Optical communication device and optical network equipment

Abstract

The utility model discloses an optical communication device and optical network equipment, and belongs to the technical field of optical communication. The optical communication device comprises an optical splitter, a first receiving assembly and a second receiving assembly. The optical splitter is used for splitting an uplink optical signal into a first path of optical signal and a second path of optical signal; the first receiving component is used for receiving an optical signal in a first uplink wavelength range sent by the first type of ONU from the first path of optical signal; and the second receiving component is used for receiving the optical signal of a second uplink wavelength range sent by the second type of ONU from the second path of optical signal, wherein the first uplink wavelength range is a proper subset of the second uplink wavelength range. The coexistence of the first type ONU and the second type ONU in the PON system can be realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical communication technology, in particular to an optical communication device and an optical network equipment. BACKGROUND

[0002] A passive optical network (PON) is a point-to-multipoint single fiber bidirectional optical access network. A PON system usually includes an optical line termination (OLT), an optical distribution network (ODN) and a plurality of optical network units (ONUs). The OLT is connected with the plurality of ONUs through the ODN.

[0003] With the development of optical communication technology, at a certain period, there are at least two ONUs supporting different media access control (MAC) protocols in a PON system. The uplink wavelength ranges adopted by the ONUs supporting different MAC protocols may overlap, resulting in conflicts of uplink data sent by the ONUs supporting different MAC protocols, and affecting the normal work of the PON system. UTILITY MODEL CONTENT

[0004] The present application provides an optical communication device and an optical network equipment, which can realize coexistence of a first type of ONU and a second type of ONU in a PON system with overlapping uplink wavelength ranges.

[0005] In a first aspect, the present application provides an optical communication device. The optical communication device includes a splitter, a first receiving assembly, a second receiving assembly and a processing assembly. The splitter is configured to split an uplink optical signal into a first optical signal and a second optical signal. The first receiving assembly is configured to receive, from the first optical signal, an optical signal of a first uplink wavelength range sent by a first type of optical network unit, and obtain a first electrical signal based on the optical signal of the first uplink wavelength range. The second receiving assembly is configured to receive, from the second optical signal, an optical signal of a second uplink wavelength range sent by a second type of optical network unit, and obtain a second electrical signal based on the optical signal of the second uplink wavelength range. The processing assembly is configured to obtain a data signal of the first type of optical network unit according to the first electrical signal corresponding to the optical signal of the first uplink wavelength range within a first time slot, and obtain a data signal of the second type of optical network unit according to the second electrical signal corresponding to the optical signal of the second uplink wavelength range within a second time slot, the first uplink wavelength range being a proper subset of the second uplink wavelength range. The first time slot and the second time slot do not overlap in the time domain.

[0006] In the present application, the first upstream wavelength range is the intersection of the wavelength range of the optical signals sent by the first type of ONU and the wavelength range of the optical signals sent by the second type of ONU, and thus the optical signals in the first upstream wavelength range are useful signals for both the first receiving assembly and the second receiving assembly. The optical signals in the wavelength range in the second upstream wavelength range other than the first upstream wavelength range are useless signals for the first receiving assembly and useful signals for the second receiving assembly. The upstream optical signals are split into the first optical signals and the second optical signals by the optical splitter, the first receiving assembly can obtain the optical signals in the first upstream wavelength range from the first optical signals, and thus the processing assembly can obtain the data signals of the first type of ONU according to the first electrical signals corresponding to the optical signals in the first upstream wavelength range in the first time slot, and the second receiving optical assembly can obtain the optical signals in the second upstream wavelength range from the second optical signals, and thus the processing assembly can obtain the data signals of the second type of ONU according to the second electrical signals corresponding to the optical signals in the second upstream wavelength range in the second time slot. In this way, the first receiving assembly and the second receiving assembly can both obtain useful signals, and thus the first type of ONU and the second type of ONU can coexist in the PON system.

[0007] Optionally, the optical splitter is configured to transmit a portion of the upstream optical signals to obtain the first optical signals, and reflect a portion of the upstream optical signals to obtain the second optical signals. That is, the optical splitter uses the principle of semi-transmission and semi-reflection to split the upstream optical signals into the first optical signals and the second optical signals.

[0008] Exemplarily, the optical splitter is a filter, which can be a power division filter or a wavelength division filter.

[0009] Optionally, the reflectivity of the filter in the first upstream wavelength range is less than the reflectivity of the filter in other wavelength ranges, and the other wavelength ranges are the wavelength ranges in the second upstream wavelength range other than the first upstream wavelength range. The optical signals in the first upstream wavelength range are useful signals for both the first receiving assembly and the second receiving assembly, and thus a portion of the optical signals in the first upstream wavelength range in the upstream optical signals can be transmitted to the first receiving assembly, and another portion of the optical signals in the first upstream wavelength range in the upstream optical signals can be transmitted to the second receiving assembly. The optical signals in the other wavelength ranges are useless signals for the first receiving assembly but useful signals for the second receiving assembly, and thus the reflectivity of the filter in the other wavelength ranges is relatively high, so that the optical signals in the other wavelength ranges can be more transmitted to the second receiving assembly, which is beneficial to the second receiving assembly to receive the optical signals sent by the second type of ONU.

