CN113411696B - Data transmission system and method - Google Patents
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- CN113411696B CN113411696B CN202110957978.7A CN202110957978A CN113411696B CN 113411696 B CN113411696 B CN 113411696B CN 202110957978 A CN202110957978 A CN 202110957978A CN 113411696 B CN113411696 B CN 113411696B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
- H04J14/0242—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/2854—Wide area networks, e.g. public data networks
- H04L12/2856—Access arrangements, e.g. Internet access
- H04L12/2869—Operational details of access network equipments
- H04L12/2878—Access multiplexer, e.g. DSLAM
- H04L12/2879—Access multiplexer, e.g. DSLAM characterised by the network type on the uplink side, i.e. towards the service provider network
- H04L12/2885—Arrangements interfacing with optical systems
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Abstract
The invention discloses a data transmission system and a data transmission method. The system comprises: at least two sub-transmission systems, wherein; a first sub-transmission system of the at least two sub-transmission systems is a Passive Optical Network (PON) sub-transmission system; in the PON sub-transmission system, a multiplexing unit is arranged between an optical line terminal OLT and an optical network unit ONU; the multiplexing unit is used for coupling first data transmitted in the PON sub-transmission system and second data transmitted in other sub-transmission systems together for transmission; correspondingly, a demultiplexing unit corresponding to the multiplexing unit is arranged in the ONU; the demultiplexing unit is used for separating the first data from the second data and transmitting the first data to a first terminal; and transmitting the second data to a second terminal, wherein the other sub-transmission systems are sub-transmission systems except the first sub-transmission system in the at least two sub-transmission systems.
Description
Technical Field
The present invention relates to the field of data transmission technologies, and in particular, to a data transmission system and method.
Background
Currently, in audio/video data transmission, High Definition Multimedia Interface (HDMI) is widely focused because it is not necessary to compress audio/video data and can present High resolution audio/video signals, but in the case of transmitting audio/video data over a long distance, the conventional HDMI is expensive because it is not easy to distort signals, and thus the currently used HDMI is not suitable for transmitting audio/video data over a long distance.
Disclosure of Invention
Accordingly, the present invention is directed to a data transmission system and method, which can ensure long-distance transmission of high-quality audio/video data in advance of cost reduction.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
in a first aspect, the present invention provides a data transmission system, including: at least two sub-transmission systems, wherein;
a first sub-transmission system of the at least two sub-transmission systems is a Passive Optical Network (PON) sub-transmission system; in the PON sub-transmission system, a multiplexing unit is arranged between an optical line terminal OLT and an optical network unit ONU; the multiplexing unit is used for coupling first data transmitted in the PON sub-transmission system and second data transmitted in other sub-transmission systems together for transmission; correspondingly, a demultiplexing unit corresponding to the multiplexing unit is arranged in the ONU; the demultiplexing unit is used for separating the first data from the second data and transmitting the first data to a first terminal; and transmitting the second data to a second terminal, wherein the other sub-transmission systems are sub-transmission systems except the first sub-transmission system in the at least two sub-transmission systems.
In the above scheme, the multiplexing unit is configured to obtain a first optical signal carrying the first data from the OLT and obtain a second optical signal carrying the second data from a signal source in the other sub-transmission system; multiplexing the first optical signal and the second optical signal to obtain a first mixed optical signal; transmitting the first mixed optical signal to the ONU through an optical fiber in the first sub-transmission system;
in the ONU, the demultiplexing unit is configured to receive the first mixed optical signal, and perform demultiplexing on the first mixed optical signal to obtain the first optical signal and the second optical signal; transmitting the first optical signal to a first photoelectric conversion unit; transmitting the second optical signal to a second photoelectric conversion unit; the first photoelectric conversion unit is configured to perform first photoelectric conversion processing on the first optical signal to obtain a first electrical signal carrying the first data; transmitting the first electrical signal to the first terminal to complete transmission of the first data in the PON sub-transmission system; the second photoelectric conversion unit is configured to perform second photoelectric conversion processing on the second optical signal to obtain a second electrical signal carrying the second data; and transmitting the second electric signal to the second terminal to finish the transmission of the second data in the other sub-transmission systems.
In the above scheme, the first sub-transmission system includes a plurality of ONUs, and each ONU is provided with a demultiplexing unit corresponding to the multiplexing unit; the multiplexing unit is further configured to transmit the first mixed optical signal to an Optical Distribution Network (ODN) of the first sub-transmission system through an optical fiber in the first sub-transmission system, when the multiplexing unit is between the OLT and the ODN;
the ODN is used for equally distributing the first mixed optical signal to each ONU according to optical power;
and the demultiplexing unit in each ONU is used for demultiplexing the distributed mixed optical signals and transmitting the data carried in each demultiplexed single optical signal to a corresponding terminal.
