CN205754342U - A kind of WDM-PON communication system regulated and controled based on ultra-narrow band spectrum segmentation incoherent light source and adaptive threshold - Google Patents
A kind of WDM-PON communication system regulated and controled based on ultra-narrow band spectrum segmentation incoherent light source and adaptive threshold Download PDFInfo
- Publication number
- CN205754342U CN205754342U CN201620421627.9U CN201620421627U CN205754342U CN 205754342 U CN205754342 U CN 205754342U CN 201620421627 U CN201620421627 U CN 201620421627U CN 205754342 U CN205754342 U CN 205754342U
- Authority
- CN
- China
- Prior art keywords
- light source
- narrow band
- adaptive threshold
- ultra
- wdm
- 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.)
- Active
Links
Abstract
The utility model discloses a kind of WDM PON communication system regulated and controled based on ultra-narrow band spectrum segmentation incoherent light source and adaptive threshold, including central station, remote fibre-optic transmission system (FOTS), distant-end node and optical network unit, described distant-end node is connected with central station by remote fibre-optic transmission system (FOTS), described optical network unit is connected with distant-end node, and described central station includes the wide spectrum light source being sequentially connected with, super narrow band filter, the first multichannel separation coupling device, multiple data modulation module and the second wavelength division multiplexer；Described distant-end node includes three wavelength division multiplexers/demultiplexer；Described optical network unit includes adaptive threshold adjustment module and data demodulation module, this utility model can be effectively improved the impact of intensity noise, the ultra-narrow band live width of light source is checked colors and is dissipated and the impact of optically filtering has stronger resistance simultaneously, it is adaptable to dense wave division multipurpose light passive network (DWDM PON) communication system.
Description
Technical field
This utility model belongs to communication technical field, a kind of WDM-PON communication system regulated and controled based on ultra-narrow band spectrum segmentation incoherent light source and adaptive threshold.
Background technology
Along with the high speed development of information technology, tele-medicine, IPTV, the bandwidth demand of network is increased by the Advanced Communications System such as video traffic, big data cloud analysis such as HDTV day by day.The development of FTTx has driven the development of EPON (PON) greatly.Wherein, DWDM-PON system is considered as the most promising and most promising access system.At present, the most wavelength locking WDM-PON and Wavelength reuse WDM-PON technology are developed into commercial level.
Wavelength locking WDM-PON mainly make use of injecting lock mould principle.When external seed light source inject fabry-Perot laser diode (Fabry-Perot Laser Diode,
FP-LD), after in, the only wavelength as seed light source wavelength is locked and is exaggerated, and suppresses the intensity of other wavelength light simultaneously.Seed light source can use wideband light source (Broadband Source, BBS), such as amplified spontaneous emission source (Amplified Spontaneous
Emission, ASE), or multi-wavelength/Multi-Longitudinal Mode laser, or the mode directly using double FP-LD to inject mutually carrys out wavelength locking.
Broadband seed light source can central office (Central Office, CO) optical line terminal (Optical Line Terminal,
OLT) in or optical network unit (Optical Network Unit,
ONU), in, it is also possible to be totally absorbed in CO, the seed light source needed for descending or uplink communication is provided for whole communication system.Broadband seed light source is when through wavelength-division multiplex multiplexing/demultiplexer (WDM MUX/DMUX), and spectrum can be split, and the seed light after spectrum segmentation is injected in FP-LD.But, the spectral width after WDM MUX/DMUX spectrum segmentation is wider (more than 60GHz), is easily affected by dispersion and optically filtering, and transmission range is limited, and is not suitable for dense wavelength division multiplexing system.
Utility model content
For solving above-mentioned technical problem, this utility model provides a kind of WDM-PON communication system regulated and controled based on ultra-narrow band spectrum segmentation incoherent light source and adaptive threshold, it is effective against the impact of intensity noise, the ultra-narrow band live width of light source is checked colors and is dissipated and the impact of optically filtering has stronger resistance simultaneously, it is adaptable to remote DWDM communication system.
nullThis utility model is by the following technical solutions: a kind of WDM-PON communication system regulated and controled based on ultra-narrow band spectrum segmentation incoherent light source and adaptive threshold，Including central station、Remote fibre-optic transmission system (FOTS)、Distant-end node and optical network unit，Described distant-end node is connected with central station by remote fibre-optic transmission system (FOTS)，Described optical network unit is connected with distant-end node，Described central station includes the wide spectrum light source for inciding downstream signal being sequentially connected with、Super narrow band filter for cutting wide spectrum light source、The first multichannel separation coupling device (first order array waveguide grating AWG1 can be selected) of respective channel it is separated to for different wave length being surpassed narrow-band light source、And multiple data modulation module and the second wavelength division multiplexer (second level array waveguide grating AWG2 can be selected) that multichannel downstream signal is coupled，The two ends of the plurality of data modulation module are connected with the first multichannel separation coupling device and the second wavelength division multiplexer respectively；Data modulation module can strengthen the system transfers performance of 3-dB by the electric absorption photomodulator that polarization state is insensitive.