[0010] Exemplarily, the filter has a reflectivity of 50% at the first uplink wavelength range, and has a reflectivity greater than 50% at other wavelength ranges. In this way, half of the optical signals in the first uplink wavelength range in the uplink optical signal can be transmitted to the first receiving assembly, and the other half can be transmitted to the second receiving assembly. The filter has a greater reflectivity at other wavelength ranges, so that more optical signals in the other wavelength ranges in the uplink optical signal can be transmitted to the second receiving assembly, which is beneficial to the second receiving assembly to receive optical signals sent by the second type of ONU.

[0011] Optionally, the first type of optical network unit supports a 50G PON protocol or a 25G PON protocol. When the first type of ONU supports the 50G PON protocol, the first uplink wavelength range is 1284 nm-1288 nm. When the first type of ONU supports the 25G PON protocol, the first uplink wavelength range is 1290 nm-1310 nm. When the second type of optical network unit supports an EPON protocol and uses a Fabry-Perot (FP) laser, the second uplink wavelength range is 1260 nm-1360 nm. In both cases, the first uplink wavelength range is a proper subset of the second uplink wavelength range.

[0012] Optionally, the processing assembly is further configured to obtain a data signal of a third type of optical network unit according to the second electrical signal corresponding to the optical signal in the second uplink wavelength range in a third time slot. The third type of ONU transmits an optical signal in a third uplink wavelength range, the third uplink wavelength range is a proper subset of the second uplink wavelength range, and has an empty intersection with the first uplink wavelength range. The third time slot does not overlap with the first time slot and the second time slot in the time domain. When there is also a third type of ONU in the PON system, the optical communication device can also receive the optical signal sent by the third type of ONU.

[0013] Optionally, the third type of optical network unit supports an EPON or a 10G EPON protocol and uses a distributed feedback laser. In this case, the third uplink wavelength range corresponding to the third type of ONU is 1260 nm-1280 nm or 1290 nm-1330 nm, which satisfies the relationship between the third uplink wavelength range and the second uplink wavelength range.

[0014] Optionally, the optical communication device further comprises a transmitting unit and a wavelength division multiplexer. The transmitting unit is configured to emit a downlink optical signal. The wavelength division multiplexer is configured to transmit the downlink optical signal and reflect the uplink optical signal to the optical splitter. By providing the wavelength division multiplexer, it is beneficial to realize single-fiber bidirectional transmission of the uplink optical signal and the downlink optical signal.

[0015] In a possible implementation, the downstream optical signal includes optical signals in a first downstream wavelength range and optical signals in a second downstream wavelength range, the first downstream wavelength range is a receiving wavelength range of the first type of optical network unit, and the intersection of the first downstream wavelength range and the second upstream wavelength range is empty, and the optical signals in the second downstream wavelength range are a receiving wavelength range of the second type of ONU; in this way, the optical communication device can not only receive optical signals sent by the first type of ONU and the second type of ONU, but also send optical signals to the first type of ONU and the second type of ONU, thereby realizing bidirectional communication between the optical communication device and the first type of ONU and bidirectional communication between the optical communication device and the second type of ONU.

[0016] Optionally, in the case that the optical communication device is also configured to receive optical signals sent by a third type of ONU, the downstream optical signal further includes optical signals in a third downstream wavelength range, and the third downstream wavelength range is a receiving wavelength range of the third type of optical network unit; in this way, the optical communication device can also communicate bidirectionally with the third type of ONU.

[0017] Optionally, the sending unit includes a first transmitting component, a second transmitting component, a third transmitting component, and a combining component. The first transmitting component is configured to transmit optical signals in the first downstream wavelength range, the second transmitting component is configured to transmit optical signals in the second downstream wavelength range, and the third transmitting component is configured to transmit optical signals in the third downstream wavelength range. The combining component is configured to combine the optical signals transmitted by the first transmitting component, the second transmitting component, and the third transmitting component to obtain the downstream optical signal. When the sending unit includes multiple transmitting components, in order to enable the optical signals transmitted by the multiple transmitting components to be transmitted through the same optical fiber, the optical signals transmitted by the multiple transmitting components need to be combined into one optical signal, i.e., the downstream optical signal, by the combining component.

[0018] Optionally, the wavelength division multiplexer is a filter, and the incident angle of the filter is less than or equal to 13°. Using a small-angle filter as the wavelength division multiplexer can separate optical signals with a narrower wavelength interval.

[0019] Optionally, the optical communication device further includes a first zero-degree band-pass filter, and the first zero-degree band-pass filter is located on an optical path between the first receiving component and the optical splitter. The first zero-degree band-pass filter allows optical signals in the first upstream wavelength range to pass through while blocking optical signals outside the first upstream wavelength range, thereby reducing the influence of stray light on the first receiving component, improving the isolation degree, and reducing optical crosstalk.

[0020] Optionally, the optical communication device further comprises a second zero-degree band-pass filter, which is located on the optical path between the second receiving component and the optical splitter. The second zero-degree band-pass filter allows the light in the second uplink wavelength range to pass through while blocking the light outside the second uplink wavelength range, so as to reduce the influence of stray light on the second receiving component, improve the isolation and reduce the optical crosstalk.

