Wave spreading device, optical system, and wave spreading method

Abstract

The invention provides a wave spreading device, an optical system and a wave spreading method, and belongs to the technical field of optical communication. The wave spreading device comprises a Twin WSS and a first optical amplifier. The Twin WSS has a plurality of first input ports, a first output port, a second input port, and a second output port. The first optical amplifier is located between the first output port and the second input port of the Twin WSS. During wave spreading, the Twin WSS receives the multiple upper-wave light beams through the multiple first input ports, the multiple upper-wave light beams are combined into a combined light beam, and the combined light beam is sent to the first optical amplifier through the first output port. The first optical amplifier amplifies the combined light beam and enables the combined light beam to enter a second input port of the Twin WSS in a loopback mode. And the Twin WSS filters the combined beam, and sends the filtered combined beam through the second output port.

Description

Technical Field

[0001] The present disclosure relates to the field of optical communication technology, and in particular to a wave expansion device, an optical system and a wave expansion method. Background Art

[0002] The power division network wavelength division system refers to a wavelength division system that uses a splitter to split light and a coupler to combine light. The power division network wavelength division system has multiple add-in ports and multiple drop-in ports, and can receive add-in light beams through the add-in ports, and send drop-in light beams through the drop-in ports.

[0003] As business grows, the number of ports required by the power division network wavelength division system may increase. Summary of the invention

[0004] The present disclosure provides a wave expansion device, an optical system and a wave expansion method. The wave expansion device includes a twin wavelength selective switch (Twin WSS) and a first optical amplifier. The Twin WSS combines multiple wavelength beams into a combined beam and sends the combined beam to the first optical amplifier. Then, the Twin WSS receives the combined beam amplified by the first optical amplifier, and filters the combined beam to eliminate the out-of-band amplifier spontaneous emission (ASE) noise of the combined beam. After that, the filtered combined beam is sent out. The technical solutions of the wave expansion device, the optical system and the wave expansion method are described as follows.

[0005] In a first aspect, the present disclosure provides a wave expansion device. The wave expansion device includes a Twin WSS and a first optical amplifier. The Twin WSS has a first input port, a first output port, a second input port, and a second output port, and the first input port is multiple. The input end of the first optical amplifier is connected to the first output port of the Twin WSS, and the output end of the first optical amplifier is connected to the second input port of the Twin WSS. The Twin WSS receives multiple wave beams through multiple first input ports, combines the multiple wave beams into a combined beam, and sends the combined beam to the first optical amplifier through the first output port. The Twin WSS receives the combined beam amplified by the first optical amplifier through the second input port, filters the combined beam, and sends the filtered combined beam through the second output port.

[0006] Among them, Twin WSS has two sets of independently usable WSS components inside, and these two sets of WSS components share various optical elements except the input and output units, but can receive separate control. One set of WSS components is located between multiple first input ports and first output ports, and the other WSS component is located between the second input port and the second output port. The light beam incident from the first input port of TwinWSS passes through the WSS components inside Twin WSS and then exits from the first output port. The light beam incident from the second input port of Twin WSS also passes through the WSS components inside Twin WSS and exits from the second output port. It can be seen that Twin WSS can perform programmable operations on the waveforms of the light beam incident from the first input port and the light beam incident from the second input port.

[0007] The multiple first input ports of Twin WSS are used to receive multiple uplink beams respectively, and the second output port of Twin WSS is used to connect to an uplink port of the power division network wavelength division system. In this way, the wave expansion device can expand one uplink port into multiple first input ports.

[0008] The first optical amplifier is used to amplify the combined light beam to compensate for the insertion loss of the added light beam. When the first optical amplifier amplifies the combined light beam, out-of-band ASE noise is generated. If the out-of-band ASE noise is combined into the main signal of the power division network wavelength division system, it will affect the performance of the existing services of the power division network wavelength division system. Therefore, filtering the combined light beam in the present disclosure refers to filtering out the out-of-band ASE noise in the combined light beam.

[0009] The technical solution provided by the present disclosure is that the Twin WSS receives multiple uplink light beams through multiple first input ports, combines the multiple uplink light beams into a combined light beam, and sends the combined light beam to the first optical amplifier through the first output port. The first optical amplifier amplifies the combined light beam, and generates out-of-band ASE noise while amplifying. The combined light beam carrying the out-of-band ASE noise is looped back and incident on the second input port of the Twin WSS. The Twin WSS filters out the out-of-band ASE noise in the combined light beam, and sends the filtered combined light beam to the upper wave port of the power division network wavelength division system through the second output port. It can be seen that by adopting the wave expansion device provided by the present disclosure, not only the expansion of the upper wave beam is achieved, but also the out-of-band ASE noise generated at the first optical amplifier can be avoided from being combined into the main signal of the power division network wavelength division system, thereby reducing the impact of the expanded upper wave beam on the performance of existing services of the power division network wavelength division system.

[0010] Moreover, in the above technical solution, the Twin WSS combines multiple uplink beams into a combined beam, which is amplified by the first optical amplifier and then looped back into the Twin WSS and filtered by the Twin WSS. It can be seen that a Twin WSS can complete the combination of uplink beams and the filtering of combined beams, which reduces the number of components included in the expansion device, improves the integration density, simplifies the fiber connection process, and reduces the cost.

[0011] In a possible implementation, the Twin WSS further includes one or more output optical fibers. The second output port and the output optical fiber are both optical output components corresponding to the second input port of the Twin WSS. The second output port and the output optical fiber are both optical output components corresponding to the second input port of the Twin WSS, which means that the second output port and the output optical fiber can both output a light beam input from the second input port.

[0012] The technical solution provided by the present disclosure is that the second input port of the Twin WSS in the related art corresponds to multiple optical output components, while the present disclosure only uses one optical output component (i.e., the second output port). Therefore, the port components of other optical output components can be removed, and only the output optical fiber is retained to reduce costs.

[0013] In a possible implementation manner, the optical performance of the optical signal output by the second output port is not inferior to the optical performance of the optical signal output by the output optical fiber.

[0014] In a possible implementation, the optical performance of the optical signal output by the second output port is better than the optical performance of the optical signal output by the output optical fiber, wherein the optical performance includes at least one of insertion loss and bandwidth.

[0015] The technical solution provided by the present disclosure can test the optical performance of optical signals output by the multiple optical output components when selecting the second output port from the multiple optical output components corresponding to the second input port, and retain the optical output component with the best optical performance as the second output port, remove the port components of other optical output components, and only retain the output optical fiber.

[0016] In a possible implementation manner, the output end of the output optical fiber is not connected to the port component.

[0017] In a possible implementation manner, the optical output component corresponding to the second input port of the Twin WSS only includes the second output port.

[0018] In a possible implementation, the wave expansion device further includes a second optical amplifier and a first optical splitter. The first optical splitter has a third input port and a plurality of third output ports. The input end of the second optical amplifier is used to receive the wave beam, and the output end of the second optical amplifier is connected to the third input port of the first optical splitter. The first optical splitter receives the wave beam amplified by the second optical amplifier through the third input port, splits the wave beam into multiple wave beams, and sends the multiple wave beams through the multiple third output ports.

[0019] The second optical amplifier will also generate out-of-band ASE noise when amplifying the downstream light beam, but since the out-of-band ASE noise will not be incorporated into the main signal of the power division network wavelength division system, it is not necessary to filter out the out-of-band ASE noise in the downstream light beam.

[0020] The technical solution provided by the present disclosure is that the input end of the second optical amplifier is used to connect to a wavelet port of the power division network wavelength division system, and the multiple third output ports of the first optical splitter are used to send the wavelet light beam to the outside. The expansion device can expand one wavelet port into multiple third output ports, thereby realizing the expansion of the wavelet light beam.

