CN102916748A - System and method for simultaneously transmitting multiple signals by using mode division multiplexing of multimode optical fiber - Google Patents
System and method for simultaneously transmitting multiple signals by using mode division multiplexing of multimode optical fiber Download PDFInfo
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- CN102916748A CN102916748A CN2012103935859A CN201210393585A CN102916748A CN 102916748 A CN102916748 A CN 102916748A CN 2012103935859 A CN2012103935859 A CN 2012103935859A CN 201210393585 A CN201210393585 A CN 201210393585A CN 102916748 A CN102916748 A CN 102916748A
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Abstract
The invention relates to a system and method for simultaneously transmitting multiple signals by using mode division multiplexing of multimode optical fiber, belonging to an optical fiber communication technology. The system comprises a solid laser, an optical fiber collimator and the like. Light beams emitted from the solid laser contain multiple transverse modes, and high-level modes and low-level modes are in different spatial positions, therefore different modes of laser can be separated and are respectively received by the optical fiber collimator and led out by single mode optical fiber, different signals are modulated to different modes of light, modulated optical signals are then coupled to one multimode optical fiber to be transmitted to a receiving end, and then different modes of light are separated by using an optical fiber coupler and are respectively demodulated to further obtain different signals. The signal and method disclosed by the invention has the characteristics that multiple channels are transmitted by taking different modes as mutually independent channels, so that the transmission capability of the multimode optical fiber is greatly improved. The multimode optical fiber used in the system and method has the advantages of large numerical aperture, easy connection, lower cost of matched devices, large bearing capacity and the like and is suitable for short-distance optical fiber communication.
Description
Technical field
The present invention relates to a kind of mould of multimode fiber that utilizes and divide the multiplexing system and method that transmits simultaneously a plurality of signals, specifically is exactly the System and method for that utilizes the light of different mode to load unlike signal, transmit with multimode fiber.
Background technology
Press what of transmission mode in the optical fiber, optical fiber is divided into monomode fiber and multimode fiber.Monomode fiber can only transmit a pattern, and multimode fiber allows that then the light of different mode transmits on same optical fiber.
Although monomode fiber is more cheap, performance is also good than multimode fiber, fiber optic network still adopts multimode fiber, and its reason is that the characteristic of multimode fiber has just in time satisfied the requirement of network with fibre.With respect to long distance line, the characteristics of fiber optic network are: transmission rate is relatively low; Transmission range is relatively short; Node is many, joint is many, detour is many; Connector, coupler consumption are large; Small scale, unit fiber lengths use number of light sources many.
In above-mentioned fiber optic network, detour means that loss is large more, and the shunt of luminous power can be very frequent at most for node, and this all requires inside of optical fibre that enough large luminous power transmission will be arranged.Than monomode fiber, the optical fiber core diameter of multimode fiber is thick, and numerical aperture is large, can be from the more luminous power of coupling in light source.
Simultaneously, connector in the network, coupler consumption are large, and the monomode fiber passive device is more expensive than multimode fiber, and relatively accurate, franchise is little, operation is convenient and reliable not as the multimode device.Monomode fiber can only use laser (LD) to make light source, and its cost is high more a lot of than the light-emitting diode (LED) that multimode fiber uses.
Secondly, network size is little, and then the unit fiber lengths uses number of light sources many, may the hundreds of kilometer in the main line with a light source, and each network of tens kilometers even several kilometers respectively has independently light source.If network uses monomode fiber adapted laser, the network in general cost can increase substantially.According to statistics, the cost of monomode fiber network is 4 times of multimode fiber.At present, the vertical cavity surface emitting laser of novel cheapness and transceiver module thereof are commercial, and price and LED approach, and the light beam section that it is circular and high modulation rate have just in time compensated the shortcoming of LED, greatly reduce the operating cost of multimode fiber network.
The advantages such as in sum, we can find out, the numerical aperture that multimode fiber has is large, be easy to connect, supporting device cost is lower, and bearer cap is large make it become the first-selection of short distance optical fiber communication.
In multimode fiber, the group velocity difference of different guided modes can cause dispersion (inter-modal dispersion), and inter-modal dispersion has seriously restricted the bandwidth of multimode fiber-distance product value, and then has limited its transmittability.In the optical communication network of reality, we utilize the MIMO(multiple-input and multiple-output) technology can improve its transmittability.
