CN107483904B - Cable television inter-cut system and branching filter - Google Patents
Cable television inter-cut system and branching filter Download PDFInfo
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- CN107483904B CN107483904B CN201710684446.4A CN201710684446A CN107483904B CN 107483904 B CN107483904 B CN 107483904B CN 201710684446 A CN201710684446 A CN 201710684446A CN 107483904 B CN107483904 B CN 107483904B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/22—Adaptations for optical transmission
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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
- H04B10/25751—Optical arrangements for CATV or video distribution
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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
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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
- H04J14/0215—Architecture aspects
- H04J14/0217—Multi-degree architectures, e.g. having a connection degree greater than two
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/60—Network streaming of media packets
- H04L65/61—Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio
- H04L65/612—Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio for unicast
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Abstract
A cable television broadcasting system and a branching filter. Comprising N optical transmitters. The 1 st input interface of any one or more of the N optical transmitters is used for receiving a 1 st input signal, wherein the 1 st input signal comprises a broadcast television signal; the 2 nd input interface of the optical transmitter is used for receiving the 2 nd input signal, the 2 nd input signal is the program signal of user's request that the network quadrature amplitude modulator corresponding to optical transmitter sends out; the optical transmitter is used for respectively converting the user-requested program signal into optical signals and transmitting the optical signal of the user-requested program signal and the broadcast television signal in a wavelength division multiplexing manner. The optical transmitters are increased or decreased according to the actual number of users covered by the on-demand, so that the network construction requirement can be met by slightly changing the network when the on-demand coverage users are increased or the on-demand rate is increased, the capacity expansion cost of the system is reduced, the system structure and the network operation and maintenance are simplified, and the operation cost is reduced.
Description
Technical Field
The invention relates to the technical field of cable television transmission, in particular to a cable television inter cut system and a wave separator.
Background
With the emergence of new video transmission technologies such as satellite broadcast television (bcch) and Internet Protocol Television (IPTV), competition of network operators in the video transmission field is intensified. Therefore, network operators, especially radio and television operators, need to actively develop Video On Demand (VOD) technology and applications and provide colorful interactive services to enhance the loyalty of users, reduce the loss of users and increase the average income (ARPU) value of users.
The VOD service meets the personalized requirements of television users, and is the most extensive interactive value-added service for cable television network operators. For VOD interactive video-on-demand services, there are two main ways to implement: one is implemented by an Internet Protocol Quadrature Amplitude Modulation (IPQAM) method, and the other is implemented by an IPTV method. When the IPQAM is used for interaction, the cable television broadcast channel is used as a video downlink channel, a certain broadcast channel bandwidth is occupied, and for a bidirectional data channel, only a few data bandwidth is required for on-demand. When data interaction is carried out in an IPTV mode, the data channel is used as an uplink channel and a downlink channel for on-demand, and the requirement on downlink data bandwidth is high.
In the example of the video downstream channel as VOD service by the IPQAM scheme, the total front end and the branch front end are included. The main front end obtains the corresponding on-demand resource through the IP router and sends the resource to the branch front ends. The master headend also transmits broadcast television optical signals (broadcast television program signals) to the branch headends over the optical link.
The branch front end sends the received digital broadcast television optical signal and the user on-demand program signal to users in a certain coverage range. Specifically, the sub front end modulates the on-demand signal through IPQAM and then sends the digital narrowcast television optical signal through a 1550nm direct modulation wavelength optical transmitter. And multiplexing the digital narrowcast television optical signal and the digital broadcast television optical signal transmitted by the 1550nm directly-modulated wavelength optical transmitter through an optical multiplexer. And amplifying and distributing the multiplexed optical signals by an EDFA, then transmitting the optical signals by optical fibers, and finally receiving the optical signals by an optical receiver.
However, as the number of users covered by the on-demand service increases or the on-demand rate increases, the frequency point resource provided by the IPQAM in the sub-front end cannot meet the demand, and the on-demand stream carried by a single 1550nm add-drop wavelength cannot meet the demand, at this time, on one hand, the IPQAM board card needs to be added, and on the other hand, the add-drop wavelength and the number of covered users of the EDFA connected behind the add-drop wavelength need to be reduced, which will cause the system architecture of the whole sub-front end to be greatly changed, thereby causing cost increase and network operation to be poor.
