CN105827320B - 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 - Google Patents
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 Download PDFInfo
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- CN105827320B CN105827320B CN201610308392.7A CN201610308392A CN105827320B CN 105827320 B CN105827320 B CN 105827320B CN 201610308392 A CN201610308392 A CN 201610308392A CN 105827320 B CN105827320 B CN 105827320B
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- incoherent light
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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
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
- H04B10/2513—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
Abstract
The invention discloses 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, including central station, Transmission Fibers, distant-end node and ONT Optical Network Terminal, the distant-end node is connect by Transmission Fibers with central station, the ONT Optical Network Terminal is connect with distant-end node, the central station includes sequentially connected wide range incoherent light source, FFP filters, FFP SOA, first order array waveguide grating, multiple optical modulators and second level array waveguide grating, the both ends of the multiple optical modulator are connect with first order array waveguide grating and second level array waveguide grating respectively.The compression of the spectrum carving incoherent light source intensity noise of multichannel may be implemented with spectrum segmentation incoherent light source for ultra-narrow after FFP SOA amplifications, effectively inhibits dispersive influence, is suitable for remote dense wave division multipurpose light passive network（DWDM‑PON）Communication system.
Description
Technical field
The invention belongs to field of communication technology, it is specifically a kind of in WDM-PON based on FFP filters and FFP-
Transmitting device of the ultra-narrow of SOA with spectrum segmentation incoherent light source.
Background technology
Passive optical network（PON）It is considered as the technology for solving the most critical of " last one kilometer " in access net, is realizing
It plays an important role in FTTX." passive " refers to Optical Distribution Node（ODN）In there is no any active device, only coupler,
The optical passive components such as Wavelength division multiplexer/demultiplexer, circulator form, and greatly reduce the cost of management service.
PON can be divided into power Splittable passive optical network by signal distribution（PSPON）With wavelength division multiplexing type passive optical network
（WDM-PON）.APON, BPON, EPON, GPON belong to PSPON.PSPON uses star coupler branch, uplink, downlink to pass
It send and uses TDMA/TDM modes, realize that channel width is shared, the signal that OLT is sent out is assigned to each optical-fiber network list by optical branching device
Member（Optical Network Unit, ONU）On.WDM-PON is then fully to use wavelength-division multiplex technique, passes through wavelength-division multiplex solution
Multiplexer（Such as array waveguide grating AWG）The signal light of different wave length is separated, each wavelength can individually modulate letter
Number, realize that the bandwidth in complete meaning exclusively enjoys.
Although PSPON is more mature, especially EPON, GPON have had fairly large deployment in North America, Japan,
PSPON still has critical issue and needs to solve, such as fast bit synchronization, Dynamic Bandwidth Allocation, baseline drift, the survey of ONU
Away from the design etc. with compensation of delay, burst mode optical transceiver module.Although some problems are resolved, cost is higher.And
WDM-PON then uses wavelength to be identified as user terminal, using wavelength-division multiplex technique, provides wider bandwidth of operation, realizes symmetrical wide
Band access.In addition to this it is possible to the ranging of ONU, fast bit is avoided in time division multiple access technology many technological difficulties such as to synchronize,
It has a clear superiority in system upgrade performance etc..
But with the increase of WDM-PON system access distances, the effect of dispersion of fibre-optical dispersion and Waveguide array can cause
The increase of error rate of system.It is now recognized that the method that can solve effect of dispersion better is Dispersion Compensation Fiber Gratings, lead to
It crosses and compensated optical fiber grating improvement dispersion characteristics is added in AWG.The essence of dispersion compensation is caused by the quadratic phase shift to frequency
Pulse broadening carry out compression compensation.
Invention content
In order to solve the above technical problems, the present invention provide it is a kind of in WDM-PON based on FFP filters and FFP-
Transmitting device of the ultra-narrow of SOA with spectrum segmentation incoherent light source, effective inhibition strength influence of noise are suitable for remote DWDM-
PON communication systems.
