is used to receive a rate indication signal, which indicates the data transmission rate of the uplink optical signal; and to convert the current signal into a voltage signal according to the data transmission rate indicated by the rate indication signal, and output an amplified voltage signal. The processing unit is used to obtain a data signal based on the amplified voltage signal.

[0006] In this application, by transmitting the first and second optical signals with overlapping wavelength ranges in a time-division multiplexing manner, ONUs with overlapping uplink wavelength ranges can coexist in the PON system. Furthermore, since the first and second optical signals have different data transmission rates, the amplification unit processes the current signal output by the photoelectric conversion device according to the data transmission rate indicated by the rate indication signal, which facilitates flexible signal amplification and thus improves communication quality.

[0007] Optionally, the operating bandwidth of the amplification unit is positively correlated with the data transmission rate indicated by the rate indication signal. A higher data transmission rate results in a larger operating bandwidth for the amplification unit, and vice versa. The operating bandwidth of the amplification unit refers to the bandwidth of the amplifier within the amplification unit that processes the current signal output from the photoelectric conversion device. Using an appropriate operating bandwidth for the amplification unit helps improve the signal-to-noise ratio of the voltage signal output by the amplification unit, thereby improving communication quality.

[0008] Alternatively, the amplification unit can adopt either of the following two structures.

[0009] The first type of amplification unit includes a first burst-mode transimpedance amplifier (BM-TIA), a second BM-TIA, and a first switch. The first switch is used to connect the output terminal of the photoelectric conversion device to the input terminal of the first BM-TIA when a first rate indication signal is received; and to connect the output terminal of the photoelectric conversion device to the input terminal of the second BM-TIA when a second rate indication signal is received. The bandwidth of the first BM-TIA is less than the bandwidth of the second BM-TIA, and the data transmission rate indicated by the first rate indication signal is less than the data transmission rate indicated by the second rate indication signal.

[0010] In this first approach, when the data transmission rate is low, a first BM-TIA with a smaller bandwidth is used to process the current signal output by the photoelectric conversion device; while when the data transmission rate is high, a second BM-TIA with a larger bandwidth is used to process the current signal output by the photoelectric conversion device. This helps to ensure the signal-to-noise ratio of the amplified voltage signal obtained under different data transmission efficiencies, thereby improving communication quality.

[0011] Optionally, the first BM-TIA is a limiting TIA. For the current signal corresponding to the first optical signal with a low data transmission rate, using a limiting TIA can provide stable signal amplification, meet the needs of low-rate signal processing, and limit the amplitude of the output voltage, thereby providing overload protection for the circuit.

[0012] The second BM-TIA can be either a linear TIA or a clipped TIA. For current signals corresponding to second optical signals with high data transmission rates, a linear TIA ensures a good linear relationship between the input and output signals, reducing signal distortion. Furthermore, linear TIAs typically have a larger bandwidth, which is beneficial for meeting the processing requirements of second optical signals with high data transmission rates. If a clipped TIA can meet communication quality requirements, the second BM-TIA can also be a clipped TIA.

[0013] The second type includes a third BM-TIA. The input terminal of the third BM-TIA is connected to the output terminal of the photoelectric conversion device, and the output terminal of the third BM-TIA is connected to the processing unit. The bandwidth of the third BM-TIA is adjustable, and the bandwidth of the third BM-TIA varies according to the data transmission rate indicated by the rate indication signal.

[0014] For example, when the data transmission rate indicated by the rate indication signal is a first data transmission rate, the bandwidth of the third BM-TIA is the first bandwidth; when the data transmission rate indicated by the rate indication signal is a second data transmission rate, the bandwidth of the third BM-TIA is the second bandwidth. The first data transmission rate is less than the second data transmission rate, and the first bandwidth is less than the second bandwidth. That is, the higher the data transmission rate, the larger the bandwidth of the third BM-TIA; conversely, the lower the data transmission rate, the smaller the bandwidth of the third BM-TIA.

[0015] In this second approach, a bandwidth-adjustable transimpedance amplifier is used as the amplification unit. The amplification unit has a simple structure, which is beneficial to improving the integration of the optical communication device.

[0016] Optionally, the third BM-TIA is a limiting transimpedance amplifier or a linear transimpedance amplifier.

[0017] In the first implementation of the aforementioned amplification unit, the processing unit includes a first processing chip and a second processing chip. The first processing chip is connected to the output terminal of the first BM-TIA and is used to process the amplified voltage signal output by the first BM-TIA to obtain a first data signal. The second processing chip is connected to the output terminal of the second BM-TIA and is used to process the amplified voltage signal output by the second BM-TIA to obtain a second data signal.

[0018] Regarding the second implementation of the aforementioned amplification unit, the processing unit can be implemented in either of the following two ways.

[0019] The first type of processing unit includes a second switch, a third processing chip, and a fourth processing chip. The second switch is connected to the third processing chip, the fourth processing chip, and the amplification unit. The second switch is used to connect the output of the amplification unit to the third processing chip when a first rate indication signal is received; and to connect the output of the amplification unit to the fourth processing chip when a second rate indication signal is received, wherein the data transmission rate indicated by the first rate indication signal is less than the data transmission rate indicated by the second rate indication signal. The third processing chip processes the amplified voltage signal output by the amplification unit to obtain a first data signal; the fourth processing chip processes the amplified voltage signal output by the amplification unit to obtain a second data signal.