[0021] In a possible implementation, the wave expansion device further includes a first circuit board. The Twin WSS, the first optical amplifier, the second optical amplifier, and the first optical splitter are located on the first circuit board. The first circuit board is used to carry the Twin WSS, the first optical amplifier, the second optical amplifier, and the first optical splitter, and is used to power components that need power and transmit control signals.

[0022] In a possible implementation manner, the first circuit board is a printed circuit board (PCB).

[0023] In a second aspect, the present disclosure provides another wave expansion device. The wave expansion device includes a beam combiner, a third optical amplifier, a single wavelength selective switch (Single WSS) and a fourth optical amplifier, and the Single WSS includes a WSS and a second optical splitter. The beam combiner has a fourth input port and a fourth output port, and the fourth input port is multiple. The WSS has a fifth input port and a fifth output port. The input end of the third optical amplifier is connected to the fourth output port of the beam combiner, and the output end of the third optical amplifier is connected to the fifth input port of the WSS. The beam combiner receives multiple uplink beams through multiple fourth input ports, combines the multiple uplink beams into a combined beam, and sends the combined beam to the third optical amplifier through the fourth output port. The WSS receives the combined beam amplified by the third optical amplifier through the fifth input port, filters the combined beam, and sends the filtered combined beam through the fifth output port. The second optical splitter has a sixth input port and multiple sixth output ports. The input end of the fourth optical amplifier is used to receive the downlink beam, and the output end of the fourth optical amplifier is connected to the sixth input port of the second optical splitter. The second optical splitter receives the downstream light beam amplified by the fourth optical amplifier through the sixth input port, splits the downstream light beam into multiple downstream light beams, and sends the multiple downstream light beams through multiple sixth output ports.

[0024] Among them, the light beam incident from the fifth input port of the Single WSS is emitted from the fifth output port after passing through the WSS inside the Single WSS. The light beam incident from the sixth input port of the Single WSS is emitted from the sixth output port after passing through the second optical splitter inside the Single WSS. It can be seen that the Single WSS can perform programmable operations on the waveform of the light beam incident from the five input ports, but cannot perform programmable operations on the waveform of the light beam incident from the sixth input port.

[0025] The multiple fourth input ports of the beam combiner of the wave expansion device are respectively used to receive multiple uplink beams, and the fifth input port of the Single WSS of the wave expansion device is used to connect to an uplink port of the power division network wavelength division system. In this way, the wave expansion device can expand an uplink port into multiple fourth input ports. The input end of the fourth optical amplifier of the wave expansion device is used to connect to a downlink port of the power division network wavelength division system, and the multiple sixth output ports of the Single WSS of the wave expansion device are used to send downlink beams to the outside. In this way, the wave expansion device can expand a downlink port into multiple sixth output ports.

[0026] The third optical amplifier is used to amplify the combined light beam to compensate for the insertion loss of the added light beam. When the third optical amplifier amplifies the combined light beam, out-of-band ASE noise will be generated. If the out-of-band ASE noise is combined into the main signal of the power division network wavelength division system, it will affect the performance of the existing services of the power division network wavelength division system. Therefore, filtering the combined light beam in the present disclosure refers to filtering out the out-of-band ASE noise in the combined light beam.

[0027] The fourth optical amplifier is used to amplify the downstream optical beam to compensate for the insertion loss of the downstream optical beam. When the fourth optical amplifier amplifies the downstream optical beam, it will also generate out-of-band ASE noise. However, since the out-of-band ASE noise will not be integrated into the main signal of the power division network wavelength division system, it is not necessary to filter out the out-of-band ASE noise.

[0028] The technical solution provided by the present disclosure is that in the wave direction, the beam combiner receives multiple wave beams through multiple fourth input ports, combines the multiple wave beams into a combined beam, and sends the combined beam to the third optical amplifier through the fourth output port. The third optical amplifier amplifies the combined beam, and generates out-of-band ASE noise while amplifying. The combined beam carrying the out-of-band ASE noise is incident on the five input ports of the WSS of the Single WSS. The WSS filters out the out-of-band ASE noise carried in the combined beam, and sends the filtered combined beam to the wave port of the power division network wavelength division system through the fourth output port. It can be seen that by adopting the wave expansion device provided by the present disclosure, not only the expansion of the wave beam is achieved, but also the out-of-band ASE noise generated at the third optical amplifier can be avoided from being combined into the main signal of the power division network wavelength division system, thereby reducing the impact of the expanded wave beam on the performance of existing services of the power division network wavelength division system.

[0029] In the wave direction, the input end of the fourth optical amplifier receives a wave beam sent by the power division network wavelength division system, amplifies the wave beam, and sends the amplified wave beam to the sixth input port of the second optical splitter of the Single WSS. The second optical splitter splits the wave beam into multiple wave beams, and sends the multiple wave beams through multiple sixth output ports. It can be seen that by adopting the wave expansion device provided by the present disclosure, the expansion of the wave beam is also achieved.

[0030] In a third aspect, the present disclosure provides a wave expansion device. The wave expansion device includes a light combining component, a fifth optical amplifier and a WSS. The light combining component has a seventh input port and a seventh output port, and the seventh input port is multiple. The seventh output port of the light combining component is connected to the input end of the fifth optical amplifier, and the output end of the fifth optical amplifier is connected to the input port of the WSS. The light combining component receives multiple uplink light beams through multiple seventh input ports, combines the multiple uplink light beams into a combined light beam, and sends the combined light beam to the fifth optical amplifier. The WSS receives the combined light beam amplified by the fifth optical amplifier, filters the combined light beam, and sends the filtered combined light beam to the outside.

[0031] The light combining component is a beam combiner or WSS. The multiple seventh input ports of the light combining component are respectively used to receive multiple uplink beams, and the output port of the WSS of the wave expansion device is used to connect to an uplink port of the power division network wavelength division system. In this way, the wave expansion device can expand one uplink port into multiple seventh input ports.

[0032] The technical solution provided by the present disclosure is that, in the wave direction, the light combining component receives multiple wave beams through multiple seventh input ports, combines the multiple wave beams into a combined light beam, and sends the combined light beam to the fifth optical amplifier through the seventh output port. The fifth optical amplifier amplifies the combined light beam, and generates out-of-band ASE noise while amplifying. The combined light beam carrying the out-of-band ASE noise is incident on the WSS. The WSS filters out the out-of-band ASE noise carried in the combined light beam, and sends the filtered combined light beam to the wave port of the power division network wavelength division system. It can be seen that by adopting the wave expansion device provided by the present disclosure, not only the expansion of the wave beam is achieved, but also the out-of-band ASE noise generated at the fifth optical amplifier can be avoided from being combined into the main signal of the power division network wavelength division system, thereby reducing the impact of the expanded wave beam on the performance of existing services of the power division network wavelength division system.

[0033] In a possible implementation, the wave expansion device further includes a sixth optical amplifier and a splitter component. The input end of the sixth optical amplifier is used to receive the downstream light beam, and the output end of the sixth optical amplifier is connected to the input end of the splitter component. The splitter component receives the downstream light beam amplified by the sixth optical amplifier, splits the downstream light beam into multiple downstream light beams, and sends the multiple downstream light beams to the outside.

[0034] The optical splitting component is an optical splitter, a wavelength splitter or a WSS. The input end of the sixth optical amplifier of the wave expansion device is used to connect to a drop wave port of the wavelength division system of the power division network, and the multiple output ports of the optical splitting component of the wave expansion device are used to send the drop wave beams to the outside. In this way, the wave expansion device can expand a drop wave port into multiple output ports of the optical splitting component.

[0035] The technical solution provided by the present disclosure is that in the wave direction, the input end of the sixth optical amplifier receives a wave beam sent by the power division network wavelength division system, amplifies the wave beam, and sends the amplified wave beam to the splitter component. The splitter component splits the wave beam into multiple wave beams and sends the multiple wave beams to the outside. It can be seen that by adopting the wave expansion device provided by the present disclosure, the expansion of the wave beam is also achieved.