The present invention uses following technical scheme：It is a kind of for super based on FFP filters and FFP-SOA in WDM-PON
The transmitting device of narrowband spectrum segmentation incoherent light source, including central station（CO）, Transmission Fibers, distant-end node（RN）With optical-fiber network end
End（ONU）, the distant-end node connect by Transmission Fibers with central station, and the ONT Optical Network Terminal is connect with distant-end node, institute
It includes sequentially connected wide range incoherent light source, FFP filters for being incident on downlink signal to state central station（Fabry-Perot
Sieve filter）、FFP-SOA（Fabry-Perot semiconductor optical amplifier）, first order array waveguide grating（AWG1）, Duo Geguang
Modulator and second level array waveguide grating（AWG2）, the both ends of the multiple optical modulator respectively with first order Waveguide array light
Grid are connected with second level array waveguide grating, wherein FFP filters generate and defeated for cutting wide range incoherent light source signal
Going out multi-wavelength ultra-narrow band spectrum segmentation incoherent light source, FFP-SOA has low saturation power, needs to work in saturation operation region,
For the ultra-narrow band spectrum segmentation incoherent light source of nonlinear amplification different wave length, and it is more to utilize nonlinear amplification characteristic to compress simultaneously
Intensity noise of the wavelength ultra-narrow with spectrum segmentation incoherent light source, multiple optical modulators are suppressed for modulating the signal to noise
In the ultra-narrow band spectrum segmentation incoherent light source of each wavelength, 3-dB systems can be enhanced by polarization insensitive electric absorption optical modulator
System transmission performance.Wide range incoherent light source cutting is obtained into multi-wavelength ultra-narrow band spectrum using the FFP filters with ultra-narrow bandwidth
Cutting incoherent light source signal, the FFP-SOA in saturation operation region believe multi-wavelength ultra-narrow band spectrum segmentation incoherent light source
Number amplify and using nonlinear amplification characteristic compress multi-wavelength ultra-narrow with the intensity noise in spectrum segmentation incoherent light source, Zhi Houtong
Cross first order array waveguide grating（AWG1）Different lightwave length of the ultra-narrow with spectrum segmentation incoherent light source is distributed to correspond to accordingly
In wavelength channel, and each circuit-switched data information of load is modulated, then passes through second level array waveguide grating（AWG2）Realize wavelength-division multiplex,
Then it is transmitted from Transmission Fibers to distant-end node RN, wavelength-division demultiplexing is realized in distant-end node, finally by data distribution to light net
Network terminal ONU.ONT Optical Network Terminal realizes the transmission of the demodulation upstream data of downlink data.
The distant-end node includes third level array waveguide grating（AWG3）Or film filter, connected by Transmission Fibers
It is connected to central station, the optical signal sent out from central station CO is output to distributed optical communication after AWG3 wavelength-divisions demultiplexing
Circuit.
The ONT Optical Network Terminal includes the multiple optical receivers being connect with distant-end node.Optical receiver and third DeMux
Device/wavelength division multiplexer（Such as AWG3）It is connected.The optical receiver includes photodiode, the first bandpass filter and decoding
Device.
The wide range incoherent light source passes through high power erbium-doped fiber amplifier, light emitting diode, two pole of superradiation light-emitting
Pipe or fabry-Perot laser diode spectroscopic light source are realized.
The channel spacing of the FFP filters and FFP-SOA need the communication channel interval one all with WDM-PON systems
It causes.
The FFP-SOA works in saturation operation region, reaches pressure using the nonlinear amplification characteristic of saturation operation region
The purpose of intensity noise in contracting light source.
The temperature of the FFP filters and FFP-SOA are controlled by TEC.
The multiple optical modulator uses the on-off keying modulation system for having preferable resistance to intensity noise.
Preposition Error Correction of Coding is equipped with before the optical modulator, ONT Optical Network Terminal enhances system equipped with preposition error correction decoding
Noise resistance.
FFP filters in the present invention（Fabry-perot filter）It is a kind of super narrow band filter, can also uses
Gaussian filter or fiber grating filter with Lorentz lorentz's shape.
In the present invention can transmitting terminal use preposition Error Correction of Coding, and the self feed back threshold value decision circuit of receiving terminal it
Enhance the noise resistance of system using preposition error correction decoding afterwards.
It is an advantage of the invention that：The ultra-narrow band spectrum segmentation incoherent light source of the present invention is using FFP filters to mixing bait light
The wide range amplified spontaneous emission source that fiber amplifier (Erbium Doped Fiber Amplifier, EDFA) generates
(Amplified Spontaneous Emission, ASE) is filtered, and amplifies to obtain by FFP-SOA, and line width is small
In 700MHz, the spectrum segmentation that multichannel may be implemented with spectrum segmentation incoherent light source for the ultra-narrow after amplifying by FFP-SOA is non-
The compression of coherent source intensity noise, effectively inhibits dispersive influence, is suitable for remote dense wave division multipurpose light passive network
（DWDM-PON）Communication system.