[0020] In this first approach, a second switch selects whether the amplified voltage signal output from the amplification unit is transmitted to a third or fourth processing chip. Existing mature chips can be used to process the voltage signal, making implementation relatively easy.

[0021] In the second embodiment, the processing unit includes a fifth processing chip, which includes a first output channel and a second output channel. The fifth processing chip is used to process the amplified voltage signal output by the amplification unit according to a first data transmission rate corresponding to the first rate selection signal when a first rate selection signal is received, and output a first data signal through the first output channel; and to process the amplified voltage signal output by the amplification unit according to a second data transmission rate corresponding to the second rate selection signal when a second rate selection signal is received, and output a second data signal through the second output channel, wherein the first data transmission rate is less than the first data transmission rate.

[0022] In this second approach, a processing chip processes the voltage signals corresponding to different data transmission rates, which helps to improve the integration of optical communication devices.

[0023] Optionally, the data transmission rate of the first optical signal is 1Gbps, and the data transmission rate of the second optical signal is 12.5Gbps, 25Gbps, or 50Gbps. The first optical signal can be transmitted by an ONU supporting the EPON protocol, and the second optical signal can be transmitted by an ONU supporting the 50GPON protocol.

[0024] Optionally, the uplink optical signal further includes a third optical signal, the third optical signal having a data transmission rate of 1Gbps or 10Gbps. This third optical signal can be transmitted by an ONU supporting the 10G EPON protocol. In this way, the optical communication device can receive optical signals transmitted by ONUs of three different generations, thereby enabling the coexistence of ONUs of three different generations in the PON system.

[0025] Optionally, the optical communication device is an optical module. In implementation, the amplification unit and the photoelectric conversion device can be packaged together to form an optical receiving component.

[0026] Secondly, this application provides an optical network device, such as an optical line terminal (OLT) or a main device in a fiber-to-the-room (FTTR) network. Optionally, the optical network device includes a single board and an optical module, wherein the optical module is connected to the single board, and the optical module includes any of the aforementioned optical communication devices. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of a PON system provided in an embodiment of this application;

[0028] Figure 2 This is a schematic diagram of the structure of an optical communication device provided in an embodiment of this application;

[0029] Figure 3 This is a schematic diagram of another optical communication device provided in an embodiment of this application;

[0030] Figure 4 This is a schematic diagram of another optical communication device provided in an embodiment of this application;

[0031] Figure 5 This is a schematic diagram of the structure of a transimpedance amplifier provided in an embodiment of this application;

[0032] Figure 6 This is a schematic diagram of the structure of another optical communication device provided in the embodiments of this application. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0034] Figure 1 This is a schematic diagram of the structure of a PON system provided in an embodiment of this application. Figure 1 As shown, a PON system includes an optical line termination (OLT) on the central office side, an optical network unit (ONU) or optical network termination (ONT) on the user side, and an optical distribution network (ODN).

[0035] OLT connects to upper-layer network-side devices (such as switches and routers), and lower-layer devices (such as ODNs). Figure 1 The diagram shows a connection to an ODN.

[0036] The function of the ODN is to distribute downlink data and centralize uplink data. The ODN has one uplink optical interface and several downlink optical interfaces. Optical signals received by the uplink optical interface are distributed to the outputs of all downlink optical interfaces, while optical signals received by the downlink optical interfaces are transmitted to the output of the single uplink optical interface. The ODN can aggregate uplink data from multiple ONUs and transmit it to the OLT, and it can also transmit downlink data from the OLT to each ONU. In a PON system, transmission from the OLT to the ONU is called downlink transmission, and vice versa is uplink transmission. Downlink transmission involves the OLT broadcasting downlink data to each ONU, while uplink transmission uses time-division multiplexing, with each ONU sending uplink data to the OLT according to the transmission time slots allocated by the OLT.

[0037] ODN generally includes passive optical splitters (also known as optical splitters), backbone optical fibers, and branch optical fibers. Figure 1 In this configuration, the ODN has a single-stage optical splitter structure. The fiber before the splitter (near the OLT side) is the backbone fiber, and the fiber after the splitter (near the ONU side) is the branch fiber. If the ODN has a two-stage optical splitter structure, it includes one first-stage splitter, multiple second-stage splitters, and backbone, distribution, and branch fibers. The fiber before the first-stage splitter is the backbone fiber, the fiber after the second-stage splitter is the branch fiber, and the fiber between the first-stage and second-stage splitters is the distribution fiber.

[0038] The ONU provides a user-side interface for the optical access network (OAN) and connects to the ODN. If the ONU also provides user port functionality, such as an Ethernet user port or a plain old telephone service (POTS) user port, it is called an optical network termination (ONT). It should be noted that, unless otherwise specified in the embodiments of this application, the ONU mentioned includes both ONU and ONT.

[0039] With the release of the 50-gigabit-capable passive optical network (50GPON) standard, 50G PON has become the only option for next-generation PONs after 10-gigabit-capable passive optical networks (10G PON) and 10-gigabit-capable ethernetpassive optical networks (10G EPON). 10G PON can include both 10-gigabit-capable passive optical networks (XG-PON) and 10-gigabit-capable symmetric passive optical networks (XGSPON).

