CN204810475U - To data transmission system before passive optical network of quadrature - Google Patents
To data transmission system before passive optical network of quadrature Download PDFInfo
- Publication number
- CN204810475U CN204810475U CN201520475689.3U CN201520475689U CN204810475U CN 204810475 U CN204810475 U CN 204810475U CN 201520475689 U CN201520475689 U CN 201520475689U CN 204810475 U CN204810475 U CN 204810475U
- Authority
- CN
- China
- Prior art keywords
- unit
- optical
- modulation
- signal
- digital
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 91
- 230000005540 biological transmission Effects 0.000 title claims abstract description 23
- 239000013307 optical fiber Substances 0.000 claims abstract description 17
- 238000006243 chemical reaction Methods 0.000 claims description 26
- 238000001514 detection method Methods 0.000 claims description 6
- 239000002131 composite material Substances 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 4
- 230000001427 coherent effect Effects 0.000 claims description 3
- 238000004891 communication Methods 0.000 abstract description 2
- 150000001875 compounds Chemical group 0.000 abstract description 2
- 239000000835 fiber Substances 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Landscapes
- Optical Communication System (AREA)
Abstract
The utility model discloses a to data transmission system before passive optical network of quadrature, including optical fiber link unit, passive optical node, preceding end -node, including a plurality of preceding to transmitting element, the compound unit of light multichannel in the optical fiber link unit, passive optical node is to receiving element before a plurality of, precedingly carry out the quadrature modulation to preceding to the data flow to the transmitting element, when carrying out the quadrature modulation, preceding subcarrier from the intermediate frequency of quadrature modulation frequency band to the transmitting element that avoid being located to suppress the mix of many wave frequencies to preceding influence to data transmission, under the circumstances of guaranteeing communication quality, improved the transmission distance of data in the passive optical network system.
Description
Technical Field
The utility model relates to an optical signal transmission field especially relates to a forward data transmission system of quadrature passive optical fiber network.
Background
The passive optical fiber network is characterized in that an optical distribution network does not contain any electronic device and electronic power supply, and is composed of passive devices such as optical branching devices and the like. But the transmission distance is shorter than that of an active optical fiber access system, and the coverage range is smaller; the front-end nodes of each passive optical network can only be arranged in a relatively concentrated place of the passive optical nodes, while the passive optical nodes far away from the front-end nodes need to be added with new front-end nodes, and even a new passive optical network needs to be established to realize data transmission because the transmission distance is far away, so that the operation and maintenance cost of a network operator is inevitably increased, and the resource waste of the passive optical network is also caused. And, the passive optical network also lacks flexibility of network arrangement, which is not beneficial to the access of new users and the conversion of new services.
On the other hand, with the development of the carrier orthogonal multiplexing technology, the high spectrum utilization efficiency and the large dispersion tolerance thereof make it a more effective modulation mode. The passive optical fiber network based on orthogonal multiplexing not only can inherit various advantages of the traditional passive optical fiber network, but also can dynamically adjust the bandwidth occupied by each passive optical node, thereby not only meeting the bandwidth requirement required by user service, but also not causing bandwidth waste, simultaneously improving the noise resistance and enhancing the data transmission performance.
However, when the orthogonal multiplexing technique is applied to a passive optical network system, the multi-wave frequency mixing effect becomes a main limiting factor of the system performance. In order to achieve optimal transmission in a passive optical network system based on an orthogonal multiplexing technology, the transmission distance from a front-end node to a passive optical node is longer, the transmission coverage is larger, and the multi-wave frequency mixing influence during forward transmission needs to be suppressed.
SUMMERY OF THE UTILITY MODEL
The purpose of the utility model is realized through the following technical scheme.
According to the utility model discloses an embodiment provides an orthogonal passive optical network forward data transmission system, the system includes fiber link unit, feeder optic fibre, passive optical node, front end node, the fiber link unit passes through the input of feeder optic fibre connection front end node, the input of passive optical node is connected to the output of front end node; wherein,
the optical fiber link unit comprises a plurality of forward sending units and an optical multi-path composite unit, and the passive optical node comprises a plurality of forward receiving units; the forward sending unit avoids the subcarrier at the middle frequency of the orthogonal modulation frequency band when the forward data stream is orthogonally modulated;
the forward sending unit comprises an orthogonal modulation unit, a digital-to-analog conversion unit, a first optical carrier generation unit and an optical signal modulation unit;
the quadrature modulation unit performs quadrature modulation on the forward data stream to generate a baseband quadrature modulation signal;
the digital-to-analog conversion unit performs digital-to-analog conversion on the baseband quadrature modulation signal output by the quadrature modulation unit and inputs the baseband quadrature modulation signal to the optical signal modulation unit;
the first optical carrier generating unit generates and sends an optical carrier to the optical signal modulating unit;
the optical signal modulation unit modulates an optical carrier by using a quadrature modulation signal to generate a forward optical signal;
the forward receiving unit comprises a second optical carrier generating unit, a frequency modulation detecting unit, an analog-to-digital converting unit and a digital signal analyzing unit;
the second optical carrier generating unit generates and outputs an optical carrier to the frequency modulation detecting unit for frequency conversion;
the frequency modulation detection unit receives the forward optical signal and carries out frequency conversion with the optical carrier output by the second optical carrier generation unit to complete coherent detection and photoelectric conversion;
the analog-to-digital conversion unit inputs the electric signal into the digital signal analysis unit after analog-to-digital conversion;
the digital signal analysis unit separates the orthogonal modulation frequency band loaded with effective data, and then carries out orthogonal modulation and demodulation processing in a frequency domain to recover each path of forward data stream.