Disclosure of Invention
The specific embodiment of the application provides a cable television inter-cut system and a branching filter, and a plurality of optical transmitters are arranged in the system, and different optical transmitters correspond to different users respectively, so that the system coverage is increased, or the on-demand rate is improved, and meanwhile, the system architecture is slightly changed.
In one aspect, a cable tv spot system is provided in embodiments herein, where the system includes N optical transmitters, where N is a positive integer greater than or equal to 1; the 1 st input interface of any one or more of the N optical transmitters is used for receiving a 1 st input signal, wherein the 1 st input signal comprises a broadcast television signal; the 2 nd input interface of the optical transmitter is used for receiving a 2 nd input signal, the 2 nd input signal is a user on-demand program signal sent by a network quadrature amplitude modulator corresponding to the optical transmitter, the broadcast television signal is an optical signal with a fixed frequency wavelength, and the user on-demand program signal is a radio frequency signal; the optical transmitter is used for respectively converting the user request program signals into optical signals and transmitting the optical signals and the broadcast television signals of the user request program signals in a wavelength division multiplexing mode.
In one possible design, the N optical transmitters are connected in series, and the 1 st input signal input by the 1 st input interface of the 2 nd to nth optical transmitters further includes an optical signal converted from a user-requested program signal by a previous-stage optical transmitter, where a wavelength interval exists between each two optical signals in the optical signal of the broadcast television signal and each two optical signals in the N optical signals converted from the user-requested program signal; the system further comprises X wave splitters, wherein the wave splitters are used for receiving optical signals output by the Nth-level optical transmitter and outputting optical signals with fixed frequency and wavelength, the area range of users corresponding to the wavelength of the optical signals output by 1-Y wave splitters in the X wave splitters is the same as that of the users corresponding to the optical transmitter which multiplexes through the wavelength, X is a positive integer larger than or equal to N, and Y is a positive integer smaller than or equal to X.
In one possible design, the wavelength interval existing between the optical signal of the broadcast television signal and the N optical signals converted from the user-requested program signal complies with the dense optical wavelength multiplexing wavelength interval requirement specified by the international telecommunications union.
In one possible design, the system further includes a multiport high power optical amplifier; the multi-port high-power optical amplifier receives the signal output by the Nth optical transmitter and amplifies the signal; and the multi-port high-power optical amplifier also sends the amplified signals to the wave splitter.
In one possible design, the system further includes an erbium doped fiber amplifier; the erbium-doped optical fiber amplifier receives the signal output by the Nth optical transmitter and amplifies the signal; and the erbium-doped fiber amplifier also sends the amplified signal to the wave separator.
In one possible design, the wave splitter includes a 1 st wave division multiplexer, a 2 nd wave division multiplexer and a 3 rd wave division multiplexer; the 1 st wavelength division multiplexer acquires an optical signal sent by an Nth optical transmitter through a public common port, outputs an optical signal with the Ai wavelength through an output straight-through port, and outputs signals with other wavelengths after the Ai wavelength is removed from the input optical signal through a reflection port; the 2 nd wavelength division multiplexer is used for acquiring the optical signal output by the 1 st wavelength division multiplexer reflection port through the public port, outputting the optical signal of the B-th wavelength through the output through port and outputting the signals of other wavelengths except the B-th wavelength through the reflection port; the 3 rd wavelength division multiplexer is used for acquiring an optical signal with the Ai wavelength through the through port and acquiring an optical signal with the B wavelength through the reflection port, and the 3 rd wavelength division multiplexer outputs the optical signal with the Ai wavelength and the B wavelength through the public port after multiplexing the optical signals; the optical signal with the Ai wavelength is an inter-cut signal, and the optical signal with the B wavelength is a broadcast signal.
In one possible design, the 1 st wavelength division multiplexer acquisition, the 2 nd wavelength division multiplexer, and the 3 rd wavelength division multiplexer are dense wavelength division multiplexers.