[0040] To achieve a smooth upgrade of PON systems, ONUs supporting the 50G PON protocol need to coexist with existing generations of ONUs for a period of time. For example, Figure 1 In this PON system, three types of ONUs—one supporting 50G PON, one supporting EPON, and one supporting 10G EPON—coexist. In other embodiments, it is also possible for two types of ONUs—one supporting 50G PON and one supporting EPON—to coexist.

[0041] However, the wavelength division coexistence option specified in the 50G PON standard sets the uplink wavelength of 50G PON to 1286±2nm, which overlaps with the uplink wavelength of 1310±50nm of some ONUs in the existing Ethernet passive optical network (EPON), making wavelength division coexistence impossible.

[0042] To this end, this application provides an optical communication device that time-division multiplexes a first optical signal and a second optical signal whose wavelength ranges overlap, then performs photoelectric conversion on the first optical signal and the second optical signal through a photoelectric conversion device, and then processes the current signal output by the photoelectric conversion device according to different data transmission rates through an amplification unit, thereby enabling ONUs supporting different protocols to coexist in a PON system.

[0043] Figure 2 This is a schematic diagram of the structure of an optical communication device provided in an embodiment of this application. This optical communication device can be... Figure 1 It is part of the OLT, for example, it can be implemented as part or all of the optical modules in the OLT. For example... Figure 2 As shown, the optical communication device includes: a photoelectric conversion device 201, an amplification unit 202, and a processing unit 203. The input terminal of the amplification unit 202 is electrically connected to the output terminal of the photoelectric conversion device 201, and the output terminal of the amplification unit 202 is electrically connected to the processing unit 203.

[0044] The photoelectric conversion device 201 receives an uplink optical signal and converts it into a current signal. The uplink optical signal includes a time-division multiplexed first optical signal and a second optical signal. That is, the first and second optical signals arrive at the photoelectric conversion device 201 at different times. The data transmission rate of the first optical signal is less than that of the second optical signal, and the wavelength ranges of the first and second optical signals overlap. The amplification unit 202 receives a rate indication signal, converts the current signal output by the photoelectric conversion device 201 into a voltage signal according to the data transmission rate indicated by the rate indication signal, and outputs an amplified voltage signal. The processing unit 203 obtains a data signal based on the amplified voltage signal output by the amplification unit 202.

[0045] In this embodiment, by transmitting the first and second optical signals with overlapping wavelength ranges in a time-division multiplexing manner, ONUs with overlapping uplink wavelength ranges can coexist in the PON system. Furthermore, since the data transmission rates of the first and second optical signals are different, the amplification unit processes the current signal output by the photoelectric conversion device according to the data transmission rate indicated by the rate indication signal, which facilitates flexible signal amplification and thus improves communication quality.

[0046] Optionally, the data transmission rate of the first optical signal can be 1Gbps or 10Gbps, and the data transmission rate of the second optical signal can be 12.5Gbps, 25Gbps or 50Gbps.

[0047] In practice, the first optical signal can be transmitted by a first type of ONU. This first type of ONU can be an ONU that supports the EPON protocol and uses a Fabry-Perot (FP) laser. Accordingly, the wavelength range of the first optical signal is 1260nm-1360nm, and the data transmission rate of the first optical signal is 1Gbps.

[0048] The second optical signal can be transmitted by a type-two ONU. This type-two ONU supports the 50G PON protocol, the wavelength range of the second optical signal is 1284nm-1288nm, and the data transmission rate of the second optical signal is 12.5Gbps, 25Gbps, or 50Gbps. In other embodiments, the type-two ONU can support the 25G PON protocol. When the type-two ONU supports the 25G PON protocol, the wavelength range of the second optical signal is 1290nm-1310nm or 1260nm-1280nm, and the data transmission rate of the second optical signal is 12.5Gbps or 25Gbps.

[0049] In this case, the wavelength range of the first optical signal includes the wavelength range of the second optical signal, and the wavelength range of the second optical signal is a proper subset of the wavelength range of the first optical signal.

[0050] Optionally, the uplink optical signal also includes a third optical signal transmitted by a third type of ONU. This third type of ONU can be an ONU supporting the 10G EPON protocol and employing a distributed feedback (DFB) laser. Correspondingly, the wavelength range of the third optical signal is 1260nm-1360nm or 1290nm-1330nm, and the data transmission rate of the third optical signal is 1Gbps or 10Gbps. This third optical signal is time-division multiplexed with the aforementioned first and second optical signals. In this case, the optical communication device can receive optical signals transmitted by ONUs from three different generations, thereby enabling the coexistence of ONUs from three different generations in the PON system.

[0051] For example, the photoelectric conversion device 201 may be an avalanche photoelectric diode (APD), a positive-intrinsic-negative (PIN) diode, or a photomultiplier tube, etc.

[0052] The operating bandwidth of amplification unit 202 is positively correlated with the data transmission rate indicated by the rate indication signal. A higher data transmission rate results in a larger operating bandwidth for amplification unit 202, and a lower data transmission rate results in a smaller operating bandwidth. Specifically, the operating bandwidth of amplification unit 202 refers to the bandwidth of the amplifier within amplification unit 202 that processes the current signal output from the photoelectric conversion device 201. Using an appropriate operating bandwidth for the amplification unit helps improve the signal-to-noise ratio of the voltage signal output by the amplification unit, thereby improving communication quality. This rate indication signal can be generated by the control system in the OLT where the optical communication device is located, such as a media access control (MAC) chip.