[0036] In a fourth aspect, the present disclosure provides an optical system. The optical system includes a power division network wavelength division system and a wave expansion device according to any one of the first aspects. The wave adding port of the power division network wavelength division system is connected to the second output port of the Twin WSS of the wave expansion device.

[0037] In a possible implementation, the wave dropping port of the wavelength division system of the power division network is connected to the input end of the second optical amplifier of the wave expansion device.

[0038] In a possible implementation, the power division network wavelength division system includes a main path optical splitter and a main path beam combiner, the main path beam combiner has an add-wave port, and the main path optical splitter has a drop-wave port.

[0039] In a fifth aspect, the present disclosure provides another optical system. The optical system includes a power division network wavelength division system and the wave expansion device of the second aspect. The uplink port of the power division network wavelength division system is connected to the fifth output port of the WSS of the wave expansion device. The downlink port of the power division network wavelength division system is connected to the input end of the fourth optical amplifier of the wave expansion device.

[0040] In a possible implementation, the power division network wavelength division system includes a main path optical splitter and a main path beam combiner, the main path beam combiner has an add-wave port, and the main path optical splitter has a drop-wave port.

[0041] In a sixth aspect, the present disclosure provides another optical system. The optical system comprises a power division network wavelength division system and a wave expansion device as described in any one of the third aspects. The wave adding port of the power division network wavelength division system is connected to the output port of the WSS of the wave expansion device.

[0042] In a possible implementation, the wave dropping port of the wavelength division system of the power division network is connected to the input end of the sixth optical amplifier of the wave expansion device.

[0043] In a possible implementation, the power division network wavelength division system includes a main path optical splitter and a main path beam combiner, the main path beam combiner has an add-wave port, and the main path optical splitter has a drop-wave port.

[0044] In a seventh aspect, the present disclosure provides a wave expansion method, which is applied to the wave expansion device described in any one of the first aspects. The wave expansion method includes: Twin WSS receives multiple wave beams through multiple first input ports, combines the multiple wave beams into a combined beam, and sends the combined beam to the first optical amplifier through the first output port. The first optical amplifier amplifies the combined beam and sends the amplified combined beam to the second input port of the Twin WSS. The Twin WSS receives the combined beam amplified by the first optical amplifier through the second input port, filters the combined beam, and sends the filtered combined beam through the second output port.

[0045] Among them, the above wave expansion method is used to expand the upper wave beam, and therefore, it can be called a method for expanding the upper wave beam.

[0046] In a possible implementation, the wave expansion method further includes a method for expanding a lower wave beam, and the method for expanding a lower wave beam includes: a second optical amplifier receives the lower wave beam, amplifies the lower wave beam, and sends the amplified lower wave beam to a first optical splitter. The first optical splitter receives the lower wave beam amplified by the second optical amplifier through a third input port, splits the lower wave beam into multiple lower wave beams, and sends the multiple lower wave beams through multiple third output ports.

[0047] In an eighth aspect, the present disclosure provides another wave expansion method, which is applied to the wave expansion device described in any one of the second aspects. The wave expansion method includes: the beam combiner receives multiple wave beams through multiple fourth input ports, combines the multiple wave beams into a combined beam, and sends the combined beam to the third optical amplifier through the fourth output port. The third optical amplifier amplifies the combined beam and sends the amplified combined beam to the fifth input port of the WSS of the Single WSS. The WSS receives the combined beam amplified by the third optical amplifier through the fifth input port, filters the combined beam, and sends the filtered combined beam through the fifth output port.

[0048] Among them, the above-mentioned wave expansion method is used to expand the upper wave beam, and therefore, it can be called a method for expanding the upper wave beam.

[0049] In a possible implementation, the wave expansion method also includes a method for expanding a lower wave beam, and the method for expanding a lower wave beam includes: a fourth optical amplifier receives the lower wave beam, amplifies the lower wave beam, and sends the amplified lower wave beam to a second optical splitter of the Single WSS. The second optical splitter receives the lower wave beam amplified by the fourth optical amplifier through a sixth input port, splits the lower wave beam into multiple lower wave beams, and sends the multiple lower wave beams through multiple sixth output ports. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1It is a schematic diagram of a power division network wavelength division system;

[0051] Figure 2 is a schematic diagram of an optical system including a wave expansion device in the related art;

[0052] Figure 3 is a schematic diagram of a first wave expansion device with Twin WSS provided in an embodiment of the present disclosure;

[0053] Figure 4 The embodiment of the present disclosure provides a method including a Figure 3 A schematic diagram of the optical system of the wave expansion device is shown;

[0054] Figure 5 is a schematic diagram of a second wave expansion device with Twin WSS provided in an embodiment of the present disclosure;

[0055] Figure 6 is a schematic diagram of a third wave expansion device with Twin WSS provided in an embodiment of the present disclosure;

[0056] Figure 7 The embodiment of the present disclosure provides a method including a Figure 6 A schematic diagram of the optical system of the wave expansion device is shown;

[0057] Figure 8 The embodiment of the present disclosure provides a method comprising two Figure 6 A schematic diagram of the optical system of the wave expansion device is shown;

[0058] Fig. 9 is a flow chart of a first method for expanding an upstream wave beam provided by an embodiment of the present disclosure;

[0059] Fig.10 is a flow chart of a first method for expanding a lower wave beam provided by an embodiment of the present disclosure;

[0060] Fig.11 is a schematic diagram of a first wave spreading device with Single WSS provided in an embodiment of the present disclosure;

[0061] Fig.12 The embodiment of the present disclosure provides a method including a Fig.11 A schematic diagram of the optical system of the wave expansion device is shown;

[0062] Fig.13 is a schematic diagram of a second wave spreading device with Single WSS provided in an embodiment of the present disclosure;

[0063] Fig.14 The embodiment of the present disclosure provides a method comprising two Fig.11 A schematic diagram of the optical system of the wave expansion device is shown;

[0064] Fig.15 is a flow chart of a second method for expanding an upper wave beam provided by an embodiment of the present disclosure;

[0065] Fig.16 is a flow chart of a second method for expanding a lower wave beam provided by an embodiment of the present disclosure;

[0066] Fig.17 It is a schematic diagram of a wave spreading device with WSS provided in an embodiment of the present disclosure.

[0067] Legend

[0068] 100, power division network wavelength division system, 101, wave add port, 102, wave drop port, 110, first main path optical splitter, 120, first main path beam combiner, 130, second main path optical splitter, 140, second main path beam combiner;

[0069] 200, a wave expansion device, 201, a light splitting component, 202, a light combining component, 203, a third optical amplifier, 204, a fourth optical amplifier;

[0070] 1. Twin WSS, 11. First input port, 12. First output port, 13. Second input port, 14. Second output port, 15. Output optical fiber;

[0071] 2. The first optical amplifier;

[0072] 3. The second optical amplifier;

[0073] 4. a first optical splitter, 41. a third input port, 42. a third output port;

[0074] 5. The first circuit board;

[0075] 6. beam combiner, 61. fourth input port, 62. fourth output port;

[0076] 7. The third optical amplifier;

[0077] 8. Single WSS, 81. WSS, 811. fifth input port, 812. fifth output port, 813. input optical fiber, 82. second optical splitter, 821. sixth input port, 822. sixth output port;

[0078] 9. Fourth optical amplifier;

[0079] 10. Second circuit board. DETAILED DESCRIPTION

[0080] At present, in order to reduce costs, a power division network wavelength division system based on a splitter (SPL) and a coupler (CPL) is used to replace the traditional optical add / drop multiplexer (OADM) for adding and dropping waves. Among them, the power division network wavelength division system is a type of OADM.