In one possible design, the 2 nd input interfaces of the N optical transmitters are connected to different ports of a network quadrature amplitude modulator; or the 2 nd input interfaces of Z optical transmitters in the N optical transmitters are connected with different ports of a network quadrature amplitude modulator; or the 2 nd input interfaces of the N optical transmitters are connected with different ports of one network quadrature amplitude modulator.
In a second aspect, a specific embodiment of the present application provides a demultiplexer, where the demultiplexer includes a 1 st wavelength division multiplexer, a 2 nd wavelength division multiplexer, and a 3 rd wavelength division multiplexer; the 1 st wavelength division multiplexer acquires an optical signal sent by an Nth optical transmitter through a public common port, outputs an inter-cut optical signal with the Ai wavelength through an output through port, and outputs signals with other wavelengths after the Ai wavelength is removed from the input optical signal through a reflection port; the 2 nd wavelength division multiplexer is used for acquiring the optical signal output by the 1 st wavelength division multiplexer reflection port through the public port, outputting the optical signal of the B-th wavelength through the output through port and outputting the signals of other wavelengths except the B-th wavelength through the reflection port; the 3 rd wavelength division multiplexer is used for acquiring an optical signal with the Ai wavelength through the through port and acquiring an optical signal with the B wavelength through the reflection port, and the 3 rd wavelength division multiplexer outputs the optical signal with the Ai wavelength and the B wavelength through the public port after multiplexing the optical signals.
In one possible design, the 1 st, 2 nd, and 3 rd wavelength division multiplexers are dense wavelength division multiplexers.
According to the broadcast television rebroadcasting system provided by the specific embodiment of the application, the plurality of network quadrature amplitude modulators and the optical transmitters are arranged in the system, and the corresponding network quadrature amplitude modulators and the corresponding optical transmitters are increased or reduced according to the number of the current actual users covered by the on-demand programs, so that the actual use network construction requirements of the users can be met by changing the network very little when the on-demand coverage users are increased or the on-demand rate is increased, the capacity expansion cost of the system is reduced, the system structure and the network operation and maintenance are simplified, and the operation cost is reduced.
Drawings
Fig. 1A is an information processing portion of a broadcast television relay system according to an embodiment of the present application;
fig. 1B is a diagram illustrating an information transmission portion of a broadcast television relay system according to an embodiment of the present application;
fig. 2 is a diagram of a wave splitter according to an embodiment of the present application;
fig. 3 is a data transmission system according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some 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 application.
The technical solutions provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.
It should be noted that, the network Quadrature Amplitude Modulation (IPQAM) modulator described in the embodiment of the present application integrates functions of "scrambling, modulating, and Frequency conversion", and reuses a program stream input from the DVB/IP backbone network in a designated multi-service transport stream, and then performs QAM Modulation and Frequency conversion, and outputs a Radio Frequency (RF) signal.
Fig. 1 is a cable television insertion system according to an embodiment of the present application, including fig. 1A and fig. 1B, where fig. 1A is an information processing portion of a cable television insertion system according to an embodiment of the present application, and fig. 1B is an information transmission portion of a cable television insertion system according to an embodiment of the present application. As shown in fig. 1, the system includes receiving broadcast television program signals and user on-demand program signals transmitted by the headend. And after multiplexing the broadcast television program signal and the user on-demand program signal, inputting the multiplexed signal to a user set top box, and decoding the broadcast television program signal or the on-demand program signal through the user set top box and then playing the decoded signal.
Specifically, the system comprises an IPQAM modulator and an optical transmitter. In the system, the number of IPQAM modulators and optical transmitters can be flexibly adjusted according to the number of users required to be covered. Due to the limitation of frequency point frequency planning of modulators, generally, channels for on-demand programming are very limited, the number of frequency points allocated to on-demand is generally about two or three in a frequency spectrum of 47-860 MHz, and in order to be well matched with IPQAM (one port outputs 8 frequency points), the number of on-demand frequency points is generally arranged to be multiples of 8, so that the conventional inter-cut frequency points are planned to be 16 or 24 and 32 at most, and each inter-cut optical transmitter can only provide an appointed number of on-demand requests. According to the method and the device, the number of users covered by the system is increased or the demand for increasing the on-demand rate in the coverage area is met by increasing the optical transmitters (reducing the size of the coverage user area of the optical transmitters) and allocating corresponding frequency point resources for the increased optical transmitters.