The mode multiplexing technology is a kind of of light path MIMO technology.This technology has utilized multimode fiber can transmit simultaneously the transmission feature of the light of different mode, and different patterns is transmitted multiple signals as separate channel, has improved greatly the transmittability of multimode fiber.Basic principle is at transmitting terminal with the optical signal set of different mode altogether, is coupling in the same root multimode fiber and transmits, at receiving terminal recycling coupler with the light of different mode separately.
The field of transmission mode can represent with a mutually orthogonal family of functions in the multimode fiber.Excite by preference pattern to excite respectively each pattern, and survey respectively each pattern in the orthogonality of receiving terminal utilization field, just can implementation pattern multiplexing.
At present, the Optical multiplexing technology of comparative maturity has wavelength division multiplexing, frequency division multiplexing, space division multiplexings etc. belong to a kind of more novel multiplex technique based on the mode multiplexing of multimode fiber, and it well utilizes multimode fiber can transmit simultaneously this advantage of a plurality of mode signals, greatly improved again simultaneously the transmittability of multimode fiber, compare with traditional Optical multiplexing technology, effectively raise spectrum efficiency, have very large development potentiality.
The current optical fiber transmission delivery signal major part of utilizing is to use wavelength division multiplexing and frequency division multiplexing, divides multiplexing application but not report relevant for mould.
Summary of the invention
For overcoming the deficiencies in the prior art and defective, the present invention proposes a kind of mould of multimode fiber that utilizes and divide the multiplexing system and method that transmits simultaneously a plurality of signals.
Technical scheme of the present invention realizes in the following manner:
A kind of mould of multimode fiber that utilizes divides the multiplexing system of transmitting simultaneously a plurality of signals, comprise solid state laser, optical fiber collimator, monomode fiber, optical modulator, fiber coupler A, B, multimode fiber, optical demodulator, it is characterized in that solid state laser is positioned at before a plurality of optical fiber collimators, each optical fiber collimator is fixed by support, connect a monomode fiber behind each optical fiber collimator, every monomode fiber back connects an optical modulator, each optical modulator is connected to fiber coupler A by monomode fiber, fiber coupler A back connects a root multimode fiber, utilizes fiber coupler A that many monomode fibers and multimode fiber are of coupled connections; The other end of multimode fiber connects fiber coupler B, fiber coupler B back connects many monomode fibers, the number of monomode fiber is corresponding one by one with the number of above-mentioned optical fiber collimator, connect an optical demodulator behind the every monomode fiber, each road monomode fiber is output optical signal after separately optical demodulator carries out optical modulator; Wherein the modulating frequency of optical modulator is corresponding one by one with the frequency, demodulation frequency of optical demodulator.
Described solid state laser is laser diode end-face pump solid laser.
A kind of said system of utilizing is carried out the method that a plurality of signals transmit simultaneously, and step is as follows:
1) the mould division multiplexing system is connected, power supply of solid laser is opened, light power meter is placed on the solid state laser exit portal sentences and detect solid state laser and whether work, show if any luminous power, illustrate that solid state laser is working properly;
2) scanning interferometer is placed between light power meter and the solid state laser, utilize scanning interferometer to measure the laser mode spectrum of the laser that solid state laser sends, afterwards with light power meter with solid state laser axially vertical plane detect different mode laser energy and in the space residing position; Adjust the support of each optical fiber collimator, so that each optical fiber collimator is positioned at the locus place of the laser of variant pattern, the laser of the variant pattern that receives can be input in the different monomode fiber that is connected from each optical fiber collimator like this;
3) remove light power meter from light path, with the power supply opening of optical modulator, each road signal is through being loaded into respectively after the light modulator modulates on the laser of variant pattern;
4) with the power supply opening of optical demodulator, the laser of the variant pattern of load signal is transferred to fiber coupler A through monomode fiber, be coupled to a root multimode fiber by fiber coupler A and carry out again the signal transmission, after being transferred to the other end of multimode fiber, recycling fiber coupler B separates the light wave of these different modes, carry out demodulation by demodulator respectively, obtained different signals, so just can utilize mould to divide multiplexing a plurality of signals that transmit simultaneously.