In the above scheme, when the multiplexing unit is disposed between the ODN and the ONU, the multiplexing unit is further configured to obtain a third optical signal carrying first data from the ODN and obtain a second optical signal from a signal source in the other sub-transmission system, and multiplex the third optical signal and the second optical signal to obtain a second mixed optical signal; transmitting the second mixed optical signal to the ONU through an optical fiber in the first sub-transmission system;
in the ONU, the demultiplexing unit is configured to receive the second mixed optical signal, perform demultiplexing on the second mixed optical signal to obtain a third optical signal and the second optical signal, and transmit the third optical signal to a first optical-to-electrical conversion unit; transmitting the second optical signal to a second photoelectric conversion unit;
the first photoelectric conversion unit is configured to receive the third optical signal, perform third photoelectric conversion processing on the third optical signal to obtain a third electrical signal carrying the first data, and transmit the third electrical signal to the first terminal to complete transmission of the first data in the PON sub-transmission system;
the second optical-to-electrical conversion unit is configured to receive the second optical signal, perform fourth optical-to-electrical conversion processing on the second optical signal, obtain a fourth electrical signal carrying the second data, and transmit the fourth electrical signal to the second terminal to complete transmission of the second data in the other sub-transmission systems, where the ONU is one or more of the ONUs.
In the above scheme, in the case that the other sub-transmission systems are audio-video sub-transmission systems, the second data is audio-video data; and the second terminal is connected with the ONU by adopting a high-definition multimedia interface (HDMI) and is used for outputting high-definition video and/or audio based on the audio-video data.
In the above scheme, the HDMI is an optical fiber HDMI or a copper core HDMI.
In the above scheme, the PON sub-transmission system is one of: ethernet Passive Optical Networks (EPONs), Gigabit-capable Passive Optical Networks (GPONs), 10 GEPONs, 10G Passive Optical Networks (XG-PONs, 10 Gigabit-capable Passive Optical Networks), and 10G Symmetric Passive Optical Networks (XGs-PONs, 10 Gigabit-capable Symmetric Passive Optical Networks).
In the above scheme, the wavelength of the second optical signal is 1550 nm.
In a second aspect, the present invention further provides a data transmission method, which is applied to a data transmission system, where the system includes: the first sub-transmission system of the at least two sub-transmission systems is a Passive Optical Network (PON) sub-transmission system; in the PON sub-transmission system, a multiplexing unit is arranged between an optical line terminal OLT and an optical network unit ONU; correspondingly, a demultiplexing unit corresponding to the multiplexing unit is arranged in the ONU; the method comprises the following steps:
the multiplexing unit couples first data transmitted in the PON sub-transmission system with second data transmitted in other sub-transmission systems for transmission;
the demultiplexing unit separates the first data from the second data and transmits the first data to a first terminal; transmitting the second data to a second terminal;
wherein the other sub-transmission systems are sub-transmission systems except the first sub-transmission system in the at least two sub-transmission systems.
In the above aspect, the method further includes:
the multiplexing unit obtains a first optical signal carrying the first data from the OLT and obtains a second optical signal carrying the second data from signal sources in the other sub-transmission systems; multiplexing the first optical signal and the second optical signal to obtain a first mixed optical signal; transmitting the first mixed optical signal to the ONU through an optical fiber in the first sub-transmission system;
in the ONU, the demultiplexing unit receives the first mixed optical signal and performs demultiplexing on the first mixed optical signal to obtain the first optical signal and the second optical signal; transmitting the first optical signal to a first photoelectric conversion unit; transmitting the second optical signal to a second photoelectric conversion unit; the first photoelectric conversion unit performs first photoelectric conversion processing on the first optical signal to obtain a first electric signal carrying the first data; transmitting the first electrical signal to the first terminal to complete transmission of the first data in the PON sub-transmission system; the second photoelectric conversion unit performs second photoelectric conversion processing on the second optical signal to obtain a second electrical signal carrying the second data; and transmitting the second electric signal to the second terminal to finish the transmission of the second data in the other sub-transmission systems.
In the above scheme, the first sub-transmission system includes a plurality of ONUs, and each ONU is provided with a demultiplexing unit corresponding to the multiplexing unit; when the multiplexing unit is located between the OLT and an Optical Distribution Network (ODN) of the first sub-transmission system, the multiplexing unit transmits the first mixed optical signal to the ODN through an optical fiber in the first sub-transmission system;
the ODN equally divides the first mixed optical signal to each ONU according to optical power;
and the demultiplexing unit in each ONU performs demultiplexing processing on the distributed mixed optical signals and transmits data carried in each demultiplexed single optical signal to a corresponding terminal.
In the above scheme, when the multiplexing unit is disposed between the ODN and the ONU, the multiplexing unit obtains a third optical signal carrying first data from the ODN and a second optical signal from a signal source in the other sub-transmission system, and performs multiplexing processing on the third optical signal and the second optical signal to obtain a second mixed optical signal; transmitting the second mixed optical signal to the ONU through an optical fiber in the first sub-transmission system;
in the ONU, the demultiplexing unit receives the second mixed optical signal, performs demultiplexing on the second mixed optical signal to obtain a third optical signal and the second optical signal, and transmits the third optical signal to the first optical-to-electrical conversion unit; transmitting the second optical signal to a second photoelectric conversion unit; the first photoelectric conversion unit receives the third optical signal, performs third photoelectric conversion processing on the third optical signal to obtain a third electrical signal carrying the first data, and transmits the third electrical signal to the first terminal to complete transmission of the first data in the PON sub-transmission system; and the second photoelectric conversion unit receives the second optical signal, performs fourth photoelectric conversion processing on the second optical signal to obtain a fourth electric signal carrying the second data, and transmits the fourth electric signal to the second terminal to complete transmission of the second data in the other sub-transmission systems, wherein the ONU is one or more of the ONUs.