In the example of the system comprising an IPQAM modulator and an optical transmitter, the IPQAM modulator enables a user to re-multiplex a user on-demand program signal input by DVB/IP from an IP backbone network into a designated multi-service transmission stream, and then carries out QAM modulation and Frequency conversion to output a Radio Frequency (RF) user on-demand program signal. The optical transmitter is used for receiving broadcast television. The optical transmitter is used for converting the RF on-demand program signal output by the IPQAM modulator into an on-demand program optical signal, and then multiplexing and outputting the on-demand program optical signal and a broadcast television program optical signal. The output signals include optical signals at a first wavelength of broadcast television program signals and optical signals at a second wavelength of on-demand program light.
In the case where the system includes a plurality of optical transmitters, the following description will be made by taking an example where the system includes N optical transmitters, where N is a positive integer greater than 1. The first through Nth optical transmitters are connected in series, each of the N optical transmitters includes a first input line and a second input line, and the second input line of each optical transmitter is used for connecting with an IPQAM modulator. The first input line is used for inputting a first signal, and the second line is used for inputting a second signal.
A first signal input by a first optical transmitter of the N optical transmitters through a first input line is a direct broadcast program optical signal with a first wavelength, a second signal input by the first optical transmitter of the N optical transmitters through a second input line is a first on-demand program signal output by an IPQAM modulator connected to the first optical transmitter, and the first on-demand program signal is an RF signal.
The first optical transmitter converts a first on-demand program signal output by the IPQAM modulator into a first on-demand program optical signal, wherein the first on-demand program optical signal is of a second wavelength. And the first optical transmitter outputs the first on-demand program optical signal and the broadcast television program optical signal after multiplexing. The output signals include optical signals of a first wavelength of broadcast television program signals and optical signals of a second wavelength of first on-demand program light.
The second optical transmitter is connected with the first optical transmitter, the IPQAM modulator and the third optical transmitter, wherein an output line of the first optical transmitter is connected with a first input line of the second optical transmitter, a second input line of the second optical transmitter is connected with the IPQAM modulator, and an output line of the second optical transmitter is connected with a first input line of the third optical transmitter. The signals input by the first optical transmitter to the second optical transmitter include optical signals of a first wavelength of broadcast television program signals and optical signals of a second wavelength of first on-demand program light. The signal input by the IPQAM modulator to the second optical transmitter comprises a second program-on-demand signal, and the second program-on-demand signal is an RF signal.
And the second optical transmitter converts a second program-on-demand signal input by the IPQAM modulator into a second program-on-demand optical signal, wherein the second program-on-demand optical signal is a third wavelength. And the second optical transmitter multiplexes the optical signal with the first wavelength of the broadcast television program signal input by the first optical transmitter, the optical signal with the second wavelength of the first on-demand program light and the optical signal of the second on-demand program and outputs the multiplexed optical signals. The output signals include a broadcast program signal optical signal of a first wavelength, a first on-demand program optical signal of a second wavelength, and a second on-demand program optical signal of a third wavelength.
The third optical transmitter is connected with the second optical transmitter, the IPQAM modulator and the fourth optical transmitter. The third optical transmitter receives a signal output by the second optical transmitter through a first input line, receives a third multicast program signal input by the IPQAM modulator through a second input line, and the third multicast program signal is an RF signal. In the above manner, the RF signal is converted into an optical signal, the optical signals of two different input lines are multiplexed, and the multiplexed signal is transmitted to the optical transmitter of the next stage until the nth stage optical transmitter outputs a signal. The output signals comprise broadcast television program optical signals and first to Nth on-demand program optical signals, wherein the direct broadcast program optical signals are of a first wavelength, the first on-demand program optical signals are of a second wavelength, and the Nth on-demand program optical signals are of an N +1 th wavelength. Any two optical signals in the N +1 optical signals with different frequency band wavelengths from the first wavelength to the (N + 1) th wavelength respectively comprise a first interval to meet a certain interval. The Wavelength spacing complies with the Dense Wavelength Division Multiplexing (DWDM) Wavelength spacing requirements specified by the International Telecommunications Union (ITU).
