CN112350779A - Wavelength division multiplexing device, fronthaul optical network device, system and operation method - Google Patents
Wavelength division multiplexing device, fronthaul optical network device, system and operation method Download PDFInfo
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- CN112350779A CN112350779A CN201910723725.6A CN201910723725A CN112350779A CN 112350779 A CN112350779 A CN 112350779A CN 201910723725 A CN201910723725 A CN 201910723725A CN 112350779 A CN112350779 A CN 112350779A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/40—Transceivers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
- H04B10/25752—Optical arrangements for wireless networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0201—Add-and-drop multiplexing
- H04J14/0202—Arrangements therefor
Abstract
The disclosure provides a wavelength division multiplexing device, a fronthaul optical network device, a system and an operation method, and relates to the technical field of optical networks. A wavelength division multiplexing device of the present disclosure includes: the circulator comprises three ports, the passing direction of optical signals in the circulator is from a first port to a second port, the second port is connected to a third port, and the second port is connected with a receiving and transmitting port of the wavelength division multiplexing device; and a single multiplexing-demultiplexing component, one side of which is connected with the second port of the circulator and the other side of which is a transmitting-receiving port of the WDM device. Such WDM devices can allow the same wavelength to be used for the input and output ports of the same optical transceiver, thereby reducing the number of wavelengths required and increasing system capacity.
Description
Technical Field
The present disclosure relates to the field of optical network technologies, and in particular, to a wavelength division multiplexing device, a fronthaul optical network apparatus, a system, and an operation method.
Background
Mobile communication is gradually entering the 5G era, and because the frequency spectrum of a 5G network is higher than the frequency band used by 4G, the coverage radius of the 5G network is smaller than that of the original 4G base station under the condition of the same edge rate. If the same coverage and similar edge rates are required, the number of 5G base stations is doubled compared to the number of 4G base stations for the same area. If the traditional technical scheme of point-to-point optical fiber direct connection is adopted, the quantity of optical cables used for 5G base station forward transmission is also doubled compared with the optical fiber cables used in 4G network networking, and great pressure is formed on optical fiber infrastructure resources in network networking construction and deployment.
When the 5G fronthaul links are connected in an optical fiber direct connection manner, a base station (in an S111 configuration manner) configured in a general standard requires 3 fronthaul links, and thus three optical fiber links are required. In the 4G era, a CWDM (Coarse Wavelength Division Multiplexer) Wavelength scheme is adopted, and a plurality of base station forward transmission links are converged into 1 trunk optical fiber in a multi-Wavelength fiber sharing manner. In the scheme, an optical module with a 10G rate based on CWDM Wavelength is adopted, each forward transmission link occupies a pair of CWDM Wavelength, and multiple wavelengths are routed (coupled/split) and transmitted in the same pair of trunk optical cables through a WDM (Wavelength Division Multiplexer).
The 5G base station needs an enhanced Common Radio Interface (eCPRI) Interface to have a 25G rate, and thus needs an optical module to provide the 25G rate.
Disclosure of Invention
It is an object of the present disclosure to increase the system capacity of a fronthaul optical network system.
According to an aspect of the present disclosure, there is provided a wavelength division multiplexing device including: a circulator, which includes three ports, wherein the passing direction of the optical signal in the circulator is from a first port to a second port, and from the second port to a third port, and the second port is connected to an interface in the direction of a transmitting/receiving port of a Wavelength Division Multiplexing (WDM) device; further comprising: one side of the single multiplexing-demultiplexing component is connected with the second ports of the circulators, and the other side of the single multiplexing-demultiplexing component is a transceiving port of the WDM device; or, the two multiplexing-demultiplexing components, wherein one side of the first multiplexing-demultiplexing component is connected with the output ports of the plurality of optical transceivers, the other side of the first multiplexing-demultiplexing component is connected with the first port of the circulator, and after one side of the second multiplexing-demultiplexing component is connected with the input ports of the plurality of optical transceivers, the other side of the second multiplexing-demultiplexing component is connected with the third port of the circulator.
In some embodiments, if the WDM device includes a single mux-demux assembly, the number of circulators matches the number of optical transceivers, the first port of the circulator is for interfacing with the output of the optical transceiver, and the third port is for interfacing with the input of the optical transceiver.
In some embodiments, if the WDM device includes two mux-demux assemblies, the number of circulators is 1, and the second port of the circulator is connected to the transceiving interface of the WDM device.