[0021] Optionally, the optical communication device is an optical module.

[0022] In a second aspect, the present application provides an optical network device, for example, an optical line terminal (OLT) or a master device in a fiber to the room (FTTR) network. Optionally, the optical network device comprises a single board and any of the optical communication devices described above, and the optical module is connected to the optical communication device. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a structure schematic diagram of a PON system provided by an embodiment of the present application;

[0024] Figure 2 is a relationship schematic diagram of wavelength ranges of various ONUs provided by an embodiment of the present application;

[0025] Figure 3 is a structure schematic diagram of an optical communication device provided by an embodiment of the present application;

[0026] Figure 4 is a relationship schematic diagram of reflectivity and wavelength of a filter provided by an embodiment of the present application;

[0027] Figure 5 is a relationship schematic diagram of reflectivity and wavelength of another filter provided by an embodiment of the present application. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the present application clearer, the embodiments of the present application will be further described in detail below with reference to the drawings.

[0029] Figure 1 is a structure schematic diagram of a PON system provided by an embodiment of the present application. As shown in Figure 1As shown, the PON system includes an optical line termination (OLT) at the central office, optical network units (ONUs) or optical network terminations (ONTs) at the customer premises, and an optical distribution network (ODN).

[0030] The OLT connects to the upper layer network side devices (such as switches, routers, etc.), and connects to one or more ODNs at the lower layer. Figure 1 As shown in FIG. 1, the ODN is connected to one ONU.

[0031] The function of the ODN is to distribute downstream data and to concentrate upstream data. The ODN has one upstream optical interface and several downstream optical interfaces. The optical signal received by the upstream optical interface is distributed to all downstream optical interfaces, and the optical signal received by the downstream optical interface is transmitted to the only upstream optical interface. The ODN can aggregate the upstream data from multiple ONUs and transmit the data to the OLT, and can also transmit the downstream data from the OLT to the ONUs. In the PON system, the transmission from the OLT to the ONUs is called downstream transmission, and vice versa. The downstream transmission is broadcast from the OLT to the ONUs, and the upstream transmission uses time division multiplexing, in which the ONUs transmit upstream data to the OLT according to the transmission time slots allocated by the OLT.

[0032] The ODN generally includes a passive optical splitter (also called a splitter), a trunk fiber, and branch fibers. Figure 1 The ODN in FIG. 1 has a one-stage splitter structure. The fiber before the splitter (near the OLT side) is the trunk fiber, and the fiber after the splitter (near the ONU side) is the branch fiber. If the ODN has a two-stage splitter structure, the ODN includes one first-stage splitter, multiple second-stage splitters, and trunk, distribution, and branch fibers. The fiber before the first-stage splitter is the trunk fiber, the fiber after the second-stage splitter is the branch fiber, and the fiber between the first-stage splitter and the second-stage splitter is the distribution fiber.

[0033] An ONU provides a user-side interface for an optical access network (OAN) and is connected to an ODN. If the ONU also provides user port functions, such as Ethernet user ports or plain old telephone service (POTS) user ports, it is referred to as an optical network termination (ONT). It should be noted that, unless otherwise specified, the ONU referred to in the embodiments of the present application includes both ONUs and ONTs.

[0034] With the release of the 50-gigabit-capable passive optical network (50GPON) standard, 50G PON becomes the only choice for the next generation of PONs after 10-gigabit-capable passive optical network (10G PON) and 10-gigabit-capable Ethernet passive optical network (10G EPON). The 10G PON can include 10-gigabit-capable passive optical network (XG-PON) and 10-gigabit-capable symmetric passive optical network (XGSPON).

[0035] In order to realize the smooth upgrade of the PON system, the ONU supporting the 50G PON protocol needs to coexist with the existing generation of ONUs for a period of time. For example, Figure 1 In this embodiment, three types of ONUs supporting the 50G PON protocol, the EPON protocol, and the 10G EPON protocol coexist in the PON system. In other embodiments, it is also possible that two types of ONUs supporting the 50G PON protocol and the EPON protocol coexist.

[0036] However, in the wavelength coexistence option of the 50G PON standard, the uplink wavelength of the 50G PON is set to 1286±2 nm, which overlaps with the uplink wavelength 1310±50 nm of some ONUs in the existing Ethernet passive optical network (EPON), and thus cannot be wavelength coexistent.

[0037] To this end, an embodiment of the present application provides an optical communication device, which divides an uplink optical signal into a first path optical signal and a second path optical signal by setting an optical splitter, the two path optical signals both containing optical signals sent by all ONUs, and receives the first path optical signal by a first receiving assembly and receives the second path optical signal by a second receiving assembly. In this way, the first receiving assembly and the second receiving assembly can both obtain optical signals of respective corresponding wavelength ranges from the received optical signals, so that the first type of ONUs and the second type of ONUs can coexist in the PON system.