[0053] The processing unit 203 includes an optical digital signal processor (oDSP) or a physical layer (PHY) chip, etc., and is used to recover the data signal based on the amplified voltage signal. In this embodiment, the data signals are all digital electrical signals. The processing unit 203 is used to further amplify the signal output by the amplification unit 202 and recover the data to obtain the data signal.

[0054] In practice, the amplification unit 202 and the photoelectric conversion device 201 can be packaged together, and the packaging form includes, but is not limited to, transistor outline (TO) packaging or box packaging. The amplification unit 202 and the photoelectric conversion device 201 packaged together can be referred to as a receiver optical subassembly (ROSA).

[0055] Optionally, the optical communication device may also include a transmitter optical subassembly (TOSA) for transmitting downlink optical signals.

[0056] Figure 3 This is a schematic diagram of another optical communication device provided in an embodiment of this application. This optical communication device can be... Figure 1 It is part of the OLT, for example, it can be implemented as part or all of the optical modules in the OLT. For example... Figure 3 As shown, the optical communication device includes a photoelectric conversion device 301, an amplification unit 302, and a processing unit 303. The input terminal of the amplification unit 302 is electrically connected to the output terminal of the photoelectric conversion device 301, and the output terminal of the amplification unit 302 is electrically connected to the processing unit 303.

[0057] The photoelectric conversion device 301 is used to receive uplink optical signals and convert them into current signals. For more information on the photoelectric conversion device 301 and uplink optical signals, please refer to [link to relevant documentation]. Figure 2 The illustrated embodiment is omitted in detail here. The amplification unit 302 receives a rate indication signal, converts the current signal output by the photoelectric conversion device 301 into a voltage signal according to the data transmission rate indicated by the rate indication signal, and outputs an amplified voltage signal. The processing unit 303 obtains a data signal based on the amplified voltage signal output by the amplification unit 302.

[0058] Amplification unit 302 includes a first BM-TIA 3021, a second BM-TIA 3022, and a first switch 3023. The first switch 3023 is connected to the output terminal of the photoelectric conversion device 301, the input terminal of the first BM-TIA 3021, and the input terminal of the second BM-TIA 3022, respectively. The first switch 3023 is used to connect the output terminal of the photoelectric conversion device 301 to the input terminal of the first BM-TIA 3021 when a first rate indication signal is received, at which time the operating bandwidth of amplification unit 302 is the bandwidth of the first BM-TIA 3021; ​​and to connect the output terminal of the photoelectric conversion device 301 to the input terminal of the second BM-TIA 3022 when a second rate indication signal is received, at which time the operating bandwidth of amplification unit 302 is the bandwidth of the second BM-TIA 3022. The bandwidth of the first BM-TIA 3021 is less than the bandwidth of the second BM-TIA 3022. The data transmission rate indicated by the first rate indication signal is less than the data transmission rate indicated by the second rate indication signal.

[0059] For example, the control terminal of the first switch 3023 is used to receive a rate indication signal. The input terminal of the first switch 3023 is connected to the output terminal of the photoelectric conversion device 301. The first output terminal of the first switch 3023 is connected to the first BM-TIA 3021, and the second output terminal of the first switch 3023 is connected to the second BM-TIA 3022. When the rate indication signal received by the control terminal of the first switch 3023 is a first rate indication signal, the input terminal and the first output terminal of the first switch 3023 are connected. When the rate indication signal received by the control terminal of the first switch 3023 is a second rate indication signal, the input terminal and the second output terminal of the first switch 3023 are connected.

[0060] In implementation, the rate indication signal can be a level signal. For example, the first rate indication signal is a high-level signal and the second rate indication signal is a low-level signal; or, the first rate indication signal is a low-level signal and the second rate indication signal is a high-level signal.

[0061] For example, the first rate indication signal indicates a data transmission rate of 1Gbps or 10Gbps, and the second rate indication signal indicates a data transmission rate of 12.5Gbps, 25Gbps, or 50Gbps.

[0062] In this embodiment, the bandwidth of the TIA refers to the frequency range that the TIA can effectively amplify, which can be expressed as a 3dB bandwidth, i.e., the frequency at which the gain drops to -3dB of the maximum gain. The bandwidth directly determines the highest frequency of the signal that the TIA can process, thus affecting the signal transmission rate. If the bandwidth is insufficient, high-frequency signal components will be filtered out, leading to signal distortion. Furthermore, insufficient bandwidth will also limit the signal transmission rate, resulting in a slower data transmission rate. Conversely, if the bandwidth is too large, it is easy to introduce noise for signals with low data transmission rates, reducing the signal-to-noise ratio. Therefore, a TIA with appropriate bandwidth is needed to process signals with different data transmission rates.

[0063] High-speed signals require higher bandwidth to ensure signal integrity and low distortion. For example, when the data transmission rate is 50Gbps, the bandwidth of the second BM-TIA is above 20GHz (e.g., between 20GHz and 40GHz); or, for example, when the data transmission rate is 25Gbps, the bandwidth of the second BM-TIA is 14GHz-21GHz to ensure fast signal response and low distortion. Low-speed signals have relatively lower bandwidth requirements, but still need sufficient bandwidth to avoid signal distortion. For example, when the data transmission rate is 10Gbps, the bandwidth of the first BM-TIA can be 7GHz-10GHz.