In some embodiments, if the WDM device includes a single mux-demux, the wavelength of the branch interface of the circulator-connected mux-demux coincides with or is within the same period as the wavelength of the circulator-connected optical transceiver.
In some embodiments, if the WDM device includes two mux-demux assemblies, the wavelength of each branch interface to which the mux-demux assemblies connect with the optical transceiver coincides with the wavelength of the corresponding optical transceiver or is within the same period.
The WDM device can allow the input and output ports of the same optical transceiver to adopt the same wavelength, thereby constructing a bidirectional fronthaul link by using a single wavelength, reducing the required number of wavelengths and improving the system capacity.
According to an aspect of further embodiments of the present disclosure, there is provided a fronthaul optical network device, including: the optical transceiver comprises a receiving unit and a transmitting unit, wherein the operating wavelengths of the receiving unit and the transmitting unit of the same optical transceiver are the same, and the operating wavelengths of different optical transceivers are different; and, any of the WDM devices mentioned hereinabove.
In some embodiments, if the WDM device includes a single mux-demux module, the first port and the third port of the circulator are connected to the transmitting unit and the receiving unit of the same optical transceiver, and the circulator corresponds to the optical transceiver one to one.
In some embodiments, the wavelength of the branch interface of the circulator-connected mux-demux assembly coincides with or is within the same period as the wavelength of the circulator-connected optical transceiver.
In some embodiments, if the WDM device includes two mux-demux assemblies, one side of the first mux-demux assembly is connected to the transmit unit of each optical transceiver and one side of the second mux-demux assembly is connected to the receive unit of each optical transceiver.
In some embodiments, the wavelength of each branch interface to which the mux-demux component connects to the optical transceiver coincides with or is within the same period of the wavelength of the corresponding optical transceiver.
In the fronthaul optical network device, the transmitting unit and the receiving unit of the same optical transceiver adopt the same working wavelength, so that a bidirectional fronthaul link is constructed by using a single wavelength, the number of required wavelengths is reduced, and the system capacity of the fronthaul optical network is improved.
According to an aspect of still other embodiments of the present disclosure, a fronthaul optical network system is provided, including: a plurality of fronthaul optical network devices, each fronthaul optical network device being any one of the fronthaul optical network devices mentioned above; the first-class fronthaul optical network device is located at a DU (Distributed Unit) side, and an optical transceiver of the first-class fronthaul optical network device is an optical transceiver at the DU side; the second type of front-end optical network device is positioned at the base station side, and an optical transceiver of the second type of front-end optical network device is an optical transceiver at the base station side; the receiving and transmitting ports of the first type of forward optical network device and the second type of forward optical network device are connected in a one-to-one correspondence mode through optical cables.
In such a fronthaul optical network system, the input/output ports of the same optical transceiver use the same wavelength, thereby reducing the number of required wavelengths and improving the system capacity of the fronthaul optical network.
According to an aspect of some embodiments of the present disclosure, a signal transmission method of a fronthaul optical network system is provided, including: a first port of a circulator of the fronthaul optical network device receives an optical signal from a transmitting unit of an optical transceiver and sends the optical signal to a multiplexing-demultiplexing component from a second port, wherein the circulator comprises three ports, and the passing direction of the optical signal in the circulator is from the first port to the second port to a third port; and the multiplexing-demultiplexing component combines and outputs the optical signals, wherein one side of the multiplexing-demultiplexing component is connected with the second ports of the plurality of circulators, and the other side of the multiplexing-demultiplexing component is a transceiving port of the fronthaul optical network device.
According to an aspect of some embodiments of the present disclosure, a signal transmission method of a fronthaul optical network system is provided, including: the optical signal transmitting method comprises the steps that a multiplexing-demultiplexing component of a fronthaul optical network device receives optical signals from a transmitting unit of an optical transceiver and outputs the optical signals to a first port of a circulator after the optical signals are combined, wherein the fronthaul optical network device comprises two multiplexing-demultiplexing components, one side of the first multiplexing-demultiplexing component is connected with output ports of the optical transceivers, the other side of the first multiplexing-demultiplexing component is connected with the first port of the circulator, one side of the second multiplexing-demultiplexing component is connected with input ports of the optical transceivers, and the other side of the second multiplexing-demultiplexing component is connected with a third port of the circulator; and the circulator outputs the optical signal from the second port, wherein the circulator comprises three ports, and the optical signal passes through the circulator from the first port to the second port to the third port.