The embodiment of the invention provides a data transmission system and a data transmission method. Wherein the system comprises: at least two sub-transmission systems, wherein; a first sub-transmission system of the at least two sub-transmission systems is a Passive Optical Network (PON) sub-transmission system; in the PON sub-transmission system, a multiplexing unit is arranged between an optical line terminal OLT and an optical network unit ONU; the multiplexing unit is used for coupling first data transmitted in the PON sub-transmission system and second data transmitted in other sub-transmission systems together for transmission; correspondingly, a demultiplexing unit corresponding to the multiplexing unit is arranged in the ONU; the demultiplexing unit is used for separating the first data from the second data and transmitting the first data to a first terminal; and transmitting the second data to a second terminal, wherein the other sub-transmission systems are sub-transmission systems except the first sub-transmission system in the at least two sub-transmission systems. According to the system and the method provided by the embodiment of the invention, the second data is coupled to the PON sub-transmission system and transmitted together with the first data, and the optical fiber is used as a transmission medium, so that the attenuation of long-distance optical signal transmission is basically negligible, the long-distance transmission of the second data can be realized, and the high-quality data transmission can be ensured. In addition, because the system and the method couple the data of other sub-transmission systems in the original passive optical network, the original passive network system is not required to be transformed in a large quantity, and rewiring is not required, so that the cost is reduced, and the system and the method can be suitable for the existing PON networks of various hospitals, schools and the like.
Drawings
Fig. 1 is a schematic structural diagram of a data transmission system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a PON sub-transmission system according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an ONU according to an embodiment of the present invention;
FIG. 4 is a diagram illustrating a transmission process of audio/video data according to the related art;
fig. 5 is a schematic diagram of a transmission process of first data in the PON sub-transmission system according to the embodiment of the present invention;
fig. 6 is a schematic structural diagram of a coupled transmission of audio/video data and first data in a PON sub-transmission system according to an embodiment of the present invention;
fig. 7 is a flowchart illustrating a data transmission method according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe specific technical solutions of the present invention with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. The embodiments and features of the embodiments of the present invention may be arbitrarily combined with each other without conflict. The steps illustrated in the flow chart of the figure are performed in a computer system such as a set of computer executable instructions. Also, while a logical order is shown in the flow diagrams, in some cases, the steps shown or described may be performed in an order different than here.
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a schematic structural diagram of a data transmission system according to an embodiment of the present invention. As shown in fig. 1, the system 10 includes: at least two sub-transmission systems 101, wherein;
a first sub-transmission system 1011 of the at least two sub-transmission systems is a Passive Optical Network (PON) sub-transmission system; in the PON sub-transmission system, a multiplexing unit is arranged between an optical line terminal OLT and an optical network unit ONU; the multiplexing unit is configured to couple first data transmitted in the PON sub-transmission system with second data transmitted in another sub-transmission system 1012 for transmission; correspondingly, a demultiplexing unit corresponding to the multiplexing unit is arranged in the ONU; the demultiplexing unit is used for separating the first data from the second data and transmitting the first data to a first terminal; and transmitting the second data to a second terminal, wherein the other sub-transmission systems are sub-transmission systems except the first sub-transmission system in the at least two sub-transmission systems.
It should be noted that, in an embodiment of the present invention, a data transmission system includes at least two sub-transmission systems, where a first sub-transmission system is a Passive Optical Network (PON) sub-transmission system, and a multiplexing Unit is disposed between an Optical Line Terminal (OLT) and an Optical Network Unit (ONU) in the PON sub-transmission system, where the multiplexing Unit may be an Optical Multiplexing Unit (OMU), and may refer to an Optical transmission device or apparatus that combines multiple wavelength Optical signals into a multiple wavelength Optical signal, which may also be referred to as a combiner. In practical application, two or more optical signals with different wavelengths (carrying various information) may be coupled to the same optical fiber in the Multiplexing unit in a Wavelength Division Multiplexing (WDM) mode for transmission. Namely: the multiplexing unit is used for coupling first data transmitted in the PON sub-transmission system and second data transmitted in other sub-transmission systems together for transmission; the other sub transmission system may be a sub transmission system other than the first sub transmission system among the at least two sub transmission systems. Correspondingly, a Demultiplexing Unit is disposed in an ONU in the PON sub-transmission system, where the Demultiplexing Unit may be an Optical Demultiplexing Unit (ODU), and may refer to an Optical transmission device or apparatus that decomposes a multi-wavelength Optical signal into a plurality of single-wavelength Optical signals, which may also be referred to as a demultiplexer. In practical application, the demultiplexing unit may adopt a Wavelength Division Multiplexing (PWDM) form to divide the optical signals coupled together for transmission into optical signals of each single Wavelength, that is: the demultiplexing unit is configured to separate the first data from the second data, and then transmit the separated first data and second data to respective corresponding terminals. And finally, the transmission of each data (information) is completed. Therefore, other data can be transmitted in the existing PON sub-transmission system, the attenuation of long-distance signal transmission is basically negligible due to the fact that the optical fiber serves as a transmission medium, long-distance transmission of second data can be achieved, and high-quality data transmission can be guaranteed. In addition, because the system and the method couple the data of other sub-transmission systems in the original passive optical network, the original passive network system is not required to be transformed in a large quantity, and rewiring is not required, so that the cost is reduced, and the system and the method can be suitable for the existing PON networks of various hospitals, schools and the like.