[0081] like Figure 1 , a schematic diagram of a power division network wavelength division system 100 is shown. The power division network wavelength division system 100 includes a first main path optical splitter 110, a first main path beam combiner 120, a second main path optical splitter 130, and a second main path beam combiner 140. In addition, optical amplifiers (OA) are also provided at the input ends of the first main path optical splitter 110 and the second main path optical splitter 130, and optical amplifiers are also provided at the output ends of the first main path beam combiner 120 and the second main path beam combiner 140.

[0082] The first main beam splitter 110 is used to receive an input light beam, split the input light beam into multiple light beams, send a part of the light beam to the first main beam combiner 120, and use the other part of the light beam as a drop-out light beam to be dropped through the drop-out port 102. The first main beam combiner 120 is used to receive the light beam sent by the first main beam splitter 110, and is used to receive the added light beam through the add-in port 101. The first main beam combiner 120 combines all the received light beams and sends the combined light beams to the outside.

[0083] The second main beam splitter 130 is used to receive an input light beam from another direction, split the input light beam into multiple light beams, send a part of the light beam to the second main beam combiner 140, and use the other part of the light beam as a drop-out light beam to be dropped through the drop-out port 102. The second main beam combiner 140 is used to receive the light beam sent by the second main beam splitter 130, and is used to receive the added light beam through the added port 101. The second main beam combiner 140 combines all the received light beams and sends the combined light beam to the outside.

[0084] It can be seen that the power division network wavelength division system 100 can receive an upstream light beam through the upstream port 101 and can send a downstream light beam through the downstream port 102, thereby realizing the functions of upstream and downstream.

[0085] As the business is constantly expanding, it is required that the add-in port 101 and the drop-in port 102 of the power division network wavelength division system 100 can be expanded. Figure 2 , which is a schematic diagram of a wave expansion device 200 in the related art. The wave expansion device 200 includes a light splitting component 201, a light combining component 202 and two optical amplifiers.

[0086] The optical splitter 201 and an optical amplifier are used to expand the drop-wave beam. The input end of the optical amplifier is used to connect to a drop-wave port 102 of the power division network wavelength division system 100, and receive the drop-wave beam sent by the drop-wave port 102. The optical amplifier amplifies the drop-wave beam and sends the amplified drop-wave beam to the optical splitter 201. The optical splitter 201 splits the drop-wave beam into multiple drop-wave beams and sends the multiple drop-wave beams to the outside. In this way, the expansion of the drop-wave beam is achieved, or it is called the expansion of the drop-wave port 102.

[0087] The light combining component 202 and another optical amplifier are used to expand the added wave beam. The light combining component 202 is used to receive multiple paths of added wave beams, combine the multiple paths of added wave beams into one combined wave beam, and send the combined wave beam to the optical amplifier. The optical amplifier receives the combined wave beam, amplifies the combined wave beam, and sends the amplified combined wave beam to an added wave port 101 of the power division network wavelength division system 100. In this way, the expansion of the added wave beam is achieved, or it is called the expansion of the added wave port 101.

[0088] The two optical amplifiers are used to amplify the downlink beam and the combined beam synthesized from multiple uplink beams, respectively, to compensate for the power insertion loss of the uplink beam and the downlink beam. However, when the optical amplifier amplifies the beam, out-of-band amplifier spontaneous emission (ASE) noise is generated. Once the combined beam carrying the out-of-band ASE noise is combined into the main signal of the power division network wavelength division system 100, it will affect the performance of the existing services.

[0089] For example, a combined light beam formed by combining multiple optical beams carries an optical signal with a wavelength of λ1, and when the optical amplifier amplifies the combined light beam, in addition to amplifying the optical signal with a wavelength of λ1, it also introduces an irrelevant signal with a wavelength of λ2 (i.e., out-of-band ASE noise). After the amplified combined light beam is combined into the main signal, the irrelevant signal with a wavelength of λ2 will be superimposed on the original optical signal with a wavelength of λ2 in the main signal, thereby affecting the performance of existing services of the power division network wavelength division system 100.

[0090] In view of the above technical problems, the embodiment of the present disclosure provides a wave expansion device 200, which can expand the added wave beam and filter out-of-band ASE noise in the added wave beam.

[0091] like Figure 3 and Figure 4As shown, the wavelength expansion device 200 includes a twin wavelength selective switch (Twin WSS) 1 and a first optical amplifier 2. The Twin WSS1 has a first input port 11, a first output port 12, a second input port 13, and a second output port 14, and the first input port 11 is multiple. The input end of the first optical amplifier 2 is connected to the first output port 12 of the Twin WSS1, and the output end of the first optical amplifier 2 is connected to the second input port 13 of the Twin WSS1. The Twin WSS1 receives multiple wavelength beams through the multiple first input ports 11, combines the multiple wavelength beams into a combined beam, and sends the combined beam to the first optical amplifier 2 through the first output port 12. The Twin WSS1 receives the combined beam amplified by the first optical amplifier 2 through the second input port 13, filters the combined beam, and sends the filtered combined beam through the second output port 14.

[0092] Among them, Figure 4 As shown, the multiple first input ports 11 of the wave expansion device 200 are the wave ports of the wave expansion device 200, and the multiple first input ports 11 are used to receive the wave beam. The second output port 14 of the wave expansion device 200 is used to connect with the wave port 101 of the power division network wavelength division system 100. In this way, the wave expansion device 200 can expand one wave port 101 of the power division network wavelength division system 100 into multiple first input ports 11, thereby realizing the expansion of the wave beam or wave port.

[0093] According to the technical solution provided by the embodiment of the present disclosure, Twin WSS1 receives multiple uplink beams through multiple first input ports 11, combines the multiple uplink beams into a combined beam, and sends the combined beam to the first optical amplifier 2. The first optical amplifier 2 amplifies the combined beam and generates out-of-band ASE noise at the same time. The first optical amplifier 2 sends the combined beam carrying the out-of-band ASE noise to the second input port 13 of Twin WSS1. Twin WSS1 filters out the out-of-band ASE noise in the combined beam, and sends the filtered combined beam to the added wave port 101 of the power division network wavelength division system 100. In this way, not only the expansion of the added wave beam is achieved, but also the out-of-band ASE noise of the added wave beam combined into the main signal is filtered out, so that the expanded added wave beam will not affect the performance of the existing services in the power division network wavelength division system 100.

[0094] Furthermore, it can be concluded from the above content that after Twin WSS1 combines multiple uplink beams into a combined beam and sends the combined beam through the first output port 12, the combined beam is not emitted externally. Instead, it is amplified by the first optical amplifier 2 and then looped back into Twin WSS1, and after being filtered out of out-of-band ASE noise by Twin WSS1, it is then emitted externally to the uplink port 101 of the power division network wavelength division system 100. That is, a Twin WSS1 completes the combination of multiple uplink beams and the filtering of the combined beam. In this way, the number of components included in the expansion device 200 is reduced, the integration density is improved, the fiber connection process is simplified, and the cost is reduced.

[0095] It should be noted that the Twin WSS in the related art includes four types of ports, namely, multiple upstream ports, common output ports (OUT ports) corresponding to the multiple upstream ports, multiple downstream ports, and common input ports (IN ports) corresponding to the multiple downstream ports. The method of using Twin WSS in the related art is that Twin WSS receives multiple upstream beams through multiple upstream ports, combines the multiple upstream beams into a combined beam, and outputs the combined beam through a common output port. Twin WSS receives downstream beams through a common input port, splits the downstream beams into multiple downstream beams, and sends the multiple downstream beams through multiple downstream ports. It can be seen that the Twin WSS in the related art is used to realize the splitting of one downstream beam, as well as the combining of multiple upstream beams, and can program the waveforms of both the downstream beam and the upstream beam.

[0096] The upper wave port, common output port, common input port and lower wave port of the Twin WSS in the related art are respectively equivalent to the first input port 11, the first output port 12, the second input port 13 and the second output port 14 of the Twin WSS1 provided in the embodiment of the present disclosure.