According to an aspect of some embodiments of the present disclosure, there is provided a signal receiving method of a fronthaul optical network system, including: the optical signal is received by a multiplexing-demultiplexing component of the fronthaul optical network device, and is output to a second port of the circulator after being subjected to wave division, wherein one side of the multiplexing-demultiplexing component is connected with the second ports of the plurality of circulators, the other side of the multiplexing-demultiplexing component is a receiving and transmitting port of the fronthaul optical network device, the circulator comprises three ports, and the passing direction of the optical signal in the circulator is from the first port to the second port to the third port; the circulator outputs the optical signal to a receiving unit of the optical transceiver through the third port.
According to an aspect of some embodiments of the present disclosure, there is provided a signal receiving method of a fronthaul optical network system, including: after receiving the optical signal, a second port of a circulator of the fronthaul optical network device outputs the optical signal to a second multiplexing-demultiplexing component from a third port, wherein the fronthaul optical network device comprises the circulator and two multiplexing-demultiplexing components, a first port of the circulator is connected with the first multiplexing-demultiplexing component, a second port of the circulator is connected with a receiving and transmitting port of the fronthaul optical network device, and a third port of the circulator is connected with the second multiplexing-demultiplexing component; one side of the first multiplexing-demultiplexing component is connected with the output ports of the plurality of optical transceivers, the other side of the first multiplexing-demultiplexing component is connected with the third port of the circulator, one side of the second multiplexing-demultiplexing component is connected with the input ports of the plurality of optical transceivers, and the other side of the second multiplexing-demultiplexing component is connected with the third port of the circulator; the multiplexing-demultiplexing component receives the optical signal, and outputs the optical signal to the receiving unit of the optical transceiver connected with each output port after wave division.
According to an aspect of some embodiments of the present disclosure, there is provided a method for operating a fronthaul optical network system, including: the DU side forward-transmitting optical network device transmits the downlink signal by any one of the signal transmission methods; the base station side forward optical network device receives the downlink signal through any one of the signal receiving methods; the base station side front-end optical network device sends an uplink signal by any one of the signal sending methods; the DU side fronthaul optical network device receives the uplink signal through any one of the above signal receiving methods.
By the method, the same circulator can transmit the signal from the optical transceiver under the same working wavelength and transmit the received external optical signal to the signal input interface of the optical transceiver, so that the input and output ports of the same optical transceiver can be allowed to adopt the same wavelength, the required number of wavelengths is reduced, and the system capacity is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and not to limit the disclosure. In the drawings:
fig. 1 is a schematic diagram of some embodiments of a WDM device of the present disclosure.
Fig. 2 is a schematic diagram of further embodiments of a WDM device of the present disclosure.
Fig. 3 is a schematic diagram of some embodiments of a fronthaul optical network device of the present disclosure.
Fig. 4 is a flow chart of some embodiments of a signaling method of a fronthaul optical network system of the present disclosure.
Fig. 5 is a flowchart of some embodiments of a signal receiving method of a fronthaul optical network system according to the present disclosure.
Fig. 6 is a schematic diagram of further embodiments of a fronthaul optical network device according to the present disclosure.
Fig. 7 is a flowchart of further embodiments of a signal transmission method of a fronthaul optical network system according to the present disclosure.
Fig. 8 is a flowchart of another embodiment of a signal receiving method of a fronthaul optical network system according to the present disclosure.
Fig. 9 is a schematic diagram of some embodiments of a fronthaul optical network system of the present disclosure.
Detailed Description
The technical solution of the present disclosure is further described in detail by the accompanying drawings and examples.
In the related art, each fronthaul link occupies a pair of CWDM wavelengths, and since the industry chain can only provide CWDM optical modules with limited number of wavelengths, it is difficult to satisfy the requirement of multi-wavelength common-fiber transmission of multiple fronthaul links of base stations, and thus it is difficult to satisfy the requirement of a large number of increased base stations.
The WDM device disclosed by the invention replaces a WDM device which is simply composed of multiplexing-demultiplexing components (such as AWG (Arrayed Waveguide Grating) or thin film filter combination) in the related technology by the new combination design of a circulator and the multiplexing-demultiplexing components, effectively constructs a bidirectional fronthaul link by using a single wavelength in a network, and realizes the construction of a fronthaul link at the same wavelength, thereby reducing the number of wavelengths required in base station deployment, improving the utilization rate of the wavelengths and increasing the number of base stations which can be supported by optical cables.