Here, the first sub transmission system, the first data, the second data, the first terminal, and the second terminal are described only for convenience in describing different devices in the same procedure, and are not intended to limit the present invention. The types of the first terminal and the second terminal may be the same or different, including but not limited to: electronic equipment such as mobile phones, computers, players and the like.
In some embodiments, the multiplexing unit is configured to obtain a first optical signal carrying the first data from the OLT and obtain a second optical signal carrying the second data from a signal source in the other sub-transmission system; multiplexing the first optical signal and the second optical signal to obtain a first mixed optical signal; transmitting the first mixed optical signal to the ONU through an optical fiber in the first sub-transmission system;
in the ONU, the demultiplexing unit is configured to receive the first mixed optical signal, and perform demultiplexing on the first mixed optical signal to obtain the first optical signal and the second optical signal; transmitting the first optical signal to a first photoelectric conversion unit; transmitting the second optical signal to a second photoelectric conversion unit; the first photoelectric conversion unit is configured to perform first photoelectric conversion processing on the first optical signal to obtain a first electrical signal carrying the first data; transmitting the first electrical signal to the first terminal to complete transmission of the first data in the PON sub-transmission system; the second photoelectric conversion unit is configured to perform second photoelectric conversion processing on the second optical signal to obtain a second electrical signal carrying the second data; and transmitting the second electric signal to the second terminal to finish the transmission of the second data in the other sub-transmission systems.
It should be noted that the first data may be service data sent by the OLT to an ONU, where the service data is related to a service provisioned on the ONU, for example, if web Surfing (Internet Surfing) is provisioned on the ONU, the service data may be data related to Internet Surfing; for another example, if Voice over Internet Protocol (VoIP) is enabled on the ONU, the service network data may be data related to network Voice. It should be understood that the signal source should include components for converting an electrical signal into an optical signal, so that the second optical signal carrying the second data can be obtained. The second data is related to the type of the other sub-transmission system, for example, in some embodiments, in the case that the other sub-transmission system is a video and audio sub-transmission system, the second data may be video and audio data; the audio and video data are audio data and/or video data; the second terminal and the ONU can be connected by adopting HDMI and is used for outputting high-definition video and/or audio based on the video and audio data. Wherein, in some embodiments, the HDMI is a fiber HDMI or a copper core HDMI. The optical fiber HDMI is preferably selected generally, the raw material of the optical fiber HDMI is quartz, metal materials can be saved, reasonable use of resources is facilitated, the optical fiber transmission line diameter is superfine, the weight is light, and compared with the copper core HDMI with the same length, the weight can be reduced by 60%. In the aspect of audio/video data transmission, a transmission line formed by the optical fiber HDMI is completely free from external electromagnetic interference, and lossless transmission can be really realized, so that high fidelity of signals is ensured, particularly, the optical fiber HDMI line has ultralow background noise and ultrahigh signal-to-noise ratio and ensures extremely pure sound. In addition, for High-Fidelity (HI-FI) occasions, projector systems and video monitoring systems, HDMI long-distance transmission signals of the traditional copper cables are easy to distort, and a repeater is required to be added, which directly results in the unavailability or worse experience of the terminal. And because the optical fiber HDMI high-definition line adopts an optical fiber transmission medium, the attenuation of long-distance signal transmission can be basically ignored, the relay distance is long, the longest transmission distance can reach 300m, the arrangement position of a terminal is not needed to be considered, no matter where the terminal is arranged, the attenuation or distortion of the transmission signal is not needed to be worried about, and the terminal in the system can be arranged at will according to the actual use requirements of users.
In an actual application process, the PON sub-transmission system may be one of the following: EPON, GPON, 10GEPON, XG-PON, and XGS-PON. That is, the present invention can be applied to various PON systems. The wavelength of the first optical signal may be different in different passive optical networks, for example, in some embodiments, in the case that the PON sub-transmission system is an EPON or a GPON, the wavelength of the first optical signal may be 1490 nanometers. For another example, in other embodiments, the PON sub-transmission system is one of: in the case of 10GEPON, XG-PON and XGs-PON, the wavelength of the first optical signal may be 1577 nanometers.
In practical applications, the wavelength of the second optical signal may be 1550 nm. Said second data can be guaranteed to be transmitted to said second terminal under an optical signal having a wavelength of 1550 nm. It should be understood that, in the PON sub-transmission system, the maximum distance over which the second optical signal can be transmitted cannot be smaller than the distance over which the first optical signal can be transmitted in the PON sub-transmission system, otherwise, the second optical signal cannot be transmitted to the second terminal. Here, the first optical signal having a wavelength of 1490 nm is a wavelength of downstream transmission of the PON sub-transmission system. The wavelength of its upstream transmission may be 1310 nm.