The present invention at first utilizes scanning interferometer to measure the laser mode spectrum of the laser that laser diode end-face pump solid laser sends, and determine the energy of different mode laser with light power meter, axially vertical plane detecting the locus of the light of different mode with light power meter with solid state laser afterwards, the light collimater is placed on these positions, optical fiber collimator is input to the light of different mode respectively in the different monomode fibers, utilize optical modulator to modulate the signal on the laser, utilize fiber coupler A that these laser coupled are transmitted in multimode fiber, with fiber coupler B the light of different mode is separated after passing to receiving terminal, and be input in the different monomode fibers, demodulation is out from the light of different mode with different signals to utilize optical demodulator.
Detection principle of the present invention is as follows: the laser that solid state laser sends has various modes, and the low-order and high-order transverse mode of laser has different distributions in the space, and we can utilize these characteristics that the separation by laser of different mode is come.With the laser of different mode separately after, different signals is got on through the laser that optical modulator is added to different mode, then with the laser coupled of these patterns in a root multimode fiber, such root multimode fiber just can transmit a plurality of information simultaneously.After light signal is delivered to receiving terminal, again with optical coupler will carry different information different mode light separately, respectively with different signal demodulation out, divide multiplexing with regard to the mould of having realized multimode fiber so again.
The present invention has following characteristics: different patterns is transmitted multiple signals as separate channel, improved greatly the transmittability of multimode fiber; As light source, cost is low with LED for multimode fiber; The advantages such as the numerical aperture that multimode fiber has is large, be easy to connect, supporting device cost is lower, and bearer cap is large are fit to short-range optical fiber communication.
Description of drawings
Fig. 1 is the structural representation of multimode fiber mould division multiplexing system of the present invention.
Wherein, 1. solid state laser, 2. optical fiber collimator, 3. monomode fiber, 4. optical modulator, 5. fiber coupler A, 6. multimode fiber, 7. fiber coupler B, 8. monomode fiber, 9. optical demodulator.
Embodiment
The present invention will be further described below in conjunction with drawings and Examples, but be not limited to this.
Embodiment 1:
The embodiment of the invention 1 as shown in Figure 1, a kind of mould of multimode fiber that utilizes divides the multiplexing system of transmitting simultaneously a plurality of signals, comprise solid state laser 1, optical fiber collimator 2, monomode fiber 3,8, optical modulator 4, fiber coupler A(5), B(7), multimode fiber 6, optical demodulator 9, it is characterized in that solid state laser 1 is positioned at before a plurality of optical fiber collimators 2, each optical fiber collimator 2 is fixed by support, connect a monomode fiber 3 behind each optical fiber collimator 2, every monomode fiber 3 back connect an optical modulator 4, each optical modulator 4 is connected to fiber coupler A(5 by monomode fiber), fiber coupler A (5) back connects a root multimode fiber 6, utilizes fiber coupler A (5) that many monomode fibers and multimode fiber 6 are of coupled connections; The other end of multimode fiber 6 connects fiber coupler B (7), fiber coupler B (7) back connects many monomode fibers 8, the number of monomode fiber 8 is corresponding one by one with the number of above-mentioned optical fiber collimator 2, connect an optical demodulator 9 behind the every monomode fiber 8, each road monomode fiber 8 is output optical signal after separately optical demodulator 9 carries out optical modulator; Wherein the modulating frequency of optical modulator 4 is corresponding one by one with the frequency, demodulation frequency of optical demodulator 9.
Described solid state laser 1 is laser diode end-face pump solid laser.
Embodiment 2:
1) the mould division multiplexing system is connected, power supply of solid laser is opened, light power meter is placed on the solid state laser exit portal sentences and detect solid state laser and whether work, show if any luminous power, illustrate that solid state laser is working properly;
2) scanning interferometer is placed between light power meter and the solid state laser, utilize scanning interferometer to measure the laser mode spectrum of the laser that solid state laser sends, afterwards with light power meter with solid state laser axially vertical plane detect different mode laser energy and in the space residing position; Adjust the support of each optical fiber collimator, so that each optical fiber collimator is positioned at the locus place of the laser of variant pattern, the laser of the variant pattern that receives can be input in the different monomode fiber that is connected from each optical fiber collimator like this;
3) remove light power meter from light path, with the power supply opening of optical modulator, each road signal is through being loaded into respectively after the light modulator modulates on the laser of variant pattern;
4) with the power supply opening of optical demodulator, the laser of the variant pattern of load signal is transferred to fiber coupler A through monomode fiber, be coupled to a root multimode fiber by fiber coupler A and carry out again the signal transmission, after being transferred to the other end of multimode fiber, recycling fiber coupler B separates the light wave of these different modes, carry out demodulation by demodulator respectively, obtained different signals, so just can utilize the mould division multiplexing system to transmit simultaneously a plurality of signals.