[0064] In this embodiment, when the data transmission rate is low, a first BM-TIA with a smaller bandwidth is used to process the current signal output by the photoelectric conversion device; while when the data transmission rate is high, a second BM-TIA with a larger bandwidth is used to process the current signal output by the photoelectric conversion device. This helps to ensure the signal-to-noise ratio of the amplified voltage signal obtained under different data transmission efficiencies, thereby improving communication quality. Furthermore, the first BM-TIA can use existing mature devices, making its implementation relatively simple.

[0065] Optionally, the first BM-TIA 3021 is a limiting TIA. For the current signal corresponding to the first optical signal with a low data transmission rate, the limiting TIA can provide stable signal amplification, meet the needs of low-rate signal processing, and limit the amplitude of the output voltage, thereby providing overload protection for the circuit.

[0066] Optionally, the second BM-TIA 3022 can be either a linear TIA or a limiting TIA. For current signals corresponding to second optical signals with high data transmission rates, a linear TIA ensures a good linear relationship between the input and output signals, reducing signal distortion. Furthermore, linear TIAs typically have a larger bandwidth, which is beneficial for meeting the processing requirements of second optical signals with high data transmission rates. If a limiting TIA can meet communication quality requirements, the second BM-TIA can also be a limiting TIA.

[0067] In this embodiment, the processing unit 303 includes a first processing chip 3031 and a second processing chip 3032. The first processing chip 3031 is connected to the output terminal of the first BM-TIA 3021 and is used to process the amplified voltage signal output by the first BM-TIA 3021 to obtain a first data signal. The second processing chip 3032 is connected to the output terminal of the second BM-TIA 3022 and is used to process the amplified voltage signal output by the second BM-TIA 3022 to obtain a second data signal.

[0068] Optionally, the first processing chip 3031 may include independent first and second sub-chips. The first sub-chip is used to process the electrical signal corresponding to the first optical signal transmitted by a first type of ONU, and the second sub-chip is used to process the electrical signal corresponding to the third optical signal transmitted by a third type of ONU. In this case, the first sub-chip may be a PHY chip supporting the EPON protocol, and the second sub-chip may be a PHY chip supporting the 10G EPON protocol.

[0069] Alternatively, in other embodiments, the first processing chip 3031 may also be a processing chip that integrates the functions of the first sub-chip and the second sub-chip.

[0070] As mentioned above, the second BM-TIA 3022 is used to process the electrical signal corresponding to the second optical signal. The second optical signal is sent by a Type II ONU that supports the 50GPON protocol. Therefore, the second processing chip 3032 can be a PHY chip or an oDSP that supports the 50GPON protocol.

[0071] The second processing chip 3032 has a control channel for receiving a rate selection signal. When the second optical signal is transmitted by the aforementioned second type ONU, the rate selection signal can indicate a rate of 12.5Gbps, 25Gbps, or 50Gbps. The second processing chip 3032 is used to process the amplified voltage signal output by the amplification unit according to the received rate selection signal.

[0072] In one possible implementation, the rate selection signal can be an electrical signal. When the rate selection signal is high, the indicated rate is 12.5Gbps; when the rate selection signal is low, the indicated rate is 25Gbps or 50Gbps. The second processing chip 3032 adaptively switches the electrical signals corresponding to 25Gbps and 50Gbps.

[0073] like Figure 4 As shown, the optical communication device further includes an optical transmission component for transmitting downlink optical signals. The optical transmission component includes a first transmitter 3041, a second transmitter 3042, and a third transmitter 3043. The first transmitter 3041 is used to transmit a first downlink optical signal, the second transmitter 3042 is used to transmit a second downlink optical signal, and the third transmitter 3043 is used to transmit a third downlink optical signal.

[0074] For example, Figure 4 In the above, the first downlink optical signal is an optical signal sent to the first type of ONU, with a wavelength range of 1480nm-1500nm; the second downlink optical signal is an optical signal sent to the second type of ONU, with a wavelength range of 1575nm-1580nm; and the third downlink optical signal is an optical signal sent to the third type of ONU, with a wavelength range of 1364nm-1368nm.

[0075] The first transmitter 3041, the second transmitter 3042, and the third transmitter 3043 are also connected to the aforementioned processing unit 303, which is also used to drive the first transmitter 3041, the second transmitter 3042, and the third transmitter 3043 to emit light.

[0076] Optionally, the optical communication device further includes a wavelength division multiplexing device 305, which is used to transmit uplink optical signals in the optical fiber to the optoelectronic conversion device and to transmit downlink optical signals transmitted by the optical transmission component to the optical fiber, so that the uplink optical signal and the downlink optical signal can be transmitted in a single optical fiber.

[0077] Figure 4 This is a schematic diagram of another optical communication device provided in an embodiment of this application. This optical communication device can be... Figure 1 It is part of the OLT, for example, it can be implemented as part or all of the optical modules in the OLT. Figure 3 The difference in the illustrated embodiment is that the amplification unit 402 and the processing unit 403 have different structures.

