CN101001112A - Method, device and system for transmitting data signal using optical fibre - Google Patents
Method, device and system for transmitting data signal using optical fibre Download PDFInfo
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- CN101001112A CN101001112A CNA2006100637744A CN200610063774A CN101001112A CN 101001112 A CN101001112 A CN 101001112A CN A2006100637744 A CNA2006100637744 A CN A2006100637744A CN 200610063774 A CN200610063774 A CN 200610063774A CN 101001112 A CN101001112 A CN 101001112A
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Abstract
This invention provides a method, a device and a system for utilizing fibers to transfer data signals, in which, said method includes: at the transmission end, plugging a clock frequency in multiplied data signals to form mixed signals to be sent to the receiving end by fibers, filtering the mixed signals to get clock frequency to be multiplied to a sub-carrier frequency to resume data signals transmitted at the receiving end. This invention transmits a clock frequency and a multiplied data signal mixedly, thus, the receiving end needs only one filter, so it's easy to filter clock frequency in the mixed signals, the frequency of the pilot frequency is low and there is no interference beside signals so as to resume xDSL signals at the receiving end transmitted by fibers correctly.
Description
Technical field
The invention belongs to electronic communication field, relate in particular to a kind of methods, devices and systems that utilize the optical fiber data signal.
Background technology
In various Digital Subscriber Line (xDSL) technology, all be by unshielded twisted pair (Unshielded Twisted Paired by DSL couple in multiplexer (DSLAM), UTP) MODEM that is connected to a plurality of users realizes transfer of data, but present this system exists speed along with the distance of the twisted wire of twisted-pair feeder becomes far away and problem that reduce.Yet the user but in continuous rising, makes bandwidth and distance in the access network become the bottleneck of new business development to the demand of bandwidth.In order to address this problem; protect the twisted-pair wire net of operator's existing investment simultaneously; introduced DSL over Fiber technology; as shown in Figure 1; be about to the DSL signal by frequency division multiplexing (frequency domain multiplexing; FDM) mode is transferred to a remote terminal, and (remote terminal RT), utilizes twisted-pair feeder to be connected on the MODEM the user family from terminal again.Two kinds of implementation methods are arranged on the structure: as shown in Figure 2, by increase a transition card in existing DSLAM equipment, this card is used for multichannel DSL signal multiplexing by frequency multiplexing technique, convert light signal again to and send, and receiving course in contrast; Perhaps as shown in Figure 3, keep original DSLAM equipment constant, outside DSLAM equipment, add a special signalling arrangement again, utilize the equipment of this increase to do the multiplex/demultiplex of analog signal, and photoelectricity/electric light conversion.Concrete transfer process is: (each road DSL signal is shown in Fig. 4 A,) modular converter is clock frequency (clockfrequency, Fc) by multiplier or contain phase-locked loop (Phase Locked Logic, PLL) frequency synthesizer produces a plurality of subcarrier frequencies (shown in Fig. 4 B), the DSL signal that needs are transmitted is modulated on the subcarrier frequency, multichannel DSL signal frequency division multiplexing (FDM) after will modulating again arrives together, become one road signal (shown in Fig. 4 C), send to by electric light conversion and to be sent to remote terminal (RT) in the optical fiber, remote terminal must use identical subcarrier frequency and the identical subcarrier phase could the correct data demultiplexing is come out.And how to obtain the bottleneck place that the same subcarrier frequency of homophase frequently realizes DSL over Fiber technology just at receiving terminal.
Summary of the invention
In view of this, the main purpose of the embodiment of the invention is to provide a kind of methods, devices and systems that utilize the optical fiber data signal, make data-signal transmit improve transmission range, solve in the xDSL business speed decline problem that the increase along with transmission range brings by optical fiber.
The embodiment of the invention provides a kind of method of utilizing the optical fiber data signal, comprising:
In transmitting terminal is inserted in clock frequency data-signal after multiplexing, form mixed signal, and send to receiving terminal by optical fiber;
At receiving terminal the mixed signal that receives is carried out filtering, obtain clock frequency;
To subcarrier frequency, utilize this subcarrier frequency need to recover the data-signal of transmission this clock frequency frequency multiplication.