Since an Optical Distribution Network (ODN) may be further included between The OLT and The ONUs in The PON sub-transmission system, for example, in an Optical Fiber To The Room (FTTR) system in fig. 2, The system includes at least one OLT, at least one ODN, and n ONUs, where n is a positive integer. Some of the n ONUs may be disposed in different rooms of the same user home, for example, m rooms of the user home 1, and one ONU is disposed in each room, and the FTTR system may meet the current mainstream home entertainment and interconnection requirements, and simultaneously brings high bandwidth and large capacity support capability of an optical fiber channel, for example, requirements of home Virtual Reality (VR) entertainment, high speed internet of things, real-time network experience, and the like. It should be noted that m is not greater than n.
On the basis, different transmission modes are generated where the multiplexing unit between the OLT and the ONU is arranged in the PON sub-transmission system.
In some embodiments, a plurality of ONUs are included in the first sub-transmission system, and each ONU is provided with a demultiplexing unit corresponding to the multiplexing unit; the multiplexing unit is further configured to transmit the first mixed optical signal to an Optical Distribution Network (ODN) of the first sub-transmission system through an optical fiber in the first sub-transmission system, when the multiplexing unit is between the OLT and the ODN;
the ODN is used for equally distributing the first mixed optical signal to each ONU according to optical power;
and the demultiplexing unit in each ONU is used for demultiplexing the distributed mixed optical signals and transmitting the data carried in each demultiplexed single optical signal to a corresponding terminal.
Here, the multiplexing unit is disposed between the OLT and the ODN, and each ONU is provided with a demultiplexing unit corresponding to the multiplexing unit, so that the multiplexing unit couples a first optical signal sent from the OLT and a second optical signal from the signal source to form a first mixed optical signal, and transmits the first mixed optical signal to the ODN, the ODN equally divides the first mixed optical power according to the optical power to the ONUs connected to the multiplexing unit, and each ONU divides a part of the first mixed optical signal, for example, the multiplexing unit is disposed between the OLT and the ODN in the system in fig. 2, so that each ONU can divide to 1/n of the first mixed optical signal. It should be understood that the mixed optical signals from each ONU have different optical powers only, and carry the same data, that is, each ONU, if provided with the demultiplexing unit and the HDMI corresponding to the multiplexing unit, can view high-definition video and enjoy high-fidelity audio. Such a scenario can be used in a remote information distribution system, a high-definition video conference office system, and the like, where each terminal connected to the ONU needs to share information carried by the second data.
In other embodiments, when the multiplexing unit is disposed between the ODN and the ONU, the multiplexing unit is further configured to obtain a third optical signal carrying first data from the ODN and a second optical signal from a signal source in the other sub-transmission system, and multiplex the third optical signal and the second optical signal to obtain a second mixed optical signal; transmitting the second mixed optical signal to the ONU through an optical fiber in the first sub-transmission system;
in the ONU, the demultiplexing unit is configured to receive the second mixed optical signal, perform demultiplexing on the second mixed optical signal to obtain a third optical signal and the second optical signal, and transmit the third optical signal to a first optical-to-electrical conversion unit; transmitting the second optical signal to a second photoelectric conversion unit; the first photoelectric conversion unit is configured to receive the third optical signal, perform third photoelectric conversion processing on the third optical signal to obtain a third electrical signal carrying the first data, and transmit the third electrical signal to the first terminal to complete transmission of the first data in the PON sub-transmission system; the second optical-to-electrical conversion unit is configured to receive the second optical signal, perform fourth optical-to-electrical conversion processing on the second optical signal, obtain a fourth electrical signal carrying the second data, and transmit the fourth electrical signal to the second terminal to complete transmission of the second data in the other sub-transmission systems, where the ONU is one or more of the ONUs.
Here, the multiplexing unit is disposed between the ODN and the ONU, and may be disposed between the ODN and one or more ONUs, and when the multiplexing unit is disposed between the ODN and the ONUs, each ONU needs to have a multiplexing unit before, for example, in the foregoing system in fig. 2, the multiplexing unit is disposed on a part of branches between the ODN and the ONUs. In this scenario, the signal source on each branch may be the same or different. The setting mode can be applied to occasions such as a public security high-definition monitoring system, a large medical imaging system and the like, wherein only part of terminals connected with the ONU need information carried by second data.
It should be noted that, the third optical signal and the first optical signal are both carried by first data, and the first data generally refers to data originally transmitted by the PON sub-transmission system; here, the fourth optical signal and the aforementioned second optical signal carry second data, and the second data also refers to data transmitted by the other sub transmission systems. The third optical signal is different from the first optical signal in magnitude of optical power. The first photoelectric conversion process, the second photoelectric conversion process, the third photoelectric conversion process, and the fourth photoelectric conversion process are only for convenience of describing different photoelectric conversion processes, and are not intended to limit the present invention.