[0078] like Figure 4As shown, the amplification unit 402 includes a third BM-TIA. The input terminal of the third BM-TIA is connected to the output terminal of the photoelectric conversion device 301, and the output terminal of the third BM-TIA is connected to the processing unit 403. The bandwidth of the third BM-TIA is adjustable, and the bandwidth of the third BM-TIA varies according to the data transmission rate indicated by the rate indication signal.

[0079] For example, when the rate indication signal is a first rate indication signal, the bandwidth of the third BM-TIA is the first bandwidth; when the rate indication signal is a second rate indication signal, the bandwidth of the third BM-TIA is the second bandwidth. The data transmission rate indicated by the first rate indication signal is less than the data transmission rate indicated by the second rate indication signal, and the first bandwidth is less than the second bandwidth. That is, the higher the data transmission rate, the larger the bandwidth of the third BM-TIA; conversely, the lower the data transmission rate, the smaller the bandwidth of the third BM-TIA.

[0080] In this second approach, a bandwidth-adjustable BM-TIA is used as the amplification unit. The amplification unit has a simple structure, which is beneficial to improving the integration of the optical communication device.

[0081] Figure 5 This is a schematic diagram of a bandwidth-adjustable BM-TIA. (Example) Figure 5 As shown, the BM-TIA includes a transimpedance amplifier 501, a feedback resistor R, a single-ended to differential converter (S2D) amplifier 502, a buffer 503, and a filter circuit 504. The two ends of the feedback resistor R are connected to the input and output terminals of the transimpedance amplifier 501, respectively. The input terminal of the transimpedance amplifier 501 is connected to the output terminal of the photoelectric conversion device, and the output terminal of the transimpedance amplifier 501 is connected to the input terminal of the S2D amplifier 502. The two output terminals of the S2D amplifier 502 are connected to the two input terminals of the buffer 503.

[0082] The transimpedance amplifier 501 converts the current signal into a voltage signal, and the value of the feedback resistor R is the gain of the transimpedance amplifier 501. Optionally, the feedback resistor R can be an adjustable resistor, so the gain of the BM-TIA can be adjusted by adjusting the value of the feedback resistor R. The S2D amplifier 502 converts the single-ended signal into a double-ended signal and outputs it to the buffer 503. The buffer 503 can perform impedance matching and linear amplification of the signal, thereby ensuring the performance and signal integrity of the entire amplification unit. The filter circuit 504 adjusts the bandwidth of the BM-TIA according to the rate indication signal.

[0083] This application embodiment does not limit the structure of the filter circuit 504, and it can be configured as needed. For example, the filter circuit 504 may include multiple parallel filter sub-circuits, at least one of which includes a capacitor and a switch connected in series. One end of each filter sub-circuit is connected to the output terminal of the transimpedance amplifier 501, and the other end is connected to the control terminal of the S2D 502. For example, Figure 5 In this circuit, filter circuit 504 includes three filter sub-circuits, each containing a capacitor and a switch connected in series. The capacitance values ​​of the capacitors in the different filter sub-circuits can all be the same, all be different, or some can be the same. Each switch has a control terminal for receiving a rate indication signal.

[0084] In one possible implementation, the filter sub-circuits in filter circuit 504 are divided into two parts. The switches in the first part of the filter sub-circuit are high-level (on), and the switches in the second part of the filter sub-circuit are low-level (on). When the rate indication signal is high-level, the capacitor in the first part of the filter sub-circuit is connected to the circuit; when the rate indication signal is low-level, the capacitor in the second part of the filter sub-circuit is connected to the circuit. In this way, the capacitance value of the capacitor connected to the circuit can be controlled by the rate indication signal, thereby controlling the bandwidth of the TIA.

[0085] Optionally, the filter circuit 504 may further include a reset switch connected to each filter sub-circuit. This reset circuit is used to reset each capacitor in the filter circuit 504 to ensure that the circuit can respond quickly when the next burst signal arrives.

[0086] For example, the reset switch includes a control terminal, a first terminal, and a second terminal. The control terminal of the reset switch is used to receive a reset signal. The first terminal of the reset switch is connected to the end of the filter sub-circuit connected to the S2D 502, and the second terminal of the reset switch is grounded. When the control terminal receives a reset signal, the first terminal and the second terminal of the reset switch are connected, thereby achieving a reset.

[0087] It needs to be explained that, Figure 5 The BM-TIA structure shown is for illustrative purposes only; any BM-TIA with adjustable bandwidth can be used.

[0088] See you again Figure 4The processing unit 403 includes a second switch 4033, a third processing chip 4031, and a fourth processing chip 4032. The second switch 4033 is connected to the third processing chip 4031, the fourth processing chip 4032, and the amplification unit 402, respectively. The second switch 4033 is used to connect the output terminal of the amplification unit 402 to the third processing chip 4031 when a first rate indication signal is received; and to connect the output terminal of the amplification unit 402 to the fourth processing chip 4032 when a second rate indication signal is received. The data transmission rate indicated by the first rate indication signal is less than the data transmission rate indicated by the second rate indication signal. The third processing chip 4031 processes the amplified voltage signal output by the amplification unit 402 to obtain a first data signal. The fourth processing chip 4032 processes the amplified voltage signal output by the amplification unit 402 to obtain a second data signal.