Described distant-end node includes the three wavelength division multiplexers/demultiplexer separated for wavelength-division multiplex/multichannel；It is connected to central station by remote fibre-optic transmission system (FOTS)；Described three wavelength division multiplexers/demultiplexer preferably employs array waveguide grating or film filter.
Described optical network unit includes that adaptive threshold adjustment module and the data demodulation module being connected to three wavelength division multiplexers/demultiplexer, described adaptive threshold adjustment module include that photodetector, adaptive threshold calculate and comparator.Modulate signals on each channel wavelength of ultra-narrow band spectrum segmentation incoherent light source (ultra-narrow spectrum-sliced incoherent light, USSIL) at CO；The intensity noise of USSIL is utilized to be concentrated mainly on low frequency region characteristic at optical network unit (ONU), the decision threshold of receiving terminal is dynamically regulated by adaptive algorithm, it is effective against dispersion and optically filtering impact, improve the communication performance of optical system, reduce signal error rate (Bit Error Rate, BER).
Described wide spectrum light source is the ASE that LED, fabry perot laser diode FP-LD, super luminescence diode SLD or erbium-doped optical fiber amplifier EDFA produce or the Supercontinuum source SLS etc. produced by nonlinear effect.
Described super narrow band filter uses Gaussian filter or has fiber grating filter or the fabry-perot filter of Lorentz lorentz's shape.
The temperature of described super narrow band filter is controlled by TEC.
The channel spacing of described super narrow band filter keeps consistent with the channel spacing of WDM-PON system.
The plurality of data modulation module uses the on-off keying modulation system having preferable resistance to intensity noise.
It is provided with preposition Error Correction of Coding before described data modulation module, uses preposition error correction decoding to strengthen the noise resistance of system after the self feed back threshold value decision circuit of optical network unit.
Described adaptive threshold adjustment module adjusts the decision threshold of signal by adaptive threshold value regulation and control algorithm, and described adaptive threshold value regulation and control algorithm uses single element decision-feedback, blind Detecting or generalized likelihood-ratio test-Maximum likelihood sequence detection etc..
In this utility model, preposition Error Correction of Coding can be used at transmitting terminal, and use preposition error correction decoding to strengthen the noise resistance of system after the self feed back threshold value decision circuit of receiving terminal.
The utility model has the advantages that: this utility model uses ultra-narrow band spectrum segmentation incoherent light source and adaptive threshold control technique, the irrelevant light source of ultra-narrow band spectrum segmentation is to utilize super narrow band filter to be filtered obtaining to wide spectrum light source, and live width is less than 700MHz.Utilize the intensity noise dependency of adjacent signal, utilize adaptive algorithm, the change of estimation intensity noise at signal receiving end, and be adaptively adjusted the threshold value of signal, improve signal error rate (Bit Error Rate, BER).Being effective against the impact of intensity noise, the ultra-narrow band live width of light source is checked colors and is dissipated and the impact of optically filtering has stronger resistance simultaneously, it is adaptable to remote DWDM-PON communication system.
Accompanying drawing explanation
Fig. 1 be in WDM-PON based on ultra-narrow band spectrum segmentation incoherent light source and the downlink communication system and device figure of adaptive threshold regulator control system；
Fig. 2 a is the spectrogram of the wide spectrum light source used in WDM-PON system；
Fig. 2 b is wide spectrum light source flashlight spectrogram after ovennodulation and path multiplexing after ultra-narrow band cutting in WDM-PON system；
Fig. 3 is the comparison of the relative intensity noise spectrogram of the spectrum segmentation incoherent light source of the spectrum segmentation incoherent light source of live width 63-GHz and ultra-narrow band 700-MHz live width；
Fig. 4 is based in WDM-PON system, is positioned at the bit error rate and the relation of transmission range of the 25Gb/s signal of 1542nm passage.
Detailed description of the invention
In order to deepen understanding of the present utility model, being described in further detail of the present utility model below in conjunction with embodiment and accompanying drawing, this embodiment is only used for explaining this utility model, is not intended that the restriction to protection domain of the present utility model.