In the above embodiment of the present application, the 2 nd input interfaces of the N optical transmitters are connected to different ports of one network quadrature amplitude modulator; or the 2 nd input interfaces of Z optical transmitters in the N optical transmitters are connected with different ports of a network quadrature amplitude modulator; or the 2 nd input interfaces of the N optical transmitters are connected with different ports of one network quadrature amplitude modulator.
In a specific embodiment of the present application, the signal output by the nth optical transmitter includes a plurality of on-demand program optical signals of different wavelengths. In order to make the user receive the program-on-demand optical signal corresponding to the program on demand, the system also comprises a wave separator, and the user receives the program-on-demand optical signal of the program on demand through the wave separator. Specifically, a user terminal in the coverage area of a wave separator is divided into a user group, and the user group corresponds to the IPQAM modulator. And sending the on-demand program information to an IPQAM modulator corresponding to the user group according to the user group corresponding to the user requesting the on-demand program information. And then the program-on-demand information is converted into an optical signal with fixed wavelength and multiplexed with other optical signals by the IPQAM modulator.
In one example, the nth optical transmitter includes a plurality of signal output ports, and the plurality of signal output ports are respectively connected to a splitter, and transmit an optical signal with a specific wavelength to a specific region through the splitter. And the user side receiving device receives the signal, and decodes and plays the signal according to the signal.
In another example, the nth optical transmitter and the demultiplexer are respectively connected to a multi-port optical amplifier, and the nth optical transmitter outputs an optical signal including first to N +1 th wavelengths to the multi-port optical amplifier. The multiport optical amplifier amplifies the optical signals with the first to the (N + 1) th wavelengths and then respectively sends the amplified optical signals to a plurality of wave splitters, and the optical signals with the specified wavelengths are transmitted to a specified area through the wave splitters. And the user side receiving device receives the signal, and decodes and plays the signal according to the signal.
Fig. 2 is a wave splitter according to an embodiment of the present application. As shown in fig. 2, the demultiplexer outputs an optical signal of a specific wavelength. For example, the wave-separator includes a 1 st wave-division multiplexer, a 2 nd wave-division multiplexer, and a 3 rd wave-division multiplexer; the 1 st wavelength division multiplexer acquires an optical signal sent by an Nth optical transmitter through a public common port, outputs an inter-cut optical signal with the Ai wavelength through an output through port, and outputs signals with other wavelengths after the Ai wavelength is removed from the input optical signal through a reflection port; the 2 nd wavelength division multiplexer is used for acquiring the optical signal output by the 1 st wavelength division multiplexer reflection port through the public port, outputting the optical signal of the B-th wavelength through the output through port and outputting the signals of other wavelengths except the B-th wavelength through the reflection port; the 3 rd wavelength division multiplexer is used for acquiring the optical signal with the Ai wavelength through the output port and acquiring the optical signal with the B wavelength through the reflection port, and the 3 rd wavelength division multiplexer outputs the optical signal with the Ai wavelength and the B wavelength through the public port after multiplexing the optical signal with the Ai wavelength and the B wavelength.
In a specific embodiment of the present application, the optical signal output by each of the plurality of wave splitters includes an optical signal of a broadcast television program and an optical signal of a on-demand program, wherein the optical signal of the direct broadcast television program is of a first wavelength, and the optical signal of the on-demand program is of a 2 nd wavelength to an N +1 th wavelength. Therefore, in a specific embodiment of the present application, the optical signal output by each of the plurality of splitters includes any one of the optical signal of the first wavelength and the optical signal of the 2 nd wavelength through the optical signal of the N +1 th wavelength.
