CN106788766A - A kind of OFDM PON systems based on on-off keying light modulation - Google Patents
A kind of OFDM PON systems based on on-off keying light modulation Download PDFInfo
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- CN106788766A CN106788766A CN201611097206.6A CN201611097206A CN106788766A CN 106788766 A CN106788766 A CN 106788766A CN 201611097206 A CN201611097206 A CN 201611097206A CN 106788766 A CN106788766 A CN 106788766A
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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
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- H04B10/516—Details of coding or modulation
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Abstract
The invention discloses a kind of OFDM PON systems based on on-off keying light modulation, including OLT, an ODN and multiple ONU, ODN includes power divider, OLT sends comprising the first signal, reception device, ONU sends comprising secondary signal, reception device, the optical signal that first, second sender unit will be modulated with OOK signals is separately sent to the second, first signal receiving device, and OOK signals are modulated by ofdm signal；First, second signal receiving device receives optical signal, and demodulation obtains ofdm signal；The optical signal that OLT sends is assigned to multiple ONU by power divider, and OLT is arrived in output all the way for the optical signal synthesis that multiple ONU are sent.Optical signal modulation OOK signals, are not limited by peak-to-average power ratio in the present invention, are driven without digital-to-analogue or analog-digital converter, linear radio-frequency, modulator and detector, and optical signal transmission is realized by existing optical device, simple to operate and cost is relatively low.
Description
Technical field
The present invention relates to Optical Access Network, and in particular to a kind of to be adjusted based on on-off keying (On-Off Keying, OOK) light
The OFDM-PON systems of system.
Background technology
Because various emerging service class business (such as cloud service, HDTV, Video chat and game on line etc.) are to band
Width requirement is higher, and terminal user increases to the demand of transmission bandwidth in geometry multiple.In order to meet the bandwidth need of Optical Access Network
Ask, traditional EPON (Passive Optical Network, PON) and the combination of various multiplexing technologies are wide
General research, including tdma, wavelength-division multiplex technique and orthogonal frequency division multiplexi (Orthogonal Frequency
Division Multiplexed, OFDM), and various technologies mixing application.OFDM-PON as a kind of great future simultaneously
And be sufficient for the candidate scheme of the user's request of Next Generation Access and be widely studied, OFDM-PON uses a series of sub- loads
The parallel transmission of ripple is compared with low bit speed rate, and each subcarrier can carry different modulation formats, with different transmission
Speed, by distributing different carrier waves to different users it is achieved thereby that the dynamic velocity allocation of each user.OFDM-PON
Advantage include：(1) with the development of high-speed digital video camera technology, its cost can be more and more cheaper；(2) ofdm signal pair
Anti- inter-carrier interference and intersymbol interference excellent performance；(3) stability of system and flexibility are high；(4) dynamic velocity allocation.
But, the feasibility that OFDM-PON is real-time end to end and offline transmission technology is realized but is subject to peak-to-average power ratio
(Peak To Average Power Ratio, PAPR), high-resolution digital analog converter and analog-digital converter, linear penetrate
Frequency driving and the limitation of linear modulator and detector.
The content of the invention
The technical problems to be solved by the invention are to solve that OFDM-PON is real-time end to end and offline transmission technology is realized
Feasibility be subject to peak-to-average power ratio, high-resolution digital analog converter and analog-digital converter, linear radio-frequency driven and line
Property modulator and detector limitation problem.
In order to solve the above-mentioned technical problem, the technical solution adopted in the present invention is to provide a kind of based on on-off keying light tune
The OFDM-PON systems of system, including OLT, an ODN and multiple ONU, the ODN include power divider, and the OLT includes the
One sender unit and the first signal receiving device, the ONU receive dress comprising secondary signal dispensing device and secondary signal
Put,
The optical signal that first, second sender unit will be modulated with OOK signals is separately sent to described second,
One signal receiving device, the OOK signals are formed by the ofdm signal modulation of carrying transmission information；
First, second signal receiving device receives the electric signal that the optical signal obtains being modulated with OOK signals, described
Electric signal demodulation obtains the ofdm signal, obtains transmission information；
The optical signal that the OLT sends is assigned to multiple ONU by the power divider, and multiple ONU are sent
Optical signal synthesis all the way output to the OLT.
In the above-mentioned technical solutions, first, second sender unit includes that ofdm signal generation device, Δ Σ are adjusted
Device processed and directly modulation laser, the ofdm signal generation device generate the ofdm signal, and the ofdm signal is by institute
Stating Deltasigma modulator modulation turns into OOK signals, and the OOK signals are by directly modulation laser generation optical signal feeding light
It is fine.
In the above-mentioned technical solutions, the ofdm signal is by after N times of over-sampling, through Δ Σ filter filterings, Ran Houjin
The bit quantization of row 1 and before feeding back to the Δ Σ wave filters, finally exports the OOK signals, wherein, N is just whole more than 1
Number.
In the above-mentioned technical solutions,
Frequency spectrum of the low frequency part of the OOK signals comprising the ofdm signal；
The HFS of the OOK signals includes quantizing noise.
In the above-mentioned technical solutions, first, second signal receiving device include photodetector, low pass filter and
Ofdm signal demodulating equipment, the optical signal that the photoelectricity sounder will be received is converted to the electric signal, the telecommunications
Number through the low pass filter filtering obtain ofdm modulation signal, the ofdm modulation signal is through the ofdm signal demodulating equipment
Demodulation obtains the ofdm signal.
In the above-mentioned technical solutions, described in the generation of the bandwidth of the low pass filter and the ofdm signal generation device
The bandwidth of ofdm signal is consistent.
In the present invention, optical signal modulation is OOK signals, and OOK signals are through the ofdm signal modulation of carrying transmission information
Into not limited by peak-to-average power ratio, it is not required that high-resolution digital analog converter and analog-digital converter, linear radio frequency drive
Dynamic and linear modulator and detector etc., it is possible to which optical signal is realized by existing 10Gbps and 40Gbps optical devices
Transmission, it is simple to operate and cost is relatively low.
Brief description of the drawings
A kind of OFDM-PON system block diagrams based on on-off keying light modulation that Fig. 1 is provided for the present invention；
A kind of first signal of OFDM-PON systems based on on-off keying light modulation that Fig. 2 is provided for the present invention sends dress
Put secondary signal dispensing device schematic diagram；
Fig. 3 is the schematic diagram that ofdm signal is modulated to Deltasigma modulator OOK signals in the present invention；
Fig. 4 be in the present invention ofdm signal by the OOK signals of Deltasigma modulator modulation output spectrum diagram；
Fig. 5 be a kind of OFDM-PON systems based on on-off keying light modulation in the present invention the first signal receiving device or
Secondary signal reception device schematic diagram.
Specific embodiment
The present invention is described in detail with reference to specification drawings and specific embodiments.
A kind of OFDM-PON systems based on on-off keying light modulation are the embodiment of the invention provides, as shown in figure 1, including
One OLT (Optical Line Terminal, optical line terminal) 1, ODN (Optical Distributed Network, light
Distribution network) in 2 and multiple ONU (Optical Network Unit, optical network unit) 3, ODN2 comprising power divider
4, OLT1 include the first sender unit 5 and the first signal receiving device 6, and secondary signal dispensing device 8 is included in ONU3
With secondary signal reception device 7.
The optical signal that first sender unit 5 and secondary signal dispensing device 8 will be modulated with OOK signals is separately sent to
The signal receiving device 6 of secondary signal reception device 7 and first, OOK signals are formed by the ofdm signal modulation of carrying transmission information；
First signal receiving device 6 and secondary signal reception device 7 receive the electric signal that optical signal obtains being modulated with OOK signals, telecommunications
Number final demodulation obtains ofdm signal, obtains transmission information.
The optical signal that OLT1 sends is assigned to multiple different ONU3 by the power divider 4 in ODN2, and by multiple not
OLT1 is arrived in output all the way for the optical signal synthesis that same ONU3 sends.
As shown in Fig. 2 the first sender unit 5 or secondary signal dispensing device 8 include ofdm signal generation device 50,
Deltasigma modulator 51 and directly modulation laser 52, the generation of ofdm signal generation device 50 carry the ofdm signal of transmission information,
Ofdm signal is modulated by Deltasigma modulator 51 turns into OOK signals, and OOK signals generate optical signal by directly modulation laser 52
Feeding optical fiber.
As shown in figure 3, the process that ofdm signal is modulated to OOK signals is by Deltasigma modulator 51：
Ofdm signal is by after N times of (N is the positive integer more than 1) over-sampling, through Δ Σ filter filterings, then carrying out 1
Bit quantization and before feeding back to Δ Σ wave filters, finally exports OOK signals.
As shown in figure 4, being spectrum diagram of the ofdm signal by the OOK signals of the modulation output of Deltasigma modulator 51, it is somebody's turn to do
The frequency spectrum of ofdm signal of the low frequency part of OOK signals comprising the output of ofdm signal generation device 50, the radio-frequency head of the OOK signals
Subpackage contains quantizing noise.
As shown in figure 5, the first signal receiving device 6 or secondary signal reception device 7 include photodetector 60, low pass filtered
Ripple device 61 and ofdm signal demodulating equipment 62, the optical signal that photoelectricity sounder 60 will be received are converted to electric signal, the electric signal
The filtering of low-pass filtered device 61 obtains ofdm modulation signal, and ofdm modulation signal is received through the demodulation of ofdm signal demodulating equipment 62
To ofdm signal, so as to obtain transmission information.
Wherein, the bandwidth of low pass filter 61 is consistent with the bandwidth of the ofdm signal that ofdm signal generation device 50 is generated.
In the present invention, optical signal modulation is OOK signals, and OOK signals are through the ofdm signal modulation of carrying transmission information
Into not limited by peak-to-average power ratio, it is not required that high-resolution digital analog converter and analog-digital converter, linear radio frequency drive
Dynamic and linear modulator and detector etc., it is possible to which optical signal is realized by existing 10Gbps and 40Gbps optical devices
Transmission, it is simple to operate and cost is relatively low.
The present invention is not limited to above-mentioned preferred forms, anyone structure change made under enlightenment of the invention,
It is every with of the invention with same or like technical scheme, each fall within protection scope of the present invention.
Claims (6)
1. a kind of OFDM-PON systems based on on-off keying light modulation, including OLT, an ODN and multiple ONU, the ODN bags
Containing power divider, the OLT includes the first sender unit and the first signal receiving device, and the ONU includes the second letter
Number dispensing device and secondary signal reception device, it is characterised in that
The optical signal that first, second sender unit will be modulated with OOK signals is separately sent to the described second, first letter
Number reception device, the OOK signals are formed by the ofdm signal modulation of carrying transmission information；
First, second signal receiving device receives the electric signal that the optical signal obtains being modulated with OOK signals, the telecommunications
Number demodulation obtains the ofdm signal, obtains transmission information；
The optical signal that the OLT sends is assigned to multiple ONU by the power divider, and the institute that multiple ONU are sent
The OLT is arrived in output all the way to state optical signal synthesis.
2. the OFDM-PON systems of on-off keying light modulation are based on as claimed in claim 1, it is characterised in that described first,
Secondary signal dispensing device includes ofdm signal generation device, Deltasigma modulator and directly modulation laser, the ofdm signal
Generation device generates the ofdm signal, and the ofdm signal turns into OOK signals by Deltasigma modulator modulation, described
OOK signals are by directly modulation laser generation optical signal feeding optical fiber.
3. the OFDM-PON systems of on-off keying light modulation are based on as claimed in claim 2, it is characterised in that the OFDM letters
Number by after N times of over-sampling, through Δ Σ filter filterings, before then carrying out 1 bit quantization and feeding back to the Δ Σ wave filters,
The OOK signals are finally exported, wherein, N is the positive integer more than 1.
4. the OFDM-PON systems of on-off keying light modulation are based on as claimed in claim 1, it is characterised in that
Frequency spectrum of the low frequency part of the OOK signals comprising the ofdm signal；
The HFS of the OOK signals includes quantizing noise.
5. the OFDM-PON systems of on-off keying light modulation are based on as claimed in claim 1, it is characterised in that described first,
Secondary signal reception device includes photodetector, low pass filter and ofdm signal demodulating equipment, and the photoelectricity sounder will
The optical signal for receiving is converted to the electric signal, and the electric signal obtains OFDM and modulates through low pass filter filtering
Signal, the ofdm modulation signal obtains the ofdm signal through ofdm signal demodulating equipment demodulation.
6. the OFDM-PON systems of on-off keying light modulation are based on as claimed in claim 5, it is characterised in that the low pass filtered
The bandwidth of ripple device is consistent with the bandwidth of the ofdm signal that the ofdm signal generation device is generated.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107959517A (en) * | 2017-11-09 | 2018-04-24 | 武汉邮电科学研究院 | A kind of method and system of the wireless power cloud based on large-scale antenna array |
| CN109600221A (en) * | 2018-12-31 | 2019-04-09 | 华南师范大学 | A kind of QTTH system and transmission method based on multi-core optical fiber mode division multiplexing |
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| CN103354625A (en) * | 2013-02-27 | 2013-10-16 | 上海交通大学 | Stacked wavelength-division and time-division multiplexing passive optical network transmission system based on OFDM (orthogonal frequency division multiple) |
| US20140056585A1 (en) * | 2012-02-16 | 2014-02-27 | Nec Laboratories America, Inc. | Next Generation Optical Access Network with Centralized Digital OLT |
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2016
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Patent Citations (3)
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| CN102113256A (en) * | 2008-07-31 | 2011-06-29 | 诺基亚西门子通信公司 | Method for data processing in optical network, optical network component and communication system |
| US20140056585A1 (en) * | 2012-02-16 | 2014-02-27 | Nec Laboratories America, Inc. | Next Generation Optical Access Network with Centralized Digital OLT |
| CN103354625A (en) * | 2013-02-27 | 2013-10-16 | 上海交通大学 | Stacked wavelength-division and time-division multiplexing passive optical network transmission system based on OFDM (orthogonal frequency division multiple) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107959517A (en) * | 2017-11-09 | 2018-04-24 | 武汉邮电科学研究院 | A kind of method and system of the wireless power cloud based on large-scale antenna array |
| CN107959517B (en) * | 2017-11-09 | 2020-08-25 | 武汉邮电科学研究院 | Wireless power clouding method and system based on large-scale antenna array |
| CN109600221A (en) * | 2018-12-31 | 2019-04-09 | 华南师范大学 | A kind of QTTH system and transmission method based on multi-core optical fiber mode division multiplexing |
| CN109600221B (en) * | 2018-12-31 | 2021-06-29 | 广东尤科泊得科技发展有限公司 | QTTH system based on multi-core optical fiber mode division multiplexing and transmission method |
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