CN105515679A - Double-output electro absorption modulator (EAM) based coherent optical network unit (ONU) and method thereof for realizing single fiber bidirectional transmission - Google Patents
Double-output electro absorption modulator (EAM) based coherent optical network unit (ONU) and method thereof for realizing single fiber bidirectional transmission Download PDFInfo
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- CN105515679A CN105515679A CN201510870022.8A CN201510870022A CN105515679A CN 105515679 A CN105515679 A CN 105515679A CN 201510870022 A CN201510870022 A CN 201510870022A CN 105515679 A CN105515679 A CN 105515679A
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 42
- 230000001427 coherent effect Effects 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 26
- 239000000835 fiber Substances 0.000 title claims abstract description 14
- 238000010521 absorption reaction Methods 0.000 title claims abstract description 12
- 230000003287 optical effect Effects 0.000 title abstract description 11
- 230000002457 bidirectional effect Effects 0.000 title abstract 2
- 238000011084 recovery Methods 0.000 claims abstract description 6
- 239000013307 optical fiber Substances 0.000 claims abstract description 5
- 230000009977 dual effect Effects 0.000 claims description 44
- 230000009514 concussion Effects 0.000 claims description 22
- 238000001514 detection method Methods 0.000 abstract description 9
- 238000010276 construction Methods 0.000 abstract description 3
- 230000010355 oscillation Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
Classifications
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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
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/64—Heterodyne, i.e. coherent receivers where, after the opto-electronic conversion, an electrical signal at an intermediate frequency [IF] is obtained
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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
- H04B10/27—Arrangements for networking
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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
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/615—Arrangements affecting the optical part of the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
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- Computing Systems (AREA)
- Optical Communication System (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The invention discloses a double-output electro absorption modulator (EAM) based coherent optical network unit (ONU) and a method thereof for realizing signal fiber bidirectional transmission. The method comprises the steps that the strength of an uplink signal is modulated by a double-output EAM, and the uplink signal is output by a first output port of the double-output EAM; a second output port outputs a local oscillation (LO) light source; a downlink signal is transmitted to a coherent receiver through an optical fiber; the coherent receiver performs coherent heterodyne detection on the downlink signal by use of the LO light source; and a digital signal processing chip performs digital recovery processing on an I path of signal and a Q path of signal obtained through coherent heterodyne detection by use of a coherent digital envelope detection algorithm. Through adoption of the method, the double-output EAM can realize uplink modulation and downlink receiving simultaneously, the coherent digital envelope detection algorithm is adopted for digital recovery processing, so that the impact of large light source ray width and frequency jitter of the double-output EAM on signal quality is overcome. The double-output EAM has low cost, small size and low power consumption, and lowers the construction cost of a coherent passive optical network.
Description
Technical field
The present invention relates to relevant EPON field, be specifically related to based on dual output EAM (ElectroAbsorptionModulator, electroabsorption modulator) relevant ONU (OpticalNetworkUnit, optical network unit) and realize single fiber bi-directional transmission method.
Background technology
Coherent optical communication mainly utilizes coherent modulation and heterodyne Detection Technique, have highly sensitive, repeater span is long, the advantage such as the good and message capacity of selectivity is large, based on the relevant detection (demodulation mechanism of signal, compared with direct-detection, relevant detection more easily obtains large signal to noise ratio, recoverable signal kinds is more, and frequency selectivity is better) passive optical network i.e. relevant passive optical network, there is power budget large, high and the passage of access rate is the advantage such as adjustable flexibly, and based on the ONU i.e. relevant ONU of relevant detection, as the important component part of relevant passive optical network, its cost is the key factor of the relevant passive optical network of impact.
At present, relevant passive optical network requires single fiber bi-directional transmission, namely to realize transmission that is up and downstream signal at same optical fiber simultaneously, and traditional relevant ONU is up is connected to central office by GEPON port, lower behavior personal user or SOHO user provide 1 tunnel gigabit Etherenet network interface, single fiber bi-directional transmission cannot be realized, in addition, because the price comparison of narrow linewidth single-longitudinal-mode fiber laser (can ensure that laser has fabulous coherence) is expensive, for cost consideration, relevant passive optical network is difficult to accept expensive narrow linewidth laser and external modulation technology.