[0097] The method of using Twin WSS1 provided in the embodiment of the present disclosure is different from the method of using Twin WSS in the related art. When using Twin WSS1 provided in the embodiment of the present disclosure, Twin WSS1 receives multiple uplink beams through multiple first input ports 11, combines the multiple uplink beams into a combined beam, and sends the combined beam to the first optical amplifier 2 through the first output port 12. Different from the method of using Twin WSS in the related art, the beam amplified by the first optical amplifier 2 is not directly output to the outside, but loops back to enter the second input port 13 of Twin WSS1. Twin WSS1 receives the combined beam through the second input port 13, filters the combined beam, and then sends the filtered combined beam to the outside through the second output port 14. It can be seen that the Twin WSS1 provided in the embodiment of the present disclosure is used to realize the combination of multiple uplink beams and the filtering of the amplified combined beam, but is not used to process the downlink beam.

[0098] The embodiments of the present disclosure do not limit the specific structure of Twin WSS1. In some examples, Twin WSS1 adopts the existing structure of Twin WSS in the related art. In this case, the first input port 11 of Twin WSS1 in the embodiments of the present disclosure is an upstream port, the first output port 12 is a common output port, the second input port 13 is a common input port, and the second output port 14 is a downstream port. In addition, when in use, it is necessary to set Twin WSS1 to have only one downstream port to emit light, which is the second output port 14, while the other downstream ports do not emit light.

[0099] In addition, it can be seen from the above content that if the existing Twin WSS is fully reused, only one of the multiple drop ports is used, and the other drop ports exist but are idle. In order to reduce the waste of drop ports, in some examples, the optical output component corresponding to the second input port 13 of the Twin WSS1 only includes the second output port 14.

[0100] In other examples, in order to ensure that the retained wavelet port (second output port 14) is the wavelet port with the best optical performance among the multiple wavelet ports, the optical performance of the multiple wavelet ports can be tested before leaving the factory, and the wavelet port with the best optical performance can be retained, and the port components of the other wavelet ports can be removed, including only the output optical fiber 15.

[0101] In this way, Figure 5As shown, after leaving the factory, Twin WSS1 further includes one or more output optical fibers 15. The second output port 14 and the output optical fiber 15 are both optical output components corresponding to the second input port 13 of Twin WSS1. The optical performance of the optical signal output by the second output port 14 is better than (or not worse than) the optical performance of the optical signal output by the output optical fiber 15. The optical performance includes at least one of insertion loss and bandwidth.

[0102] It is understandable that the output optical fiber 15 is only used for testing before leaving the factory and has no effect after leaving the factory. Therefore, the output optical fiber 15 may be arranged not to be connected to the port component.

[0103] The above achieves the expansion of the upper wave beam. In order to expand the lower wave beam, in some examples, such as Figure 6 and Figure 7 As shown, the wave expansion device 200 also includes a second optical amplifier 3 and a first optical splitter 4. The first optical splitter 4 has a third input port 41 and a plurality of third output ports 42. The input end of the second optical amplifier 3 is used to receive the drop-down light beam, and the output end of the second optical amplifier 3 is connected to the third input port 41 of the first optical splitter 4. The first optical splitter 4 receives the drop-down light beam amplified by the second optical amplifier 3 through the third input port 41, splits the drop-down light beam into multiple drop-down light beams, and sends the multiple drop-down light beams through the multiple third output ports 42.

[0104] Among them, the second optical amplifier 3 and the first optical splitter 4 are used to realize the wave expansion. The input end of the second optical amplifier 3 is used to connect with the wave port 101 of the power division network wavelength division system 100. The second optical amplifier 3 receives a wave beam sent by the power division network wavelength division system 100, amplifies the wave beam, and sends the amplified wave beam to the first optical splitter 4. The first optical splitter 4 splits the wave beam into multiple wave beams, and sends the multiple wave beams through multiple third output ports 42. That is, the expansion device 200 can also expand an upstream port 101 of the power division network wavelength division system 100 into multiple third output ports 42.

[0105] It should be noted that although the second optical amplifier 3 still generates out-of-band ASE noise when amplifying the downstream beam, the downstream beam will not be combined with the main signal, so the out-of-band ASE noise will not affect the existing service performance. Therefore, it is not necessary to filter out the out-of-band ASE noise in the downstream beam.

[0106] In some examples, such as Figure 6As shown, the wave expansion device 200 further includes a first circuit board 5. The Twin WSS1, the first optical amplifier 2, the second optical amplifier 3 and the first optical splitter 4 are located on the first circuit board 5. The first circuit board 5 may be a printed circuit board (PCB), and the first circuit board 5 is used to carry the Twin WSS1, the first optical amplifier 2, the second optical amplifier 3 and the first optical splitter 4, and to power components that need power supply, and to transmit control signals.

[0107] In some examples, the wave expansion device 200 further includes a housing, and the Twin WSS1, the first optical amplifier 2, the second optical amplifier 3 and the first optical splitter 4 are located inside the housing.

[0108] The present disclosure also provides an optical system. Figure 4 , Figure 7 and Figure 8 As shown, the optical system includes a power division network wavelength division system 100 and the above-mentioned wavelength expansion device 200. The add-in port 101 of the power division network wavelength division system 100 is connected to the second output port 14 of the Twin WSS1 of the wavelength expansion device 200.

[0109] Twin WSS1 receives multiple uplink beams through multiple first input ports 11, combines the multiple uplink beams into a combined beam, and sends the combined beam to the first optical amplifier 2. The first optical amplifier 2 amplifies the combined beam and generates out-of-band ASE noise at the same time. The first optical amplifier 2 sends the combined beam carrying the out-of-band ASE noise to the second input port 13 of Twin WSS1. Twin WSS1 filters out the out-of-band ASE noise in the combined beam, and sends the filtered combined beam to the uplink port 101 of the power division network wavelength division system 100.

[0110] In some examples, such as Figure 4 , Figure 7 and Figure 8 As shown, the drop port 102 of the power division network wavelength division system 100 is connected to the input end of the second optical amplifier 3 of the wave expansion device 200. The second optical amplifier 3 receives a drop beam sent by the power division network wavelength division system 100, amplifies the drop beam, and sends the amplified drop beam to the first optical splitter 4. The first optical splitter 4 splits the drop beam into multiple drop beams, and sends the multiple drop beams through multiple third output ports 42.

[0111] In some examples, the power division network wavelength division system 100 includes a main optical splitter and a main beam combiner, the main beam combiner has an add-wave port 101 , and the main optical splitter has a drop-wave port 102 .

[0112] In some examples, such as Figure 4, Figure 7 and Figure 8 As shown, the power division network wavelength division system 100 includes a first main path optical splitter 110, a first main path beam combiner 120, a second main path optical splitter 130, and a second main path beam combiner 140. In addition, optical amplifiers are also provided at the input ends of the first main path optical splitter 110 and the second main path optical splitter 130, and optical amplifiers are also provided at the output ends of the first main path beam combiner 120 and the second main path beam combiner 140. Among them, the main path optical splitter includes the first main path optical splitter 110 and the second main path optical splitter 130. The main path beam combiner includes the first main path beam combiner 120 and the second main path beam combiner 140.

[0113] In some examples, such as Figure 4 and Figure 7 As shown, the wave expansion device 200 is used to expand the upstream port 101 of the first main path combiner 120 and the downstream port 102 of the second main path splitter 130 .

[0114] In some examples, such as Figure 8 As shown, the wave expansion device 200 is also used to expand the add-in port 101 of the second main path combiner 140 and the drop-in port 102 of the first main path splitter 110 .

[0115] The embodiment of the present disclosure also provides a wave expansion method, which is applied to the wave expansion device 200. The wave expansion method includes a method for expanding an upper wave beam and a method for expanding a lower wave beam.