The DU comprises a plurality of forward data interfaces, the base station also provides the forward data interfaces, and the forward data interfaces in the DU correspond to the forward data interfaces of the base station one by one, and a forward link is correspondingly constructed. The data interfaces on both sides (DU side and base station side) of each fronthaul link employ a fronthaul optical module, which includes a transmitter based on a standard Wavelength (which may be a Wavelength defined by CWDM, DWDM (Dense Wavelength Division Multiplexing), LAN-WDM, or other standards), and a receiver having the same Wavelength as the transmitter (or the receiver may extend the range, and employ a wide-spectrum receiver, and the Wavelength range capable of receiving signals covers all branch wavelengths provided by the WDM device).
The WDM device of the present disclosure includes a circulator and a multiplexing-demultiplexing component. The circulator comprises three ports, the passing direction of an optical signal in the circulator is from a first port to a second port, and from the second port to a third port, wherein the second port is connected with an interface in the direction of a transmitting and receiving port of the WDM device. The interface in the direction of the transmitting and receiving ports of the WDM device may be the transmitting and receiving ports of the WDM device itself, or may be an interface closer to the transmitting and receiving ports of the WDM device than the circulator in the WDM device. For example, the second port may be directly connected to the transceiving port of the WDM device, or may be connected to the transceiving port of the WDM device after passing through other structures, for example, after being connected to the multiplexing-demultiplexing component, the other side of the multiplexing-demultiplexing component is connected to the transceiving port of the WDM device. The multiplexing-demultiplexing component is a device for performing the wave combination and wave division of optical signals, can be AWG, and can also be constructed by adopting the combination of thin film filters.
A schematic diagram of some embodiments of the WDM device of the present disclosure is shown in fig. 1, and includes a circulator 1 and a multiplexing-demultiplexing assembly 2, where the circulator 1 includes three ports, and optical signals pass through the circulator from a first port B to a second port a to a third port C; the multiplexing-demultiplexing component 2 can perform multiplexing/demultiplexing (bidirectional) on different wavelengths, one side of the multiplexing-demultiplexing component 2 is connected with the second port a of the circulator, and the other side is a transceiving port of the WDM device. The first port B of the circulator is used for being connected with an output interface of an optical transceiver, and the third port C of the circulator is used for being connected with an input interface of the same optical transceiver.
When a first port B of the circulator receives optical signals from optical transceivers, the optical signals are led out to a multiplexing-demultiplexing component through a second port A, and the multiplexing-demultiplexing component combines the optical signals from the second ports of a plurality of optical transceivers or circulators, sends the optical signals out of a WDM device and sends the optical signals to ODN for transmission; when the WDM device receives the optical signal from the ODN, the multiplexing-demultiplexing module performs demultiplexing and sends the optical signal to each second port a or the input interface of the optical transceiver, and the second port a of the WDM device receives the optical signal and then leads the optical signal to the input interface of the optical transceiver from the third port C.
Because the circulator signal flow direction is set, the input end and the output end of the optical transceiver are not interfered with each other, so the input end and the output end of the optical transceiver connected with the same circulator can adopt the same working wavelength, the WDM device allows the input and the output ports of the same optical transceiver to adopt the same wavelength, the required wavelength quantity is reduced, and the system capacity is improved.
In some embodiments, the wavelength of the branch interface of the mux-demux connected to the circulator is the same as or in the same period as the wavelength of the optical transceiver connected to the circulator, so as to ensure that the input and output capabilities of the mux-demux are matched with those of the optical transceiver, thereby ensuring smooth transmission of optical signals.
Further embodiments of the WDM device of the present disclosure are schematically shown in fig. 2, and include a circulator 3 and two mux-demux modules, respectively, a first mux-demux module 4 for outputting signals from the optical transceiver to the outside, and a second mux-demux module 5 for transmitting received signals to the optical transceiver. The circulator 3 comprises three ports, and the optical signal passes through the circulator from the first port B to the second port A to the third port C. One side of the first multiplexing-demultiplexing component is connected with the output ports of the plurality of optical transceivers, and the other side of the first multiplexing-demultiplexing component is connected with a first port B of the circulator; one side of the second multiplexing-demultiplexing component is connected with the input ports of the plurality of optical transceivers, and the other side of the second multiplexing-demultiplexing component is connected with the third port C of the circulator.