It should be understood that, to complete the transmission of the first data and the second data, not only the multiplexing unit is disposed in the PON sub-transmission system, but also some changes are required on the ONU, and a photoelectric conversion structure and a second data output interface are added on the original ONU, taking the second data as video data as an example, as shown in fig. 3, a schematic structural diagram of the ONU is shown. In fig. 3, the ONU includes: the device comprises a PWDM, an HDMI photoelectric conversion module, a signal filtering module, a signal amplifying module, a single-fiber bidirectional Optical assembly (BOSA), a Central Processing Unit (CPU), a wired interface, a wireless interface and an HDMI; the PWDM, the HDMI photoelectric conversion module, the signal filtering module, the signal amplifying module and the HDMI are used for transmitting the second data; the PWDM, BOSA, CPU wired interface (or wireless interface) is used to transfer the aforementioned first data.
Specifically, the PWDM receives the transmitted first mixed optical signal or the transmitted second mixed optical signal, then performs demultiplexing on the first mixed optical signal or the second mixed optical signal to obtain an optical signal carrying second data and an optical signal carrying first data, transmits the optical signal carrying the second data in the HDMI photoelectric conversion module, the signal filtering module, the signal amplifying module and the HDMI, and finally transmits the second data to the second terminal, that is, to the player. The player plays the data based on the second data; the optical signal carrying the first data is transmitted at a BOSA and a CPU wired interface (or wireless interface), and finally the first data is transmitted to a first terminal, that is, to a computer (or mobile phone). It should be understood that the aforementioned wired interface may refer to a network port.
For a clearer understanding of the present invention, a PON sub-transmission system and another PON sub-transmission system are taken as an example for video sub-transmission.
In the related art, as shown in fig. 4, a schematic diagram of a transmission process of video data in the related art is shown. In fig. 4, the transmission of the video data is to transmit the video data through HDMI, and directly reach the player, and the player processes and plays the video data. The foregoing background art has demonstrated that the HDMI used at present is expensive either to distort the transmitted signal or to make it expensive, for example, the HDMI long-distance transmission signal of the conventional copper cable is easy to distort, and a repeater must be added; the optical fiber in the optical fiber HDMI is specially made, the manufacturing cost is very expensive, the manufacturing cost of the optical fiber HDMI with the length of 10 meters can be thousands of yuan, and the video transmission mode is not cheap even if the short distance transmission is carried out. Fig. 5 is a schematic diagram illustrating a transmission process of first data in a PON sub-transmission system according to an embodiment of the present invention. As can be seen from fig. 5, in the PON sub-transmission system, signal transmission is performed in an optical fiber, and it should be noted that the PON sub-transmission system is a national infrastructure, that is, the construction of the PON sub-transmission system is a national important deployment and has already been laid. On the basis, the invention couples the transmission of the video data to the PON sub-transmission system for transmission, and does not need to reform the original sub-transmission system and use HDMI with excessive special optical fibers, thereby saving resources and improving the utilization rate of the existing resources. Specifically, a schematic diagram of a process of transmitting video data coupled to a PON sub-transmission system and together with first data according to an embodiment of the present invention is shown in fig. 6. In fig. 6, the video source is a specific form of the signal source described above. The video source comprises an electro-optical conversion module, which converts an electrical signal carrying video data into an optical signal, multiplexes the optical signal and an optical signal carrying first data sent by the OLT into a mixed optical signal under the action of WDM, transmits the mixed optical signal in an optical fiber, and then reaches the ONU, separates the video data and the first data to respective interfaces under the action of PWDM in the ONU, and transmits the video data and the first data to corresponding terminals, for example, the video data is transmitted to a player, and the first data is transmitted to a computer (or a mobile phone) through a wired interface (or a wireless interface). When the method is adopted for video data transmission, the passive optical network can transmit signals with the speed of 10Gb or even 100Gb, the requirements of HDMI on transmission bandwidth are completely met, when the signals carrying video data are transmitted at an ultra-long distance, the signals do not need to be compressed, the signals can be directly transmitted in the optical fiber, the data transmission almost has no time delay, the data can not be lost, and the picture definition can not be reduced.
The embodiment of the invention provides a data transmission system, which couples an optical signal carrying second data sent by a signal source into a PON sub-transmission system for transmission, and because optical fibers are used as transmission media, the attenuation of long-distance signal transmission is basically negligible, the long-distance transmission of the second data can be realized, and high-quality data transmission can be ensured. The system and the method couple the data of other sub-transmission systems in the original passive optical network, do not need to modify the original passive network system in a large quantity, do not need to rewire, reduce the cost, can be suitable for the existing PON networks of various hospitals, schools and the like, save resources and improve the utilization rate of the existing resources.
Based on the same inventive concept, the embodiment of the present invention further provides a data transmission method, as shown in fig. 7. In fig. 7, the method is applied to a data transmission system, which includes: the first sub-transmission system of the at least two sub-transmission systems is a Passive Optical Network (PON) sub-transmission system; in the PON sub-transmission system, a multiplexing unit is arranged between an optical line terminal OLT and an optical network unit ONU; correspondingly, a demultiplexing unit corresponding to the multiplexing unit is arranged in the ONU; the method comprises the following steps:
s701: the multiplexing unit couples first data transmitted in the PON sub-transmission system with second data transmitted in other sub-transmission systems for transmission;
s702: the demultiplexing unit separates the first data from the second data and transmits the first data to a first terminal; transmitting the second data to a second terminal; wherein the other sub-transmission systems are sub-transmission systems except the first sub-transmission system in the at least two sub-transmission systems.