[0038] Figure 2 is a structural schematic diagram of an optical communication device provided by an embodiment of the present application. The optical communication device can be part of an OLT in Figure 1 , for example, can be implemented as part of or all of an optical module in the OLT. As shown in Figure 2 , the optical communication device includes an optical splitter 23, a first receiving assembly 21, a second receiving assembly 22 and a processing assembly 4. The optical splitter 23 is configured to divide an uplink optical signal into a first path optical signal and a second path optical signal. The first receiving assembly 21 is configured to receive a first uplink wavelength range optical signal sent by a first type of ONU from the first path optical signal, and obtain a first electrical signal based on the first uplink wavelength range optical signal. The second receiving assembly 22 is configured to receive a second uplink wavelength range optical signal sent by a second type of ONU from the second path optical signal, and obtain a second electrical signal based on the second uplink wavelength range optical signal. The processing assembly 4 is configured to obtain a data signal of the first type of ONU according to the first electrical signal corresponding to the first uplink wavelength range optical signal in a first time slot, and obtain a data signal of the second type of ONU according to the second electrical signal corresponding to the second uplink wavelength range optical signal in a second time slot. The first uplink wavelength range is a proper subset of the second uplink wavelength range.

[0039] , the first time slot is a sending time slot allocated to the first type of ONU by the OLT, and the second time slot is a sending time slot allocated to the second type of ONU by the OLT. The first time slot and the second time slot do not overlap in the time domain.

[0040] In the embodiment of the present application, the first uplink wavelength range is a true subset of the second uplink wavelength range, that is, the first uplink wavelength range is the intersection of the first uplink wavelength range of the optical signals sent by the first type of ONU and the second uplink wavelength range of the optical signals sent by the second type of ONU, thus, the optical signals in the first uplink wavelength range are useful signals for the first receiving assembly 21 and the second receiving assembly 22. The optical signals in the wavelength range of the second uplink wavelength range except the first uplink wavelength range are useless signals for the first receiving assembly 21 and useful signals for the second receiving assembly 22. The uplink optical signals are divided into the first optical signals and the second optical signals by the optical splitter 23, the first receiving assembly 21 can obtain the optical signals in the first uplink wavelength range from the first optical signals, thus the processing assembly 4 can obtain the data signals of the first type of ONU according to the first electrical signals corresponding to the optical signals in the first uplink wavelength range in the first time slot, and the second receiving assembly 22 can obtain the optical signals in the second uplink wavelength range from the second optical signals, thus the processing assembly 4 can obtain the data signals of the second type of ONU according to the second electrical signals corresponding to the optical signals in the second uplink wavelength range in the second time slot. In this way, the first receiving assembly 21 and the second receiving assembly 22 can obtain their own useful signals, thus the first type of ONU and the second type of ONU can coexist in the PON system.

[0041] Optionally, in the embodiment shown in Figure 1 In the embodiment shown, the first type of ONU supports the 50G PON protocol, the first uplink wavelength range is 1284nm-1288nm, the second type of ONU supports the EPON protocol and uses the FP laser, and the second uplink wavelength range is 1260nm-1360nm. In this case, the first uplink wavelength range is a true subset of the second uplink wavelength range. In other embodiments, the first type of ONU supports the 25G PON protocol, when the first type of ONU supports the 25G PON protocol, the first uplink wavelength range is 1290nm-1310nm, in this case, the first uplink wavelength range is also a true subset of the second uplink wavelength range.

[0042] Optionally, the processing component 4 is further configured to obtain the data signal of the third type of ONU based on the second electrical signal corresponding to the optical signal in the second uplink wavelength range within the third time slot. The third type of ONU transmits the optical signal in the third uplink wavelength range, which is a proper subset of the second uplink wavelength range and has no intersection with the first uplink wavelength range. Since the third uplink wavelength range is a proper subset of the second uplink wavelength range, when there is an optical signal transmitted by the third type of ONU, the second optical signal received by the second receiving component 22 includes the optical signal in the third uplink wavelength range transmitted by the third type of ONU. Therefore, the second receiving component can obtain the data signal of the third type of ONU based on the optical signal in the third uplink wavelength range within the third time slot. Here, since each ONU transmits uplink optical signals in a time-division manner under the scheduling of the OLT, the second optical signal received by the second receiving component 22 at the same time includes either the optical signal in the second uplink wavelength range transmitted by the second type of ONU or the optical signal in the third uplink wavelength range transmitted by the third type of ONU. The third time slot is the transmission time slot allocated by the OLT to the third type of ONU. The third time slot does not overlap with the aforementioned first and second time slots in the time domain.

[0043] In this embodiment, the second receiving component 22 is used to receive optical signals transmitted by both the second type of ONU and the third type of ONU. This optical communication device enables the coexistence of three types of ONUs, and by receiving optical signals transmitted by two types of ONUs through a single receiving component, it is beneficial to reduce the number of devices included in the optical communication device and simplify its structure.

[0044] Optionally, the third type of ONU supports EPON or 10G EPON protocols and uses a distributed feedback (DFB) laser. In this case, the third uplink wavelength range is 1260nm-1280nm or 1290nm-1330nm, which is a proper subset of the aforementioned second uplink wavelength range.

[0045] Figure 3 This is a schematic diagram showing the relationship between the wavelength ranges of the three types of ONUs. For example... Figure 3 As shown, the first uplink wavelength range of the first type of ONU is 1284nm-1288nm, the second uplink wavelength range of the second type of ONU is 1260nm-1360nm, and the third uplink wavelength range of the third type of ONU is 1260nm-1280nm or 1290nm-1330nm. From... Figure 3 It can be seen that both the first and third uplink wavelength ranges are proper subsets of the second uplink wavelength range.