In view of this, need to carry out architecture advances to existing relevant ONU, meet the demand of single fiber bi-directional transmission, thus reduce the construction cost of relevant EPON.
Summary of the invention
Technical problem to be solved by this invention is the problem that existing relevant ONU cannot realize single fiber bi-directional transmission.
In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is to provide a kind of relevant ONU based on dual output EAM, comprises coherent receiver, dual output electroabsorption modulator and digital signal processing chip,
After upward signal carries out intensity modulated by described dual output electroabsorption modulator, export through its first delivery outlet, meanwhile, its second delivery outlet exports this locality concussion light source LO being used for relevant Heterodyne detect;
Downstream signal transfers to described coherent receiver, and described coherent receiver utilizes described this locality concussion light source LO to carry out relevant Heterodyne detect to described downstream signal;
Described digital signal processing chip carries out digital Recovery processing by coherent digital envelope detected algorithm to the I road signal of relevant Heterodyne detect gained and Q road signal.
In technique scheme, described dual output electroabsorption modulator comprises DBR active area, Part I transmission DBR speculum, electro-absorption modulation district, electrode, the first lens, Part II transmission DBR speculum and the second lens,
Described DBR active area excites and produces continuous light wave, and wherein a part of light wave is through described Part II transmission DBR speculum and described second lens focus, exports as described this locality concussion light source LO;
Another part light wave exports described electro-absorption modulation district to through described Part I transmission DBR speculum, and modulated current is loaded on light carrier through described electrode, finally by described first lens focus, exports as described upward signal.
In technique scheme, described digital signal processing chip is by described I road signal and described Q road signal combination, form (I+j × Q) complex signal, described (I+j × Q) complex signal can be expressed as: I+j × Q=A (n) × exp (2 π j Δ fn+ θ (n)); Wherein, A (n) represents strength signal, and described A (n) is by obtaining described (I+j × Q) complex signal delivery, and described A (n) just can recover transmission information after decision-making judgement; Δ f represents the frequency-splitting of relevant Heterodyne detect, and θ (n) represents Light source line width, and j represents the square root of-1, and n represents sampled point index.
In technique scheme, the wavelength of described upward signal is equal with the wavelength that light source LO is shaken in described this locality.
In technique scheme, the frequency-splitting between described this locality concussion light source LO and described downstream signal is greater than signal bandwidth.
Present invention also offers a kind of method that relevant ONU based on dual output EAM realizes single fiber bi-directional transmission, comprise the following steps:
After upward signal carries out intensity modulated by dual output electroabsorption modulator, the first delivery outlet through described dual output electroabsorption modulator exports;
Second delivery outlet of described dual output electroabsorption modulator exports this locality concussion light source LO being used for relevant Heterodyne detect;
Downstream signal through Optical Fiber Transmission to coherent receiver;
Described coherent receiver utilizes described this locality concussion light source LO to carry out relevant Heterodyne detect to described downstream signal, and exports the I road signal obtained and Q road signal to digital signal processing chip;
Described digital signal processing chip is processed described I road signal and described Q road signal by coherent digital envelope detected algorithm, recovers described downstream signal.
In technique scheme, described dual output electroabsorption modulator comprises DBR active area, Part I transmission DBR speculum, electro-absorption modulation district, electrode, the first lens, Part II transmission DBR speculum and the second lens,
Described DBR active area excites and produces continuous light wave, and wherein a part of light wave is through described Part II transmission DBR speculum and described second lens focus, exports as described this locality concussion light source LO;
Another part light wave exports described electro-absorption modulation district to through described Part I transmission DBR speculum, and modulated current is loaded on light carrier through described electrode, finally by described first lens focus, exports as described upward signal.