[0089] For example, the control terminal of the second switch 4033 is used to receive a rate indication signal, the input terminal of the second switch 4033 is connected to the output terminal of the amplification unit 402, the first output terminal of the second switch 4033 is connected to the third processing chip 4031, and the second output terminal of the second switch 4033 is connected to the fourth processing chip 4032. The second switch 4033 is used to connect the input terminal of the second switch 4033 and the first output terminal of the second switch 4032 when receiving the first rate indication signal, and to connect the input terminal of the second switch and the second output terminal of the second switch 4032 when receiving the second rate indication signal.

[0090] Optionally, the implementation of the third processing chip 4031 can refer to the aforementioned first processing chip 3031, and the implementation of the fourth processing chip 4032 can refer to the aforementioned second processing chip 3032, which will not be described in detail here.

[0091] Figure 6 This is a schematic diagram of another optical communication device provided in an embodiment of this application. This optical communication device can be... Figure 1 It is part of the OLT, for example, it can be implemented as part or all of the optical modules in the OLT. Figure 4 The difference in the illustrated embodiment is that the structure of the processing unit 603 is different.

[0092] like Figure 6As shown, the processing unit 603 includes a fifth processing chip 6031. The fifth processing chip 6031 is configured to, when receiving a first rate selection signal, process the amplified voltage signal output by the amplification unit according to a first data transmission rate corresponding to the first rate selection signal, and output a first data signal through a first output channel; and when receiving a second rate selection signal, process the amplified voltage signal output by the amplification unit according to a second data transmission rate corresponding to the second rate selection signal, and output a second data signal through a second output channel.

[0093] Optionally, the fifth processing chip 6031 has a control channel for receiving the first rate selection signal or the second rate selection signal.

[0094] When the first optical signal is transmitted by the aforementioned first type of ONU, the data transmission rate corresponding to the first rate selection signal is 1Gbps. When the second optical signal is transmitted by the aforementioned second type of ONU, the data transmission rate corresponding to the second rate selection signal is 12.5Gbps, 25Gbps, or 50Gbps. When the uplink optical signal also includes a third optical signal transmitted by the aforementioned third type of ONU, the data transmission rate corresponding to the first rate selection signal is 1Gbps or 10Gbps.

[0095] In this embodiment, the fifth processing chip 6031 needs to process signals at multiple rates; therefore, the corresponding rate selection signal can be a combination of level signals. For example, the fifth processing chip 6031 has two control channels, each used to receive a level signal. When both control channels receive high-level signals, the rate selection signal corresponds to a first rate; when both control channels receive low-level signals, the rate selection signal corresponds to a second rate; when the two control channels receive high-level and low-level signals sequentially, the rate selection signal corresponds to a third rate; and when the two control channels receive low-level and high-level signals sequentially, the rate selection signal corresponds to a fourth rate. For example, the first rate is 1Gbps, the second rate is 10Gbps and 12.5Gbps, the third rate is 25Gbps, and the fourth rate is 50Gbps. The rate values ​​corresponding to the first to fourth rates can be adjusted as needed.

[0096] Optionally, the fifth processing chip 6031 can be a PHY chip or an oDSP.

[0097] Optionally, the processing unit 603 further includes a first driving chip 6032 and a second driving chip 6033. The first driving chip 6032 is used to drive the first transmitter 3041 to emit light, the second driving chip 6033 is used to drive the second transmitter 3042 to emit light, and the fifth processing chip 6031 is also used to drive the third transmitter 3043 to emit light.

[0098] This application also provides an optical network device. This optical network device can be an OLT or a master device (also known as a main gateway, etc.) in a fiber-to-the-room (FTTR) network. The optical network device includes a single board and an optical module, with the optical module connected to the single board. The optical module includes the aforementioned optical communication device.

[0099] For example, a MAC chip is provided on the single board. The MAC chip is electrically connected to the optical module.

[0100] The MAC chip is used to allocate uplink time slots to each ONU according to the time slot scheduling mechanism, and outputs a corresponding rate indication signal based on the allocated uplink time slot. For example, when the first time slot is an uplink time slot allocated to a first type of ONU, the data transmission rate indicated by the rate indication signal output by the MAC chip in the first time slot is the data transmission rate of the first optical signal. Furthermore, the MAC chip pre-collects and stores the data transmission rates of the signals transmitted by each ONU in the PON system; therefore, the MAC chip can output a rate selection signal to the optical communication device based on the data transmission rate of the ONU corresponding to the uplink time slot.

[0101] In this embodiment, the first time slot scheduling mechanism is used to group time slots into a first time slot group and a second time slot group. The time slots of the first time slot group are used to schedule first-type ONUs, enabling them to transmit a first optical signal within the time slots of the first time slot group. The time slots of the second time slot group are used to schedule second-type ONUs, enabling them to transmit a second optical signal within the time slots of the second time slot group.

[0102] The first time slot scheduling mechanism ensures that the first and second time slot groups do not overlap in the time dimension. For Type I and Type II ONUs with overlapping uplink wavelengths, the first time slot scheduling mechanism can stagger the time dimension of the first optical signal transmitted by the Type I ONU and the second optical signal transmitted by the Type II ONU, preventing them from interfering with each other. This avoids uplink data conflicts between the Type I and Type II ONUs, allowing the PON system to function normally.

[0103] When there is a third type of ONU in the PON system, the time slots can be grouped to obtain a third time slot group. The third time slot group is used to schedule the third type of ONU, so that the third type of ONU can send the third optical signal in the time slot of the third time slot group.