[0046] Optionally, the optical splitter 23 is a filter, also known as a thin-film filter (TFF). In implementation, the filter can be a power-splitting filter or a wavelength-splitting filter. The power-splitting filter is used to split the upstream optical signal into two optical signals according to power, for example, into two optical signals with equal power. The wavelength-splitting filter is used to separate the upstream optical signal according to wavelength to form the first optical signal and the second optical signal. Using the filter as the optical splitter 23 is advantageous in reducing the size of the optical communication device. In other embodiments, the optical communication device can also use a grating optical splitter, etc.

[0047] Exemplarily, the filter is used to transmit a part of the upstream optical signal to obtain the first optical signal, and reflect another part of the upstream optical signal to obtain the second optical signal.

[0048] In one possible implementation, the reflectivity of the filter in the second upstream wavelength range is a fixed value. Figure 4 is a schematic diagram of the relationship between the reflectivity of a filter and wavelength provided by an embodiment of the present application. As shown in Figure 4 , the reflectivity of the filter in the second upstream wavelength range is 50%. Since the sum of the reflectivity and the transmittance of the filter is equal to 1, the reflectivity of the filter in the second upstream wavelength range is also 50%. In this way, the filter can transmit half of the upstream optical signal to the first receiving assembly 21 and reflect the other half of the upstream optical signal to the second receiving assembly 22. In this case, the filter is a power-splitting filter, which can also be referred to as a semi-transmissive and semi-reflective film.

[0049] In another possible implementation, the reflectivity of the filter in the first upstream wavelength range is different from the reflectivity of the filter in other wavelength ranges. Since the sum of the reflectivity and the transmittance of the filter is equal to 1, the transmittance of the filter in the first upstream wavelength range is different from the transmittance of the filter in other wavelength ranges. The other wavelength ranges are wavelength ranges in the second upstream wavelength range except the first upstream wavelength range.

[0050] Exemplarily, the reflectivity of the filter in the first upstream wavelength range is less than the reflectivity of the filter in other wavelength ranges. The optical signals in the other wavelength ranges are useless signals for the first receiving assembly 21, but are useful signals for the second receiving assembly 22. Therefore, in the other wavelength ranges, the reflectivity of the filter is larger, which can make more optical signals in the other wavelength ranges be transmitted to the second receiving assembly 22, and is advantageous for the second receiving assembly 22 to receive the optical signals sent by the second type of ONU.

[0051] Figure 5 is a schematic diagram of the relationship between the reflectivity of another filter and wavelength provided by an embodiment of the present application. As shown in Figure 5As shown, the reflectivity of the filter in the first upstream wavelength range is 50%, and the reflectivity of the filter in other wavelength ranges is 70%. In implementation, the reflectivity of the filter in other wavelength ranges can be other values greater than 50%, such as 60%, 75%, 80%, 85%, 90%, 95%, 100%, etc. The reflectivity of the filter in the first upstream wavelength range is 50%, which can transmit half of the optical signals in the first upstream wavelength range in the upstream optical signal to the first receiving assembly 21 and the other half to the second receiving assembly 22, which is beneficial for the first receiving assembly 21 and the second receiving assembly 22 to receive the optical signals sent by the corresponding ONUs. While the reflectivity of the filter in other wavelength ranges is relatively large, which can make more optical signals in other wavelength ranges in the upstream optical signal be transmitted to the second receiving assembly 22, which is beneficial for the second receiving assembly 22 to receive the optical signals sent by the second type of ONUs.

[0052] In implementation, the filter can include a plurality of layers of high-refractive-index medium layers and low-refractive-index medium layers alternately stacked. By selecting appropriate materials, thicknesses, and numbers of layers of the high-refractive-index medium layers and the low-refractive-index medium layers, a filter with a desired reflectivity can be obtained. The embodiments of the present application do not limit this.

[0053] In the example shown in FIG. 1, the first receiving assembly 21 is configured to receive the optical signals in the first upstream wavelength range sent by the first type of ONUs, and the second receiving assembly 22 is configured to receive the optical signals in the second upstream wavelength range sent by the second type of ONUs and the optical signals in the third upstream wavelength range sent by the third type of ONUs. Figure 5 In the example shown, the transition band of the filter is located between 1280nm-1284nm and 1288nm-1292nm, so as to reduce the influence on the optical signals sent by the third type of ONUs.

[0054] Optionally, the first receiving assembly 21 includes a first receiver 21a and a first processing circuit 21b. The first receiver 21a is configured to perform photoelectric conversion on the optical signals in the first upstream wavelength range sent by the first type of ONUs to obtain a first electrical signal. The first processing circuit 21b is configured to process the first electrical signal, for example, amplification, etc.

[0055] Optionally, the second receiving assembly 22 includes a second receiver 22a and a second processing circuit 22b. The second receiver 22a is configured to perform photoelectric conversion on the optical signals in the second upstream wavelength range sent by the second type of ONUs and the optical signals in the third upstream wavelength range sent by the third type of ONUs to obtain a second electrical signal. The second processing circuit 22b is configured to process the second electrical signal, for example, amplification, etc.