In technique scheme, the concrete steps of described coherent digital envelope detected algorithm are:
Described digital signal processing chip is by described I road signal and described Q road signal combination, form (I+j × Q) complex signal, described (I+j × Q) complex signal can be expressed as: I+j × Q=A (n) × exp (2 π j Δ fn+ θ (n)); Wherein, A (n) represents strength signal, Δ f represents the frequency-splitting of relevant Heterodyne detect, θ (n) represents Light source line width, j represents the square root of-1, n represents sampled point index, obtains described A (n) to described (I+j × Q) complex signal delivery, and described A (n) just can recover transmission information after decision-making judgement.
In technique scheme, the wavelength of described upward signal is equal with the wavelength that light source LO is shaken in described this locality.
In technique scheme, the frequency-splitting between described this locality concussion light source LO and described downstream signal is greater than signal bandwidth.
Relevant ONU based on dual output EAM provided by the invention and realize single fiber bi-directional transmission method, up modulation and downlink reception can be met by dual output electroabsorption modulator simultaneously, simultaneously, by coherent digital envelope detected algorithm, digital Recovery processing is carried out to downstream signal, greatly overcome the comparatively large and frequency jitter of dual output electroabsorption modulator Light source line width to the impact of signal quality, dual output electroabsorption modulator with low cost, size is little, low in energy consumption, reduce the construction cost of relevant EPON.
Accompanying drawing explanation
The structured flowchart of the relevant ONU based on dual output EAM that Fig. 1 provides for the embodiment of the present invention;
The fundamental diagram of the relevant ONU based on dual output EAM that Fig. 2 provides for the embodiment of the present invention;
The schematic diagram of the dual output electroabsorption modulator that Fig. 3 provides for the embodiment of the present invention;
The digital signal processing chip that Fig. 4 provides for the embodiment of the present invention carries out the digital flow chart recovered by coherent digital envelope detected algorithm to downstream signal;
Fig. 5 realizes the method flow diagram of single fiber bi-directional transmission for a kind of relevant ONU based on dual output EAM that the embodiment of the present invention provides.
Embodiment
Below in conjunction with specification drawings and specific embodiments, the present invention is described in detail.
Embodiments provide a kind of relevant ONU based on dual output EAM, as shown in Figure 1, comprise dual output electroabsorption modulator 10, coherent receiver 20 and digital signal processing chip 30,
After upward signal carries out intensity modulated by dual output electroabsorption modulator 10, the first delivery outlet through dual output electroabsorption modulator 10 exports, and meanwhile, the second delivery outlet of dual output electroabsorption modulator 10 exports this locality concussion light source LO being used for relevant Heterodyne detect;
Downstream signal transfers to coherent receiver 20, and coherent receiver 20 utilizes local concussion light source LO to carry out relevant Heterodyne detect to downstream signal;
Digital signal processing chip 30 carries out digital Recovery processing by coherent digital envelope detected algorithm to the I road signal of relevant Heterodyne detect gained and Q road signal.
As shown in Figure 2, for the fundamental diagram of the relevant ONU based on dual output EAM, the wavelength of upward signal is equal with the wavelength that light source LO is shaken in this locality, frequency-splitting between local concussion light source LO and downstream signal is greater than signal bandwidth, Ruili backscattering (RayleighBackscattering) interference therefore can effectively avoiding upward signal and downstream signal to produce in transmitting procedure.
As shown in Figure 3, for the schematic diagram of dual output electroabsorption modulator 10, dual output electroabsorption modulator 10 comprises: DBR active area 101, Part I transmission DBR speculum 102, electro-absorption modulation district 103, electrode 104, first lens 105, Part II transmission DBR speculum 106 and the second lens 107.DBR active area 101 excites and produces continuous light wave, and wherein a part of light wave focuses on the continuous light wave of formation second delivery outlet through Part II transmission DBR speculum 106, second lens 107, exports as this locality concussion light source LO; Another part light wave exports electro-absorption modulation district 103 to through Part I transmission DBR speculum 102, and modulated current is loaded on light carrier through electrode 104, focuses on the modulated light wave of formation first delivery outlet, export as upward signal finally by the first lens 105.
As shown in Figure 4, for digital signal processing chip 30 carries out the digital flow chart recovered by coherent digital envelope detected algorithm to downstream signal, digital signal processing chip 30 is by I road signal and Q road signal combination, form (I+j × Q) complex signal, (I+j × Q) complex signal can be expressed as: I+j × Q=A (n) × exp (2 π j Δ fn+ θ (n)); Wherein, A (n) represents strength signal, and A (n) is by obtaining (I+j × Q) complex signal delivery, and A (n) just can recover transmission information after decision-making judgement; Δ f represents the frequency-splitting of relevant Heterodyne detect, and θ (n) represents Light source line width, and j represents the square root of-1, and n represents sampled point index.By coherent digital envelope detected algorithm, the frequency-splitting that (I+j × Q) complex signal comprises and line width information are all removed in delivery process, and therefore the method has very strong robustness to frequency disturbance and high live width.
The embodiment of the present invention additionally provides a kind of method that relevant ONU based on dual output EAM realizes single fiber bi-directional transmission, as shown in Figure 5, comprises the following steps:
After step 101, upward signal carry out intensity modulated by dual output electroabsorption modulator, the first delivery outlet through dual output electroabsorption modulator exports.
Second delivery outlet of step 102, dual output electroabsorption modulator exports this locality concussion light source LO being used for relevant Heterodyne detect.
Step 103, downstream signal through Optical Fiber Transmission to coherent receiver.
Step 104, coherent receiver utilize local concussion light source LO to carry out relevant Heterodyne detect to downstream signal, and export the I road signal obtained and Q road signal to digital signal processing chip.
Step 105, digital signal processing chip are processed I road signal and Q road signal by coherent digital envelope detected algorithm, recover downstream signal.
The present invention is not limited to above-mentioned preferred forms, and anyone should learn the structural change made under enlightenment of the present invention, and every have identical or close technical scheme with the present invention, all falls within protection scope of the present invention.
Claims (10)
1. based on the relevant ONU of dual output EAM, comprise coherent receiver and digital signal processing chip, it is characterized in that, also comprise dual output electroabsorption modulator,
After upward signal carries out intensity modulated by described dual output electroabsorption modulator, export through its first delivery outlet, meanwhile, its second delivery outlet exports this locality concussion light source LO being used for relevant Heterodyne detect;
Downstream signal transfers to described coherent receiver, and described coherent receiver utilizes described this locality concussion light source LO to carry out relevant Heterodyne detect to described downstream signal;
Described digital signal processing chip carries out digital Recovery processing by coherent digital envelope detected algorithm to the I road signal of relevant Heterodyne detect gained and Q road signal.
2. as claimed in claim 1 based on the relevant ONU of dual output EAM, it is characterized in that, described dual output electroabsorption modulator comprises DBR active area, Part I transmission DBR speculum, electro-absorption modulation district, electrode, the first lens, Part II transmission DBR speculum and the second lens
Described DBR active area excites and produces continuous light wave, and wherein a part of light wave is through described Part II transmission DBR speculum and described second lens focus, exports as described this locality concussion light source LO;
Another part light wave exports described electro-absorption modulation district to through described Part I transmission DBR speculum, and modulated current is loaded on light carrier through described electrode, finally by described first lens focus, exports as described upward signal.
3. as claimed in claim 1 based on the relevant ONU of dual output EAM, it is characterized in that, described digital signal processing chip is by described I road signal and described Q road signal combination, form (I+j × Q) complex signal, described (I+j × Q) complex signal can be expressed as: I+j × Q=A (n) × exp (2 π j Δ fn+ θ (n)); Wherein, A (n) represents strength signal, and described A (n) is by obtaining described (I+j × Q) complex signal delivery, and described A (n) just can recover transmission information after decision-making judgement; Δ f represents the frequency-splitting of relevant Heterodyne detect, and θ (n) represents Light source line width, and j represents the square root of-1, and n represents sampled point index.
4., as claimed in claim 1 based on the relevant ONU of dual output EAM, it is characterized in that, the wavelength of described upward signal is equal with the wavelength that light source LO is shaken in described this locality.
5. as claimed in claim 1 based on the relevant ONU of dual output EAM, it is characterized in that, the frequency-splitting between described this locality concussion light source LO and described downstream signal is greater than signal bandwidth.
6. realize a method for single fiber bi-directional transmission based on the relevant ONU of dual output EAM, it is characterized in that, comprise the following steps:
After upward signal carries out intensity modulated by dual output electroabsorption modulator, the first delivery outlet through described dual output electroabsorption modulator exports;
Second delivery outlet of described dual output electroabsorption modulator exports this locality concussion light source LO being used for relevant Heterodyne detect;
Downstream signal through Optical Fiber Transmission to coherent receiver;
Described coherent receiver utilizes described this locality concussion light source LO to carry out relevant Heterodyne detect to described downstream signal, and exports the I road signal obtained and Q road signal to digital signal processing chip;
Described digital signal processing chip is processed described I road signal and described Q road signal by coherent digital envelope detected algorithm, recovers described downstream signal.
7. method as claimed in claim 6, it is characterized in that, described dual output electroabsorption modulator comprises DBR active area, Part I transmission DBR speculum, electro-absorption modulation district, electrode, the first lens, Part II transmission DBR speculum and the second lens,
Described DBR active area excites and produces continuous light wave, and wherein a part of light wave is through described Part II transmission DBR speculum and described second lens focus, exports as described this locality concussion light source LO;
Another part light wave exports described electro-absorption modulation district to through described Part I transmission DBR speculum, and modulated current is loaded on light carrier through described electrode, finally by described first lens focus, exports as described upward signal.
8. method as claimed in claim 6, it is characterized in that, the concrete steps of described coherent digital envelope detected algorithm are:
Described digital signal processing chip is by described I road signal and described Q road signal combination, form (I+j × Q) complex signal, described (I+j × Q) complex signal can be expressed as: I+j × Q=A (n) × exp (2 π j Δ fn+ θ (n)); Wherein, A (n) represents strength signal, Δ f represents the frequency-splitting of relevant Heterodyne detect, θ (n) represents Light source line width, j represents the square root of-1, n represents sampled point index, obtains described A (n) to described (I+j × Q) complex signal delivery, and described A (n) just can recover transmission information after decision-making judgement.
9. method as claimed in claim 6, it is characterized in that, the wavelength of described upward signal is equal with the wavelength that light source LO is shaken in described this locality.
10. method as claimed in claim 6, is characterized in that, the frequency-splitting between described this locality concussion light source LO and described downstream signal is greater than signal bandwidth.
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| CN102761373A (en) * | 2011-04-28 | 2012-10-31 | 北京邮电大学 | High-speed high-capacity passive optical network system and method for realizing coherent reception |
| US20130107341A1 (en) * | 2011-10-27 | 2013-05-02 | Tao Zeng | Modulation Device and Modulation Method, and Demodulation Device and Demodulation Method |
| CN104010233A (en) * | 2014-05-15 | 2014-08-27 | 北京大学 | Polarization multiplexing coherent detection passive optical network based on ROSA |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102761373A (en) * | 2011-04-28 | 2012-10-31 | 北京邮电大学 | High-speed high-capacity passive optical network system and method for realizing coherent reception |
| US20130107341A1 (en) * | 2011-10-27 | 2013-05-02 | Tao Zeng | Modulation Device and Modulation Method, and Demodulation Device and Demodulation Method |
| CN104010233A (en) * | 2014-05-15 | 2014-08-27 | 北京大学 | Polarization multiplexing coherent detection passive optical network based on ROSA |
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