Description of the drawings
Fig. 1 is WDM-PON view of the ultra-narrow based on FFP filters and FFP-SOA with spectrum segmentation incoherent light source；
Fig. 2 is relatively strong before and after passing through FFP-SOA with spectrum segmentation light source using ultra-narrow in WDM-PON systems
Spend noise pattern；
Fig. 3 is to utilize the schematic diagram for being operated in intensity noise in the FFP-SOA compression light sources of saturation operation region；
Fig. 4 is to transmit 25- positioned at 1542nm wavelength channels using in the WDM-PON systems of FFP filters and FFP-SOA
The relational graph of the bit error rate and transmission range of Gb/s OOK signals；
Fig. 5 be WDM-PON system of the ultra-narrow based on FFP filters and FFP-SOA with spectrum segmentation incoherent light source in,
The bit error rate performance in different wave length channel in back-to-back system (CCC-0).
Specific implementation mode
In order to deepen the understanding of the present invention, the present invention is described in further detail below in conjunction with embodiment and attached drawing,
The embodiment is only for explaining the present invention, does not restrict the protection scope of the present invention.
As shown in Figure 1, it is a kind of in WDM-PON based on the ultra-narrow of FFP filters and FFP-SOA the band non-phase of spectrum segmentation
The transmitting device of dry light source, including central station（CO）, Transmission Fibers（Select single mode optical fiber）, distant-end node（RN）With optical-fiber network end
End（ONU）, distant-end node connect by Transmission Fibers with central station, and ONT Optical Network Terminal is connect with distant-end node.
Central station includes the wide range incoherent light source BLS for being incident on downlink signal, and Gao Gong is had chosen in the present embodiment
Rate erbium-doped fiber amplifier is come the spontaneous amplification divergent light source that generates；Super narrow-band bandpass light for cutting wide range incoherent light source
Filter has chosen FFP filters in the present embodiment（Fabry-perot filter）；For by the ultra-narrow band spectrum of different wave length
Cutting incoherent light source signal nonlinear amplification simultaneously utilizes intensity noise in nonlinear amplification characteristic compression light sources with different wavelengths
FFP-SOA（Fabry-Perot semiconductor optical amplifier）；Different wave length ultra-narrow band spectrum segmentation incoherent light source is separated to correspondence
The first multichannel separation coupling device in channel selects first order array waveguide grating in the present embodiment（AWG1）；Multiple light modulations
Device, the ultra-narrow band spectrum segmentation incoherent light source for modulating the signal to the suppressed each wavelength of noise, can pass through polarization
Insensitive electric absorption optical modulator enhances Signal-to-Noise, enhances 3-dB system transmission performances, signal carries out before light modulation
Preposition Error Correction of Coding is first passed through；With the second wavelength division multiplexer for coupling multichannel downlink signal, second is selected in the present embodiment
Grade array waveguide grating（AWG2）.Wherein, the channel spacing of FFP filters and FFP-SOA should be logical with WDM-PON systems
Believe that channel spacing is consistent, FFP-SOA needs to be operated in saturation operation region, and needs very wide operating wavelength range, real
Now the intensity noise of all WDM-PON systems light sources with different wavelengths is inhibited simultaneously, the different wave length that FFP filter cuttings obtain
Ultra-narrow band spectrum segmentation incoherent light source signal there is prodigious intensity noise in low frequency range, maximum close to DC area noise,
And it is inversely proportional with the line width of light source（The line width of relative noise intensity=1/ surpass narrow band spectrum cutting incoherent light source）.
Distant-end node includes third wavelength division multiplexer/demultiplexer for wavelength-division multiplex/multichannel separation, passes through transmission
Optical fiber is connected to central station；Third level array waveguide grating is selected in the present embodiment（AWG3）, sent out from central station CO light letter
Number by AWG3 wavelength-divisions demultiplexing after, be output to distributed optical communication link.
ONT Optical Network Terminal includes the multiple optical receivers being connect with distant-end node.Optical receiver and third wavelength division multiplexer/
Demultiplexer is connected, and AWG3 is chosen in the present embodiment.Optical receiver includes photodiode, the reconciliation of the first bandpass filter
Code device.
As shown in Fig. 2, compare in WDM-PON systems using ultra-narrow band spectrum segmentation light source by before FFP-SOA and it
Relative intensity noise spectrogram afterwards.Wave spectrum cutting incoherent light source of the ultra-narrow with 700-MHz line widths is then concentrated mainly on low frequency
Region.Intensity noise can be effectively reduced using the FFP-SOA for being operated in zone of saturation, and relative intensity noise is from -90dB/
Hz is reduced to -118dB/Hz（The range of nearly direct current）.
As shown in figure 3, compressing the principle of the intensity noise in light source using the FFP-SOA for being operated in zone of saturation：Work
FFP-SOA in zone of saturation has the characteristics that nonlinear amplification, the i.e. amplification factor of low-power input signal are much larger than high power
The amplification factor of input signal can compress the intensity noise in light source using this characteristic, obtain the light that relative intensity is stablized
Source signal.