As it is shown in figure 1, a kind of WDM-PON communication system regulated and controled based on ultra-narrow band spectrum segmentation incoherent light source and adaptive threshold, mainly include central station, remote fibre-optic transmission system (FOTS), distant-end node and optical network unit.
Central station further comprises wide range incoherent light source BLS for inciding downstream signal, have chosen erbium-doped optical fiber amplifier EDFA and be produced from the big divergent light source of granting in the present embodiment；For the super narrow bandpass optical filters of cutting wide range incoherent light source, the present embodiment have chosen Fabry-Perot (FFP) wave filter；Different wave length is surpassed narrow-band light source and is separated to the first multichannel separation coupling device of respective channel, the present embodiment have chosen array waveguide grating (arrayed wavelength grating
AWG)；And multiple data modulation module, signal has first passed through preposition Error Correction of Coding before carrying out light modulation；With the second wavelength division multiplexer coupled by multichannel downstream signal, the present embodiment have chosen array waveguide grating (arrayed wavelength grating
AWG)；The channel spacing wherein surpassing narrow bandpass optical filters should be consistent with the channel spacing of WDM-PON system, the irrelevant light source of ultra-narrow band spectrum segmentation is to utilize Fiber Optic Sensor FP (Fiber Fabry-Perot, FFP) wave filter to amplified spontaneous emission source (Amplified Spontaneous
Emission, ASE) it is filtered obtaining, live width is less than 700MHz, and data modulation module can use the electroabsorption modulator of polarization insensitive to carry out enhancing signal signal to noise ratio.Erbium-doped optical fiber amplifier EDFA is utilized to produce wide spectrum light source (broad light spectrum, BLS) i.e. ase signal, the spectrum of BLS obtains incoherent super-narrow line width multi wave length illuminating source by ultra-narrow bandwidth FFP optical filter cutting afterwards, incoherent super-narrow line width multi wave length illuminating source realizes the separation of wavelength by array waveguide grating AWG1, and utilize multiple data modulation module to modulate the signal on different wave length, each wavelength signals loading signal is coupled together by recycling AWG2, i.e. wave division multiplexing WDM MUX, by a fiber-optic transfer to distant-end node RN.The USSIL that FFP wave filter produces has the biggest intensity noise in low frequency range, maximum near DC area noise, and and the live width of light source be inversely proportional to (live width of relative noise intensity=1/USSIL).When the live width of USSIL is less than 500MHz, intensity noise mainly affects low frequency signal.So, for high speed signal (such as speed is higher than 20Gb/s), the intensity noise of adjacent bit signal has strong correlation.
Distant-end node: be responsible for receiving the optical signal through long distance transmission, including the three wavelength division multiplexers/demultiplexer separated for wavelength-division multiplex/multichannel, the present embodiment is selected array waveguide grating AWG3, each wavelength signals is separated, i.e. Wave Decomposition multiplexing, is connected to central station by remote fibre-optic transmission system (FOTS).
Optical network unit ONU includes adaptive threshold adjustment module and the data demodulation module being connected to three wavelength division multiplexers/demultiplexer, wherein, adaptive threshold adjustment module includes photodetector (selection photodiode), threshold calculation module based on the signal of telecommunication and comparator.The optical signalling of each wavelength channel is converted into the signal of telecommunication by photodiode, and the threshold value of the system of reception is regulated and controled by the feedback line that the signal of telecommunication regulates and controls through adaptive threshold, reduces the bit error rate of system, promotes communication system performance.
As shown in Figure 2 a, incoherent light source BLS of the wide range of employing is smooth in having the widest wave-length coverage, high-power feature.As shown in Figure 2 b, carrying out ultra-narrow band cutting and modulate through signal, the spectrogram of the optical signal after path multiplexing, it has ultra-narrow bandwidth, channel spacing and the feature of system channel interval coupling.
As it is shown on figure 3, compare the spectrum segmentation incoherent light source of live width 63-GHz and the relative intensity noise spectrogram of the spectrum segmentation incoherent light source of ultra-narrow band 700-MHz live width.Traditional 63-GHz spectrum segmentation incoherent light source shows the characteristic of similar Gaussian noise in signal bandwidth.The spectrum segmentation incoherent light source of ultra-narrow band 700-MHz live width is then concentrated mainly on low frequency region.When frequency > 2GHz time, the relative intensity noise of the spectrum segmentation incoherent light source of ultra-narrow band 700-MHz live width is less than the analog value of spectrum segmentation incoherent light source of 63-GHz live width.
