CN1305276A - Transmission method of grading multidimensional frequency in optical fiber communication - Google Patents
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- CN1305276A CN1305276A CN01108014A CN01108014A CN1305276A CN 1305276 A CN1305276 A CN 1305276A CN 01108014 A CN01108014 A CN 01108014A CN 01108014 A CN01108014 A CN 01108014A CN 1305276 A CN1305276 A CN 1305276A
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Abstract
A hierarchical multi-frequency transmission method for optical fibre communication features that the multiple signal frequencies to be transmitted are modulated to pointed frequency axle, pointed frequency layers and pointed frequency, by hierarchical modulation method. The modulated subcarrier is modulated to optical carrier directly or via A/D converter by laser modulator for transmission. At receiving terminal, the D/A converter, linear brancher, frequency selecting amplifier, detector and filter and used to obtain original signals.
Description
The present invention is a kind of method of utilizing the generating multi-dimension hierarchical frequency to transmit multiple signals in optical fiber, be about to a plurality of data to be modulated (signal frequency) are modulated to respectively on specified frequency axle, frequency level and the assigned frequency through the level modulation that repeats, through linear superposition, constitute the generating multi-dimension hierarchical FM wave, through the optical fiber bidirectional transmission, pass through linear branch again, choosing is put, detection filter, and each data separating is come out.
Several epoch have been experienced in the development of optical fiber telecommunications system, and speed is from 44Mbps in 1976, and the about 10km of transmission range develops into present tens ofly to hundreds of Gbps, and transmission range reaches thousands of km.Optical Fiber Transmission had become the main means of current communication, particularly trunk communication already.At present, the development in this field is all attached great importance in countries in the world, and China is starting the research and development base of the optical fiber telecommunications system in Wuhan and Guangzhou, prepares the billions of optical valleys of building China to tens billion of units of investment.
Optical fiber has huge effective bandwidth, and characteristics such as low-loss, low chromatic dispersion and wide guided wave are arranged, and he has two loss minimums, one near 1.3 μ m, one near 1.5 μ m.At 1.5 mu m wavebands, he approximately provides the bandwidth of 25THz.Yet the bit rate of current optical device is also lower, and the bandwidth of laser, external modulator, switch and detector is no more than 100GHz at most, and the bit rate of in fact current real data link is no more than 10Gbps to each channel.In order to make full use of the effective bandwidth that optical fiber provides, people have designed the use of multiple multiplexing method increase to fiber bandwidth, and multiplexing method commonly used has time division multiplexing (TDM), wavelength division multiplexing (WDM), subcarrier multiplexing (SCM), code division multiplexing (CDM) and space division multiplexing (SDM) etc.Particularly WDM and SCM and this invention have close getting in touch, WDM is meant that the wave band that fibre loss is lower carries out segmentation again, become the channel of a plurality of baseband modulation, N different wavelength of laser device all is operated on the lower Gb/s speed, the transmission rate of whole system then is N a times of single laser transmission rate, lists in single baseband modulation channel and can also comprise one group lower time-multiplexed channel.Wavelength division multiplexing has good prospect to solving digital optical.Simulated light communication also had very good prospect, particularly to solving CATV message transmission, video distribution and every path channels speed much larger than the Local Area Network of 1Gb/s and the interface of PCS Personal Communications System.The essence of SCM is exactly to use up all modulation (demodulation) that realize, multiplexing (demultiplexing) and routing function originally, and to change electricity consumption into and realize.He is not that the base band data with per second hundred megabits directly is modulated on the light carrier of about THz, but baseband signal at first is modulated on the GHz subcarrier, again sub-carrier modulation to the light carrier of THz.The powerful advantages of subcarrier multiplexing is to transmit multiplex (MUX) with laser, and each channel transmits on subcarrier frequency separately, i.e. frequency division multiplexing (FDM).The advantage of this frequency division multiplexing mode is that the optics of a costliness can allow multichannel use simultaneously.And shortcoming be share all channels of laser must be very approaching, in addition, because the limited bandwidth of laser transmitters and receiver, there are very big restriction in the transmission rate of individual channel and total channel number.At present, moderate opto-electronic device bandwidth also surpasses 100MHz, therefore has been difficult to laser of many 100MHz Channel Sharing, and the transmission of each channel being implemented GHz is unpractical.Though we can mark off several channels on the 100MHz bandwidth, channel distribution must be many more, and channel width is just narrow more, and transmission rate is low more.
Purpose of the present invention is a kind ofly utilized generating multi-dimension hierarchical frequency (channel) technology with regard to providing with regard to single channel, under the prerequisite that keeps high bandwidth and high transfer rate, increase substantially the transmission of Information ability, make full use of the transmission method of the middle-level multi-dimension frequency of optical fiber communication of bandwidth of an optical fiber.
The solution of the present invention is to adopt the method for level modulation with the successively modulation of a plurality of signal frequencies waiting for transmission through repeating, be modulated to respectively on specified frequency axle, specified frequency level and the specified frequency, again modulated subcarrier directly or through after mould/number conversion is transmitted to light carrier by laser modulation, receiving terminal directly or through behind the D/A switch by the linear branch device, again through restoring original signal with right time frequency-selecting amplification successively and the detection filter of chopping phase.Adopt the level modulator approach will many frequencies to be modulated to be modulated to formation (f on the modulation level of appointment and the specified frequency respectively
1→ f
2→ f
3F
n), be about to several frequency f to be modulated
1(1) to f
1(k
1) with modulator they are modulated on any frequency of corresponding appointment respectively one by one, form the f of ground floor modulation
2(1) to f
2(k
2), the frequency f after will modulating respectively again
2(1) to f
2(k
2) through modulator they are modulated on any frequency of corresponding appointment respectively once more one by one, form the f of second layer modulation
3(1) to f
3(k
3), modulate the f that forms the modulation of n layer through n time level by that analogy
n(1) to f
n(k
n).Frequency f after the modulation
n(j
n) more than or equal to modulated frequency f before the modulation
N-1(j
N-1) 3 times be f
n(j
n) 〉=3f
N-1(j
N-1).The modulator that adopts is amplitude-modulated wave modulator or frequency-modulated wave modulator or phase modulation modulator or the double modulator of transferring of Frequency and Amplitude.Frequency wherein to be modulated has " k " individual, i.e. f
1(1) to f
1(k), j frequency in 1 to k frequency is f
1(j).The frequency of primary frequency n layer modulation is f relatively
n(1) to f
n(k), j frequency is at the modulation result f of n layer
n(j).Its advantage is:
This method makes generating multi-dimension hierarchical frequency (channel) can use the optics of a costliness simultaneously, needs the cost of the optics of a plurality of costlinesses when having saved multiplexing.
Use this method can be under the prerequisite that keeps high bandwidth and high transfer rate, greatly improve the transmission of Information ability, particularly greatly improve under the prerequisite of message transmission capability, re-use the WDM/SCM hybrid system, will more make full use of bandwidth of an optical fiber at the solution single channel.Adopt the message transmission of optical fiber after this technology can be theoretically near unlimited ability.
Subcarrier through multi-level modulation is not the notion of a channel, but the notion of generating multi-dimension hierarchical channel, promptly a subcarrier can be to there being the channel of a lot of levels, and he is under the certain situation of bandwidth, and the information transmitted amount will be very huge.
This method both can be used for the digital light transmission, can be used for the simulated light transmission again, particularly adopt analog optical transmission system, (demodulation), multiplexing (demultiplexing) and Route Selection are modulated in electricity consumption, under present circumstances, electric device is more cheap than optical device, and reliable, electrical filter can be designed as efficiently, the multiple spot filter of near ideal, and optical filter only is a single-pole filter.
This method can be simplified the complicated degree of existing fiber communication equipment and facility greatly, reduce the intensity of communications field infrastructure construction and the input of fund greatly, forming brand-new optical fiber telecommunications system, will be a great breakthrough to the development of quickening IT application process and propulsion information industry.
Fig. 1 is for illustrating the schematic diagram of multi-wavelength, the transmission of generating multi-dimension hierarchical frequencies of light with multilane, multilevel traffic and multi-level vehicle.
Fig. 1 a is not for there being the single channel transmission schematic diagram of optical fiber under erbium-doped fiber amplifier (EDFA) situation.
Fig. 1 b is the non-relay high-speed transfer schematic diagram of single channel that EDFA realizes.
Fig. 1 c is the schematic diagram of the wavelength division multiplexing of Optical Fiber Transmission.
Fig. 1 d is that a plurality of smooth packets stack the schematic diagram a channel.
Fig. 1 e is that multiple beams of optical fiber, a plurality of smooth packet stack the schematic diagram that transmits on the multichannel solid.
Fig. 2 is the schematic diagram of multichannel Frequency Division Multiplexing system.
Fig. 2 a is subcarrier multiplexing (SCM) system schematic (emphasis that the dashed rectangle among the figure need solve for the present invention) of frequency division multiplexing in the optical fiber communication (FDM).
Fig. 2 b is for sending the frequency spectrum of FDM system.
Fig. 3 generating multi-dimension hierarchical frequency organigram.
Fig. 4 is the subcarrier f on frequency axis of k in the m bar frequency axis
Sc, 1, f
Sc, 2... f
Sc, nSimultaneously to data
1, data
2... data
nHandle and 1 of the schematic diagram of analogue transmission.
Fig. 5 is the subcarrier f on frequency axis of k in the m bar frequency axis
Sc, 1, f
Sc, 2..., f
Sc, nSimultaneously to data
1, data
2... data
n2 of the schematic diagram of handling and transmitting.
Fig. 6 is the subcarrier f on frequency axis of k in the m bar frequency axis
Sc, 1, f
Sc, 2... f
Sc, nSimultaneously to data
1, ata
2... data
nHandle schematic diagram with Digital Transmission.
The invention will be further elaborated in conjunction with the accompanying drawings for following examples.
If we regard optical fiber as a highway, regard number Gbps individual channels as on the highway a fast traffic lane, the light packet is regarded as automobile, optical fiber then is highway.Then the present invention then is that (1) will a lot of automobiles stacks together and travels on a fast traffic lane (Fig. 1 d), and optical fiber is become highways three-dimensional, many fast traffic lanes.
As shown in Figure 2, f
Sc, 1, f
Sc, 2... f
Sc, nBe n the subcarrier frequency on single channel, data 1, data 2 ... data n is corresponding modulating f respectively
Sc, 1, f
Sc, 2... f
Sc, n, modulated f
Sc, 1, f
Sc, 2... f
Sc, nWith the individual channel mixing, share a laser.Yet subcarrier can only corresponding data, and he is on the linear one dimension channel axis, only is the use of single-frequency, causes the significant wastage of frequency resource.
Our level modulator approach promptly adopts the level modulator approach that many frequencies to be modulated are modulated to respectively on the modulation level of appointment and the specified frequency and forms (f
1→ f
2→ f
3→ ... f
n), be about to several frequency f to be modulated
1(1) to f
1(k
1) with modulator they are modulated on any frequency of corresponding appointment respectively one by one, form the f of ground floor modulation
2(1) to f
2(k
2), the frequency f after will modulating respectively again
2(1) to f
2(k
2) through modulator they are modulated on any frequency of corresponding appointment respectively once more one by one, form the f of second layer modulation
3(1) to f
3(k
3), modulate the f that forms the modulation of n layer through n-1 time level by that analogy
n(1) to f
n(k
n).Frequency f after the modulation
n(j
n) more than or equal to modulated frequency f before the modulation
N-1(j
N-1) 3 times be f
n(j
n) 〉=3f
N-1(j
N-1).Frequency wherein to be modulated has " k " individual, i.e. f
1(1) to f
1(k), j frequency in 1 to k frequency is f
1(j).The frequency of primary frequency n layer modulation is f relatively
n(1) to f
n(k), j frequency is at the modulation result f of n layer
n(j) (Fig. 3).
Fig. 4 is the framework signal 1 of our scheme, and its step is as follows:
(1) oscillator A and isolator 1, isolator 2 ... isolator n has formed subcarrier f
Sc, 1
(2) oscillator 1 and data
1Formed modulator 1, the output of modulator 1 and oscillator A have formed modulator 2 again, oscillator 2 and data
2Formed modulator 3, the output of modulator 3 and oscillator A have formed modulator 4 again ...
(3) with modulator 2, modulator 4 ..., the output frequency of modulator n carries out linear superposition.
The condition that need to satisfy be oscillator A frequency of oscillation should more than or equal to 3 times modulator 1, modulator 2 ..., the highest frequency exported among the modulator n.
(4) with f
Sc, 1, f
Sc, 2... f
Sc, n, through the frequency of linear superposition, pass through mixer, laser and star coupling device again, enter and the corresponding linear branch device of linear superposition, the signal of linear superposition is handled along separate routes.
(5) frequency selective amplifier 1, frequency selective amplifier 3 ..., frequency selective amplifier m, carry out the frequency-selecting first time, frequency selective amplifier 2, frequency selective amplifier 4 ... frequency selective amplifier n carries out the frequency-selecting second time ..., repeatedly the purpose of frequency-selecting amplification is exactly to increase the effect that frequency-selecting is amplified.
(6) restore data through detection filter
1, data
2..., data
n
The key point of receiving system of the present invention is at receiving terminal utilization " stripper ", the generating multi-dimension hierarchical FM wave is adopted linear the reception, band pass filter (as frequency selective amplifier) is successively peeled off out with the generating multi-dimension hierarchical frequency, after detection filter takes out data (information).
Fig. 5 is the signal 2 of the framework of our scheme, represented n level on the some frequencies on a certain frequency axis in m bar frequency axis the frequency resource level multiplexing method.We can think to utilize to visualization a subcarrier f like this
Sc, 1Transmit data simultaneously
1, data
2... data
n, also can utilize subcarrier f
Sc, 2Transmit data simultaneously
1, data
2... data
n
Above-mentioned subcarrier multiplexing scheme, be to have adopted the simulated light transmission technology, (demodulation), multiplexing (demultiplexing) and Route Selection are modulated in electricity consumption, also this technology and frequency-division multiplexing method can be used in combination, enlarge the transmission of Information amount, and make full use of the bandwidth of an optical fiber resource.Yet Digital Transmission has its exclusive advantage, and the generating multi-dimension hierarchical frequency approach can be used too.
As shown in Figure 6, for data
1, data
2..., data
nBoth can be analog information, also can be numerical data.If data
1, data
2..., data
nBe analog information, can convert numerical data to through analog-to-digital conversion.Illustrated empty frame first increases the generating multi-dimension hierarchical frequency and forms part, with subcarrier f
Sc, 1, f
Sc, 2F
Sc, nAnalog-to-digital conversion is promptly passed through in digitlization, and the laser of sending into separately transmits.At the second portion of empty frame,, carry out information reverting again through digital to analog conversion.Certainly, also can carry out digitlization, transmission, D/A switch, to information reverting to the carrier wave of each level of carrying multi-layer information (analog/digital information).
For two-way up and downlink transfer, just the band segment on the fiber bandwidth is used for uply, band segment is used for descending, and transmitting terminal also is a receiving terminal, if we are considered as up scheme with such scheme, descending scheme is consistent with up scheme then.
In order to prove above-mentioned design, we have carried out the subcarrier f on frequency axis of k in the m bar frequency axis
Sc, 1Simultaneously to data
1, data
2... data
nHandle and transmit prototype design.
The frequency of oscillation that oscillator produces is 1.4MHz, and the frequency of oscillation that oscillator 1, oscillator 2, oscillator 3, oscillator 4 produce is respectively 100KHz, 150KHz, 200KHz, 250KHz.Data
1, data
2, data
3, data
4Be audio signal.
Data
1Being modulated at the last modulating wave that forms of 100KHz is modulated on the 1.4MHz again; Data
2Being modulated at the last modulating wave that forms of 150KHz is modulated on the 1.4MHz again; Data
3Being modulated at the last modulating wave that forms of 200KHz is modulated on the 1.4MHz again; Data
4Being modulated at the last modulating wave that forms of 250KHz is modulated on the 1.4MHz again; 1.4MHz modulating wave all satisfies peaked 3 times in 100KHz, 150KHz, 200KHz, the 250KHz modulating wave.
Again with data
1Be modulated at the last modulating wave that forms of 100KHz and be modulated at modulating wave and the data that 1.4MHz goes up formation again
2Be modulated at the last modulating wave that forms of 150KHz and be modulated at the modulating wave that 1.4MHz goes up formation, data again
3Be modulated at the last modulating wave that forms of 200KHz and be modulated at the modulating wave that 1.4MHz goes up formation again, and data
4The modulating wave that is modulated at the last formation of 250KHz is modulated at the last modulating wave that forms of 1.4MHz again and carries out linear superposition.
1.4MHz subcarrier (1) is directly transmitted to light carrier by laser modulation; (2), transmit to light carrier by laser modulation again with the subcarrier numeralization.
Frequency selective amplifier 1 and frequency selective amplifier 2 carry out the frequency that 100KHz is selected in twice frequency-selecting respectively; Frequency selective amplifier 3 and frequency selective amplifier 4 carry out the frequency that 150KHz is selected in twice frequency-selecting respectively, and frequency selective amplifier 5 and frequency selective amplifier 6 carry out the frequency that 200KHz is selected in twice frequency-selecting respectively; Frequency selective amplifier 7 and frequency selective amplifier 8 carry out the frequency that 250KHz is selected in twice frequency-selecting respectively.(6) the amplitude-modulated wave detection filter of the frequency of the frequency of the frequency of the frequency of 100KHz, 150KHz, 200KHz and 250KHz restores data respectively
1, data
2, data
3And data
4So just finished the transmission course of generating multi-dimension hierarchical frequency in optical fiber.
Claims (4)
1. the transmission method of the middle-level multi-dimension frequency of optical fiber communication, it is characterized in that adopting the method for level modulation with of the successively modulation of a plurality of signal frequencies waiting for transmission through repeating, be modulated to respectively on specified frequency axle, specified frequency level and the specified frequency, again modulated subcarrier directly or through after mould/number conversion is transmitted to light carrier by laser modulation, receiving terminal directly or through behind the D/A switch by the linear branch device, again through restoring original signal with right time frequency-selecting amplification successively and the detection filter of chopping phase.
2. the transmission method of the middle-level multi-dimension frequency of optical fiber communication according to claim 1 is characterized in that the level modulator approach is to adopt the level modulator approach will many frequencies to be modulated to be modulated to formation (f on the modulation level of appointment and the specified frequency respectively
1→ f
2→ f
3→ ... f
n), be about to several frequency f to be modulated
1(1) to f
1(k
1) with modulator they are modulated on any frequency of corresponding appointment respectively one by one, form the f of ground floor modulation
2(1) to f
2(k
2), the frequency f after will modulating respectively again
2(1) to f
2(k
2) through modulator they are modulated on any frequency of corresponding appointment respectively once more one by one, form the f of second layer modulation
3(1) to f
3(k
3), modulate the f that forms the modulation of n layer through n-1 time level by that analogy
n(1) to f
n(k
n), the frequency f after the modulation
n(j
n) more than or equal to modulated frequency f before the modulation
N-1(j
N-1) 3 times be f
n(j
n) 〉=3f
N-1(j
N-1).
3. the transmission method of the middle-level multi-dimension frequency of optical fiber communication according to claim 1 is characterized in that the level demodulation method is to adopt linear reception, bandpass filtering, detection filter, delamination.
4. according to the transmission method of right 1 or the middle-level multi-dimension frequency of 2 described optical fiber communications, it is characterized in that the modulator that is adopted is amplitude-modulated wave modulator or frequency-modulated wave modulator or phase modulation modulator or the double modulator of transferring of Frequency and Amplitude.
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|---|---|---|---|
| CN01108014A CN1305276A (en) | 2001-01-05 | 2001-01-05 | Transmission method of grading multidimensional frequency in optical fiber communication |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN01108014A CN1305276A (en) | 2001-01-05 | 2001-01-05 | Transmission method of grading multidimensional frequency in optical fiber communication |
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| Publication Number | Publication Date |
|---|---|
| CN1305276A true CN1305276A (en) | 2001-07-25 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1604580B (en) * | 2003-09-30 | 2010-09-08 | 朗迅科技公司 | High speed modulation of optical subcarriers |
-
2001
- 2001-01-05 CN CN01108014A patent/CN1305276A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1604580B (en) * | 2003-09-30 | 2010-09-08 | 朗迅科技公司 | High speed modulation of optical subcarriers |
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