A kind of R-T unit that utilizes the optical fiber data signal comprises transmitting apparatus and receiving equipment, and wherein, described transmitting apparatus comprises:
Mixed cell is used for the data-signal that clock frequency is inserted into after multiplexing is formed mixed signal;
Transmitting terminal light Transmit-Receive Unit is used to receive the signal of described mixed cell output, and should mixed conversion of signals was that light signal sends;
Described receiving equipment comprises:
The frequency multiplication unit is used for clock frequency is carried out frequency multiplication, obtains subcarrier signal;
Demodulating unit is used to utilize the subcarrier signal of frequency multiplication unit output to recover the data-signal that needs transmit.
A kind of dispensing device that utilizes the optical fiber data signal comprises:
Mixed cell is used for the data-signal that clock frequency is inserted into after multiplexing is formed mixed signal;
Transmitting terminal light Transmit-Receive Unit is used to receive the signal of described mixed cell output, and should mixed conversion of signals was that light signal sends.
A kind of receiving system that utilizes the optical fiber data signal comprises:
The frequency multiplication unit is used for clock frequency is carried out frequency multiplication, obtains subcarrier signal;
Demodulating unit is used to utilize the subcarrier signal of frequency multiplication unit output to recover the data-signal that needs transmit.
A kind of system that utilizes the optical fiber data signal, comprise transmitting apparatus, receiving equipment and be connected transmitting apparatus and the optical fiber of receiving equipment, described transmitting apparatus comprises: mixed cell is used for the data-signal that clock frequency is inserted into after multiplexing is formed mixed signal; Transmitting terminal light Transmit-Receive Unit is used to receive the signal of described mixed cell output, and should mixed conversion of signals was that light signal sends;
Described receiving equipment comprises: the frequency multiplication unit, be used for clock frequency is carried out frequency multiplication, and obtain subcarrier signal; Demodulating unit is used to utilize the subcarrier signal of frequency multiplication unit output to recover the data-signal that needs transmit.
This shows, the embodiment of the invention use clock frequency with multiplexing after the need data signal mix transmission, make receiving terminal only need a filter: the frequency of pilot signal is low, signal next door thereby not interference, clock frequency signal in the mixed signal is leached the realization easily and simple that becomes, correctly recovered thereby make the xDSL signal to be transmitted in receiving terminal by optical fiber; Solved carry out multichannel xDSL signal multiplexing the same frequency homophase problem of subcarrier frequency during demultiplexing.
Description of drawings
Fig. 1 is a prior art xDSL system reference model schematic diagram;
Fig. 2 is prior art DSL over Fiber system reference model one schematic diagram;
Fig. 3 is prior art DSL over Fiber system reference model two schematic diagrames;
Fig. 4 A is the schematic diagram of the shared spectral bandwidth of each road DSL signal of prior art;
Fig. 4 B is that prior art is with the schematic diagram of clock frequency frequency multiplication to subcarrier frequency;
Fig. 4 C is the schematic diagram that prior art becomes multichannel DSL signal frequency division multiplexing one road signal;
Channel subcarrier spectrum diagram when Fig. 5 A is prior art DSL over Fiber transmitting optical signal;
Data channel spectrum diagram when Fig. 5 B is prior art DSL over Fiber transmitting optical signal;
Fig. 6 is an embodiment of the invention principle schematic;
Fig. 7 is an embodiment of the invention device structure schematic block diagram;
Fig. 8 is an embodiment of the invention method flow schematic diagram.
Embodiment
In the embodiment of the invention, at transmitting terminal, with clock frequency and multiplexing after multichannel xDSL signal between be plugged together, form a mixed signal, convert this mixed signal to light signal and be sent to remote terminal by optical fiber; At receiving terminal, by filter clock frequency is leached, and this clock frequency frequency multiplication is obtained subcarrier signal, use this subcarrier signal to recover each road xDSL signal that original need transmit.