[0116] like Fig. 9 As shown, the method for expanding an upper wave beam includes the following steps.

[0117] In step 901 , the Twin WSS1 receives multiple uplink beams through the multiple first input ports 11 , combines the multiple uplink beams into a combined beam, and sends the combined beam to the first optical amplifier 2 through the first output port 12 .

[0118] In step 902, the first optical amplifier 2 amplifies the combined light beam and sends the amplified combined light beam to the second input port 13 of the Twin WSS1.

[0119] In step 903 , the Twin WSS1 receives the combined light beam amplified by the first optical amplifier 2 through the second input port 13 , filters the combined light beam, and sends the filtered combined light beam through the second output port 14 .

[0120] like Fig.10 As shown, the method for expanding the down-wave beam includes the following steps.

[0121] In step 1001 , the second optical amplifier 3 receives the drop-down beam, amplifies the drop-down beam, and sends the amplified combined beam to the first optical splitter 4 .

[0122] In step 1002 , the first optical splitter 4 receives the drop-down beam amplified by the second optical amplifier 3 through the third input port 41 , splits the drop-down beam into multiple drop-down beams, and sends the multiple drop-down beams through multiple third output ports 42 .

[0123] For details about the wave spreading method, please refer to the relevant contents of the wave spreading device 200 mentioned above, which will not be described in detail here.

[0124] The present disclosure also provides another wave expansion device 200, such as Fig.11 As shown, the wave expansion device 200 no longer uses the Twin WSS 1, but uses a single wavelength selective switch (Single WSS) 8. Similar to the Twin WSS in the related art, the Single WSS in the related art also includes a plurality of add-in ports and a common output port (OUT port) corresponding to the plurality of add-in ports, and a plurality of drop-in ports and a common input port (IN port) corresponding to the plurality of drop-in ports.

[0125] However, it is different from Twin WSS in that, in Twin WSS, multiple up-wavelength beams input from multiple up-wavelength ports are output from a common output port after passing through WSS, and down-wavelength beams input from a common input port are also output from multiple down-wavelength ports after passing through WSS. That is, Twin WSS can perform programmable operations on the waveforms of both the up-wavelength beams and the down-wavelength beams. In SingleWSS, multiple up-wavelength beams input from multiple up-wavelength ports are output from a common port after passing through WSS, and down-wavelength beams input from a common input port are output from multiple down-wavelength ports after passing through a splitter. That is, Single WSS can only perform programmable operations on the waveforms of the up-wavelength beams, but cannot perform programmable operations on the waveforms of the down-wavelength beams.

[0126] Next, another wave expansion device 200 is exemplarily described.

[0127] like Fig.11 and Fig.12As shown, the wave expansion device 200 includes a beam combiner 6, a third optical amplifier 7, a Single WSS8 and a fourth optical amplifier 9, and the Single WSS8 includes a WSS81 and a second optical splitter 82. The beam combiner 6 has a fourth input port 61 and a fourth output port 62, and the fourth input port 61 is multiple. WSS81 has a fifth input port 811 and a fifth output port 812, the input end of the third optical amplifier 7 is connected to the fourth output port 62 of the beam combiner 6, and the output end of the third optical amplifier 7 is connected to the fifth input port 811 of WSS81. The second optical splitter 82 has a sixth input port 821 and multiple sixth output ports 822. The input end of the fourth optical amplifier 9 is used to receive the lower wave beam, and the output end of the fourth optical amplifier 9 is connected to the sixth input port 821 of the second optical splitter 82.

[0128] The beam combiner 6, the third optical amplifier 7 and the WSS 81 are used to achieve expansion of the uplink beam. The beam combiner 6 receives multiple uplink beams through multiple fourth input ports 61, combines the multiple uplink beams into a combined beam, and sends the combined beam to the third optical amplifier 7 through the fourth output port 62. The WSS 81 receives the combined beam amplified by the third optical amplifier 7 through the fifth input port 811, filters the combined beam, and sends the filtered combined beam through the fifth output port 812.

[0129] The fourth optical amplifier 9 and the second optical splitter 82 are used to achieve expansion of the downstream light beam. The fourth optical amplifier 9 receives the downstream light beam, amplifies the downstream light beam, and sends the amplified downstream light beam to the second optical splitter 82. The second optical splitter 82 receives the downstream light beam amplified by the fourth optical amplifier 9 through the sixth input port 821, splits the downstream light beam into multiple downstream light beams, and sends the multiple downstream light beams through multiple sixth output ports 822.

[0130] According to the technical solution provided by the embodiment of the present disclosure, in the wave adding direction, the beam combiner 6 receives multiple wave beams through multiple fourth input ports 61, combines the multiple wave beams into a combined beam, and sends the combined beam to the third optical amplifier 7 through the fourth output port 62. The third optical amplifier 7 amplifies the combined beam, and generates out-of-band ASE noise while amplifying. The combined beam carrying the out-of-band ASE noise is incident on the five input ports 811 of the WSS81 of the single WSS8. The WSS81 filters out the out-of-band ASE noise carried in the combined beam, and sends the filtered combined beam to the wave adding port 101 of the power division network wavelength division system 100 through the fourth output port 62. It can be seen that by adopting the wave expansion device 200 provided by the embodiment of the present disclosure, not only the expansion of the wave beam is achieved, but also the out-of-band ASE noise generated at the third optical amplifier 7 can be avoided from being combined into the main signal of the power division network wavelength division system, thereby reducing the influence of the expanded wave beam on the performance of the existing services of the power division network wavelength division system 100. The wave expansion device 200 can expand an add port 101 of the power division network wavelength division system 100 into a plurality of fourth input ports 61 .

[0131] In the wave direction, the input end of the fourth optical amplifier 9 receives a wave beam sent by the power division network wavelength division system 100, amplifies the wave beam, and sends the amplified wave beam to the sixth input port 821 of the second optical splitter 82 of the Single WSS8. The second optical splitter 82 splits the wave beam into multiple wave beams, and sends the multiple wave beams through multiple sixth output ports 822. It can be seen that by adopting the expansion device 200 provided in the embodiment of the present disclosure, the expansion of the wave beam is also achieved. The expansion device 200 can expand a wave port 102 of the power division network wavelength division system 100 into multiple sixth output ports 822.

[0132] It should be noted that the fifth input port 811, the fifth output port 812, the sixth input port 821 and the sixth output port 822 of the Single WSS8 provided in the embodiment of the present disclosure are respectively equivalent to the upstream port, common output port, common input port and downstream port of the Single WSS in the related art.

[0133] The specific structure of Single WSS8 provided in the embodiments of the present disclosure is not limited. In some examples, SingleWSS8 adopts the existing structure of Single WSS in the related art. In this case, the fifth input port 811 of SingleWSS8 in the embodiment of the present disclosure is an upstream port, the fifth output port 812 is a common output port, the sixth input port 821 is a common input port, and the multiple sixth output ports 822 are multiple downstream ports. In addition, when in use, only one upstream port (i.e., the fifth input port 811) is used, and the other upstream ports are idle.

[0134] It can be seen from the above that if the existing Single WSS is fully reused, only one of the multiple add-in ports is used, and the other add-in ports exist but are idle. In order to reduce the waste of add-in ports, in some examples, the optical input component corresponding to the fifth output port 812 of the Single WSS only includes the fifth input port 811.

[0135] In other examples, in order to ensure that when light is input from the fifth input port 811, the optical performance of the optical signal output from the fifth output port 812 is better than or not worse than when light is input from other add-on ports, the optical performance of the optical signal output from the fifth output port 812 when light is incident from different add-on ports can be tested before shipment, and the add-on port used when the optical performance is optimal is retained as the fifth input port 811, and the port components of other add-on ports are removed, leaving only the input optical fiber 813.