The utility model discloses a positive data transmission system of quadrature passive optical network, including fiber link unit, passive optical node, front end node, including a plurality of forward transmission units, the compound unit of light multichannel in the fiber link unit, passive optical node is including a plurality of forward receiving elements; the forward transmitting unit carries out orthogonal modulation on the forward data stream, and avoids a subcarrier at the intermediate frequency of an orthogonal modulation frequency band during the orthogonal modulation, so that the influence of multi-wave frequency mixing on forward data transmission is inhibited, and the transmission distance of data in a passive optical network system is increased under the condition of ensuring the communication quality.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a schematic structural diagram of an orthogonal passive optical fiber network forward data transmission system according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
According to the utility model discloses an embodiment proposes an orthogonal passive optical network forward data transmission system, as shown in fig. 1, the system includes fiber link unit, feeder optic fibre, passive optical node, front-end node, fiber link unit passes through the input of feeder optic fibre connection front-end node, the input of passive optical node is connected to the output of front-end node; wherein,
the optical fiber link unit comprises a plurality of forward sending units and an optical multi-path composite unit, and the passive optical node comprises a plurality of forward receiving units;
the forward sending unit carries out quadrature modulation on forward data flow and raises the frequency of a generated baseband quadrature modulation signal to an optical signal wave band to form a forward optical signal; the forward optical signals output by the forward sending units have different wavelengths; when orthogonal modulation is performed, the forward transmission unit avoids a subcarrier located at the middle frequency of an orthogonal modulation frequency band;
the optical multi-path composite unit combines the forward optical signals output by the forward sending units into one path of optical signal;
the front-end node receives the forward optical signals from the optical fiber link unit, demultiplexes the forward optical signals and sends the forward optical signals to each passive optical node;
the forward receiving unit detects and receives the demultiplexed forward optical signals, converts the forward optical signals into electric signal wave bands, filters out orthogonal modulation frequency bands loaded with effective data, and performs orthogonal modulation and demodulation processing on a frequency domain to recover a forward data stream.
According to the utility model discloses an implementation mode, forward sending unit includes quadrature modulation unit, digital analog conversion unit, first light carrier wave generating unit, light signal modulation unit;
the quadrature modulation unit performs quadrature modulation on the forward data stream to generate a baseband quadrature modulation signal;
the digital-to-analog conversion unit performs digital-to-analog conversion on the baseband quadrature modulation signal output by the quadrature modulation unit and inputs the baseband quadrature modulation signal to the optical signal modulation unit;
the first optical carrier generating unit generates and sends an optical carrier to the optical signal modulating unit;
the optical signal modulation unit modulates an optical carrier with a quadrature modulation signal to generate a forward optical signal.
According to the utility model discloses an embodiment, forward receiving element includes second light carrier generation unit, frequency modulation detecting element, analog-to-digital conversion unit, digital signal analysis unit;
the second optical carrier generating unit generates and outputs an optical carrier to the frequency modulation detecting unit for frequency conversion;
the frequency modulation detection unit receives the forward optical signal and carries out frequency conversion with the optical carrier output by the second optical carrier generation unit to complete coherent detection and photoelectric conversion;
the analog-to-digital conversion unit inputs the electric signal into the digital signal analysis unit after analog-to-digital conversion;
the digital signal analysis unit separates the orthogonal modulation frequency band loaded with effective data, and then carries out orthogonal modulation and demodulation processing in a frequency domain to recover each path of forward data stream.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (1)
1. A forward data transmission system of an orthogonal passive optical network comprises an optical fiber link unit, a feeder optical fiber, a passive optical node and a front end node, wherein the optical fiber link unit is connected with the input end of the front end node through the feeder optical fiber, and the output end of the front end node is connected with the input end of the passive optical node; wherein,
the optical fiber link unit comprises a plurality of forward sending units and an optical multi-path composite unit, and the passive optical node comprises a plurality of forward receiving units; the forward sending unit avoids the subcarrier at the middle frequency of the orthogonal modulation frequency band when the forward data stream is orthogonally modulated;
the forward sending unit comprises an orthogonal modulation unit, a digital-to-analog conversion unit, a first optical carrier generation unit and an optical signal modulation unit;
the quadrature modulation unit performs quadrature modulation on the forward data stream to generate a baseband quadrature modulation signal;
the digital-to-analog conversion unit performs digital-to-analog conversion on the baseband quadrature modulation signal output by the quadrature modulation unit and inputs the baseband quadrature modulation signal to the optical signal modulation unit;
the first optical carrier generating unit generates and sends an optical carrier to the optical signal modulating unit;
the optical signal modulation unit modulates an optical carrier by using a quadrature modulation signal to generate a forward optical signal;
the forward receiving unit comprises a second optical carrier generating unit, a frequency modulation detecting unit, an analog-to-digital converting unit and a digital signal analyzing unit;
the second optical carrier generating unit generates and outputs an optical carrier to the frequency modulation detecting unit for frequency conversion;
the frequency modulation detection unit receives the forward optical signal and carries out frequency conversion with the optical carrier output by the second optical carrier generation unit to complete coherent detection and photoelectric conversion;
the analog-to-digital conversion unit inputs the electric signal into the digital signal analysis unit after analog-to-digital conversion;
the digital signal analysis unit separates the orthogonal modulation frequency band loaded with effective data, and then carries out orthogonal modulation and demodulation processing in a frequency domain to recover each path of forward data stream.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520475689.3U CN204810475U (en) | 2015-07-03 | 2015-07-03 | To data transmission system before passive optical network of quadrature |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520475689.3U CN204810475U (en) | 2015-07-03 | 2015-07-03 | To data transmission system before passive optical network of quadrature |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204810475U true CN204810475U (en) | 2015-11-25 |
Family
ID=54595219
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520475689.3U Expired - Fee Related CN204810475U (en) | 2015-07-03 | 2015-07-03 | To data transmission system before passive optical network of quadrature |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204810475U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109417656A (en) * | 2016-06-01 | 2019-03-01 | 罗什米尔股份有限公司 | Light switched data network |
-
2015
- 2015-07-03 CN CN201520475689.3U patent/CN204810475U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109417656A (en) * | 2016-06-01 | 2019-03-01 | 罗什米尔股份有限公司 | Light switched data network |
| CN109417656B (en) * | 2016-06-01 | 2021-12-10 | 罗什米尔股份有限公司 | Optical switched data network |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP6483287B2 (en) | System for improving frequency utilization efficiency in a multi-carrier communication system | |
| US9461749B2 (en) | Optical line terminal transmitting device for next generation optical access networks | |
| CN106304420B (en) | Wireless forward transmission system for 5G power multiplexing-oriented analog optical transmission | |
| KR20120068337A (en) | Method and apparatus for transmitting and receiving coherent optical ofdm | |
| CN104410462A (en) | Polarization-multiplexing-based method and device for modulating and directly detecting optical signals | |
| CN104301811A (en) | Coherent passive optical network system and signal transmitting and receiving method | |
| CN111541492A (en) | Multichannel expanded ultra-wideband radio-frequency channelized receiving device and implementation method | |
| US8666250B2 (en) | Optical access network and nodes | |
| CN104967487A (en) | In-band unvarnished transmission monitoring signal optical module based on frequency modulation | |
| Honda et al. | Experimental analysis of LTE signals in WDM-PON managed by embedded pilot tone | |
| CN102238130A (en) | OFDM (orthogonal frequency division multiplexing)-based WDM (wavelength division multiplexing)-PON (positive optical network) system and downlink data transmission method | |
| CN204810475U (en) | To data transmission system before passive optical network of quadrature | |
| US10505661B2 (en) | Methods and apparatus for multiplexing signals | |
| CN103004111B (en) | A kind of coherent reception signal method, equipment and system | |
| EP3016303B1 (en) | Method, device, and system for sending and receiving signal | |
| WO2016173616A1 (en) | Method and apparatus for multiplexing and demultiplexing signals | |
| US20130343760A1 (en) | System and method for optical transmission | |
| Zhong et al. | Experimental demonstrations of matching filter-free digital filter multiplexed SSB OFDM IMDD transmission systems | |
| Zhou et al. | A novel multi-band OFDMA-PON architecture using signal-to-signal beat interference cancellation receivers based on balanced detection | |
| JP2013016979A (en) | Reception apparatus and method by optical orthogonal frequency division multiplex transmission system | |
| Du et al. | A resource sharing C-RAN architecture with wavelength selective switching and parallel uplink signal detection | |
| JP5579656B2 (en) | Optical communication system and optical transmitter | |
| JP2008206063A (en) | Optical transmission device and method | |
| Ridwan et al. | Fiber wireless testbed using universal software radio peripheral (usrp) | |
| CN103347222A (en) | Method and system for realizing ONU colorlessness in OFDM-PON |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151125 Termination date: 20160703 |