An optical signal sent by the optical transceiver is sent to a first port B of the circulator after being multiplexed by the first multiplexing-demultiplexing component 4, sent out of the WDM device through a second port A and sent to the ODN for transmission; the optical signal from the ODN received by the second port a is sent to the second mux-demux module 5 through the third interface C, and is sent to each optical transceiver after being demultiplexed.
Because the signal flow direction of the circulator is set, the signals of the first multiplexing-demultiplexing component and the second multiplexing-demultiplexing component are not interfered with each other, and further the signals of the input end and the output end of each optical transceiver are not influenced with each other, so that the WDM device allows the input and the output ports of the same optical transceiver to adopt the same wavelength, reduces the required wavelength quantity and improves the system capacity.
In some embodiments, the wavelength of each branch interface connected between the mux-demux and the optical transceiver is in the same period after being consistent with the wavelength of the corresponding optical transceiver, so as to ensure that the input and output capabilities of the mux-demux are matched with those of the optical transceiver, and ensure smooth transmission of optical signals.
In some embodiments, a WDM device as shown in fig. 1 may be applied in a fronthaul optical network apparatus as shown in fig. 3.
The first port B of the circulator 1 is connected to a transmitting unit 6 of a CWDM optical transceiver (in the description, the CWDM optical transceiver is taken as an example, and may be another optical transceiver), and the third port C is connected to a receiving unit 7 of the CWDM optical transceiver. The optical modules of the transmitting unit 6 and the receiving unit 7 have the same operating wavelength. In some embodiments, the circulators are in one-to-one correspondence with the optical transceivers, and the number of the circulators is the same, so that the use amount of wavelengths is reduced to the maximum extent. In other embodiments, there may be an optical transceiver directly connected to the mux-demux. The optical transceiver which is not connected with the multiplexing-demultiplexing component through the circulator has different working wavelengths of the input interface and the output interface and different working wavelengths of other optical transceivers, so that the using amount of the wavelengths is reduced as much as possible under the condition that the number of the circulators is limited.
Based on the forward optical network device as shown in fig. 3, a flowchart of some embodiments of the signal transmission method of the fronthaul optical network system of the present disclosure is shown in fig. 4.
In step 401, the first port B of the circulator of the fronthaul optical network device receives an optical signal from the transmitting unit 6 of the optical transceiver and transmits the optical signal to the mux-demux module 2 from the second port a.
In step 402, the multiplexing-demultiplexing component 2 combines the optical signals and outputs the combined optical signals.
Based on the forward optical network device as shown in fig. 3, a flowchart of some embodiments of the signal receiving method of the fronthaul optical network system of the present disclosure is shown in fig. 5.
In step 501, the mux-demux receives an optical signal, and outputs the optical signal to the second port of the circulator after being demultiplexed.
In step 502, the circulator outputs the optical signal to the receiving unit 7 of the optical transceiver through the third port.
In such a fronthaul optical network device, the input/output ports of the same optical transceiver use the same wavelength without affecting each other, thereby reducing the number of required wavelengths and improving the system capacity of the fronthaul optical network.
Schematic diagrams of further embodiments of fronthaul optical network devices of the present disclosure are shown in fig. 6.
One side of the first multiplexing-demultiplexing component 4 is connected with the transmitting units 6 of a plurality of CWDM optical transceivers, and the working wavelength of each interface of the multiplexing-demultiplexing component is matched with the working wavelength of the connected optical transceiver; the other side of the first mux-demux 4 is connected to the first port B of the circulator 3.
One side of the second multiplexing-demultiplexing component 5 is connected with the receiving units 7 of a plurality of CWDM optical transceivers, and the working wavelength of each interface of the multiplexing-demultiplexing component is matched with the working wavelength of the connected optical transceiver; the other side of the second mux-demux 5 is connected to the third port C of the circulator 3.
The input interface and the output interface of the same CWDM optical transceiver have the same working wavelength.
Based on the forward optical network device shown in fig. 6, a flowchart of another embodiment of the signal transmission method of the fronthaul optical network system of the present disclosure is shown in fig. 7.
In step 701, the first mux-demux module 4 receives an optical signal from the transmitting unit 6 of the optical transceiver, and combines the optical signal and outputs the combined optical signal to the first port B of the circulator 3.