[0056] In the example shown in FIG. 1, the first receiving assembly 21 includes a first receiver 21a and a first processing circuit 21b. The first receiver 21a is configured to perform photoelectric conversion on the optical signals in the first upstream wavelength range sent by the first type of ONUs to obtain a first electrical signal. The first processing circuit 21b is configured to process the first electrical signal, for example, amplification, etc.

[0057] In implementation, the first processing circuit 21b and the second processing circuit 22b can each include a physical layer chip or an optical digital signal processor (ODSP). The first processing circuit 21b and the second processing circuit 22b are configured to convert the physical layer signals into data signals. Optionally, the first processing circuit 21b and the second processing circuit 22b can include a codec, a clock and data recovery circuit, an amplification circuit, etc., and can implement the functions of data encoding and decoding, clock synchronization, signal amplification and recovery.

[0058] The processing component 4 can include a media access control (MAC) chip, etc. The processing component 4 is electrically connected with the aforementioned receiving components to receive the electrical signals output by the first receiving component and the second receiving component. According to the time slot allocation information, the processing component 4 determines to receive the data signals from the first receiving component or the second receiving component in the target time slot. The processing component 4 is further configured to allocate the transmission time slots to various ONUs in the PON system, and to uniformly schedule the various ONUs in the PON system to transmit the uplink optical signals in the allocated transmission time slots.

[0059] Optionally, the optical communication device further includes a first zero-degree band-pass filter 24a located on the optical path between the first receiving component 21 and the optical splitter 23. The first zero-degree band-pass filter 24a allows the light in the first uplink wavelength range to pass through while blocking the light outside the first uplink wavelength range, so as to reduce the influence of stray light on the first receiving component 21, improve the isolation and reduce the optical crosstalk.

[0060] Optionally, the optical communication device further includes a second zero-degree band-pass filter 24b located on the optical path between the second receiving component 22 and the optical splitter 23. The second zero-degree band-pass filter 24b allows the light in the second uplink wavelength range to pass through while blocking the light outside the second uplink wavelength range, so as to reduce the influence of stray light on the second receiving component 22, improve the isolation and reduce the optical crosstalk.

[0061] Optionally, the optical communication device can further include one or more mirrors to adjust the propagation paths of the first optical signal and the second optical signal according to the relative positions of the first receiving component 21 and the optical splitter 23 and the relative positions of the second receiving component 22 and the optical splitter 23. For example, Figure 2In the embodiment shown, the optical communication device is capable of receiving optical signals sent by the first type of ONU, the second type of ONU and the third type of ONU. In other embodiments, the optical communication device can be configured to receive optical signals sent by only two of the first type of ONU, the second type of ONU and the third type of ONU. For example, the optical communication device can be configured to receive optical signals sent by the first type of ONU and the second type of ONU.

[0062] It should be noted that, in the embodiment shown, Figure 2 In the embodiment shown, the optical communication device is capable of receiving optical signals sent by the first type of ONU, the second type of ONU and the third type of ONU. In other embodiments, the optical communication device can be configured to receive optical signals sent by only two of the first type of ONU, the second type of ONU and the third type of ONU. For example, the optical communication device can be configured to receive optical signals sent by the first type of ONU and the second type of ONU.

[0063] Optionally, the optical communication device further comprises a transmitting unit 3 and a wavelength division multiplexer 1. The transmitting unit 3 is configured to transmit a downstream optical signal. When the optical communication device needs to communicate with the first type of ONU and the second type of ONU simultaneously, the downstream optical signal comprises optical signals in a first downstream wavelength range and optical signals in a second downstream wavelength range, the first downstream wavelength range being the receiving wavelength range of the first type of ONU, and the second downstream wavelength range being the receiving wavelength range of the second type of ONU. The wavelength division multiplexer 1 is configured to transmit the downstream optical signal and reflect the upstream optical signal to the beam splitter 23, so that single-fiber bidirectional transmission of the upstream optical signal and the downstream optical signal can be achieved. In this way, the optical communication device is capable of receiving optical signals sent by the first type of ONU and the second type of ONU, and transmitting optical signals to the first type of ONU and the second type of ONU, so as to realize bidirectional communication between the optical communication device and the first type of ONU and bidirectional communication between the optical communication device and the second type of ONU.

[0064] In the embodiment shown, the intersection of the first downstream wavelength range and the second upstream wavelength range is empty, i.e., the first downstream wavelength range and the second upstream wavelength range do not overlap. If the first downstream wavelength range and the second upstream wavelength range overlap, the optical signals in the wavelength range of the upstream optical signal and the first downstream wavelength range will be transmitted by the wavelength division multiplexer 1, which will interfere with the downstream optical signal. Therefore, in the embodiment, the first downstream wavelength range is outside the second upstream wavelength range, so as to avoid the wavelength division multiplexer 1 transmitting the optical signals in the wavelength range of the upstream optical signal and the first downstream wavelength range.

[0065] Exemplarily, the lower limit of the first downlink wavelength range is greater than 1360 nm, that is, the first downlink wavelength range is on the long-wavelength side of the aforementioned second uplink wavelength range. This is because the wavelengths on the short-wavelength side (i.e., less than 1260 nm) of the second downlink wavelength range are mostly occupied, and thus the first downlink wavelength range can be set on the long-wavelength side of the second uplink wavelength range.