[0136] In this way, Fig.13 As shown, after leaving the factory, the Single WSS 8 further includes one or more input optical fibers 813. The fifth input port 811 and the input optical fiber 813 are both optical input components corresponding to the fifth output port 812 of the Single WSS 8. The input optical fiber 813 is not connected to the interface component.

[0137] In some examples, such as Fig.11 and Fig.13 As shown, the wave expansion device 20 also includes a second circuit board 10. The beam combiner 6, the third optical amplifier 7, the Single WSS 8 and the fourth optical amplifier 9 are located on the second circuit board 10. The second circuit board 10 may be a PCB. The second circuit board 10 is used to carry the beam combiner 6, the third optical amplifier 7, the Single WSS 8 and the fourth optical amplifier 9, and to power components that need power supply, and to transmit control signals.

[0138] In some examples, the wave expansion device 200 further includes a housing, and the beam combiner 6, the third optical amplifier 7, the Single WSS 8 and the fourth optical amplifier 9 are located inside the housing.

[0139] The present disclosure also provides another optical system. Fig.12 and Fig.14 As shown, the optical system includes a power division network wavelength division system 100 and the above-mentioned another wave expansion device 200. The uplink port 101 of the power division network wavelength division system 100 is connected to the fifth output port 812 of the WSS 81 of the wave expansion device 200. The downlink port 102 of the power division network wavelength division system 100 is connected to the input end of the fourth optical amplifier 9 of the wave expansion device 200.

[0140] like Fig.12 and Fig.14 As shown, in the wave adding direction, multiple wave beams are incident on the expansion device 200, and the beam combiner 6 of the wave expanding device 200 receives the multiple wave beams through multiple fourth input ports 61, combines the multiple wave beams into a combined beam, and sends the combined beam to the third optical amplifier 7 through the fourth output port 62. The third optical amplifier 7 amplifies the combined beam and sends the amplified combined beam to the fifth input port 811 of WSS81 in the Single WSS8. WSS81 receives the combined beam amplified by the third optical amplifier 7 through the fifth input port 811, and filters the combined beam, so that the out-of-band ASE noise generated at the third optical amplifier 7 can be filtered out. Afterwards, WSS81 sends the filtered combined beam to the wave adding port 101 of the power division network wavelength division system 100 through the fifth output port 812, so that the out-of-band ASE noise in the combined beam will not be combined into the main optical path, reducing the impact on the performance of the signal of the existing service.

[0141] like Fig.12 and Fig.14 As shown, in the drop direction, the fourth optical amplifier 9 receives the drop beam, amplifies the drop beam, and sends the amplified drop beam to the second optical splitter 82. The second optical splitter 82 receives the drop beam amplified by the fourth optical amplifier 9 through the sixth input port 821, splits the drop beam into multiple drop beams, and sends the multiple drop beams through multiple sixth output ports 822.

[0142] In some examples, the power division network wavelength division system 100 includes a main optical splitter and a main beam combiner, the main beam combiner has an add-wave port 101 , and the main optical splitter has a drop-wave port 102 .

[0143] In some examples, such as Fig.12 and Fig.14As shown, the power division network wavelength division system 100 includes a first main path optical splitter 110, a first main path beam combiner 120, a second main path optical splitter 130, and a second main path beam combiner 140. In addition, optical amplifiers are also provided at the input ends of the first main path optical splitter 110 and the second main path optical splitter 130, and optical amplifiers are also provided at the output ends of the first main path beam combiner 120 and the second main path beam combiner 140. Among them, the main path optical splitter includes the first main path optical splitter 110 and the second main path optical splitter 130. The main path beam combiner includes the first main path beam combiner 120 and the second main path beam combiner 140.

[0144] In some examples, such as Fig.12 As shown, the wave expansion device 200 is used to expand the upstream port 101 of the first main path combiner 120 and the downstream port 102 of the second main path splitter 130 .

[0145] In some examples, such as Fig.14 As shown, the wave expansion device 200 is also used to expand the add-in port 101 of the second main path combiner 140 and the drop-in port 102 of the first main path splitter 110 .

[0146] The embodiment of the present disclosure also provides a wave expansion method, which is applied to the second wave expansion device 200. The wave expansion method includes a method for expanding an upper wave beam and a method for expanding a lower wave beam.

[0147] like Fig.15 As shown, the method for expanding an upper wave beam includes the following steps.

[0148] In step 1501 , the beam combiner 6 receives multiple waveguide beams through the plurality of fourth input ports 61 , combines the multiple waveguide beams into a combined beam, and sends the combined beam to the third optical amplifier 7 through the fourth output port 62 .

[0149] In step 1502, the third optical amplifier 7 amplifies the combined light beam and sends the amplified combined light beam to the fifth input port of WSS81 of the Single WSS8.

[0150] In step 1503 , the WSS 81 receives the combined light beam amplified by the third optical amplifier 7 through the fifth input port 811 , filters the combined light beam, and sends the filtered combined light beam through the fifth output port 812 .

[0151] like Fig.16 As shown, the method for expanding the down-wave beam includes the following steps.

[0152] In step 1601 , the fourth optical amplifier 9 receives the downstream light beam, amplifies the downstream light beam, and sends the amplified downstream light beam to the second optical splitter 82 .

[0153] In step 1602 , the second optical splitter 82 receives the drop-down beam amplified by the fourth optical amplifier 9 through the sixth input port 821 , splits the drop-down beam into multiple drop-down beams, and sends the multiple drop-down beams through multiple sixth output ports 822 .

[0154] For details about the wave spreading method, please refer to the relevant contents of the wave spreading device 200 mentioned above, which will not be described in detail here.

[0155] The present disclosure also provides another wave expansion device 200. Fig.17 As shown, the expansion device 200 includes a light combining component 202, a fifth optical amplifier 203 and a WSS81. The light combining component 202 has a plurality of seventh input ports and a seventh output port. The seventh output port of the light combining component 202 is connected to the input end of the fifth optical amplifier 203, and the output end of the fifth optical amplifier 203 is connected to the input port of the WSS81. The light combining component 202 receives multiple wave beams through the plurality of seventh input ports, combines the multiple wave beams into a combined beam, and sends the combined beam to the fifth optical amplifier 203. The WSS81 receives the combined beam amplified by the fifth optical amplifier 203, filters the combined beam, and sends the filtered combined beam to the outside.

[0156] The light combining component 202 is a beam combiner or WSS. The multiple seventh input ports of the light combining component 202 are respectively used to receive multiple uplink beams, and the output port of the WSS81 of the wave expansion device 200 is used to connect to an uplink port 101 of the power division network wavelength division system 100. In this way, the wave expansion device 200 can expand one uplink port 101 into multiple seventh input ports.

[0157] According to the technical solution provided by the embodiment of the present disclosure, in the wave direction, the light combining component 202 receives multiple wave beams through multiple seventh input ports, combines the multiple wave beams into a combined beam, and sends the combined beam to the fifth optical amplifier 203 through the seventh output port. The fifth optical amplifier 203 amplifies the combined beam, and generates out-of-band ASE noise while amplifying. The combined beam carrying the out-of-band ASE noise is incident on WSS81. WSS81 filters out the out-of-band ASE noise carried in the combined beam, and sends the filtered combined beam to the wave port 101 of the power division network wavelength division system 100. It can be seen that by adopting the wave expansion device 200 provided by the embodiment of the present disclosure, not only the expansion of the wave beam is achieved, but also the out-of-band ASE noise generated at the fifth optical amplifier 203 can be avoided from being combined into the main signal of the power division network wavelength division system 100, thereby reducing the influence of the expanded wave beam on the performance of the existing services of the power division network wavelength division system 100.

[0158] In some examples, such as Fig.17As shown, the wave expansion device 200 further includes a sixth optical amplifier 204 and a light splitting component 201. The input end of the sixth optical amplifier 204 is used to receive the downstream light beam, and the output end of the sixth optical amplifier 204 is connected to the input end of the light splitting component 201. The light splitting component 201 receives the downstream light beam amplified by the sixth optical amplifier 204, splits the downstream light beam into multiple downstream light beams, and sends the multiple downstream light beams to the outside.