In step 702, the circulator 3 outputs an optical signal from the second port a.
Based on the forward optical network device shown in fig. 6, a flowchart of another embodiment of the signal receiving method of the fronthaul optical network system of the present disclosure is shown in fig. 8.
In step 801, after receiving the optical signal at the second port a of the circulator 3, the optical signal is output from the third port C to the second mux-demux module 5.
In step 802, the second mux-demux module 5 receives the optical signal, and outputs the optical signal after being demultiplexed to the receiving unit 7 of the optical transceiver connected to each output port.
In such a fronthaul optical network device, the input/output ports of the same optical transceiver use the same wavelength to affect each other, thereby reducing the number of required wavelengths and improving the system capacity of the fronthaul optical network.
The disclosure further provides a fronthaul optical network system, which includes a DU-side fronthaul optical network device and a base station-side fronthaul optical network device. The DU side fronthaul optical network device may be any one of the embodiments shown in fig. 3 or fig. 6, wherein the CWDM optical transceiver is an optical transceiver on the office side; the base station side fronthaul optical network device may also be any one of the embodiments shown in fig. 3 or fig. 6, where the CWDM optical transceiver is an optical transceiver on the base station side, and the DU side fronthaul optical network device are connected to the ODN through a trunk outlet of each WDM device, so as to achieve conduction of the uplink and downlink data transmission channels.
In some embodiments, as shown in fig. 9, 1270nm, 1290nm and 1310nm transmitters of the CWDM optical transceiver of the DU side fronthaul optical network device 91 are connected to the B port of the corresponding ring 1, ring 2, ring 3, etc., a receiver of the CWDM optical transceiver is connected to the C port of the WDM1 corresponding to the ring 1, ring 2, ring 3, etc., and a trunk outlet of the DU side fronthaul optical network device 91 is connected to the ODN;
the transmitter of the CWDM optical transceiver of the base station side fronthaul optical network device 92 is respectively connected to the B ports of the ring circulators such as ring 1, ring 2, ring 3, etc., the receiver of the CWDM optical transceiver is connected to the B ports of the corresponding ring circulators such as ring 1, ring 2, ring 3, etc., and the trunk outlet of the base station side fronthaul optical network device 92 is connected to the ODN.
The 1270nm optical transceiver transmits 25G fronthaul wavelength signals, the port B of the circulator of the DU-side fronthaul optical network device 91 receives the signals and then transmits the signals to the port A, and the signals are coupled by the multiplexing-demultiplexing component and then transmitted to the ODN; and the optical fiber enters a multiplexing-demultiplexing component of a forward optical network device 92 at the base station side from the ODN, is sent to an A port of a circulator, is then led out from a C port, and reaches a receiver of a 1270nm optical module for receiving and processing.
In some embodiments, the DU-side fronthaul optical network device may have a structure as in the embodiment shown in fig. 6, and transmit downlink data to the base station-side fronthaul optical network device by using the method in the embodiment shown in fig. 7, and receive uplink data from the base station-side fronthaul optical network device by using the method in the embodiment shown in fig. 8.
The base station side fronthaul optical network device may also have the structure in the embodiment shown in fig. 6, and send the uplink data to the DU side fronthaul optical network device by using the method in the embodiment shown in fig. 7, and receive the downlink data from the DU side fronthaul optical network device by using the method in the embodiment shown in fig. 8; the base station side fronthaul optical network device may also be configured as in the embodiment shown in fig. 3, and transmit the uplink data to the DU side fronthaul optical network device by using the method in the embodiment shown in fig. 4, and receive the downlink data from the DU side fronthaul optical network device by using the method in the embodiment shown in fig. 5.
In other embodiments, the DU-side fronthaul optical network device may have the structure shown in fig. 3 in the embodiment, where the method shown in fig. 4 is used to send downlink data to the base station-side fronthaul optical network device, and the method shown in fig. 5 is used to receive uplink data from the base station-side fronthaul optical network device.
The base station side fronthaul optical network device may also have the structure in the embodiment shown in fig. 3, and transmit the uplink data to the DU side fronthaul optical network device by using the method in the embodiment shown in fig. 4, and receive the downlink data from the DU side fronthaul optical network device by using the method in the embodiment shown in fig. 5. The base station side fronthaul optical network device may also be configured as in the embodiment shown in fig. 6, and transmit the uplink data to the DU side fronthaul optical network device by using the method in the embodiment shown in fig. 7, and receive the downlink data from the DU side fronthaul optical network device by using the method in the embodiment shown in fig. 8.