In the demultiplexer that outputs the optical signal of the first wavelength and the optical signal of the 2 nd wavelength to any one of the optical signals of the N +1 th wavelength, the demultiplexer may be configured to
In one example, the demultiplexer assumes a wavelength selection function, with its input being N +1 wavelengths (N narrowcast wavelengths and 1 broadcast wavelength) and its output being 1 broadcast wavelength + a narrowcast wavelength. The demultiplexer is composed of 3 conventional optical element dense Wavelength Division Multiplexers (WDM) (the WDM device is a device that synthesizes and separates optical wavelengths). 1 broadcast wavelength (lambda 0) and 4 narrow broadcast wavelengths (lambda 1-lambda 4) are input into a public port of a first WDM number W10 of the wave splitter together, a through port of W10 passes through the wavelength of lambda 4, a reflection port outputs a light wave of lambda 0 lambda 1 lambda 2 lambda 3, a light wave of a reflection port of W10 lambda 0 lambda 1 lambda 2 lambda 3 is connected to a public port of W11, a through port of W11 passes through the lambda 0 light wave, and a transmission port outputs a light wave of lambda 1 lambda 2 lambda 3. The optical wave λ 4 λ 0 of the through port of W10, W11 is connected to the through port and the reflection port of W12, respectively, and λ 4 λ 0 optical wave appears at the COM port of W12, and the splitter realizes the separation of the broad wavelength λ 0 and a narrow-cast wavelength λ 4 from 5 wavelengths.
It should be noted that the input light wave and the output light wave are only distances in the specific embodiment of the present application, and are not used to limit the present application. In a specific embodiment of the present application, the signal output by each WDM can be set according to actual needs.
In the above examples, outputting the optical signals of the first wavelength and the second wavelength is only an example of the specific embodiment of the present invention, and is not used to limit the present invention. Based on the basic idea of the splitter, those skilled in the art can make the splitter output optical signals of any number of wavelengths and any wavelength according to actual needs without creative work.
It should be noted that the present application does not specifically limit the structure type, model, and the like of the wavelength division multiplexer. For example, the wavelength division multiplexers may be Dense Wavelength Division Multiplexing (DWDM), respectively.
Fig. 3 is a data transmission system according to an embodiment of the present application. As in fig. 3, including a total front end and a partial front end. The master headend provides resources for broadcast television program signals and user on-demand program signals to the slave headends. The sub front end obtains the user request program signal and the broadcast television program signal from the main front end. The sub-head end includes a means for providing broadcast television program signals and user on-demand program signals to a plurality of users within the system coverage area.
The user is connected with a Home terminal and an optical Fiber direct-To-Home (FTTH) optical machine through a bidirectional set top box. The user terminal obtains a user on-demand program signal and a direct broadcast television program signal through an FTTH Optical machine, and obtains or sends a Network signal through an Optical Network Unit (ONU).
And the IP router at the branch front end receives a program-on-demand request sent by a user, wherein the program-on-demand request comprises user information and a program requested to be on-demand. And after determining the user information according to the request, the IP router at the branch front end sends the request to the IP router at the main front end. And the IP router of the main front end distributes the requested on-demand program resources to the user according to the request.
And the network (Internet Protocol, IP) router of the main front end sends the on-demand program resource to the IP router of the branch front end according to the user information. And the IP router at the branch front end sends the on-demand program resources to the IPQAM modulator, and the on-demand program resources also comprise a port number sent by the IPQAM modulator. Thereby sending the user-on-demand program signal to the corresponding optical transmitter through the IPQAM modulator. And the optical transmitter receives a user on-demand program signal sent by the IPQAM modulator, wherein the user on-demand program signal comprises on-demand program resources. The optical transmitter converts the user program-on-demand signal from a radio frequency signal into an optical signal, multiplexes the live program optical signal and the program-on-demand optical signal and then sends the multiplexed signal to the user.
In a specific embodiment of the present application, a specific connection structure of the IPQAM modulator and a plurality of optical transmitters, which include optical multiplexing, may be as shown in fig. 1.
When the second input ports of a plurality of optical transmitters in the system are connected with different IPQAM modulators, the IP router also determines to send the user information to the IPQAM modulator corresponding to the user information according to the user information.
In any of the above embodiments of the present application, the optical transmitter may be a 1550nm direct dimming transmitter.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or device that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or device. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of additional like elements in the article or device in which the element is included.
Those skilled in the art will appreciate that the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (8)
1. A cable television inter-cut system, characterized by, the said system includes N optical transmitters, N is greater than or equal to the positive integer of 1;
the 1 st input interface of any one or more of the N optical transmitters is used for receiving a 1 st input signal, wherein the 1 st input signal comprises a broadcast television signal; the 2 nd input interface of the optical transmitter is used for receiving a 2 nd input signal, the 2 nd input signal is a user on-demand program signal sent by a network quadrature amplitude modulator corresponding to the optical transmitter, the broadcast television signal is an optical signal with a fixed wavelength, and the user on-demand program signal is a radio frequency signal;
the optical transmitter is used for respectively converting the user request program signals into optical signals and transmitting the optical signals and the broadcast television signals of the user request program signals in a wavelength division multiplexing mode;
the system further comprises X wave splitters, wherein the wave splitters are used for receiving optical signals output by the Nth-level optical transmitter and outputting optical signals with fixed wavelengths, the area range of users corresponding to the wavelengths of the optical signals output by 1-Y wave splitters in the X wave splitters is the same as that of the users corresponding to the optical transmitter which multiplexes through the wavelengths, X is a positive integer larger than or equal to N, and Y is a positive integer smaller than or equal to X.
2. The system of claim 1, wherein the N optical transmitters are connected in series, and the 1 st input signal input by the 1 st input interface of the 2 nd to nth optical transmitters further comprises an optical signal converted from a user-requested program signal by a previous optical transmitter, wherein a wavelength interval exists between each two optical signals of the optical signal of the broadcast television signal and the N optical signals converted from the user-requested program signal.
3. The system of claim 2, wherein the wavelength interval between the optical signal of the broadcast television signal and the N optical signals converted from the user-requested program signal complies with the wavelength interval requirement for dense optical multiplexing specified by the international telecommunications union.
4. The system of claim 2, further comprising a multiport high power optical amplifier; the multi-port high-power optical amplifier receives the signal output by the Nth optical transmitter and amplifies the signal; and the multi-port high-power optical amplifier also sends the amplified signals to the wave splitter.
5. The system of claim 2, further comprising an erbium doped fiber amplifier; the erbium-doped optical fiber amplifier receives the signal output by the Nth optical transmitter and amplifies the signal; and the erbium-doped fiber amplifier also sends the amplified signal to the wave separator.
6. The system of claim 4, wherein the wave splitter comprises a 1 st wave division multiplexer, a 2 nd wave division multiplexer, and a 3 rd wave division multiplexer; the 1 st wavelength division multiplexer acquires an optical signal sent by an Nth optical transmitter through a common port, outputs an optical signal with the Ai wavelength through a straight-through port, and outputs an input optical signal with other wavelengths except the Ai wavelength through a reflection port; the 2 nd wavelength division multiplexer is used for acquiring the optical signal output by the 1 st wavelength division multiplexer through the public port, outputting the optical signal with the B wavelength through the through port and outputting the signals with other wavelengths except the B wavelength through the reflection port; the 3 rd wavelength division multiplexer is used for acquiring an insert optical signal with the Ai wavelength through the through port and acquiring a broadcast optical signal with the B wavelength through the reflection port, and the 3 rd wavelength division multiplexer multiplexes the optical signals with the Ai wavelength and the B wavelength and outputs the multiplexed optical signals through the public port; the optical signal with the Ai wavelength is an inter-cut signal, and the optical signal with the B wavelength is a broadcast signal.
7. The system of claim 6, wherein the 1 st wavelength division multiplexer acquisition, the 2 nd wavelength division multiplexer, and the 3 rd wavelength division multiplexer are dense wavelength division multiplexers.
8. The system of claim 1, wherein the 2 nd input interfaces of the N optical transmitters are connected to different ports of a network quadrature amplitude modulator; or
The 2 nd input interfaces of Z optical transmitters in the N optical transmitters are connected with different ports of a network quadrature amplitude modulator, and Z is a positive integer smaller than N; or
The 2 nd input interfaces of the N optical transmitters are connected to different ports of a network quadrature amplitude modulator.
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