[0066] When implemented, the center wavelength of the first downlink wavelength range can be 1365 nm or 1366 nm. For example, the first downlink wavelength range can be 1363 nm-1367 nm or 1364 nm-1368 nm.

[0067] Optionally, the sending unit 3 comprises a first transmitting component 31, a second transmitting component 32 and a combining component 30. The first transmitting component 31 is configured to transmit optical signals in the first downlink wavelength range, and the second transmitting component 32 is configured to transmit optical signals in the second downlink wavelength range. The combining component 30 is configured to combine the optical signals transmitted by the first transmitting component 31 and the second transmitting component 32 to obtain the downlink optical signal. When the sending unit 3 comprises multiple transmitting components, in order to enable the optical signals transmitted by the multiple transmitting components to be transmitted through the same optical fiber, the optical signals transmitted by the multiple transmitting components need to be combined into one optical signal, i.e., the downlink optical signal, by the combining component.

[0068] Optionally, when the optical communication device also needs to communicate with the aforementioned third type of ONU, the sending unit 3 further comprises a third transmitting component 33, which is further configured to transmit optical signals in a third downlink wavelength range, the third downlink wavelength range being the receiving wavelength range of the third type of ONU. The combining component 30 is further configured to combine the optical signals transmitted by the third transmitting component 33 with the optical signals transmitted by the first transmitting component 31 and the second transmitting component 32, that is, the downlink optical signal comprises the optical signals transmitted by the first transmitting component 31, the second transmitting component 32 and the third transmitting component 33.

[0069] Exemplarily, the combining component 30 can comprise a first filter 30a and a second filter 30b. The first filter 30a is capable of transmitting optical signals in the first downlink wavelength range and reflecting optical signals in the second downlink wavelength range, thereby combining the optical signals transmitted by the first transmitting component 31 and the second transmitting component 32. The second filter 30b is capable of transmitting optical signals in the first downlink wavelength range and the second downlink wavelength range and reflecting optical signals in the third downlink wavelength range, thereby combining the optical signals transmitted by the first transmitting component 31, the second transmitting component 32 and the third transmitting component 33 into one optical signal.

[0070] Optionally, the wavelength division multiplexer 1 is a filter, and an incident angle of the filter is less than or equal to 13°. That is, an angle between a normal line of the filter and an optical axis of the optical fiber is less than or equal to 13°. For example, the incident angle of the filter is equal to 13° or 8° or 6°, etc. By using a filter with a small incident angle as the wavelength division multiplexer 1, optical signals with a narrower wavelength interval can be separated. For example, assuming that the first downstream wavelength range is 1364nm-1368nm, and the second upstream wavelength range is 1260nm-1360nm, and the interval between the first downstream wavelength range and the second upstream wavelength range is 4nm, in this case, by using a filter with an incident angle of 6°, the optical signal in the first downstream wavelength range and the optical signal in the second upstream wavelength range can be better separated.

[0071] It should be noted that, in the embodiments shown in Figure 3 In the embodiments shown in FIG. 1, the transmitting unit 3 includes three transmitting components. In other embodiments, the first transmitting component, the second transmitting component and the third transmitting component can be integrated together to realize three-in-one (integration of three types of transmitting components), that is, the optical signals in the first downstream wavelength range, the second downstream wavelength range and the third downstream wavelength range are transmitted by one transmitting component. Alternatively, in other embodiments, the transmitting components corresponding to the two types of ONUs can be integrated together to improve the integration degree of the optical communication device. For example, the transmitting components corresponding to the first type of ONU and the third type of ONU can be integrated together. Since the first downstream wavelength range and the third downstream wavelength range have a relatively narrow width, the laser is relatively sensitive to temperature, and the transmitting components corresponding to the first type of ONU and the third type of ONU can share a temperature adjusting structure (for example, a semiconductor cooler), which is beneficial to reducing the cost.

[0072] The embodiments of the present application do not limit the packaging form of the transmitting components and the receiving components, which can be TO (through-hole) packaging or BOX (box) packaging, etc.

[0073] In some examples, the optical communication device is an optical module. The optical module is a signal transmission device capable of realizing photoelectric and electro-optical conversion, which can convert an electrical signal into an optical signal and output the optical signal at the transmitting end, and can convert an input optical signal into an electrical signal at the receiving end.

[0074] In other examples, the optical communication device is an optical network device. For example, an OLT or a master device (also referred to as a master gateway, etc.) in an FTTR network, etc. In this case, the optical network device includes a single board and an optical module, and the optical module is connected to the single board. The optical module can include the foregoing receiving components, the optical splitter, the transmitting components, the combining component and the wavelength division multiplexer, which are integrated in the optical module.

[0075] For example, the processing component 4 is set on the single board as a master control unit.

[0076] Unless otherwise defined, technical terms or scientific terms used herein shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terms "first", "second", "third" and similar terms used herein do not denote any order, quantity, or importance, but are used to distinguish one element from another, and the terms "a" and "an" and "the" and similar terms used herein mean "one or more". The terms "including", "comprising", "consisting of", and the like, used herein are meant to be equivalent to the term "comprising" and therefore should not be interpreted as a limitation. The term "plurality" as used herein means two or more. A and / or B means that there are three cases: A; B; and A and B.