By matching the front-end optical network system with the operation method thereof, the same circulator can transmit the signals from the optical transceiver under the same working wavelength and transmit the received external optical signals to the signal input interface of the optical transceiver, so that the input and output ports of the same optical transceiver can be allowed to adopt the same working wavelength, the required number of wavelengths is reduced, and the system capacity is improved. The fronthaul optical network system does not need the same structure of the fronthaul optical network devices at the DU side and the base station side, thereby improving the flexibility of connection and configuration, reducing the assembly difficulty and being beneficial to popularization and application.
Finally, it should be noted that: the above examples are intended only to illustrate the technical solutions of the present disclosure and not to limit them; although the present disclosure has been described in detail with reference to preferred embodiments, those of ordinary skill in the art will understand that: modifications to the specific embodiments of the disclosure or equivalent substitutions for parts of the technical features may still be made; all such modifications are intended to be included within the scope of the claims of this disclosure without departing from the spirit thereof.
Claims (16)
1. A wavelength division multiplexing device comprising:
the circulator comprises three ports, the passing direction of optical signals in the circulator is from a first port to a second port, the second port is connected to a third port, and the second port is connected with an interface in the direction of a transmitting and receiving port of the wavelength division multiplexing WDM device;
further comprising:
a single multiplexing-demultiplexing component, one side of which is connected with the second ports of the plurality of circulators, and the other side of which is a transceiving port of the WDM device; or the like, or, alternatively,
the optical transceiver comprises two multiplexing-demultiplexing assemblies, wherein one side of the first multiplexing-demultiplexing assembly is used for being connected with a plurality of output ports of the optical transceiver, the other side of the first multiplexing-demultiplexing assembly is connected with a first port of the circulator, one side of the second multiplexing-demultiplexing assembly is used for being connected with a plurality of input ports of the optical transceiver, and the other side of the second multiplexing-demultiplexing assembly is connected with a third port of the circulator.
2. A WDM device according to claim 1 in which,
if the WDM device includes a single mux-demux module, the number of circulators matches the number of optical transceivers, a first port of the circulator is used for connecting to an output interface of the optical transceiver, and a third port is used for connecting to an input interface of the optical transceiver.
3. A WDM device according to claim 1 in which,
if the WDM device includes two multiplexing-demultiplexing components, the number of the circulators is 1, and the second port of the circulator is connected to the transceiving interface of the WDM device.
4. A WDM device according to claim 1 or 2 in which,
if the WDM device includes a single mux-demux component, the wavelength of the branch interface of the mux-demux component connected to the circulator is identical to or within the same period as the wavelength of the optical transceiver connected to the circulator.
5. A WDM device according to claim 1 or 3 in which,
if the WDM device includes two mux-demux components, the wavelength of each branch interface connected between the mux-demux component and the optical transceiver is consistent with the wavelength of the corresponding optical transceiver or in the same period.
6. A fronthaul optical network device, comprising:
the optical transceiver comprises a receiving unit and a transmitting unit, wherein the operating wavelengths of the receiving unit and the transmitting unit of the same optical transceiver are the same, and the operating wavelengths of different optical transceivers are different; and the combination of (a) and (b),
a wavelength division multiplexing WDM device as claimed in any one of claims 1 to 5.
7. The apparatus of claim 6, wherein if the WDM device includes a single mux-demux assembly, a first port and a third port of a circulator are connected to a transmitting unit and a receiving unit of the same optical transceiver, the circulator corresponding to the optical transceivers one-to-one.
8. The apparatus of claim 7, wherein,
the wavelength of the branch interface of the multiplexer-demultiplexer component connected with the circulator is consistent with the wavelength of the optical transceiver connected with the circulator or in the same period.
9. The apparatus of claim 6, wherein if the WDM device includes two mux-demux components, one side of a first mux-demux component is connected to a transmit unit of each optical transceiver and one side of a second mux-demux component is connected to a receive unit of each optical transceiver.
10. A WDM device according to claim 9 in which,
the wavelength of each branch interface connected with the optical transceiver by the multiplexing-demultiplexing component is consistent with the wavelength of the corresponding optical transceiver or in the same period.
11. A fronthaul optical network system, comprising:
a plurality of fronthaul optical network devices, wherein each fronthaul optical network device is the fronthaul optical network device of any one of claims 6 to 10;
the first-class fronthaul optical network device is positioned on a DU side of the distributed unit, and an optical transceiver of the first-class fronthaul optical network device is an optical transceiver on the DU side;
the second type of front-end optical network device is positioned at the base station side, and an optical transceiver of the second type of front-end optical network device is an optical transceiver at the base station side;
the receiving and transmitting ports of the first type of forward optical network device and the second type of forward optical network device are connected in a one-to-one correspondence manner through optical cable connection.
12. A method for transmitting a signal in a fronthaul optical network system, comprising:
a first port of a circulator of the fronthaul optical network device receives an optical signal from a transmitting unit of an optical transceiver and sends the optical signal to a multiplexing-demultiplexing component from a second port, wherein the circulator comprises three ports, the passing direction of the optical signal in the circulator is from the first port to the second port to a third port, and the third port is connected with a receiving unit of the optical transceiver;
and the multiplexing-demultiplexing component combines and outputs the optical signals, wherein one side of the multiplexing-demultiplexing component is connected with the second ports of the plurality of circulators, and the other side of the multiplexing-demultiplexing component is a transceiving port of the fronthaul optical network device.
13. A method for transmitting a signal in a fronthaul optical network system, comprising:
a first multiplexing-demultiplexing component of a fronthaul optical network device receives optical signals from a transmitting unit of an optical transceiver and outputs the optical signals to a first port of a circulator after the optical signals are combined, wherein the fronthaul optical network device comprises two multiplexing-demultiplexing components, one side of the first multiplexing-demultiplexing component is connected with output ports of the optical transceivers, the other side of the first multiplexing-demultiplexing component is connected with the first port of the circulator, one side of the second multiplexing-demultiplexing component is connected with input ports of the optical transceivers, and the other side of the second multiplexing-demultiplexing component is connected with a third port of the circulator;
the circulator outputs the optical signal from a second port, wherein the circulator comprises three ports, the passing direction of the optical signal in the circulator is from the first port to the second port to a third port, and the third port is connected with a receiving unit of an optical transceiver.
14. A signal receiving method of a fronthaul optical network system, comprising:
a multiplexing-demultiplexing component of the fronthaul optical network device receives an optical signal, and outputs the optical signal to a second port of a circulator after being subjected to wavelength division, wherein one side of the multiplexing-demultiplexing component is connected with the second ports of the plurality of circulators, the other side of the multiplexing-demultiplexing component is a receiving and transmitting port of the fronthaul optical network device, the circulator comprises three ports, the passing direction of the optical signal in the circulator is from a first port to a second port to a third port, and the first port is connected with a transmitting unit of an optical transceiver;
the circulator outputs the optical signal to a receiving unit of the optical transceiver through a third port.
15. A signal receiving method of a fronthaul optical network system, comprising:
after receiving the optical signal, a second port of a circulator of the fronthaul optical network device outputs the optical signal to a second multiplexing-demultiplexing component from a third port, wherein the fronthaul optical network device comprises the circulator and two multiplexing-demultiplexing components, a first port of the circulator is connected with the first multiplexing-demultiplexing component, a second port of the circulator is connected with a transceiving port of the fronthaul optical network device, and a third port of the circulator is connected with the second multiplexing-demultiplexing component; one side of the first multiplexing-demultiplexing component is connected with the output ports of the plurality of optical transceivers, the other side of the first multiplexing-demultiplexing component is connected with the third port of the circulator, one side of the second multiplexing-demultiplexing component is connected with the input ports of the plurality of optical transceivers, and the other side of the second multiplexing-demultiplexing component is connected with the third port of the circulator;
the multiplexing-demultiplexing component receives optical signals, and outputs the optical signals to receiving units of the optical transceivers connected with the output ports after wave division.
16. A method of operating a fronthaul optical network system, comprising:
the distributed unit DU side fronthaul optical network device transmits the downlink signal by the signal transmission method according to claim 12 or 13; the base station side fronthaul optical network device receives the downlink signal by the signal receiving method according to claim 14 or 15;
the base station side fronthaul optical network device transmits an uplink signal by the signal transmission method according to claim 12 or 13; the DU-side fronthaul optical network device receives the uplink signal by the signal receiving method according to claim 14 or 15.
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