[0159] The optical splitter 201 is an optical splitter, a wavelength splitter or a WSS. The input end of the sixth optical amplifier 204 of the wave expansion device 200 is used to connect to a drop port 102 of the power division network wavelength division system 100, and the multiple output ports of the optical splitter 201 of the wave expansion device 200 are used to send drop beams to the outside. In this way, the wave expansion device 200 can expand a drop port 102 into multiple output ports of the optical splitter 201.

[0160] The technical solution provided by the embodiment of the present disclosure is that in the wave direction, the input end of the sixth optical amplifier 204 receives a wave beam sent by the power division network wavelength division system 100, amplifies the wave beam, and sends the amplified wave beam to the light splitting component 201. The light splitting component 201 splits the wave beam into multiple wave beams and sends the multiple wave beams to the outside. It can be seen that by adopting the wave expansion device 200 provided by the embodiment of the present disclosure, the expansion of the wave beam is also achieved.

[0161] In some examples, such as Fig.17 As shown, the wave expansion device 20 also includes a first circuit board. The light combining component 202, the fifth optical amplifier 203 and WSS81, the sixth optical amplifier 204 and the light splitting component 201 are located on the circuit board. The circuit board can be a PCB. The circuit board is used to power the components that need power supply and transmit control signals.

[0162] In some examples, the wave expansion device 200 further includes a housing, and the light combining component 202 , the fifth optical amplifier 203 and WSS81 , the sixth optical amplifier 204 and the light splitting component 201 are located inside the housing.

[0163] The present disclosure also provides an optical system. Fig.17 As shown, the optical system includes a power division network wavelength division system 100 and the above-mentioned wavelength expansion device 200. The add-in port 101 of the power division network wavelength division system 100 is connected to the output port of the WSS 81 of the wavelength expansion device 200.

[0164] In some examples, such as Fig.17 As shown, the drop port 102 of the power division network wavelength division system 100 is connected to the input end of the sixth optical amplifier 204 of the wave expansion device 200 .

[0165] In some examples, the power division network wavelength division system 100 includes a main optical splitter and a main beam combiner, the main beam combiner has an add-wave port 101 , and the main optical splitter has a drop-wave port 102 .

[0166] In some examples, such as Fig.17 As shown, the power division network wavelength division system 100 includes a first main path optical splitter 110, a first main path beam combiner 120, a second main path optical splitter 130, and a second main path beam combiner 140. In addition, optical amplifiers are also provided at the input ends of the first main path optical splitter 110 and the second main path optical splitter 130, and optical amplifiers are also provided at the output ends of the first main path beam combiner 120 and the second main path beam combiner 140. Among them, the main path optical splitter includes the first main path optical splitter 110 and the second main path optical splitter 130. The main path beam combiner includes the first main path beam combiner 120 and the second main path beam combiner 140.

[0167] In some examples, such as Fig.17 As shown, the wave expansion device 200 is used to expand the upstream port 101 of the first main path combiner 120 and the downstream port 102 of the second main path splitter 130 .

[0168] In some examples, the wave expansion device 200 is also used to expand the add-in port 101 of the second main-path combiner 140 and the drop-in port 102 of the first main-path splitter 110 .

[0169] The terms used in the embodiments of the present disclosure are only used to explain the embodiments of the present disclosure, and are not intended to limit the present disclosure. Unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present disclosure should be the common meanings understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure specification and claims do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, similar words such as "one" or "one" do not indicate a quantity limit, but indicate that there is at least one. Similar words such as "include" or "include" mean that the elements or objects appearing in front of "include" or "include" include the elements or objects listed after "include" or "include" and their equivalents, and do not exclude other elements or objects. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly. "Multiple" refers to two or more, unless otherwise clearly defined.

[0170] The above description is only an optional embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the principles of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A wave expansion device, characterized in that: The wave expansion device comprises a dual wavelength selective switch Twin WSS (1) and a first optical amplifier (2); The Twin WSS (1) has a first input port (11), a first output port (12), a second input port (13) and a second output port (14), wherein the first input port (11) is plural; The input end of the first optical amplifier (2) is connected to the first output port (12) of the Twin WSS (1), and the output end of the first optical amplifier (2) is connected to the second input port (13) of the Twin WSS (1); The Twin WSS (1) receives multiple waveguide light beams through the first input ports (11), combines the multiple waveguide light beams into a combined light beam, and sends the combined light beam to the first optical amplifier (2) through the first output port (12); receives the combined light beam amplified by the first optical amplifier (2) through the second input port (13), filters the combined light beam, and sends the filtered combined light beam through the second output port (14).

2. The wave expansion device according to claim 1, characterized in that: The Twin WSS (1) further comprises one or more output optical fibers (15), and the second output port (14) and the one or more output optical fibers (15) are both optical output components corresponding to the second input port (13) of the Twin WSS (1).

3. The wave expansion device according to claim 2, characterized in that: The optical performance of the optical signal output by the second output port (14) is not inferior to the optical performance of the optical signal output by the output optical fiber (15).

4. The wave expansion device according to claim 2 or 3, characterized in that: The output end of the output optical fiber (15) is not connected to the port component.

5. The wave expansion device according to claim 1, characterized in that: The optical output component corresponding to the second input port (13) of the Twin WSS (1) only includes the second output port (14).

6. The wave expansion device according to any one of claims 1 to 5, characterized in that: The wave expansion device also includes a second optical amplifier (3) and a first optical splitter (4); The first optical splitter (4) has a third input port (41) and a plurality of third output ports (42); The input end of the second optical amplifier (3) is used to receive the down-wavelength light beam, and the output end of the second optical amplifier (3) is connected to the third input port (41) of the first optical splitter (4); The first optical splitter (4) receives the downstream light beam amplified by the second optical amplifier (3) through the third input port (41), splits the downstream light beam into multiple downstream light beams, and sends the multiple downstream light beams through the multiple third output ports (42).

7. The wave expansion device according to claim 6, characterized in that: The wave expansion device further comprises a first circuit board (5), and the Twin WSS (1), the first optical amplifier (2), the second optical amplifier (3) and the first optical splitter (4) are located on the first circuit board (5).

8. An optical system, characterized in that: The optical system comprises a power division network wavelength division system (100) and a wave expansion device (200), wherein the wave expansion device (200) is a wave expansion device according to any one of claims 1 to 7; The wave adding port (101) of the power division network wavelength division system (100) is connected to the second output port (14) of the Twin WSS (1) of the wave expansion device (200).

9. The optical system according to claim 8, characterized in that The wave expansion device (200) is the wave expansion device as claimed in claim 6 or 7; The wave dropping port (102) of the power division network wavelength division system (100) is connected to the input end of the second optical amplifier (3) of the wave expansion device (200).

10. The optical system according to claim 8 or 9, characterized in that: The power division network wavelength division system comprises a main path optical splitter and a main path beam combiner, the main path beam combiner has the wave add port (101), and the main path optical splitter has the wave drop port (102).

11. A wave spreading method, characterized in that: The wave spreading method is applied to the wave spreading device according to any one of claims 1 to 7, and the wave spreading method comprises: The Twin WSS (1) receives multiple waveguide beams through multiple first input ports (11), combines the multiple waveguide beams into a combined beam, and sends the combined beam to the first optical amplifier (2) through a first output port (12); The first optical amplifier (2) amplifies the combined light beam and sends the amplified combined light beam to the second input port (13) of the Twin WSS (1); The Twin WSS (1) receives the combined light beam amplified by the first optical amplifier (2) through the second input port (13), filters the combined light beam, and sends the filtered combined light beam through the second output port (14).

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