As shown in Figure 4, based in WDM-PON system, when being positioned at the channel transfer 25Gb/s signal of 1542nm, the threshold value using adaptive feedback control can be substantially reduced the bit error rate of transmission system, comparing the bit error rate that relatively fixing optimal threshold obtains, the threshold value of adaptive feedback control can reduce the bit error rate more than 10dB.
Claims (10)
1. the WDM-PON communication system regulated and controled based on ultra-narrow band spectrum segmentation incoherent light source and adaptive threshold, it is characterized in that, including central station, remote fibre-optic transmission system (FOTS), distant-end node and optical network unit, described distant-end node is connected with central station by remote fibre-optic transmission system (FOTS), described optical network unit is connected with distant-end node, described central station includes the wide spectrum light source being sequentially connected with, super narrow band filter, first multichannel separation coupling device, multiple data modulation module and the second wavelength division multiplexer, the two ends of the plurality of data modulation module are connected with the first multichannel separation coupling device and the second wavelength division multiplexer respectively；Described distant-end node includes three wavelength division multiplexers/demultiplexer；Described optical network unit includes that adaptive threshold adjustment module and data demodulation module, described adaptive threshold adjustment module include that photodetector, adaptive threshold calculate and comparator.
A kind of WDM-PON communication system regulated and controled based on ultra-narrow band spectrum segmentation incoherent light source and adaptive threshold the most according to claim 1, it is characterized in that, described wide spectrum light source is the ASE that LED, fabry perot laser diode FP-LD, super luminescence diode SLD or erbium-doped optical fiber amplifier EDFA produce or the Supercontinuum source SLS produced by nonlinear effect.
A kind of WDM-PON communication system regulated and controled based on ultra-narrow band spectrum segmentation incoherent light source and adaptive threshold the most according to claim 1, it is characterized in that, described super narrow band filter uses Gaussian filter or has fiber grating filter or the fabry-perot filter of Lorentz lorentz's shape.
4. according to a kind of WDM-PON communication system regulated and controled based on ultra-narrow band spectrum segmentation incoherent light source and adaptive threshold described in claim 1 or 3, it is characterised in that the temperature of described super narrow band filter is controlled by TEC.
5. according to a kind of WDM-PON communication system regulated and controled based on ultra-narrow band spectrum segmentation incoherent light source and adaptive threshold described in claim 1 or 3, it is characterized in that, the channel spacing of described super narrow band filter keeps consistent with the channel spacing of WDM-PON system.
A kind of WDM-PON communication system regulated and controled based on ultra-narrow band spectrum segmentation incoherent light source and adaptive threshold the most according to claim 1, it is characterised in that the plurality of data modulation module uses the on-off keying modulation system having resistance to intensity noise.
A kind of WDM-PON communication system regulated and controled based on ultra-narrow band spectrum segmentation incoherent light source and adaptive threshold the most according to claim 1, it is characterised in that described data modulation module uses the electric absorption photomodulator that polarization state is insensitive.
A kind of WDM-PON communication system regulated and controled based on ultra-narrow band spectrum segmentation incoherent light source and adaptive threshold the most according to claim 1, it is characterized in that, it is provided with preposition Error Correction of Coding before described data modulation module, uses preposition error correction decoding to strengthen the noise resistance of system after the self feed back threshold value decision circuit of optical network unit.
A kind of WDM-PON communication system regulated and controled based on ultra-narrow band spectrum segmentation incoherent light source and adaptive threshold the most according to claim 1, it is characterised in that described three wavelength division multiplexers/demultiplexer uses array waveguide grating or film filter.