In some embodiments, the method further comprises:
the multiplexing unit obtains a first optical signal carrying the first data from the OLT and obtains a second optical signal carrying the second data from signal sources in the other sub-transmission systems; multiplexing the first optical signal and the second optical signal to obtain a first mixed optical signal; transmitting the first mixed optical signal to the ONU through an optical fiber in the first sub-transmission system;
in the ONU, the demultiplexing unit receives the first mixed optical signal and performs demultiplexing on the first mixed optical signal to obtain the first optical signal and the second optical signal; transmitting the first optical signal to a first photoelectric conversion unit; transmitting the second optical signal to a second photoelectric conversion unit; the first photoelectric conversion unit performs first photoelectric conversion processing on the first optical signal to obtain a first electric signal carrying the first data; transmitting the first electrical signal to the first terminal to complete transmission of the first data in the PON sub-transmission system; the second photoelectric conversion unit performs second photoelectric conversion processing on the second optical signal to obtain a second electrical signal carrying the second data; and transmitting the second electric signal to the second terminal to finish the transmission of the second data in the other sub-transmission systems.
In some embodiments, a plurality of ONUs are included in the first sub-transmission system, and each ONU is provided with a demultiplexing unit corresponding to the multiplexing unit; when the multiplexing unit is located between the OLT and an Optical Distribution Network (ODN) of the first sub-transmission system, the multiplexing unit transmits the first mixed optical signal to the ODN through an optical fiber in the first sub-transmission system;
the ODN equally divides the first mixed optical signal to each ONU according to optical power;
and the demultiplexing unit in each ONU performs demultiplexing processing on the distributed mixed optical signals and transmits data carried in each demultiplexed single optical signal to a corresponding terminal.
In some embodiments, when the multiplexing unit is disposed between the ODN and the ONU, the multiplexing unit obtains a third optical signal carrying first data from the ODN and a second optical signal from a signal source in the other sub-transmission system, and multiplexes the third optical signal and the second optical signal to obtain a second mixed optical signal; transmitting the second mixed optical signal to the ONU through an optical fiber in the first sub-transmission system;
in the ONU, the demultiplexing unit receives the second mixed optical signal, performs demultiplexing on the second mixed optical signal to obtain a third optical signal and the second optical signal, and transmits the third optical signal to the first optical-to-electrical conversion unit; transmitting the second optical signal to a second photoelectric conversion unit; the first photoelectric conversion unit receives the third optical signal, performs third photoelectric conversion processing on the third optical signal to obtain a third electrical signal carrying the first data, and transmits the third electrical signal to the first terminal to complete transmission of the first data in the PON sub-transmission system; and the second photoelectric conversion unit receives the second optical signal, performs fourth photoelectric conversion processing on the second optical signal to obtain a fourth electric signal carrying the second data, and transmits the fourth electric signal to the second terminal to complete transmission of the second data in the other sub-transmission systems, wherein the ONU is one or more of the ONUs.
The method provided by the embodiment of the invention belongs to the same inventive concept as the system provided by the foregoing, and the terms appearing herein have been described in detail in the introduction of the foregoing system, and are not described again herein.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above-described device embodiments are merely illustrative, for example, the division of the unit is only a logical functional division, and there may be other division ways in actual implementation, such as: multiple units or components may be combined, or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the coupling, direct coupling or communication connection between the components shown or discussed may be through some interfaces, and the indirect coupling or communication connection between the devices or units may be electrical, mechanical or other forms. The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed on a plurality of network units; some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment. In addition, all the functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be separately regarded as one unit, or two or more units may be integrated into one unit; the integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit. The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (7)
1. A data transmission system, the system comprising: at least two sub-transmission systems, wherein;
a first sub-transmission system of the at least two sub-transmission systems is a Passive Optical Network (PON) sub-transmission system; in the PON sub-transmission system, a multiplexing unit is arranged between an optical line terminal OLT and an optical network unit ONU; the multiplexing unit is used for coupling first data transmitted in the PON sub-transmission system and second data transmitted in other sub-transmission systems together for transmission; correspondingly, a demultiplexing unit corresponding to the multiplexing unit is arranged in the ONU; the demultiplexing unit is used for separating the first data from the second data and transmitting the first data to a first terminal; transmitting the second data to a second terminal, wherein the other sub-transmission systems are sub-transmission systems except the first sub-transmission system in the at least two sub-transmission systems;
the multiplexing unit is configured to obtain a first optical signal carrying the first data from the OLT and obtain a second optical signal carrying the second data from a signal source in the other sub-transmission system; multiplexing the first optical signal and the second optical signal to obtain a first mixed optical signal; transmitting the first mixed optical signal to the ONU through an optical fiber in the first sub-transmission system;
in the ONU, the demultiplexing unit is configured to receive the first mixed optical signal, and perform demultiplexing on the first mixed optical signal to obtain the first optical signal and the second optical signal; transmitting the first optical signal to a first photoelectric conversion unit; transmitting the second optical signal to a second photoelectric conversion unit; the first photoelectric conversion unit is configured to perform first photoelectric conversion processing on the first optical signal to obtain a first electrical signal carrying the first data; transmitting the first electrical signal to the first terminal to complete transmission of the first data in the PON sub-transmission system; the second photoelectric conversion unit is configured to perform second photoelectric conversion processing on the second optical signal to obtain a second electrical signal carrying the second data; transmitting the second electrical signal to the second terminal to complete the transmission of the second data in the other sub-transmission systems;
under the condition that the other sub-transmission systems are video and audio sub-transmission systems, the second data is video and audio data; and the second terminal is connected with the ONU by adopting a high-definition multimedia interface (HDMI) and is used for outputting high-definition video and/or audio based on the audio-video data.