[0104] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this application pertains. The terms “first,” “second,” “third,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an” or “a” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “comprising” or “including” and similar terms mean that the elements or objects preceding “comprising” or “including” encompass the elements or objects listed following “comprising” or “including” and their equivalents, and do not exclude other elements or objects. The “multiple” mentioned in the embodiments of this application refers to two or more. A and / or B indicate three possibilities: A; B; and A and B.

[0105] The above is merely one embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An optical communication device, characterized by, The optical communication device includes a photoelectric conversion device, an amplification unit, and a processing unit. The photoelectric conversion device is used to receive uplink optical signals and convert the uplink optical signals into current signals. The uplink optical signals include time-division multiplexed first optical signals and second optical signals. The data transmission rate of the first optical signal is less than the data transmission rate of the second optical signal, and the wavelength ranges of the first optical signal and the second optical signal overlap. The amplification unit is used to receive a rate indication signal, which indicates the data transmission rate of the uplink optical signal; and to convert the current signal into a voltage signal according to the data transmission rate indicated by the rate indication signal, and output an amplified voltage signal. The processing unit is used to obtain a data signal based on the amplified voltage signal.

2. The optical communication device of claim 1, wherein, The amplification unit includes a first burst-mode transimpedance amplifier, a second burst-mode transimpedance amplifier, and a first switch. The first switch is connected to the output terminal of the photoelectric conversion device, the input terminal of the first burst-mode transimpedance amplifier, and the input terminal of the second burst-mode transimpedance amplifier, respectively. The first switch is used to connect the output terminal of the photoelectric conversion device to the input terminal of the first burst mode transimpedance amplifier when a first rate indication signal is received; And upon receiving the second rate indication signal, the output terminal of the photoelectric conversion device is connected to the input terminal of the second burst mode transimpedance amplifier; Wherein, the bandwidth of the first burst mode transimpedance amplifier is less than the bandwidth of the second burst mode transimpedance amplifier, and the data transmission rate indicated by the first rate indication signal is less than the data transmission rate indicated by the second rate indication signal.

3. The optical communication device of claim 2, wherein, The first burst-mode transimpedance amplifier is a limited transimpedance amplifier, and the second burst-mode transimpedance amplifier is a linear transimpedance amplifier or a limited transimpedance amplifier.

4. The optical communication device of claim 1, wherein, The amplification unit includes a third burst-mode transimpedance amplifier. The input terminal of the third burst mode transimpedance amplifier is connected to the output terminal of the photoelectric conversion device, and the output terminal of the third burst mode transimpedance amplifier is connected to the processing unit. The bandwidth of the third burst mode transimpedance amplifier is adjustable, and the bandwidth of the third burst mode transimpedance amplifier varies according to the data transmission rate indicated by the rate indication signal.

5. The optical communication device of claim 4, wherein, The third burst mode transimpedance amplifier is either a limited transimpedance amplifier or a linear transimpedance amplifier.

6. The optical communication device of claim 2 or 3, wherein, The processing unit includes a first processing chip and a second processing chip. The first processing chip is connected to the output terminal of the first burst mode transimpedance amplifier and is used to process the amplified voltage signal output by the first burst mode transimpedance amplifier to obtain the first data signal. The second processing chip is connected to the output terminal of the second burst mode transimpedance amplifier and is used to process the amplified voltage signal output by the second burst mode transimpedance amplifier to obtain the second data signal.

7. The optical communication device of claim 4 or 5, wherein, The processing unit includes a second switch, a third processing chip, and a fourth processing chip, wherein the second switch is connected to the third processing chip, the fourth processing chip, and the amplification unit, respectively. The second switch is used to connect the output terminal of the amplification unit to the third processing chip when the first rate indication signal is received; Upon receiving the second rate indication signal, the output terminal of the amplification unit is connected to the fourth processing chip, wherein the data transmission rate indicated by the first rate indication signal is less than the data transmission rate indicated by the second rate indication signal. The third processing chip is used to process the amplified voltage signal output by the amplification unit to obtain the first data signal; The fourth processing chip is used to process the amplified voltage signal output by the amplification unit to obtain the second data signal.

8. The optical communication device of claim 4 or 5, wherein, The processing unit includes a fifth processing chip, which includes a first output channel and a second output channel. The fifth processing chip is configured to, when receiving a first rate selection signal, process the amplified voltage signal output by the amplification unit according to a first data transmission rate corresponding to the first rate selection signal, and output a first data signal through the first output channel; and when receiving a second rate selection signal, process the amplified voltage signal output by the amplification unit according to a second data transmission rate corresponding to the second rate selection signal, and output a second data signal through the second output channel, wherein the first data transmission rate is less than the first data transmission rate.

9. The optical communication device of any of claims 1 to 8, wherein, The data transmission rate of the first optical signal is 1Gbps, and the data transmission rate of the second optical signal is 12.5Gbps, 25Gbps, or 50Gbps.

10. The optical communication device of claim 9, wherein, The uplink optical signal also includes a third optical signal, the data transmission rate of which is 1Gbps or 10Gbps.

11. An optical network device, characterized in that, It includes a single board and an optical communication device as described in any one of claims 1 to 10, wherein the optical communication device is connected to the single board.

Images