Below in conjunction with accompanying drawing, specify by embodiment:
Shown in Fig. 6,8, method embodiment of the present invention is specially:
With the DSL couple in multiplexer (Digital Subscriber Line Access Multiplexer is an example to the down direction that user MODEM sends data DSLAM), and the method for utilizing optical fiber transmission xDSL signal be described:
At transmitting terminal, it is the DSLAM end, as Fig. 2, shown in 3, utilize clock frequency (the Clock Frequency of multiplexing conversion equipment self, Fc) by multiplier or contain phase-locked loop (Phase LockedLogic, the device frequency multiplication of frequency synthesizer PLL) or similar functions forms subcarrier signals to a plurality of subcarrier frequencies, wherein the number of subcarrier frequency is corresponding with the number of the xDSL signal that needs transmission.
The subcarrier signal of gained offers xDSL modulation usefulness after this frequency multiplication, is about to multichannel xDSL signal and subcarrier signal and modulates one to one;
Multichannel xDSL signal after the modulation is carried out frequency division multiplexing, and (Frequency DomainMultiplexing FDM) forms one road signal;
Clock frequency is inserted in the signal after multiplexing, forms mixed signal, become light signal to send in the optical fiber via opto-electronic conversion again and send out;
At receiving terminal, promptly remote terminal converts the light signal that receives to the signal of telecommunication, with filter clock frequency signal is leached, and to this clock frequency frequency multiplication, obtains the subcarrier signal with xDSL signal way equal number; Utilize this subcarrier signal to recover initial data, be transferred to user's MODEM again by twisted-pair feeder.Wherein, the present invention does not limit concrete filtering, frequency multiplication and initial data restoration methods.
Corresponding to method embodiment, the embodiment of the invention also provides the embodiment that utilizes optical fiber to transmit the xDSL signal receiving/transmission device.As shown in Figure 7, this device embodiment is specially:
Comprise receiving equipment and transmitting apparatus, wherein,
Transmitting apparatus comprises: frequency multiplication unit 111, modulating unit 110, Multiplexing Unit 114, mixed cell 112 and transmitting terminal light Transmit-Receive Unit 113;
The xDSL signal that the subcarrier signal that modulating unit 110 utilizes the frequency multiplication unit to send here will need to transmit utilizes frequency multiplexing technique to modulate, and the xDSL signal after will modulating sends to Multiplexing Unit 114;
Multichannel xDSL signal after the modulation that Multiplexing Unit 114 sends modulating unit 110 carries out frequency division multiplexing, forms one tunnel xDSL signal after multiplexing, sends mixed cell 112 to;
Mixed cell 112 is inserted in clock frequency signal in the xDSL signal after multiplexing and forms mixed signal, and sends transmitting terminal light Transmit-Receive Unit 113 to;
Transmitting terminal light Transmit-Receive Unit 113 converts the mixed signal of being received to light signal, and sends.
Receiving equipment comprises: receiving terminal light Transmit-Receive Unit 211, filter 221, frequency multiplication unit 222 and demodulating unit 212;
Wherein receiving terminal light Transmit-Receive Unit 211 light signal that is used for receiving converts the signal of telecommunication to, and is sent to filter 221;
The clock frequency frequency multiplication that frequency multiplication unit 222 is used for leaching is to subcarrier frequency, and the number of subcarrier signal is identical with the way of the DSL signal that needs to transmit, and sends subcarrier signal to demodulating unit 212;
Demodulating unit 212 can be a plurality of unit with demodulation function, also can be a demodulating unit independently, and this demodulating unit 212 recovers the initial data of xDSL signal according to this subcarrier signal.
The present invention also provides the dispensing device that utilizes the optical fiber data signal and the embodiment of receiving system.This device embodiment is specially:
Utilize the dispensing device of optical fiber data signal to comprise as shown in Figure 7: frequency multiplication unit 111, modulating unit 110, Multiplexing Unit 114, mixed cell 112 and light Transmit-Receive Unit 113;
The xDSL signal that the subcarrier signal that modulating unit 110 utilizes the frequency multiplication unit to send here will need to transmit is modulated, and the xDSL signal after will modulating sends to Multiplexing Unit 114;
Multichannel xDSL signal after Multiplexing Unit 114 will be modulated carries out frequency division multiplexing, forms one road signal, and sends to mixed cell 112;
Transmitting terminal light Transmit-Receive Unit 113 converts the mixed signal of being received to light signal, and sends.
As shown in Figure 7, utilize the receiving system of optical fiber data signal to comprise: light Transmit-Receive Unit 211, filter 222, frequency multiplication unit 221 and demodulating unit 212;
Wherein light Transmit-Receive Unit 211 light signal that is used for receiving converts the signal of telecommunication to, and is sent to filter 222;
The clock frequency frequency multiplication that frequency multiplication unit 221 is used for leaching is to subcarrier frequency, and the number of subcarrier frequency is identical with the number of the xDSL signal that needs to transmit, and the subcarrier signal that frequency multiplication is obtained sends demodulating unit 212 to;
Demodulating unit 212 recovers the initial data of each road xDSL signal of needs transmission according to this subcarrier signal.
According to the above, the embodiment of the invention is by being inserted into clock frequency in the xDSL signal after multiplexing, the formation mixed signal sends, receiving terminal leaches clock frequency signal after receiving this mixed signal, and with this clock frequency frequency multiplication that leaches, obtain subcarrier signal, utilize subcarrier signal to recover the xDSL signal method that original needs transmit, make the filter of receiving terminal only need one: the frequency of pilot signal is low, signal next door thereby do not disturb the clock signal in the mixed signal leached to become and realize easily and simple.Thereby making the xDSL signal to be transmitted in receiving terminal by optical fiber is correctly recovered; Solved carry out multichannel xDSL signal multiplexing the same frequency homophase problem of subcarrier frequency during demultiplexing.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with the people of this technology in the disclosed technical scope of the present invention; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.
Claims (14)
1. a method of utilizing the optical fiber data signal is characterized in that, comprise,
In transmitting terminal is inserted in clock frequency data-signal after multiplexing, form mixed signal, and send to receiving terminal by optical fiber;
At receiving terminal the mixed signal that receives is carried out filtering, obtain clock frequency;
To subcarrier frequency, utilize this subcarrier frequency need to recover the data-signal of transmission this clock frequency frequency multiplication.
2. the method for utilizing the optical fiber data signal as claimed in claim 1 is characterized in that:
In the data-signal that clock frequency is inserted in after multiplexing, form before the mixed signal, also comprise step: with clock frequency Fc frequency multiplication to subcarrier frequency formation subcarrier signal.
3. the method for utilizing the optical fiber data signal as claimed in claim 1 or 2 is characterized in that, forms before the mixed signal in the data-signal that clock frequency is inserted in after multiplexing, also comprises step:
Data-signal and subcarrier signal that needs transmit are modulated one to one; And the signal after this modulation carried out frequency division multiplexing.
4. the method for utilizing the optical fiber data signal as claimed in claim 1 or 2 is characterized in that:
Described data-signal is the xDSL signal.
5. R-T unit that utilizes the optical fiber data signal is characterized in that:
Comprise transmitting apparatus and receiving equipment;
Wherein, described transmitting apparatus comprises:
Mixed cell is used for the data-signal that clock frequency is inserted into after multiplexing is formed mixed signal;
Transmitting terminal light Transmit-Receive Unit is used to receive the signal of described mixed cell output, and should mixed conversion of signals was that light signal sends;
Described receiving equipment comprises:
The frequency multiplication unit is used for clock frequency is carried out frequency multiplication, obtains subcarrier signal;
Demodulating unit is used to utilize the subcarrier signal of frequency multiplication unit output to recover the data-signal that needs transmit.
6 R-T units that utilize the optical fiber data signal as claimed in claim 5 is characterized in that described transmitting apparatus also comprises:
The frequency multiplication unit is used for clock frequency Fc frequency multiplication is formed subcarrier signal to subcarrier frequency;
Modulating unit, the subcarrier signal that is used to utilize described frequency multiplication unit to send is modulated the data-signal that needs transmit; Multiplexing Unit is used for the data-signal after the modulation is carried out frequency division multiplexing.
7 as claim 5 or the 6 described R-T units that utilize the optical fiber data signal, it is characterized in that described receiving equipment also comprises:
Receiving terminal light Transmit-Receive Unit, the light signal that is used for receiving converts the signal of telecommunication to;
Filter is used for the signal of telecommunication after the described conversion is carried out filtering, obtains clock frequency.
8. a dispensing device that utilizes the optical fiber data signal is characterized in that, comprising:
Mixed cell is used for the data-signal that clock frequency is inserted into after multiplexing is formed mixed signal;
Transmitting terminal light Transmit-Receive Unit is used to receive the signal of described mixed cell output, and should mixed conversion of signals was that light signal sends.
9. the dispensing device that utilizes the optical fiber data signal as claimed in claim 8 is characterized in that, also comprises:
The frequency multiplication unit is used for clock frequency Fc frequency multiplication is formed subcarrier signal to subcarrier frequency;
Modulating unit, the subcarrier signal that is used to utilize described frequency multiplication unit to send is modulated the data-signal that needs transmit;
Multiplexing Unit is used for the data-signal after the modulation is carried out frequency division multiplexing.
10. a receiving system that utilizes the optical fiber data signal is characterized in that, comprising:
The frequency multiplication unit is used for clock frequency is carried out frequency multiplication, obtains subcarrier signal;
Demodulating unit is used to utilize the subcarrier signal of frequency multiplication unit output to recover the data-signal that needs transmit.
11. the receiving system that utilizes optical fiber to send data-signal as claimed in claim 10 is characterized in that, also comprises:
The light Transmit-Receive Unit, the light signal that is used for receiving converts the signal of telecommunication to;
Filter is used for the signal of telecommunication after the described conversion is carried out filtering, obtain clock signal and multiplexing after data-signal.
12. a system that utilizes the optical fiber data signal comprises transmitting apparatus, receiving equipment and is connected transmitting apparatus and the optical fiber of receiving equipment, it is characterized in that described transmitting apparatus comprises:
Mixed cell is used for the data-signal that clock frequency is inserted into after multiplexing is formed mixed signal;
Transmitting terminal light Transmit-Receive Unit is used to receive the signal of described mixed cell output, and should mixed conversion of signals was that light signal sends;
Described receiving equipment comprises:
The frequency multiplication unit is used for clock frequency is carried out frequency multiplication, obtains subcarrier signal;
Demodulating unit is used to utilize the subcarrier signal of frequency multiplication unit output to recover the data-signal that needs transmit.
13. the system that utilizes the optical fiber data signal as claimed in claim 12 is characterized in that, described transmitting apparatus also comprises:
The frequency multiplication unit is used for clock frequency Fc frequency multiplication is formed subcarrier signal to subcarrier frequency;
Modulating unit, the subcarrier signal that is used to utilize described frequency multiplication unit to send is modulated the data-signal that needs transmit; Multiplexing Unit is used for the data-signal after the modulation is carried out frequency division multiplexing.
14., it is characterized in that described receiving equipment also comprises as claim 12 or the 13 described systems that utilize the optical fiber data signal:
Receiving terminal light Transmit-Receive Unit, the light signal that is used for receiving converts the signal of telecommunication to;
Filter is used for the signal of telecommunication after the described conversion is carried out filtering, obtains clock frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006100637744A CN101001112A (en) | 2006-12-31 | 2006-12-31 | Method, device and system for transmitting data signal using optical fibre |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006100637744A CN101001112A (en) | 2006-12-31 | 2006-12-31 | Method, device and system for transmitting data signal using optical fibre |
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| CN101001112A true CN101001112A (en) | 2007-07-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2006100637744A Pending CN101001112A (en) | 2006-12-31 | 2006-12-31 | Method, device and system for transmitting data signal using optical fibre |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009109116A1 (en) * | 2008-03-04 | 2009-09-11 | 华为技术有限公司 | An optical transmitter and a method for generating optical signal |
| CN101848404A (en) * | 2009-03-27 | 2010-09-29 | 华为技术有限公司 | Synchronizing information transmission method in DSL system, DSL (Digital Subscriber Line) system and equipment |
-
2006
- 2006-12-31 CN CNA2006100637744A patent/CN101001112A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009109116A1 (en) * | 2008-03-04 | 2009-09-11 | 华为技术有限公司 | An optical transmitter and a method for generating optical signal |
| CN101848404A (en) * | 2009-03-27 | 2010-09-29 | 华为技术有限公司 | Synchronizing information transmission method in DSL system, DSL (Digital Subscriber Line) system and equipment |
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Open date: 20070718 |