2. The system according to claim 1, wherein a plurality of ONUs are included in the first sub-transmission system, each ONU being provided with a demultiplexing unit corresponding to the multiplexing unit; the multiplexing unit is further configured to transmit the first mixed optical signal to an Optical Distribution Network (ODN) of the first sub-transmission system through an optical fiber in the first sub-transmission system, when the multiplexing unit is between the OLT and the ODN;
the ODN is used for equally distributing the first mixed optical signal to each ONU according to optical power;
and the demultiplexing unit in each ONU is used for demultiplexing the distributed mixed optical signals and transmitting the data carried in each demultiplexed single optical signal to a corresponding terminal.
3. The system according to claim 2, wherein in a case that the multiplexing unit is disposed between the ODN and the ONU, the multiplexing unit is further configured to obtain a third optical signal carrying first data from the ODN and a second optical signal from a signal source in the other sub-transmission system, and perform multiplexing processing on the third optical signal and the second optical signal to obtain a second mixed optical signal; transmitting the second mixed optical signal to the ONU through an optical fiber in the first sub-transmission system;
in the ONU, the demultiplexing unit is configured to receive the second mixed optical signal, perform demultiplexing on the second mixed optical signal to obtain a third optical signal and the second optical signal, and transmit the third optical signal to a first optical-to-electrical conversion unit; transmitting the second optical signal to a second photoelectric conversion unit; the first photoelectric conversion unit is configured to receive the third optical signal, perform third photoelectric conversion processing on the third optical signal to obtain a third electrical signal carrying the first data, and transmit the third electrical signal to the first terminal to complete transmission of the first data in the PON sub-transmission system; the second optical-to-electrical conversion unit is configured to receive the second optical signal, perform fourth optical-to-electrical conversion processing on the second optical signal, obtain a fourth electrical signal carrying the second data, and transmit the fourth electrical signal to the second terminal to complete transmission of the second data in the other sub-transmission systems, where the ONU is one or more of the ONUs.
4. The system of claim 1, wherein the HDMI is a fiber HDMI or a copper core HDMI.
5. A system according to any one of claims 2 to 3, wherein the PON sub-transmission system is one of: ethernet passive optical network EPON, gigabit passive optical network GPON, 10GEPON, 10G passive optical network XG-PON and 10G bit symmetric passive optical network XGS-PON.
6. The system of claim 5, wherein the second optical signal has a wavelength of 1550 nm.
7. A data transmission method, applied to a data transmission system, the system comprising: the first sub-transmission system of the at least two sub-transmission systems is a Passive Optical Network (PON) sub-transmission system; in the PON sub-transmission system, a multiplexing unit is arranged between an optical line terminal OLT and an optical network unit ONU; correspondingly, a demultiplexing unit corresponding to the multiplexing unit is arranged in the ONU; the method comprises the following steps:
the multiplexing unit couples first data transmitted in the PON sub-transmission system with second data transmitted in other sub-transmission systems for transmission;
the demultiplexing unit separates the first data from the second data and transmits the first data to a first terminal; transmitting the second data to a second terminal;
wherein the other sub-transmission systems are sub-transmission systems except the first sub-transmission system in the at least two sub-transmission systems;
wherein the method further comprises:
the multiplexing unit obtains a first optical signal carrying the first data from the OLT and obtains a second optical signal carrying the second data from signal sources in the other sub-transmission systems; multiplexing the first optical signal and the second optical signal to obtain a first mixed optical signal; transmitting the first mixed optical signal to the ONU through an optical fiber in the first sub-transmission system;
in the ONU, the demultiplexing unit receives the first mixed optical signal and performs demultiplexing on the first mixed optical signal to obtain the first optical signal and the second optical signal; transmitting the first optical signal to a first photoelectric conversion unit; transmitting the second optical signal to a second photoelectric conversion unit; the first photoelectric conversion unit performs first photoelectric conversion processing on the first optical signal to obtain a first electric signal carrying the first data; transmitting the first electrical signal to the first terminal to complete transmission of the first data in the PON sub-transmission system; the second photoelectric conversion unit performs second photoelectric conversion processing on the second optical signal to obtain a second electrical signal carrying the second data; transmitting the second electrical signal to the second terminal to complete the transmission of the second data in the other sub-transmission systems; under the condition that the other sub-transmission systems are video and audio sub-transmission systems, the second data is video and audio data; and the second terminal is connected with the ONU by adopting a high-definition multimedia interface (HDMI) and is used for outputting high-definition video and/or audio based on the audio-video data.
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