[0077] The above merely provides an example of the application, and is not intended to limit the application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application shall be included in the protection scope of the application.

Claims

1. An optical communication device, characterized in that, The optical communication device includes: a beam splitter, a first receiving component, a second receiving component, and a processing component; The optical splitter is used to split the uplink optical signal into a first optical signal and a second optical signal; The first receiving component is used to receive an optical signal with a first uplink wavelength range sent by a first type of optical network unit from the first optical signal, and to obtain a first electrical signal based on the optical signal with the first uplink wavelength range; The second receiving component is used to receive an optical signal with a second uplink wavelength range sent by a second type of optical network unit from the second optical signal, and to obtain a second electrical signal based on the optical signal with the second uplink wavelength range; The processing component is used to obtain the data signal of the first type of optical network unit based on the first electrical signal corresponding to the optical signal of the first uplink wavelength range in the first time slot; and to obtain the data signal of the second type of optical network unit based on the second electrical signal corresponding to the optical signal of the second uplink wavelength range in the second time slot, wherein the first uplink wavelength range is a proper subset of the second uplink wavelength range, and the first time slot and the second time slot do not overlap in the time domain.

2. The optical communication device according to claim 1, characterized in that, The beam splitter is a filter, which is used to transmit a portion of the uplink optical signal to obtain the first optical signal; and to reflect a portion of the uplink optical signal to obtain the second optical signal.

3. The optical communication device according to claim 2, characterized in that, The reflectivity of the filter in the first uplink wavelength range is less than the reflectivity of the filter in other wavelength ranges, where other wavelength ranges are wavelength ranges in the second uplink wavelength range other than the first uplink wavelength range.

4. The optical communication device according to any one of claims 1 to 3, characterized in that, The first type of optical network unit supports the 50G passive optical network (PON) protocol or the 25G PON protocol, while the second type of optical network unit supports the EPON protocol and uses a Fabry-Perot FP laser.

5. The optical communication device according to claim 4, characterized in that, The processing component is further configured to obtain a data signal of a third type of optical network unit based on the second electrical signal corresponding to the optical signal of the second uplink wavelength range in the third time slot. The third type of optical network unit is used to transmit an optical signal of a third uplink wavelength range. The third uplink wavelength range is a proper subset of the second uplink wavelength range and has no intersection with the first uplink wavelength range. The third time slot does not overlap with the first time slot and the second time slot in the time domain.

6. The optical communication device according to claim 5, characterized in that, The third type of optical network unit supports EPON or 10G EPON protocols and uses distributed feedback lasers.

7. The optical communication device according to any one of claims 1 to 3, characterized in that, It also includes a transmitting unit and a wavelength division multiplexer. The transmitting unit is used to transmit downlink optical signals. The downlink optical signals include optical signals in a first downlink wavelength range and optical signals in a second downlink wavelength range. The first downlink wavelength range is the receiving wavelength range of the first type of optical network unit, and the intersection of the first downlink wavelength range and the second uplink wavelength range is empty. The second downlink wavelength range is the receiving wavelength range of the second type of optical network unit. The wavelength division multiplexer is used to transmit the downlink optical signal and reflect the uplink optical signal to the beam splitter.

8. The optical communication device according to claim 5 or 6, characterized in that, It also includes a transmitting unit and a wavelength division multiplexer. The transmitting unit is used to transmit downlink optical signals. The downlink optical signals include optical signals in a first downlink wavelength range, optical signals in a second downlink wavelength range, and optical signals in a third downlink wavelength range. The first downlink wavelength range is the receiving wavelength range of the first type of optical network unit, and the intersection of the first downlink wavelength range and the second uplink wavelength range is empty. The second downlink wavelength range is the receiving wavelength range of the second type of optical network unit, and the third downlink wavelength range is the receiving wavelength range of the third type of optical network unit. The wavelength division multiplexer is used to transmit the downlink optical signal and reflect the uplink optical signal to the beam splitter.

9. The optical communication device according to claim 8, characterized in that, The transmitting unit includes a first transmitting component, a second transmitting component, a third transmitting component, and a multiplexing component. The first transmitting component is used to transmit optical signals within the first downlink wavelength range; The second transmitting component is used to transmit optical signals in the second downlink wavelength range; The third transmitting component is used to transmit optical signals in the third downlink wavelength range; The multiplexing component is used to combine the optical signals emitted by the first transmitting component, the second transmitting component, and the third transmitting component to obtain the downlink optical signal.

10. The optical communication device according to claim 7, characterized in that, The wavelength division multiplexer is a filter with an incident angle of less than or equal to 13°.

11. The optical communication device according to any one of claims 1 to 3, 5 to 6, and 9 to 10, characterized in that, Also includes: A first zero-degree bandpass filter is located in the optical path between the first receiving component and the beam splitter; And / or, The second zero-degree bandpass filter is located in the optical path between the second receiving component and the beam splitter.

12. 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 11, wherein the optical communication device is connected to the single board.

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