As shown in figure 4, in WDM-PON systems, when being located at the channel transfer 25Gb/s signals of 1542nm, put using saturated light
After intensity noise in big device compression light source, the bit error rate of signal and the relationship of signal transmission distance.
As shown in figure 5, in WDM-PON systems, in back-to-back transmission, different wave length channel transfer 25Gb/s OOK signals
The bit error rate（Preposition error correction decoding is not used）.
Claims (5)
1. a kind of transmission of the ultra-narrow based on FFP filters and FFP-SOA with spectrum segmentation incoherent light source in WDM-PON
Device, which is characterized in that including central station, Transmission Fibers, distant-end node and ONT Optical Network Terminal, the distant-end node passes through transmission
Optical fiber is connect with central station, and the ONT Optical Network Terminal is connect with distant-end node；The central station includes that sequentially connected wide range is non-
Coherent source, FFP filters, FFP-SOA, first order array waveguide grating, multiple optical modulators and second level Waveguide array light
Grid, the wide range incoherent light source pass through high power erbium-doped fiber amplifier, light emitting diode, super-radiance light emitting diode or method
Fabry-Perot-type laser diode spectrum light source is realized；The temperature of the FFP filters and FFP-SOA are controlled by TEC；Institute
It states multiple optical modulators and uses the on-off keying modulation system resistant to intensity noise, the both ends point of the multiple optical modulator
It is not connect with first order array waveguide grating and second level array waveguide grating, using FFP filters by wide range incoherent light source
Cutting obtains multi-wavelength ultra-narrow band spectrum segmentation incoherent light source, is compressed followed by the FFP-SOA for working in saturation state more
Intensity noise of the wavelength ultra-narrow with spectrum segmentation incoherent light source by first order array waveguide grating branch and loads each road later
Data information, then wavelength-division multiplex is realized by second level array waveguide grating, then transmitted from Transmission Fibers to distant-end node,
Distant-end node realizes wavelength-division demultiplexing, finally by data distribution to ONT Optical Network Terminal；The distant-end node includes third level array
Waveguide optical grating or film filter.
2. a kind of ultra-narrow band spectrum based on FFP filters and FFP-SOA in WDM-PON according to claim 1
The transmitting device of cutting incoherent light source, which is characterized in that the ONT Optical Network Terminal includes the multiple light being connect with distant-end node
Receiver.
3. a kind of ultra-narrow band spectrum based on FFP filters and FFP-SOA in WDM-PON according to claim 2
The transmitting device of cutting incoherent light source, which is characterized in that the optical receiver includes photodiode, the first bandpass filter
And decoder.
4. a kind of ultra-narrow band spectrum based on FFP filters and FFP-SOA in WDM-PON according to claim 1
The transmitting device of cutting incoherent light source, which is characterized in that the channel spacing of the FFP filters and FFP-SOA need all and
The communication channel interval of WDM-PON systems is consistent.
5. a kind of ultra-narrow band spectrum based on FFP filters and FFP-SOA in WDM-PON according to claim 1
The transmitting device of cutting incoherent light source, which is characterized in that preposition Error Correction of Coding, ONT Optical Network Terminal are equipped with before the optical modulator
Equipped with preposition error correction decoding.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610308392.7A CN105827320B (en) | 2016-05-11 | 2016-05-11 | 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 |
| PCT/CN2016/113709 WO2017193601A1 (en) | 2016-05-11 | 2016-12-30 | Transmission apparatus for ultra-narrow band spectrum segmentation incoherent light source based on ffp filter and ffp-soa in wdm-pon |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610308392.7A CN105827320B (en) | 2016-05-11 | 2016-05-11 | 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 |
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| CN106027151B (en) * | 2016-05-11 | 2018-09-14 | 中天宽带技术有限公司 | 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 |
| CN105827320B (en) * | 2016-05-11 | 2018-07-27 | 中天宽带技术有限公司 | 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 |
| EP3316497B1 (en) * | 2016-10-26 | 2019-10-16 | STMicroelectronics (Research & Development) Limited | A single photon avalanche diode module for communications |
| CN106656334B (en) * | 2017-01-12 | 2023-06-02 | 中天宽带技术有限公司 | Long-distance passive optical network system based on coherent optical orthogonal frequency division multiplexing and method thereof |
| CN109752032B (en) * | 2019-01-30 | 2020-10-30 | 重庆理工大学 | Light intensity-based fiber bragg grating demodulation system and method and structural damage monitoring system |
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| WO2017193601A1 (en) | 2017-11-16 |
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