Claims (3)
1. one kind is utilized the mould of multimode fiber to divide the multiplexing system of transmitting simultaneously a plurality of signals, comprise solid state laser, optical fiber collimator, monomode fiber, optical modulator, fiber coupler A, B, multimode fiber, optical demodulator, it is characterized in that solid state laser is positioned at before a plurality of optical fiber collimators, each optical fiber collimator is fixed by support, connect a monomode fiber behind each optical fiber collimator, every monomode fiber back connects an optical modulator, each optical modulator is connected to fiber coupler A by monomode fiber, fiber coupler A back connects a root multimode fiber, utilizes fiber coupler A that many monomode fibers and multimode fiber are of coupled connections; The other end of multimode fiber connects fiber coupler B, fiber coupler B back connects many monomode fibers, the number of monomode fiber is corresponding one by one with the number of above-mentioned optical fiber collimator, connect an optical demodulator behind the every monomode fiber, each road monomode fiber is output optical signal after separately optical demodulator carries out optical modulator; Wherein the modulating frequency of optical modulator is corresponding one by one with the frequency, demodulation frequency of optical demodulator.
2. a kind of mould of multimode fiber that utilizes as claimed in claim 1 divides the multiplexing system of transmitting simultaneously a plurality of signals, it is characterized in that described solid state laser is laser diode end-face pump solid laser.
3. one kind is utilized the described system of claim 1 to carry out the method that a plurality of signals transmit simultaneously, and step is as follows:
1) the mould division multiplexing system is connected, power supply of solid laser is opened, light power meter is placed on the solid state laser exit portal sentences and detect solid state laser and whether work, show if any luminous power, illustrate that solid state laser is working properly;
2) scanning interferometer is placed between light power meter and the solid state laser, utilize scanning interferometer to measure the laser mode spectrum of the laser that solid state laser sends, afterwards with light power meter with solid state laser axially vertical plane detect different mode laser energy and in the space residing position; Adjust the support of each optical fiber collimator so that each optical fiber collimator is positioned at the locus place of the laser of variant pattern, the laser that receives variant pattern can be input to like this from different monomode fiber that each optical fiber collimator is connected in;
3) remove scanning interferometer and light power meter from light path, with the power supply opening of optical modulator, each road signal is through being loaded into respectively after the light modulator modulates on the laser of variant pattern;
4) with the power supply opening of optical demodulator, the laser of the variant pattern of load signal is transferred to fiber coupler A through monomode fiber, be coupled to a root multimode fiber by fiber coupler A and carry out again the signal transmission, after being transferred to the other end of multimode fiber, recycling fiber coupler B separates the light wave of these different modes, carry out demodulation by demodulator respectively, obtained different signals, so just finished and utilized mould to divide multiplexing a plurality of signals that transmit simultaneously.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012103935859A CN102916748A (en) | 2012-10-16 | 2012-10-16 | System and method for simultaneously transmitting multiple signals by using mode division multiplexing of multimode optical fiber |
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| CN2012103935859A CN102916748A (en) | 2012-10-16 | 2012-10-16 | System and method for simultaneously transmitting multiple signals by using mode division multiplexing of multimode optical fiber |
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Cited By (2)
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| WO2016106594A1 (en) * | 2014-12-30 | 2016-07-07 | 华为技术有限公司 | Data transmission method, apparatus and system |
| CN108761672A (en) * | 2018-07-29 | 2018-11-06 | 广东瑞谷光网通信股份有限公司 | The double luminous road systems of double receipts of single fiber |
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Cited By (4)
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| CN108761672B (en) * | 2018-07-29 | 2024-02-27 | 广东瑞谷光网通信股份有限公司 | Double-receiving double-light-emitting path system of single optical fiber |
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Application publication date: 20130206 |