A kind of WDM-PON communication system regulated and controled based on ultra-narrow band spectrum segmentation incoherent light source and adaptive threshold the most according to claim 1, it is characterized in that, described adaptive threshold adjustment module adjusts the decision threshold of signal by adaptive threshold value regulation and control algorithm, and described adaptive threshold value regulation and control algorithm uses single element decision-feedback, blind Detecting or generalized likelihood-ratio test-Maximum likelihood sequence detection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620421627.9U CN205754342U (en) | 2016-05-11 | 2016-05-11 | A kind of WDM-PON communication system regulated and controled based on ultra-narrow band spectrum segmentation incoherent light source and adaptive threshold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620421627.9U CN205754342U (en) | 2016-05-11 | 2016-05-11 | A kind of WDM-PON communication system regulated and controled based on ultra-narrow band spectrum segmentation incoherent light source and adaptive threshold |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205754342U true CN205754342U (en) | 2016-11-30 |
Family
ID=57368188
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620421627.9U Active CN205754342U (en) | 2016-05-11 | 2016-05-11 | A kind of WDM-PON communication system regulated and controled based on ultra-narrow band spectrum segmentation incoherent light source and adaptive threshold |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205754342U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017193600A1 (en) * | 2016-05-11 | 2017-11-16 | 中天宽带技术有限公司 | Communication apparatus based on ultra-narrow band spectrum segmentation incoherent light source and self-adaptive threshold regulation and control in wdm-pon system |
| CN110596818A (en) * | 2019-10-17 | 2019-12-20 | 中天宽带技术有限公司 | Film filter sheet type wavelength division multiplexer surface mounting tool and process |
-
2016
- 2016-05-11 CN CN201620421627.9U patent/CN205754342U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017193600A1 (en) * | 2016-05-11 | 2017-11-16 | 中天宽带技术有限公司 | Communication apparatus based on ultra-narrow band spectrum segmentation incoherent light source and self-adaptive threshold regulation and control in wdm-pon system |
| CN110596818A (en) * | 2019-10-17 | 2019-12-20 | 中天宽带技术有限公司 | Film filter sheet type wavelength division multiplexer surface mounting tool and process |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Lin | Next generation PON in emerging networks | |
| Lee et al. | Dense WDM-PON based on wavelength-locked Fabry-Pe/spl acute/rot laser diodes | |
| KR100325687B1 (en) | A low-cost WDM source with an incoherent light injected Fabry-Perot semiconductor laser diode | |
| CN101019350B (en) | Receiver having an apparatus for varying decision threshold level and an optical transmission system having the same | |
| CN104508921B (en) | External cavity type fabry-Perot type laser | |
| CN102833030B (en) | TWDM-PON (Time Wavelength Division Multiplexing-Passive Optical Network) ONU (Optical Network Unit) implementation device and method based on cyclical optical tunable filter | |
| Sundar et al. | Performance investigation of 16/32-channel DWDM PON and long-reach PON systems using an ASE noise source | |
| Xiong et al. | Characterization of directly modulated self-seeded reflective semiconductor optical amplifiers utilized as colorless transmitters in WDM-PONs | |
| Payoux et al. | Gigabit optical access using WDM PON based on spectrum slicing and reflective SOA | |
| CN105827320B (en) | A kind of transmitting device of the ultra-narrow based on FFP filters and FFP-SOA with spectrum segmentation incoherent light source in WDM-PON | |
| Srivastava | Next generation PON evolution | |
| Zhang et al. | Colorless-light and tunable-light-source schemes for TWDM and WDM PONs | |
| CN205754342U (en) | A kind of WDM-PON communication system regulated and controled based on ultra-narrow band spectrum segmentation incoherent light source and adaptive threshold | |
| CN106027151B (en) | A kind of regulated and controled with spectrum segmentation incoherent light source and adaptive threshold based on ultra-narrow communication device in WDM-PON systems | |
| Cheng et al. | 20Gb/s hybrid TDM/WDM PONs with 512-split using self-seeded reflective semiconductor optical amplifiers | |
| Cho et al. | Broadcast transmission in WDM-PON using a broadband light source | |
| Lee et al. | Enhancement of power budget in RSOA based loop-back type WDM-PON by using the cascaded RSOAs | |
| CN205754341U (en) | A kind of transmitting device of ultra-narrow band spectrum segmentation incoherent light source based on FFP wave filter and FFP-SOA in WDM-PON downlink communication system | |
| US8233808B2 (en) | Optical transmission system using four-wave mixing | |
| Lee et al. | A simple and color-free WDM-passive optical network using spectrum-sliced Fabry–Pérot laser diodes | |
| Chiuchiarelli et al. | Symmetric 10 Gbit/s WDM-PON based on cross-wavelength reuse to avoid Rayleigh backscattering and maximise band usage | |
| Rani et al. | Performance evaluation of high speed 320Gb/s bidirectional transmission for long reach DWDM-PON system | |
| Xu et al. | Wavelength sharing and reuse in dual-band WDM-PON systems employing WRC-FPLDs | |
| CN102449937A (en) | Light source for a wavelength division multiplexed optical communications capable of the high-speed transmission of an optical signal using an unpolarized light source, and wavelength division multiplexing passive optical network comprising same | |
| Bauwelinck et al. | Full-duplex 10 Gb/s transmission in ultra-dense PONs with tree splits> 1: 1k and noise-powered extender box |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |